IRIDIUM WORLD COMMUNICATIONS LTD
S-1/A, 1997-04-21
RADIOTELEPHONE COMMUNICATIONS
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 18, 1997
    
   
                                                      REGISTRATION NO. 333-23419
    
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ---------------------
 
   
                                AMENDMENT NO. 1
    
   
                                       to
    
                                    FORM S-1
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
 
                       IRIDIUM WORLD COMMUNICATIONS LTD.
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                            <C>                            <C>
            BERMUDA                         4812                       [APPLIED FOR]
 (State or other jurisdiction   (Primary Standard Industrial         (I.R.S. Employer
      of incorporation or        Classification Code Number)        Identification No.)
         organization)
</TABLE>
 
                             ---------------------
 
           CLARENDON HOUSE, 2 CHURCH STREET, HAMILTON HM 11, BERMUDA
                                 (441) 295-5950
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                             ---------------------
 
                             F. THOMAS TUTTLE, ESQ.
 IRIDIUM WORLD COMMUNICATIONS LTD., 1401 H STREET, N.W., WASHINGTON, D.C. 20005
                                 (202) 326-5600
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                             ---------------------
 
                                with copies to:
 
<TABLE>
<S>                                           <C>
              JOHN P. MEAD, ESQ.                        TIMOTHY E. PETERSON, ESQ.
             SULLIVAN & CROMWELL                          FRIED, FRANK, HARRIS,
               125 BROAD STREET                             SHRIVER & JACOBSON
           NEW YORK, NEW YORK 10004                         ONE NEW YORK PLAZA
                (212) 558-4000                           NEW YORK, NEW YORK 10004
                                                              (212) 859-8000
</TABLE>
 
                             ---------------------
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended, check the following box. [ ]
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ]
     If this form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
     If delivery of this prospectus is expected to be made pursuant to Rule 434,
please check the following box. [X]
                             ---------------------
 
   
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THIS REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION,
ACTING PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.
    
================================================================================
<PAGE>   2
 
   
                                EXPLANATORY NOTE
    
 
   
     This Amendment No. 1 is being filed to provide additional exhibits required
by Item 16. All information previously filed, including the Prospectus and
exhibits included pursuant to Item 16, are incorporated herein by reference.
    
<PAGE>   3
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION(S)
 
     The following are the estimated expenses in connection with the
distribution of the securities being registered:
 
<TABLE>
    <S>                                                                          <C>
    Securities and Exchange Commission Registration Fee........................  $73,182
    NASD Filing Fee............................................................   24,650
    Printing and Engraving Expenses............................................     *
    Accounting Fees and Expenses...............................................     *
    Attorneys' Fees and Expenses...............................................     *
    Transfer Agent's and Registrar's Fees......................................     *
    Blue Sky Fees and Expenses (including attorneys' fees).....................     *
    NASDAQ Listing Fees........................................................   50,000
    Miscellaneous..............................................................     *
                                                                                 -------
              Total............................................................  $
                                                                                 =======
</TABLE>
 
- ---------------
 
* To be supplied by amendment.
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Bermuda law permits a company to indemnify its directors and officers,
except for any act of dishonesty. The Company has provided in its Bye-Laws that
the directors and officers of the Company will be indemnified and secured
harmless to the full extent permitted by law out of the assets of the Company
from and against all actions, costs, charges, losses, damages and expenses
incurred by reason of any act done, concurred in or omitted in or about the
execution of their duties or supposed duties, other than in the case of any
fraud or dishonesty. In addition, the Company has provided in its Bye-Laws that
each shareholder of the Company agrees to waive any claim or right of action,
individually or in the right of the Company, against any director or officer of
the Company on account of any action taken by such director or officer, or the
failure of such director or officer to take any action, in the performance of
his duties with or for the Company, other than with respect to any matter
involving any fraud or dishonesty on behalf of such director or officer.
 
     Bermuda law also permits the Company to purchase insurance for the benefit
of its directors and officers against any liability incurred by them for the
failure to exercise the requisite care, diligence and skill in the exercise of
their powers and the discharge of their duties, or indemnifying them in respect
of any loss arising or liability incurred by them by reason of negligence,
default, breach of duty or breach of trust.
 
     In the 1997 Share Issuance Agreement, Iridium has agreed to indemnify the
Company and each of its officers, directors and employees against any loss,
claims, damages or liabilities to which the Company or such officers, directors
or employees may become subject except to the extent that any such loss, damage
or liability arises out of or is based upon an intentional act or omission of an
indemnified party which was contrary to any written instruction or request of
Iridium or which amounted to a willful misconduct on the part of any officer,
director, employee or agent of the Company who is not also a full time employee
of Iridium.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
     None.
 
                                      II-1
<PAGE>   4
 
ITEM 16. EXHIBIT AND FINANCIAL STATEMENT SCHEDULES
 
     (a) Exhibits
 
   
<TABLE>
<CAPTION>
      EXHIBIT
       NUMBER                            DESCRIPTION OF EXHIBIT                        PAGE
- -------------------- --------------------------------------------------------------------------
<C>                  <S>                                                            <C>
         1.1         -- Form of U.S. Underwriting Agreement.***
         1.2         -- Form of International Underwriting Agreement.***
         3.1         -- Memorandum of Association of Iridium World Communications
                        Ltd.**
         3.2         -- Bye-Laws of Iridium World Communications Ltd.**
         4.1         -- Form of Class A Common Stock Certificate.***
         5.1         -- Opinion of Conyers Dill & Pearman.***
        10.1         -- Limited Liability Company Agreement of Iridium LLC, dated as
                        of July 29, 1996, as amended.**
        10.2         -- Interest Exchange Agreement, among the Company, Iridium LLC
                        and the holders from time to time of Class 1 Membership
                        Interests of Iridium LLC.***
        10.3         -- Management Services Agreement between the Company and
                        Iridium LLC.***
        10.4         -- 1997 Subscription Agreement between the Company and Iridium
                        LLC.***
        10.5         -- Iridium Option Plan.***
        10.6         -- Space System Contract between Iridium LLC and Motorola, Inc.
                        effective July 29, 1993, as amended and conformed on January
                        14, 1997.+
        10.7         -- Communications System Operations & Maintenance Contract
                        between Iridium LLC and Motorola, Inc. effective July 29,
                        1993, as amended and conformed on January 14, 1997.+
        10.8         -- Terrestrial Network Development Contract between Iridium LLC
                        and Motorola, Inc. effective January 1, 1993, as amended and
                        conformed on January 14, 1997.+
        10.9         -- Support Agreement between Iridium and Motorola.*
        10.10        -- Agreement, dated           between Anderson Consulting, LLP
                        and Iridium relating to the development of business support
                        systems.***
        10.11        -- 14 1/2% Senior Subordinated Discount Notes Due 2006 of
                        Iridium (contained in Exhibit 10.1).**
        10.12        -- Form of Warrant issued in respect of 14 1/2% Senior
                        Subordinated Discount Notes (contained in Exhibit 10.1).**
        10.13        -- Warrant to purchase Series M Class 2 Interests dated July
                        29, 1993, as amended (contained in Exhibit 10.1).**
        10.14        -- Form of Gateway Authorization Agreement.*
        10.15        -- Guaranteed Bank Facility.*
        10.16        -- Motorola Agreement regarding Guarantee.*
        10.17        -- Share Issuance Agreement between the Company and Iridium
                        LLC.***
        11.1         -- Statement re Computation of Per Share Earnings**
        23.1         -- Consent of KPMG Peat Marwick LLP.*
        23.2         -- Consent of Conyers Dill & Pearman (contained in Exhibit
                        5.1).***
        24.1         -- Power of Attorney.***
        27.1         -- Financial Data Schedule**
</TABLE>
    
 
- ---------------
  * Filed herewith.
   
 ** Previously filed.
    
   
*** To be filed by Amendment.
    
   
  + Confidential treatment requested.
    
 
                                      II-2
<PAGE>   5
 
ITEM 17. UNDERTAKINGS
 
     The undersigned Registrant hereby undertakes to provide to the underwriters
at the closing specified in the Underwriting Agreements, certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the Registrant of expenses incurred
or paid by a director, officer or controlling person of the Registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
     The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities Act
     of 1933, the information omitted from the form of prospectus filed as part
     of this Registration Statement in reliance upon Rule 430A and contained in
     a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For purposes of determining any liability under the Securities Act
     of 1933, each post-effective amendment that contains a form of prospectus
     shall be deemed to be a new registration statement relating to the
     securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.
 
                                      II-3
<PAGE>   6
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant has duly caused this Amendment No. 1 to the Registration Statement to
be signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Washington, D.C., on April 18, 1997.
    
 
                                          IRIDIUM WORLD COMMUNICATIONS LTD.
 
   
                                          By:      /s/ EDWARD F. STAIANO
    
                                            ------------------------------------
   
                                            Name: Edward F. Staiano
    
   
                                            Title: Chief Executive Officer
    
 
   
     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Amendment No. 1 to the Registration Statement has been signed by the
following persons in the capacities on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
                    NAME                                  TITLE                     DATE
- ---------------------------------------------  ----------------------------  ------------------
<C>                                            <S>                           <C>
 
            /s/ EDWARD F. STAIANO              Chief Executive Officer and     April 15, 1997
- ---------------------------------------------    Director
              Edward F. Staiano
 
                /s/ ROY GRANT                  Chief Financial Officer and     April 18, 1997
- ---------------------------------------------    Chief Accounting Officer
                  Roy Grant
 
            /s/ JOHN F. MITCHELL               Chairman and Director           April 17, 1997
- ---------------------------------------------
              John F. Mitchell
 
              /s/ ALBERTO FINOL                Deputy Chairman and Director    April 16, 1997
- ---------------------------------------------
                Alberto Finol
 
                                               Director
- ---------------------------------------------
                  Ulf Bohla
 
               /s/ EDWARD GAMS                 Director                        April 18, 1997
- ---------------------------------------------
                 Edward Gams
 
            /s/ ROBERT W. KINZIE               Director                        April 18, 1997
- ---------------------------------------------
              Robert W. Kinzie
 
            /s/ YOSHIHARU YASUDA               Director                        April 16, 1997
- ---------------------------------------------
              Yoshiharu Yasuda
 
                /s/ ROY GRANT                  Authorized Representative in    April 18, 1997
- ---------------------------------------------    the United States
                  Roy Grant
</TABLE>
    
 
                                      II-4
<PAGE>   7
 
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                            DESCRIPTION OF EXHIBIT                            PAGE
- ---------- -----------------------------------------------------------------------------------
<C>        <S>                                                                     <C>
    1.1    -- Form of U.S. Underwriting Agreement.***
    1.2    -- Form of International Underwriting Agreement.***
    3.1    -- Memorandum of Association of Iridium World Communications Ltd.**
    3.2    -- Bye-Laws of Iridium World Communications Ltd.**
    4.1    -- Form of Class A Common Stock Certificate.***
    5.1    -- Opinion of Conyers Dill & Pearman. ***
   10.1    -- Limited Liability Company Agreement of Iridium LLC, dated as of July
              29, 1996, as amended.**
   10.2    -- Interest Exchange Agreement, among the Company, Iridium LLC and the
              holders from time to time of Class 1 Membership Interests of Iridium
              LLC.***
   10.3    -- Management Services Agreement between the Company and Iridium LLC.***
   10.4    -- 1997 Subscription Agreement between the Company and Iridium LLC.***
   10.5    -- Iridium Option Plan.***
   10.6    -- Space System Contract between Iridium LLC and Motorola, Inc.
              effective July 29, 1993, as amended and conformed on January 14,
              1997.+
   10.7    -- Communications System Operations & Maintenance Contract between
              Iridium LLC and Motorola, Inc. effective July 29, 1993, as amended
              and conformed on January 14, 1997.+
   10.8    -- Terrestrial Network Development Contract between Iridium LLC and
              Motorola, Inc. effective January 1, 1993, as amended and conformed on
              January 14, 1997.+
   10.9    -- Support Agreement between Iridium and Motorola.*
   10.10   -- Agreement, dated             between Anderson Consulting, LLP and
              Iridium relating to the development of business support systems.***
   10.11   -- 14 1/2% Senior Subordinated Discount Notes Due 2006 of Iridium
              (contained in Exhibit 10.1).**
   10.12   -- Form of Warrant issued in respect of 14 1/2% Senior Subordinated
              Discount Notes (contained in Exhibit 10.1).**
   10.13   -- Warrant to purchase Series M Class 2 Interests dated July 29, 1993,
              as amended (contained in Exhibit 10.1).**
   10.14   -- Form of Gateway Authorization Agreement.*
   10.15   -- Guaranteed Bank Facility.*
   10.16   -- Motorola Agreement regarding Guarantee.*
   10.17   -- Share Issuance Agreement between the Company and Iridium LLC.***
   11.1    -- Statement re Computation of Per Share Earnings.**
   23.1    -- Consent of KPMG Peat Marwick LLP.*
   23.2    -- Consent of Conyers Dill & Pearman (contained in Exhibit 5.1).***
   24.1    -- Power of Attorney.***
   27.1    -- Financial Data Schedule**
</TABLE>
    
 
- ---------------
  * Filed herewith.
 ** Previously filed.
   
*** To be filed by Amendment.
    
  + Confidential treatment requested.

<PAGE>   1
                                                                    EXHIBIT 10.6

                                   IRIDIUM(R)

                                  SPACE SYSTEM

                                    CONTRACT


                                    Between


                                  IRIDIUM LLC
                                      and
                                    MOTOROLA





CONTRACT EFFECTIVE DATE:  JULY 29, 1993
(CONFORMED 01/14/97 TO INCLUDE AMENDMENTS 1, 2, 3, 4, 5 AND 6
REQUESTS FOR CHANGE RFC-001, RFC-002 AND RFC-004)





- ---------------
IRIDIUM IS A REGISTERED TRADEMARK AND SERVICE MARK OF IRIDIUM LLC.
<PAGE>   2
IRIDIUM Space System Contract

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
TITLE                                                                                           PAGE
- -----                                                                                           ----
<S>              <C>                                                                              <C>
RECITALS          . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    1
ARTICLE 1.       DEFINITIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    2
ARTICLE 2.       DESCRIPTION OF WORK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    4
ARTICLE 3.       MILESTONE PERFORMANCE SCHEDULE . . . . . . . . . . . . . . . . . . . . . . . .    5
ARTICLE 4.       PRICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    5
ARTICLE 5.       PAYMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    7
ARTICLE 6.       GATEWAY DELIVERY COMMITMENT  . . . . . . . . . . . . . . . . . . . . . . . . .    8
ARTICLE 7.       OPERATION OF SYSTEM CONTROL SEGMENT FACILITIES . . . . . . . . . . . . . . . .   10
ARTICLE 8.       ACCEPTANCE CRITERIA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   11
ARTICLE 9.       TITLE TRANSFER.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   12
ARTICLE 10.      CHANGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   13
ARTICLE 11.      EXCUSABLE DELAYS.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   13
ARTICLE 12.      BUYER'S ACCESS.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   14
ARTICLE 13.      PROGRESS MEETINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   14
ARTICLE 14.      INTELLECTUAL PROPERTY RIGHTS.  . . . . . . . . . . . . . . . . . . . . . . . .   15
ARTICLE 15.      PATENT INDEMNITY.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   17
ARTICLE 16.      WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   19
ARTICLE 17.      TAXES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   19
ARTICLE 18.      PERMITS AND LICENSES.  . . . . . . . . . . . . . . . . . . . . . . . . . . . .   20
ARTICLE 19.      CROSS WAIVER OF LIABILITY. . . . . . . . . . . . . . . . . . . . . . . . . . .   22
ARTICLE 20.      INDEMNIFICATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   23
ARTICLE 21.      INSURANCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   23
ARTICLE 22.      EXPORT REGULATIONS.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   24
ARTICLE 23.      DEFAULT BY SELLER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   24
ARTICLE 24.      DEFAULT BY BUYER.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   25
ARTICLE 25.      TERMINATION FOR CONVENIENCE. . . . . . . . . . . . . . . . . . . . . . . . . .   26
ARTICLE 26.      LIMITATION OF LIABILITY. . . . . . . . . . . . . . . . . . . . . . . . . . . .   27
ARTICLE 27.      DISCLOSURE AND USE OF INFORMATION BY THE PARTIES.  . . . . . . . . . . . . . .   28
ARTICLE 28.      PUBLIC RELEASE OF INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . .   28
ARTICLE 29.      ASSIGNMENT.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   29
ARTICLE 30.      RELATIONSHIP WITH OTHER AGREEMENTS.  . . . . . . . . . . . . . . . . . . . . .   29
ARTICLE 31.      SALES OF OTHER SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . .   30
ARTICLE 32.      NOTICES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   30
ARTICLE 33.      AUTHORIZED REPRESENTATIVES.  . . . . . . . . . . . . . . . . . . . . . . . . .   30
ARTICLE 34.      EXHIBITS.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   31
ARTICLE 35.      ORDER OF PRECEDENCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   31
ARTICLE 36.      APPLICABLE LAW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   31
ARTICLE 37.      ENTIRE AGREEMENT.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   32
ARTICLE 38.      EFFECTIVE DATE.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   33
</TABLE>


                                    Page i
<PAGE>   3
IRIDIUM Space System Contract

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
TITLE                                                                                           PAGE
- -----                                                                                           ----
<S>              <C>                                                                              <C>
EXHIBIT A         . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   34
EXHIBIT B.       STATEMENT OF WORK
EXHIBIT C.       ACCEPTANCE PLAN
</TABLE>


                                   Page ii
<PAGE>   4
IRIDIUM Space System Contract

                        IRIDIUM SPACE SYSTEM CONTRACT


THIS CONTRACT is hereby made between Motorola, Inc. (hereinafter called
"Seller") a corporation organized under the laws of the State of Delaware,
U.S.A., and Iridium LLC (hereinafter called "Buyer"), a Delaware limited
liability company.  The Effective Date of this Contract is the date specified
in ARTICLE 38, EFFECTIVE DATE.

                                   RECITALS
A.       On June 26, 1990, Motorola formally announced that it intended to
         develop a global communication system that would allow communication
         via portable radio telephones -- whether on land, at sea or in the
         air.  The new system, known as IRIDIUM, has at the heart of its
         operation, a Constellation of nominally sixty-six (66) satellites in
         low-earth orbit working together as a digitally-switched
         communications network in space.  The system is intended to handle
         both voice and data.  One or more ground-based spacecraft control
         facilities will maintain the satellite Constellation and overall
         operation of the system.

B.       A key component of the IRIDIUM Communications System will be a network
         of "gateway" surface facilities in various countries that will link
         the satellites with the public-switched telephone network.  These
         gateways will also store customer billing information and will keep
         track of each user's location.

C.       Other key components to the system are the Subscriber Units (ISUs) and
         Mobile Exchange Units (MXUs).

D.       On June 14, 1991 Motorola incorporated Iridium, Inc. to become, among
         other things, the owner of the Space System portion of the IRIDIUM
         Communications System.

E.       This Contract is intended to function as the mechanism whereby
         Motorola will sell to Iridium LLC the Space System portion of the
         IRIDIUM Communications System.

F.       Separate agreements between Motorola and other appropriate parties
         will provide for the production and sale of the Gateways, Subscriber
         Units, MXUs, and other components of the IRIDIUM Communications
         System.  Motorola intends to develop or have others develop these
         components by the time the system is operational.  A separate
         agreement between Iridium LLC and Motorola, Inc. shall provide for the
         operation and maintenance of the Space System upon completion of this
         Contract.


                                    Page 1
<PAGE>   5
IRIDIUM Space System Contract

                            ARTICLE 1. DEFINITIONS.

Capitalized terms used and not otherwise defined herein shall have the
following meanings:

A.       Constellation or Space Segment:  That part of the complete IRIDIUM
         Communications System consisting solely of the space vehicles (also
         referred to as spacecrafts or satellites) in low-earth orbit and
         providing a 98.5% global coverage as specified in TABLE 3.7.1 of the
         Statement of Work.  It does not include the System Control Segment,
         Gateways, ISUs, MXUs or other components necessary for complete
         utilization of the IRIDIUM Communications System.

B.       Gateway:  The Gateways encompass the ground-based facilities
         constructed in accordance with the Gateway Interface Specification
         supporting the subscriber billing/information functions in addition to
         call processing operations and the connection of the IRIDIUM
         subscriber communications through the Public Switched Telephone
         Network (PSTN).

C.       Gateway Interface Specification:  The functional specification
         prepared by Seller that defines the radio frequency interface, logical
         and physical protocols, and functionality necessary for Gateway
         interoperability with the Space System.  It does not include the Voice
         Encoding Algorithm necessary for complete interoperability with the
         IRIDIUM Communications System.

D.       Initial Operating Period:  The Initial Operating Period shall commence
         immediately after arrival of the first space vehicle at its designated
         orbital position, and conclude when Seller demonstrates to Buyer
         completion of the Space System, (i.e.  completion of Milestone 47).

E.       IRIDIUM Communications System (or simply "IRIDIUM"):  The complete
         integrated satellite-based digitally-switched communication system.
         This term refers collectively to the Space Segment, System Control
         Segment, Gateways and Subscriber Unit Segment.

F.       Mobile Exchange Units (MXUs):  The equipment designed to interconnect
         multiple voice or data channels to the IRIDIUM Communications System
         using the subscriber unit radio frequency interface to the Space
         System.

G.       Mobile Exchange Unit (MXU) Interface Specification:  The functional
         specification prepared by Seller that defines the radio frequency
         interface, logical and physical protocols necessary for Mobile
         Exchange Unit (MXU) interoperability with the Space System.  It does
         not include the Voice Encoding Algorithm necessary for complete
         interoperability with the IRIDIUM Communications System.





                                     Page 2
<PAGE>   6
IRIDIUM Space System Contract


H.       Paging Unit Interface Specification:  The functional specification
         prepared by Seller that defines the radio frequency interface, logical
         and physical protocols and paging unit functionality necessary for
         paging unit interoperability with the Space System.

I.       Revenue Producing Communication Message:  As used within this
         Contract, this phrase means:  A message transmitted other than by
         Seller through the Space System or any portion thereof entitling Buyer
         to revenue.

J.       Satellite Communication Link Interface Specification:  The functional
         specification prepared by Seller that defines the radio frequency
         interface, logical and physical protocols and satellite functionality
         necessary for satellite-to-satellite and satellite-to-system control
         segment interoperability.

K.       Satellite Subscriber Unit (Voice) Interface Specification:  The
         functional specification prepared by Seller that defines the radio
         frequency interface, logical, and physical protocols necessary for
         subscriber unit (voice, data, facsimile) interoperability with the
         Space System.  It does not include the Voice Encoding Algorithm
         necessary for complete interoperability with the IRIDIUM Communication
         System.

L.       Space System Operations Plan:  Documentation prepared by Seller which
         details the operation of the Space System and the actions required to
         retain its performance characteristics at the levels provided in the
         Statement of Work.  It also describes the operations of the entire
         IRIDIUM Communications System.

M.       Space System:  This term refers to the integrated combination of the
         Space Segment and System Control Segment.

N.       Space Vehicles:  The terms space vehicle, satellite, or spacecraft all
         have the same meaning throughout this Contract and refer to the
         individual or multiple satellites of the Constellation.

O.       Subscriber Unit Segment:  The Subscriber Unit Segment refers
         collectively to the individual equipment units to be used by
         subscribers and capable of initiating and receiving communications
         through the IRIDIUM Communications System.  These may include for
         example hand-held portable units, aircraft units, marine units,
         portable office units, and pay phone units.  As used herein, this term
         also includes paging units.

P.       System Control Segment (SCS):  This term refers to the various
         ground-based sites, equipment, and facilities to manage and control
         the individual space vehicles of the Constellation, and the
         communication links of the IRIDIUM Communications System in accordance
         with the performance levels specified in the Statement of Work,
         Exhibit B.  The System Control Segment is composed of a Master Control
         Facility (MCF), and Backup Control Facility (BCF), and associated
         Telemetry, Tracking and Command Facilities (TTAC's).





                                     Page 3
<PAGE>   7
IRIDIUM Space System Contract

Q.       Voice Encoding Algorithm:  As this term is used in this Contract it
         refers to the algorithm used to encode and decode analog voice to and
         from compressed digital speech.

                        ARTICLE 2.  DESCRIPTION OF WORK.

A.       Seller shall design, develop, produce, and deliver in accordance with
         the provisions of this Contract, (including all Exhibits) the
         integrated Space System of the IRIDIUM Communication System consisting
         of the Constellation and the System Control Segment.  Seller shall
         also deliver the Satellite Subscriber Unit (Voice) Interface
         Specification and the Space System Operations Plan.  The Satellite
         Subscriber Unit (Voice) Interface Specification will be made available
         by Seller and Buyer to the public after Milestone Number 37 is
         completed.

B.       Seller shall deliver the Gateway Interface Specification.  Seller
         agrees to develop and sell Gateways to third parties and to license to
         responsible and competent suppliers acceptable to Seller, the rights
         to use the information in the Gateway Interface Specification and the
         Voice Encoding Algorithm to the extent essential to manufacture and
         sell IRIDIUM Gateways, all pursuant to reasonable terms and conditions
         mutually acceptable to Seller and such third parties.  Seller also
         agrees to license to responsible and competent suppliers named by
         Buyer, the right to use the information in the Gateway Interface
         Specification and Voice Encoding Algorithm to the extent essential to
         manufacture and sell IRIDIUM Gateways solely for the next generation
         IRIDIUM Communication System, pursuant to reasonable terms and
         conditions mutually acceptable to Seller and such suppliers.

C.       Seller shall deliver, the Paging Unit Interface Specification.  Seller
         agrees to develop and sell paging units to third parties and to
         license to responsible and competent suppliers acceptable to Seller
         the rights to use the information in the Paging Unit Interface
         Specification to the extent essential to manufacture and sell IRIDIUM
         Paging Units, all pursuant to reasonable terms and conditions mutually
         acceptable to Seller and such third parties.

D.       Seller shall deliver, the Mobile Exchange Unit (MXU) Interface
         Specification.  Seller agrees to develop and sell MXUs to third
         parties and to license to responsible and competent suppliers
         acceptable to Seller the rights to use the information in the MXU
         Interface Specification and the Voice Encoding Algorithm to the extent
         essential to manufacture and sell IRIDIUM MXU's, all pursuant to
         reasonable terms and conditions mutually acceptable to Seller and such
         third parties.

E.       Seller agrees to develop and sell Subscriber Units (Voice) to third
         parties and to license the rights to manufacture, sell and use the
         Voice Encoding Algorithm to responsible and competent suppliers
         acceptable to Seller to the extent essential to manufacture and sell
         IRIDIUM Subscriber Units (Voice) all pursuant to reasonable terms and
         conditions mutually acceptable to Seller and such suppliers.





                                     Page 4
<PAGE>   8
IRIDIUM Space System Contract


F.       Seller shall deliver the Satellite Communications Link Interface
         Specification.

G.       Buyer understands that the Interface Specifications for the Gateways,
         Paging Unit, Mobile Exchange Unit and the Satellite Communications
         Link are Seller's proprietary information to be used only as permitted
         under ARTICLE 27, DISCLOSURE AND USE OF INFORMATION BY THE PARTIES,
         and may not be disclosed without Seller's permission except to those
         third parties licensed by Seller pursuant to this ARTICLE 2, or, upon
         completion of this Contract, to those third parties selected by Buyer
         for the purposes of obtaining a proposal for the delivery of IRIDIUM
         Space System equipment or services to Buyer after the five year period
         of the O&M Contract expires, provided, Buyer also permits Motorola the
         opportunity to submit a proposal for such equipment or services.

                  ARTICLE 3.  MILESTONE PERFORMANCE SCHEDULE.

A.       Seller shall perform all work and deliver the Constellation, System
         Control Segment, Space System Operations Plan, and the Satellite
         Subscriber Unit (Voice) Interface Specification pursuant to the
         milestone schedule in Exhibit A hereto.

B.       Seller shall complete the Gateway, Paging Unit, MXU, and Satellite
         Communication Link Interface Specifications under Paragraphs B, C, D
         and F of ARTICLE 2, DESCRIPTION OF WORK, and make them available to
         Buyer at Seller's Chandler, Arizona facility on or before the
         scheduled completion date of the final milestone specified in Exhibit
         A hereto.

C.       The milestone schedule in Exhibit A is subject to adjustment as
         provided in ARTICLE 11, EXCUSABLE DELAYS.

                               ARTICLE 4.  PRICE.

A.       For performance of this Contract, Buyer shall pay Seller  the
         $275,000,000 down payment and the applicable fixed milestone prices
         (the "$ Amount Due" column) specified in Exhibit A subject to
         adjustments in accordance with the provisions of this Contract.  The
         prices are stated in United States Dollars and cumulatively total
         $3,450,000,000.  See also ARTICLE 17, TAXES.

B.       In the event Seller fails to either (1) complete Milestone 47, or be
         deemed to have done so under ARTICLE 8, ACCEPTANCE CRITERIA, on or
         before the final scheduled completion date of Milestone 47, or, (2)
         satisfy or be deemed to have satisfied the Gateway Delivery Commitment
         as provided by ARTICLE 6, GATEWAY DELIVERY COMMITMENT, on or before
         the final scheduled completion date of Milestone 47, the final
         milestone price of this contract totaling $150 million is subject to
         reduction as provided below:

          (i)     For each day of the first ninety (90) days following the
                  final scheduled completion date of Milestone 47 that either
                  (1) Milestone 47 is not completed, or





                                     Page 5
<PAGE>   9
IRIDIUM Space System Contract

                  is not deemed to have been completed under ARTICLE 8,
                  ACCEPTANCE CRITERIA, or, (2) the Gateway Delivery Commitment
                  as provided by ARTICLE 6, GATEWAY DELIVERY COMMITMENT, is not
                  satisfied or is not deemed to have been satisfied, the price
                  of Milestone 47 shall be reduced by $388,889 (for a potential
                  total price reduction of $35 million).  To the extent,
                  however, that Seller has completed Milestone 47 but has only 
                  partially satisfied the Gateway Delivery Commitment by the
                  final scheduled completion date of Milestone 47, the price
                  reduction associated with the Gateway Delivery Commitment
                  shall be prorated to daily amounts equal to the percentage of
                  the Gateway Delivery Commitment actually satisfied on a daily
                  basis compared to the total Gateway Delivery Commitment.

                           For example:  If the Gateway Delivery Commitment is
                           equal to ten (10) Gateways, based upon actual
                           contracts signed in 1995; the final scheduled
                           completion date of Milestone 47 ends up as October
                           1, 1998; Milestone 47 is actually completed on
                           October 1, 1998; five (5) Gateways are delivered and
                           tested by October 1, 1998; three (3) additional
                           Gateways are delivered and tested on November 1,
                           1998; the two (2) other Gateways are delivered and
                           tested on February 1, 1999; and, if all of the
                           delays in the deliveries of the final five Gateways
                           after October 1, 1998 are attributed solely (i) to
                           Motorola's failure to exercise commercially
                           reasonable efforts under Paragraph C of Article 6,
                           or, (ii) to Motorola's inexcusable failure to timely
                           deliver and install those Gateways, then in such a
                           case, the price reduction allowable under this
                           paragraph would equal $10,616,669.70 ($388,889 x
                           5/10 = 194444.5; $194444.5 x 31 days = $6,027,779.5;
                           $388,889 x 2/10 = $77,777.8; $77,777.8 x 59 days =
                           $4,588,890.2; $6,027,779.5 + $4,588,890.2 =
                           $10,616,669.7).            
                           
          (ii)    For each complete thirty (30) days period beginning on the
                  ninety-first (91st) day following the final scheduled
                  completion date of Milestone 47 that Milestone 47 is not
                  completed, or is not deemed to have done so under ARTICLE 8,
                  ACCEPTANCE CRITERIA, the price of Milestone 47 shall be
                  reduced by $12,777,777 (for a potential total price reduction
                  of $115 million).

                           EXAMPLE:  If the final scheduled completion date of
                           Milestone 47 ends up as October 1, 1998 but the
                           milestone is not completed until January 15, 1999
                           and none of the Gateways subject to the Gateway
                           Delivery Commitment are delivered and tested until
                           March 15, 1999, the $150 million price of Milestone
                           47 shall be reduced by $35 million to $115 million.
                           (Note:  No price reduction beyond $35 million nor
                           any other remedy shall apply to Seller's failure to
                           satisfy the Gateway Delivery Commitment on or before
                           the final scheduled completion date of Milestone
                           47.)

          BUYER AGREES THAT THE FOREGOING PRICE REDUCTIONS SHALL BE ITS
          EXCLUSIVE REMEDY FOR DELAYS BY SELLER IN COMPLETING MILESTONE 47 OR
          IN SATISFYING THE GATEWAY DELIVERY COMMITMENT EXCEPT THAT A DELAY IN
          COMPLETING MILESTONE 47 IN EXCESS OF TWELVE (12)





                                     Page 6
<PAGE>   10
IRIDIUM Space System Contract

          MONTHS BEYOND ITS SCHEDULED COMPLETION DATE, AS MAY BE ADJUSTED UNDER
          THIS CONTRACT, SHALL PERMIT BUYER TO DECLARE SELLER IN DEFAULT UNDER
          ARTICLE 23, DEFAULT BY SELLER, HEREIN.

                              ARTICLE 5.  PAYMENT.

A.        The down payment referred to in ARTICLE 4, PRICE, shall be paid by
          Buyer to Seller in three increments in the amounts and on or before
          the date  specified by Exhibit A and without the necessity of any
          invoice being submitted by Seller.  The milestone prices referred to
          in ARTICLE 4, PRICE, shall be paid by Buyer to Seller upon completion
          of each milestone by Seller as provided in the Statement of Work,
          Exhibit B.  The milestone prices specified in Exhibit A shall in each
          case be paid by Buyer to Seller within thirty (30) calendar days
          following completion of each milestone and receipt of Seller's
          invoice for these payments.  Seller's invoice shall be accompanied by
          a certification by Seller that such milestone has been completed in
          accordance with this Contract.  Payment to Seller shall be made by
          cable/wire transfer to a banking institution as Seller designates or
          by such other means as Seller may designate from time to time.
          Notwithstanding the foregoing, Buyer may withhold the amount of
          $5,000,000 from Buyer's payment of Milestone 47 under the Space
          System Contract, and such amount shall become due and payable the
          earlier of: (i) thirty (30) days after Buyer's receipt of an invoice
          and certification that the activation of Release 3 functionality into
          the IRIDIUM Communications System for commercial services has been
          completed, which is scheduled for April 1999; or (ii) June 1, 1999.

B.        In the event Seller completes a specific milestone prior to the
          scheduled completion date in Exhibit A (as such dates may be adjusted
          pursuant to the terms of this Contract), Buyer shall not be obligated
          to make the payment associated with such milestone until thirty days
          after such scheduled completion date.

C.        In the event Seller fails to complete any milestone on or before the
          scheduled completion date shown in Exhibit A (as such dates may be
          adjusted pursuant to the terms of this Contract), Buyer shall be
          relieved of its obligation to pay the applicable amount specified for
          such milestone until such time as Seller completes or is deemed to
          have completed such milestone.  THIS SHALL CONSTITUTE BUYER'S
          EXCLUSIVE RIGHT AND REMEDY FOR SELLER'S FAILURE TO COMPLETE ANY OR
          ALL SUCH MILESTONES IN ACCORDANCE WITH THE SCHEDULE SHOWN IN EXHIBIT
          A (AS SUCH DATES MAY BE ADJUSTED PURSUANT TO THE TERMS OF THIS
          CONTRACT); PROVIDED, HOWEVER, THAT IF COMPLETION OF THE FINAL
          MILESTONE IS DELAYED, BUYER SHALL HAVE THE ADDITIONAL RIGHTS AND
          REMEDIES PROVIDED BY PARAGRAPH B OF ARTICLE 4, PRICE.  SELLER'S
          FAILURE TO TIMELY COMPLETE ANY MILESTONE SHALL NOT RELIEVE BUYER FROM
          ITS OBLIGATION TO PAY FOR OTHER MILESTONES AS THEY ARE COMPLETED;
          PROVIDED, HOWEVER, THAT UNTIL MILESTONE NUMBER 22 IS COMPLETED, BUYER
          SHALL NOT BE OBLIGATED





                                     Page 7
<PAGE>   11
IRIDIUM Space System Contract

          TO PAY FOR MILESTONES COMPLETED MORE THAN SIX (6) MONTHS AFTER THE
          SCHEDULED COMPLETION DATE OF MILESTONE NUMBER 22.

D.        In the event Seller does not satisfy the Gateway Delivery Commitment
          obligation on or before the final scheduled completion date of
          Milestone 47, Buyer agrees to promptly pay to the Seller upon
          completion of Milestone 47 the amount due for the completion of
          Milestone 47 which amount and the method and timing of its payment
          shall be calculated in accordance with the provisions of this
          contract (including Paragraph B of Article 4, and Paragraph A of this
          Article 5 and Paragraph C of Article 8).  Upon the earlier of
          satisfaction of the Gateway Delivery Commitment, or 90 days after the
          scheduled completion of Milestone 47, Buyer shall promptly pay to
          Seller all of the balance of the price for Milestone  47 not
          previously paid to Motorola less only amounts determined by applying
          the reduction specified in Paragraph B(i) of ARTICLE 4, PRICE.

                  For example, under the same assumptions used in the example
                  following Paragraph B(i) of Article 4, Motorola would be
                  entitled to receive $132,500,000 on Oct. 1, 1998 and
                  $6,883,330.30 on December 29, 1999.

E.        Buyer shall have the right to challenge the assertion of Seller that
          any milestone has been completed in accordance with the Milestone
          Acceptance Criteria by providing Seller with written notice to such
          effect within 20 days following receipt of Seller's invoice.  Such
          notice shall summarize the reasons for such challenge and Seller
          shall respond thereto in writing or orally within 5 days of receipt
          of such challenge.  Failure to resolve any dispute between Seller and
          Buyer with respect to any such challenge shall be resolved in
          accordance with ARTICLE 36, APPLICABLE LAW.  Nothing herein shall be
          construed to limit Buyer's rights under ARTICLE 23, DEFAULT BY
          SELLER, nor Seller's rights under ARTICLE 24, DEFAULT BY BUYER.

                    ARTICLE 6.  GATEWAY DELIVERY COMMITMENT

A.        Subject to the provisions herein, Seller hereby agrees that no later
          than September 23, 1998, it will have delivered, installed and
          achieved Final Acceptance or Conditional Acceptance of thirteen
          Gateway Equipment systems with Release 1, 2 and 3 services and
          functional capabilities pursuant to the terms of Gateway Equipment
          Purchase Agreements expected to be signed by Motorola and Gateway
          Equipment purchasers and containing reasonable terms and conditions
          mutually acceptable to Seller and such Gateway Equipment purchasers
          and containing reasonable terms and conditions mutually acceptable to
          Seller and such Gateway Equipment purchasers.  The foregoing
          agreement is referred to as the Gateway Delivery Commitment.  This
          Gateway Delivery Commitment is provided solely for the purpose
          provided in Paragraph B of ARTICLE 4, PRICE.  It may not be used for
          any other purpose and Motorola shall not have any liability to any
          third party for damages incurred by any such third party in the event
          Motorola fails to satisfy such Gateway Delivery Commitment for any
          reason whatsoever.





                                     Page 8
<PAGE>   12
IRIDIUM Space System Contract


B.        The Gateway Delivery Commitment will be deemed to have been satisfied
          for purposes of this Contract and specifically Paragraph B of ARTICLE
          4, PRICE, on the date when the earliest of the following conditions
          occurs:

          1.      when thirteen (13) Gateway Equipment systems have been
                  delivered, installed and achieved Final Acceptance for
                  Release 1, 2 and 3 services and functional capabilities.

          2.      when Conditional Acceptance occurs for thirteen (13) Gateway
                  Equipment systems pursuant to the terms of the Gateway
                  Equipment Purchase Agreements between Seller and Gateway
                  Equipment purchasers.

          3.      when the first Revenue Producing Communication Message is
                  transmitted through the Space System or any component
                  thereof.

C.        The Gateway Delivery Commitment for thirteen (13) Gateway Equipment
          systems is expressly conditioned upon:

          1.      at least ten (10) complete Gateway Equipment Purchase
                  Agreements being signed by both Motorola and ten (10) Gateway
                  Equipment purchasers on or before September 30, 1995 for the
                  delivery and installation of M030 or larger Gateway Equipment
                  systems with seven (7) of them scheduled to be installed no
                  later than April 30, 1998 and three (3) of them scheduled to
                  be installed no later than June 30, 1998; and,

          2.      at least three (3) more complete Gateway Equipment Purchase
                  Agreements being signed by both Motorola and three (3) more
                  Gateway Equipment purchasers on or before December 30, 1995
                  for the delivery and installation of M030 or larger Gateway
                  Equipment systems with all three of them scheduled to be
                  installed no later than September 30, 1998; and,

          3.      All thirteen Gateway Equipment systems must also each be
                  contracted for delivery to one of the following Gateway
                  Countries:  Brazil, Cyprus or Canary Islands (Spain), China
                  (PRC), Germany, India, Indonesia, Italy, Japan, South Korea,
                  Russia, Taiwan (ROC), Thailand and the United States.

          Motorola agrees to exert commercially reasonable efforts to negotiate
          and conclude Gateway Purchase Agreements with Gateway purchasers by
          the dates specified above.  However, in the event Motorola exerted
          its commercially reasonable efforts, but less than the ten (10) and
          three (3) Gateway Equipment Purchase Agreements referred to above are
          signed by both Motorola and Gateway Purchasers by the dates specified
          above, the Gateway Delivery Commitment shall be reduced from the
          thirteen (13), down by the number of such agreements which were not
          so signed by Motorola and Gateway Equipment purchasers.





                                     Page 9
<PAGE>   13
IRIDIUM Space System Contract


          Example:  If seven Gateway Equipment Purchase Agreements are signed
          by September 30, 1995 and an additional four are signed by December
          30, 1995, the Gateway Delivery Commitment shall be reduced to ten
          (10) Gateway Equipment systems assuming Seller exerted its
          commercially reasonable efforts to conclude thirteen Gateway
          Equipment Purchase agreements by the dates specified in C.1. and 2.,
          above.

D.        In the event the scheduled delivery date of any of the Gateway
          Equipment systems covered by any of the thirteen Gateway Equipment
          Purchase Agreements referred to in this ARTICLE 6, GATEWAY DELIVERY
          COMMITMENT is changed to a date later than the applicable delivery
          date specified in subparagraph C.1 or 2 herein for any reason other
          than the default by Motorola, or its failure to exert its
          commercially reasonable efforts, all such Gateway Equipment systems
          shall be deemed to have been delivered, installed and successfully
          tested through Release 1, 2 and 3 services and functional
          capabilities and Conditional Acceptance for purposes of Paragraph B 1
          and 2 above on the date that Milestone 47 is completed or is deemed
          to have been completed.

E.        In the event any of the thirteen Gateway Equipment Purchase
          Agreements referred to in this ARTICLE 6, GATEWAY DELIVERY COMMITMENT
          is terminated for any reason other than the default by Motorola, all
          Gateway Equipment systems covered by such terminated Agreement(s)
          shall be deemed to have been delivered, installed, and successfully
          tested through Release 1, 2 and 3 services and functional
          capabilities and Conditional Acceptance for purposes of Paragraphs B
          1 and 2 above on the date that Milestone 47 is completed or is deemed
          to have been completed.

F.        Release 1, 2 and 3 for purposes of this Contract refer to those
          specific services and functional capabilities which are defined in
          the Terrestrial Network Development Contract (TNDC) between Seller
          and Buyer.

         ARTICLE 7.  OPERATION OF SYSTEM CONTROL SEGMENT FACILITIES.

A.        Notwithstanding the transfer to the Buyer of title and risk of loss
          to each space vehicle of the Space Segment and each facility of the
          System Control Segment, Seller shall be responsible for the
          management and control of the Space System during the Initial
          Operating Period.  Both parties hereto recognize that Seller's
          obligation to deliver the Space System necessarily requires that
          Buyer permit Seller to maintain control and be permitted unrestricted
          access to all of the Facilities of the System Control Segment during
          the Initial Operating Period.  The specific operations activities to
          be performed by Seller are more fully described in the Statement of
          Work, Exhibit B hereto.  After the Initial Operating Period,
          performance of such operations activities by Seller shall be pursuant
          to the Operations and Maintenance Contract (see ARTICLE 30,
          RELATIONSHIP WITH OTHER AGREEMENTS).

B.        Buyer agrees that its failure to procure the insurance required by
          ARTICLE 21, INSURANCE, or any other act or failure to act by Buyer
          that delays or prevents





                                    Page 10
<PAGE>   14
IRIDIUM Space System Contract

          Seller's access to and/or operation of such System Control
          Facility(ies) shall entitle Seller to a prompt equitable adjustment
          to the schedule and price of this Contract.  In the event such delay
          associated with Buyer's acts or failures to act cumulatively result
          in a delay or series of delays in excess of six (6) months, Seller
          may elect at its option to treat such situation as a default by Buyer
          thereby permitting Seller to terminate this Contract pursuant to
          ARTICLE 24, DEFAULT BY BUYER, herein.

                        ARTICLE 8.  ACCEPTANCE CRITERIA.

A.        Subject to Paragraph C below, acceptance of the Constellation and
          System Control Segment described in ARTICLE 2, DESCRIPTION OF WORK,
          shall be in accordance with the Acceptance Plan, Exhibit C hereto.

B.        Subject to Paragraph C below, acceptance of the Satellite Subscriber
          Unit (Voice) Interface Specification and Space System Operations Plan
          described in ARTICLE 2, DESCRIPTION OF WORK, shall occur upon
          delivery of each such document by Seller to Buyer at Seller's
          Chandler, Arizona facility.  Buyer shall promptly accept the items in
          writing or shall notify the Seller in writing of those particulars in
          which the items delivered do not meet the requirements of this
          Contract.  Buyer shall be deemed to have accepted such items thirty
          (30) days after delivery by Seller unless Buyer provides before such
          time written notice otherwise to Seller.  In the event Buyer provides
          Seller with written notice setting forth the particulars in which the
          items delivered do not meet the requirements of this Contract, upon
          establishment by Seller and completion of a reasonable corrective
          action plan acceptable to Buyer, the item involved shall be deemed to
          have been delivered and finally accepted.

C.        Notwithstanding Seller's inability to demonstrate compliance with the
          criteria of the Statement of Work specified by Section 4 of the
          Acceptance Plan, if Buyer chooses to use or permit others to use the
          Space System after the scheduled completion date of Milestone Number
          47, the date of the first Revenue Producing Communication Message
          transmitted through the Space System or any component thereof shall
          be deemed the date of completion and acceptance by Buyer of all items
          required to be delivered by Seller under this Contract.  The final
          milestone price shall be adjusted by reducing it first to account for
          any schedule delay as provided by Paragraph B of ARTICLE 4, PRICE.
          The remaining balance, if any, shall be promptly paid to Seller after
          adjustment to account for the deficiencies of the Space System using
          Table 8.1.





                                    Page 11
<PAGE>   15
IRIDIUM Space System Contract

                                   Table 8.1

- --------------------------------------------------------------------------------
Downward adjustment to remaining balance of final milestone price shall be
based upon a calculated quarterly Average Actual Service Provided percentage
(AASP) value of less than 98% in either or both of the coverage or capacity
factors:

<TABLE>
<CAPTION>
Calculated AASP                   Calculated AASP                  Percent
Coverage Factor                   Capacity Factor                 Reduction
- ---------------                   ---------------                 ---------
<S>                               <C>                              <C>
 97% Minimum                       70% Minimum                       1%
 96% Minimum                       70% Minimum                       2%
 95% Minimum                       70% Minimum                       3%
 94% Minimum                       60% Minimum                       8%
 93% Minimum                       60% Minimum                       13%
 92% Minimum                       60% Minimum                       18%
 91% Minimum                       50% Minimum                       28%
 90% Minimum                       50% Minimum                       38%
 89% Minimum                       50% Minimum                       48%
 88% Minimum                       40% Minimum                       58%
 87% Minimum                       40% Minimum                       68%
 86% Minimum                       40% Minimum                       78%
 85% Minimum                       30% minimum                       88%
 84% Minimum                       30% Minimum                       98%
 83% Minimum                       30% Minimum                      100%
 and below                         and below
- --------------------------------------------------------------------------------
</TABLE>

For example if the AASP coverage factor is calculated to be 93.1% and the AASP
capacity factor is calculated to be 58.1%, the remaining balance of the final
milestone price after accounting for the schedule delay, if any, shall be
reduced by 28%.

                           ARTICLE 9. TITLE TRANSFER.

Unless otherwise stated herein, the following shall apply:

A.        Title and risk of loss or damage to each individual space vehicle of
          the Constellation shall pass to Buyer upon the arrival of each space
          vehicle at its designated orbital location in the Constellation.

B.        Title and risk of loss or damage to each facility of the System
          Control Segment shall pass to Buyer upon the earlier of (1) when
          Seller demonstrates to Buyer successful completion of each SCS
          Facility's Acceptance Plan as specified in Exhibit C hereto or (2)
          completion of Milestones 40 and 41 respectively.

C.        Title to the Space System Operations Plan described in ARTICLE 2,
          STATEMENT OF WORK, shall pass to Buyer upon delivery of such item from
          Seller to Buyer at Seller's Arizona facility or other facility
          designated by Seller upon completion of Milestone Number 15.





                                    Page 12
<PAGE>   16
IRIDIUM Space System Contract

D.        Title to the Gateway, Paging Unit, Mobile Exchange Unit and Satellite
          Communication Link Interface Specifications shall remain with Seller
          and shall not be transferred to Buyer under this Contract.

E.        To the extent successful and timely completion of any milestone of
          this Contract is affected by the loss of or damage to any item(s) due
          to the acts of third parties (including space debris) after title and
          risk of loss has transferred to Buyer as provided above, Buyer shall
          afford Seller an equitable adjustment to the price and schedule of
          this Contract to account for the time and costs associated with
          Seller's correction, repair or replacement of such item(s).  The
          prices and payment provisions for the replacement of space vehicles of
          the Constellation that are lost or damaged by the acts of third
          parties (including space debris) shall be the same as specified in the
          Operation and Maintenance Contract referred to in ARTICLE 30,
          RELATIONSHIP WITH OTHER AGREEMENTS.

F.        Subject to the license granted to Buyer under Article 14, title to the
          Satellite Subscriber Unit (Voice) Interface Specification shall remain
          with Seller. However, both parties may release such document to third
          parties.

                             ARTICLE 10.  CHANGES.

Changes to this Contract may be made only by mutual agreement of the parties
hereto.  Such changes shall be evidenced by a written agreement executed by
authorized representatives of both parties.  No change shall be binding on
either party unless and until such written document is fully executed by both
parties.

                         ARTICLE 11.  EXCUSABLE DELAYS.

A.        Without limiting any other provision specifying what constitutes an
          excusable delay under this Contract, any event which causes a failure
          or delay to perform hereunder, and in every case is beyond the
          reasonable control and without the fault or negligence of Seller and
          its subcontractors hereunder shall constitute an excusable delay, if
          notice thereof is given to Buyer within thirty (30) days after such
          event shall have occurred.  Such excusable delay events include but
          are not limited to acts of God or of the public enemy; acts of
          governments in their sovereign or contractual capacity, including
          government priorities, allocations, regulations or orders affecting
          materials, facilities, or completed spacecraft; fires; floods;
          snowstorms; earthquakes; epidemics; quarantine restrictions; strikes;
          labor difficulties; wars and freight embargoes. Delays in launches of
          Spacecraft caused by the actions or inactions of Seller's launch
          service subcontractors directly pursuant to their subcontracts with
          Seller shall not constitute excusable delays hereunder.  All other
          delays in launches of Spacecraft arising for whatever reason not
          caused by Seller shall constitute excusable delays hereunder. Such
          excusable delays include but are not limited to delays in the
          launch(es) of Seller's spacecraft due to delays of any other
          launch(es) (i.e. not for this Contract) preceding any of Seller's
          scheduled launch(es) whether or
          




                                    Page 13
<PAGE>   17
IRIDIUM Space System Contract

          not caused by the actions or inactions of Seller's launch service
          subcontractors relating to such preceding launches.

B.        In the event of any such excusable delay, the performance schedule
          shall be extended equitably and the price shall be adjusted to account
          for any additional costs incurred by Seller as a result of such delay.
          Seller has the burden to prove an event constitutes an excusable
          delay.  Seller shall provide Buyer with evidence supporting Seller's
          claim of excusable delay and shall exert its best efforts to mitigate
          such additional costs or schedule impact to the extent reasonable.
          
                          ARTICLE 12.  BUYER'S ACCESS.

For the purpose of observing the status and quality of Seller's performance of
work, Seller shall afford a limited number of Buyer's employees, or, designees
as approved by Seller, subject to ARTICLE 22, EXPORT REGULATIONS, access to
Contract activities including design reviews, systems and subsystems testing,
program management reviews, test reviews and failure reviews at the Seller's
and its first-tier subcontractor's facilities on a non-interference basis.
Seller's approval of designees requested by Buyer shall not be unreasonably
withheld; provided, however, that such approval may be withheld if Seller or
its first-tier Subcontractor(s) have reasonable concerns as to the protection
of their proprietary information or potential injury to their competitive
market position(s).

                        ARTICLE 13.  PROGRESS MEETINGS.

A.        Meetings and Presentations.  During the performance of this Contract,
          Seller shall conduct Quarterly Summary Executive Reviews at which
          Seller shall provide a review of the milestones completed subsequent
          to the preceding quarterly review, status of the upcoming milestone
          and such other matters as may be mutually agreed upon by the parties.
          The parties may mutually agree to conduct additional interim meetings
          or reviews from time to time such as a monthly Program Manager's
          Review with a mutually acceptable agenda.  Buyer shall determine its
          appropriate management personnel to attend such meetings.  Seller
          shall be represented by its General Manager or a designee thereof and
          such other personnel as are specifically required to support the
          particular presentation.  All periodic meetings shall be held at
          Seller's facility.

B.        Distribution of Reports.  Copies of viewgraphs or other documents
          utilized during these meetings shall be furnished or be made available
          to Buyer.  All materials, reports, and documentation furnished
          pursuant to this Article shall remain the property of Seller and shall
          be subject to the limitations set forth in ARTICLE 27, DISCLOSURE AND
          USE OF INFORMATION BY THE PARTIES.

                   ARTICLE 14.  INTELLECTUAL PROPERTY RIGHTS.

A.        Except for computer programs and related documentation which are
          covered by Paragraph C below, unless this Contract is terminated
          pursuant to ARTICLE 24,





                                    Page 14
<PAGE>   18
IRIDIUM Space System Contract

          DEFAULT BY BUYER, or ARTICLE 25, TERMINATION FOR CONVENIENCE, Buyer
          shall have an unlimited right to use, duplicate, and disclose the
          information contained in the Satellite Subscriber Unit (Voice)
          Interface Specification and Space System Operations Plan furnished
          pursuant to ARTICLE 2, DESCRIPTION OF WORK, of this Contract; however,
          if any written material furnished as part of said documentation is
          copyrighted, Buyer shall have an unlimited right to make copies of
          such copyrighted material and to use such copies for any Buyer purpose
          without payment of additional compensation to Seller only to the
          extent that Seller has the authority to grant such right.  In the
          event Seller does not have such right, Seller will use its best
          reasonable efforts to obtain such rights for Buyer.  In the event that
          the obtaining of such rights involve the payment of a fee, Buyer shall
          reimburse Seller for said fee.
          
B.        Except for the data listed in Paragraph A above, and the license
          described in Paragraph E below, all data, including without
          limitation, manufacturing processes technology, and any other
          information relating to terrestrial cellular networks or components,
          that are or may be delivered or disclosed by Seller to Buyer shall be
          subject to ARTICLE 27, DISCLOSURE AND USE OF INFORMATION BY THE
          PARTIES and Buyer acquires no rights, title or interest in such
          intellectual property or other intellectual property associated with
          the design of the Space System except as is provided under this
          ARTICLE 14E or otherwise may be negotiated in other license agreements
          between Seller and Buyer pursuant to reasonable terms and conditions
          mutually acceptable to Seller and Buyer.

C.        To the extent computer software and documentation delivered under the
          Contract is proprietary to either Seller or its licensor, such items
          shall be provided as proprietary information under ARTICLE 27,
          DISCLOSURE AND USE OF INFORMATION BY THE PARTIES.  Notwithstanding any
          other provisions of this Contract, the ownership and title to
          copyrights in computer programs and related documentation that may be
          delivered to Buyer by Seller in accordance with the Contract shall
          remain in Seller or Seller's licensor.

          1.   To the extent that Seller has the right to do so, Seller shall
               grant to Buyer, with respect to software and related
               documentation delivered in written or magnetic or optical form
               under the Contract as part of the System Control Segment
               facilities, a paid-up, non-exclusive, non-transferable license
               with respect to such software and documentation, to:

               a.      use or have used on Buyer's behalf solely for the
                       operation and maintenance of Buyer's IRIDIUM Space System
                       supplied by Seller and direct replacements thereto
                       whether manufactured by Seller or not; and

               b.      make one or more back-up copies for retention in a secure
                       area in case a working copy is destroyed or damaged, the
                       number of back-up copies to be consistent with generally
                       accepted and prudent data processing archive procedures,
                       not to exceed six (6) such copies.





                                    Page 15
<PAGE>   19
IRIDIUM Space System Contract

    2.   Buyer has no right to copy or have copied or modify software that is
         (a) not supplied in written form or on optical or magnetic media, or
         (b) not supplied as a part of the System Control Segment equipment, or
         (c) embedded as firmware in any equipment delivered by Seller.

    3.   Buyer's license set forth in paragraph C.1.a. shall become effective
         on completion of the Operations and Maintenance (O & M) Contract by
         Seller.  Buyer's license under Paragraph C.1.b. shall become effective
         upon completion of this Space System Contract.

D.  Seller agrees to promptly assign to Buyer all Seller's right, title and
    interest in the word "IRIDIUM(R)" as a tradename, trademark and service
    mark in all forms used by Seller.  Seller will execute such documents as
    requested by Buyer to effect such assignment.  Buyer shall thereafter
    assume responsibility for registration and perfection of such tradename and
    trademarks and assignments, and Seller will cooperate with buyer to that
    end.  Seller may thereafter use such marks on Seller's goods and services
    only with Buyer's written permission.

E.  In order to permit Buyer to engage in competitive bidding for future
    additions to or replacement of the Space System and its parts after its
    delivery by the Seller, and for future operation and maintenance of the
    Space System beyond completion of the initial Operations and Maintenance   
    (O & M) Contract by Seller, Seller and Buyer agree as follows:

    1.   Subject to the other provisions of this ARTICLE 14, Seller agrees to
         grant Buyer a non-exclusive right and license to use, make and
         have-made equipment comprising the Space System of the IRIDIUM
         Communications System and its subsequent evolutions, under the then
         current versions of the Satellite Communications Link, Gateway, MXU,
         and Paging Unit Interface Specifications and Seller's patents
         essential to utilize these Interface Specifications in the Space
         System and subsequent evolutions thereof.  Such license shall be
         irrevocable except for events of default by Buyer under this Space
         System Contract or the O & M Contract.  Such license shall become
         effective upon completion of this Space System Contract for purposes
         of obtaining quotations from other vendors and for purposes of
         obtaining delivery of such equipment upon completion of the O & M
         Contract.

    2.   Subject to the other provisions of this ARTICLE 14, Seller agrees to
         grant Buyer a non-exclusive right and license to have-used services
         for operating the Space System of the IRIDIUM Communications System
         and its subsequent evolutions, under the then current versions of the
         Satellite Communications Link, Gateway, MXU, and Paging Unit Interface
         Specifications and Seller's patents essential to utilize these
         Interface Specifications in the Space System and subsequent evolutions
         thereof.  Such license shall be irrevocable except for events of
         default by Buyer under this





                                    Page 16
<PAGE>   20
IRIDIUM Space System Contract

         Space System Contract or the O & M Contract.  Such license shall
         become effective for purposes of obtaining quotations from other
         service vendors one year prior to completion of the O & M Contract,
         and for purposes of obtaining delivery of such services upon
         completion of the O & M Contract.

    3.   Buyer is free to exercise the make or have-made and use or have used
         rights granted in paragraphs E.1 and E.2 above and select its own
         vendors therefore, provided that:

         a.      Buyer also permits Seller the opportunity to submit a proposal
                 for such equipment or services on at least an equal footing
                 with all other prospective vendors for the same equipment or
                 services.

         b.      In the event that a vendor chosen by Buyer has intellectual
                 property rights that would prevent Seller from effectively
                 competing for the sale of IRIDIUM equipment and services, if
                 Seller requests, Buyer agrees to require such vendor, as a
                 condition of the acceptability of its proposal, to extend a
                 license to Seller on reasonable terms and conditions under
                 vendor's intellectual property essential to such effective
                 competition by Seller, to enable Seller to make, have made,
                 use, have used, sell, lease or otherwise provide any IRIDIUM
                 equipment and services, to users thereof, including ground and
                 space.

         c.      Buyer shall pay Seller a royalty of six (6) percent of the
                 final price paid by Buyer for replacements to or evolutions of
                 the Space System or its individual components, excluding the
                 reasonable cost of launch services if any included in such
                 price, and less the reasonable value of any licenses obtained
                 by Buyer for Seller under this Section E.4.3.

         d.      Buyer agrees not to engage vendors for Space System equipment
                 or services under this ARTICLE 14 whose governments have not
                 licensed or allowed operation of the IRIDIUM System in their
                 own countries or have not granted frequency allocations
                 required for such operation.

    4.   The Parties intend and will exert their best reasonable efforts to
         enter into a mutually acceptable license agreement consistent with the
         terms described herein prior to completion of this Space System
         Contract.


                         ARTICLE 15.  PATENT INDEMNITY.

A.  Subject to the limitations contained or referred to herein, Seller will
    defend at its own expense, any claim, suit or proceeding brought against
    Buyer on account of the Space System or any part thereof supplied by Seller
    to Buyer under this Contract, FOR INFRINGEMENT OF ANY VALID AND ENFORCEABLE
    PATENT IN ANY COUNTRY OF THE WORLD WHERE AN IRIDIUM SERVICE PROVIDER HAS
    BEEN AUTHORIZED TO PROVIDE IRIDIUM SERVICES by an Authorized Gateway





                                    Page 17
<PAGE>   21
IRIDIUM Space System Contract

          Operator, and, to the extent required, licenses by the government of
          such country to provide IRIDIUM services.  In responding to such
          claim, suit or proceeding Seller shall have the option of settling or
          resolving such claim, suit, or proceeding by any one or more of the
          following:

          1.      procuring for Buyer the right under such patent to use,
                  lease, or sell, as appropriate, the Space System or
                  infringing part thereof; or,

          2.      replacing the Space System or infringing part thereof; or,

          3.      modifying the Space System or part thereof so as not to
                  infringe; or,

          4.      paying any settlement or any final judgment entered by a
                  court of competent jurisdiction against Buyer on such
                  infringement defended by Seller.

B.        Buyer agrees that Seller shall be relieved of the foregoing
          obligations unless Buyer notifies Seller promptly in writing of any
          such claim, suit or proceeding, and at Seller's expense, cooperates
          with and gives Seller complete information and assistance to
          mitigate, settle and/or defend any such claim, suit or proceeding.
          In the event that the actual liability of Seller as a consequence of
          a claim, suit or proceeding or a combination of claims, suits or
          proceedings in a particular country exceeds ten percent (10%) of the
          actual income derived by Buyer from operation of the IRIDIUM
          Communication System in such country, then Buyer shall cooperate with
          Seller to mitigate Seller's liability, including either terminating
          service in such country or releasing Seller from any obligation for
          liability for patent infringement in such country in excess of the
          aforesaid percentage of Buyer's income in such country.

C.        Seller shall have no liability for any infringement arising from:

          1.      the combination of the Space System or any part thereof with
                  any other product or service not furnished by Seller; or

          2.      the modification of the Space System or any part thereof
                  unless such modification was made by Seller; or

          3.      a patent of a country not included in Section A of this 
                  Article 15.

D.        Subject to all the provisions of this Article 15, PATENT INDEMNITY,
          Seller's entire liability hereunder, including liability for
          attorney's fees, costs, adverse judgements and other compliance with
          the provisions hereof, shall be limited to the amount Buyer paid
          Seller for the particular items found to infringe.  Furthermore,
          Seller's entire liability under this Article 15 shall be subject to
          the overall limitation of liability under Article 26, LIMITATION OF
          LIABILITY.

E.        Seller shall not be liable for any costs or expense incurred pursuant
          to this Article without Seller's written authorizations.  SELLER
          SHALL IN NO EVENT BE LIABLE FOR LOSS OF USE OR FOR INCIDENTAL,
          SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT OR
          IN TORT OR UNDER ANY OTHER CAUSE OF ACTION.  THE FOREGOING STATES THE
          ENTIRE WARRANTY BY SELLER AND THE EXCLUSIVE REMEDY OF BUYER, WITH





                                    Page 18
<PAGE>   22
IRIDIUM Space System Contract

          RESPECT TO ANY ALLEGED PATENT INFRINGEMENT BY THE SPACE SYSTEM OR ANY
          PART THEREOF OR ANY OTHER PRODUCT DELIVERED BY SELLER TO BUYER UNDER
          THIS CONTRACT.

F.        Buyer shall indemnify, defend and hold Seller harmless against any
          expense, judgement, or loss for infringement of any patents,
          copyrights or trademarks which results from Seller's compliance with
          Buyer's designs, specifications, or instructions.

G.        Except as specifically provided by ARTICLE 14, INTELLECTUAL PROPERTY
          RIGHTS, and any other written agreements between the parties, no
          sale, or lease hereunder shall convey any license by implication,
          estoppel, or otherwise to Buyer, under any proprietary rights,
          copyrights, or patents rights of Seller.


                             ARTICLE 16.  WARRANTY.

A.        Seller warrants that immediately upon completion of this Contract but
          not thereafter, the Space System shall comply with the requirements
          specified in the Acceptance Plan, Exhibit C.  This warranty, however,
          terminates in the event Buyer uses or permits others to use the Space
          System or any component thereof prior to completion of this Contract.

B.        THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, WHETHER STATUTORY,
          EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
          MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ALL OF WHICH ARE
          EXPRESSLY EXCLUDED.  SELLER SHALL HAVE NO OTHER LIABILITY, WHETHER IN
          CONTRACT, TORT, NEGLIGENCE, OR OTHERWISE, INCLUDING WITHOUT
          LIMITATION, ANY LIABILITY FOR SPECIAL, INCIDENTAL, INDIRECT, OR
          CONSEQUENTIAL DAMAGES, OR FOR BUYER'S COST OF EFFECTING COVER, OR FOR
          FAILURE OR NONPERFORMANCE OF PROPERTY OR FOR LOST PROFIT OR REVENUE.

                              ARTICLE 17.  TAXES.

A.        The price of this Contract referred to in ARTICLE 4, PRICE, includes
          all transportation and related charges and all applicable taxes,
          duties and similar liabilities whatsoever for delivery of all items
          to a destination in the continental United States, except any tax on
          the sale to Buyer of any item delivered hereunder.  Buyer will
          reimburse Seller for any such sales, use tax or duty drawback claim
          Seller is required by law to pay.

B.        If requested by the other party, the Seller and Buyer will cooperate
          with each other in contesting and/or protesting those taxes which
          either party reasonably deems inappropriate.  In return for such
          cooperation, the Seller and Buyer agree to indemnify each other
          against and hold each other harmless from any such tax that the other
          party is responsible to pay under Paragraph A above, and from any
          costs,





                                    Page 19
<PAGE>   23
IRIDIUM Space System Contract

          expenses, penalties or fees (including reasonable attorney's fees)
          which either party incurs in cooperating with the other.

                      ARTICLE 18.   PERMITS AND LICENSES.

A.        Seller or one of its wholly-owned subsidiaries shall apply for and
          use its reasonable best efforts to obtain all permits, licenses and
          approvals required by the United States Federal Communications
          Commission (FCC) or by any applicable U.S. law or regulation, as well
          as all necessary orbital locations and radio frequency spectrum, to
          construct, launch and operate the Space Segment and to construct and
          operate the System Control Segment.  Specifically, Seller or one of
          its wholly-owned subsidiaries shall apply to and use its reasonable
          best efforts to obtain from the FCC a construction permit(s) to build
          the Space Segment and at least one of the System Control Segment
          facilities within the United States.  In the event such permit to
          construct all of the spacecraft and System Control Segment facilities
          is not issued by the FCC or other authorized Government entity
          acceptable to Buyer (whether U.S. or foreign) to Seller or its
          wholly-owned subsidiary on or before December 1, 1994, such situation
          shall be treated as an excusable delay under ARTICLE 11, EXCUSABLE
          DELAYS, and the price only of this Contract shall be adjusted
          accordingly for costs incurred by Seller after December 1, 1994 as a
          result of failure to obtain such permit.  In the event such permit to
          construct all of the spacecraft and System Control Segment Facilities
          is not issued by the FCC or other authorized Government entity
          acceptable to Buyer (whether U.S. or foreign) to Seller or its
          wholly-owned subsidiary on or before January 1, 1995, such situation
          shall be treated as an excusable delay under ARTICLE 11,  EXCUSABLE
          DELAYS, and the price and schedule of this Contract shall be adjusted
          accordingly for costs incurred by Seller after December 1, 1994 and
          for schedule delays incurred by Seller after January 1, 1995 as a
          result of failure to obtain such permit.  Seller or one of its
          wholly-owned subsidiaries also shall apply for and use its reasonable
          best efforts to obtain from the FCC a license(s) to launch and
          operate the Space System within the United States and between the
          United States and international points.  If such license to launch
          and operate is not issued to Seller or its wholly-owned subsidiary by
          February 1, 1996, such situation shall be treated as an excusable
          delay under ARTICLE 11,  EXCUSABLE DELAYS, and the price and schedule
          of this Contract shall be adjusted accordingly.  Seller shall exert
          its best reasonable efforts to mitigate the impact of any such
          excusable delays by attempting to obtain a waiver, alternate license
          (i.e., an experimental license) or undertaking other actions as
          determined appropriate in Seller's discretion.

B.        Seller shall use its reasonable best efforts to coordinate within the
          United States and on a worldwide basis the effective use by the Space
          System of the necessary frequency spectrum and orbital locations.

C.        Seller shall use it reasonable best efforts to defend and maintain
          all of the aforementioned approvals, permits, and licenses for the
          Space System and System Control Segment in accordance with their
          respective terms and conditions, and to





                                    Page 20
<PAGE>   24
IRIDIUM Space System Contract

          operate the Space System and System Control Segment in accordance
          with all applicable laws and government regulations.  In the event a
          wholly-owned subsidiary of Seller is issued the FCC Operating License
          contemplated in Paragraph A above, Seller agrees to maintain its
          complete ownership of such wholly-owned subsidiary until such time as
          such FCC license is transferred to Seller, a third party approved by
          Buyer and the FCC, or to Buyer pursuant to Paragraph H below.

D.        Seller shall pay for its costs of applying for, obtaining and
          renewing the aforementioned approvals, licenses and permits.  Buyer
          agrees to reimburse Seller for all of its other expenses associated
          with the aforementioned approvals, licenses, permits, and allocations,
          including but not limited to Seller's costs of defending against
          challenges by third parties, and for coordinating within the United
          States and on a worldwide basis the effective use by the Space System
          of the necessary frequency spectrum.

E.        Seller agrees to keep Buyer fully informed on a timely basis of
          material events relating to the operational and performance status of
          the Space System, and any communications relating the aforementioned
          approvals, licenses, permits and allocations.  Specifically, Seller
          shall use its reasonable best efforts to furnish to Buyer the
          following promptly after their receipt by or issuance from Seller:

          All communication to or from any regulatory authority, national,
          foreign or international, which relate to or affect the Space System
          or any approvals, licenses, permits or allocations associated
          therewith.

F.        Buyer agrees not to take any action or enter into any agreement or
          arrangement with a third party that conflicts with Seller's rights
          and obligations under this Contract, or to act or fail to act in any
          manner which would interfere with Seller's aforementioned
          responsibilities.

G.        Notwithstanding any other provision in this Contract, Seller shall at
          all times retain full responsibility for, and all control of the
          Space System and all components thereof, including but not limited to
          the System Control Segment and any other facilities or stations
          licensed by the FCC.

          Furthermore, nothing contained herein shall be interpreted as
          requiring Seller to apply for or obtain the blanket mobile licenses
          to operate subscriber units not the authorizations necessary to
          operate gateways in the United States or any other country.  Although
          Seller or one of its subsidiaries may apply to become a gateway
          operator or service provider for the United States, such action and
          the obtaining of necessary FCC licenses to provide such service,
          shall be accommodated via separate agreements with Buyer as
          appropriate.

H.        Seller agrees that, upon request of Buyer, if the written opinion of
          Seller's legal counsel concludes that Buyer is lawfully qualified to
          hold the approvals, permits and licenses to construct, launch and
          operate the Space System obtained by Seller





                                    Page 21
<PAGE>   25
IRIDIUM Space System Contract

          pursuant to Paragraph A above, Seller will use its best reasonable
          efforts to promptly apply for and obtain appropriate authorization
          from the FCC to transfer such approvals, permits and licenses,
          including any pending applications therefore, at no cost to Buyer
          except for the costs that may result from FCC implementation of an
          auction approach to issuing such permits, licenses, or approvals.
          Neither the appliction to transfer nor the issuance of any license to
          Buyer pursuant thereto shall affect the rights and obligations of the
          parties hereto except the obligations of Seller as provided by
          Paragraphs A, B, and C above, which shall also completely transfer to
          Buyer upon transfer of such approvals, permits and licenses to Buyer.
          In the event the FCC adopts an auction approach to issuing any of the
          permits, licenses or approvals contemplated by this Article, Seller
          and Buyer agree to negotiate in good faith a mutually acceptable
          arrangement with respect to such auctions.

                    ARTICLE 19.  CROSS WAIVER OF LIABILITY.

A.        In the event the U.S. Commercial Space Launch Act of 1984, as
          amended, is applicable to the launch of spacecraft of the
          Constellation, to the extent required thereunder and by any launch
          service provider licensed thereunder, both parties agree to make no
          claims against the other, the contractors and subcontractors of the
          other at any tier (including suppliers of any kind), the officers,
          directors, agents, servants, and employees of the other, or any of
          them, with respect to injury to or death of either party's employees
          involved in, or damaged to either party's property in connection with
          all licensed activities relating to launches of space vehicles of the
          Constellation, except as provided by ARTICLE 20, INDEMNIFICATION.
          Both parties further agree to cause all of their respective
          contractors and subcontractors at any tier (including suppliers of
          any kind) to make no such claims.

B.        Both parties hereby waive and shall cause their contractors and
          subcontractors at any tier (including suppliers of any kind) to waive
          any cause of action in tort against the U.S. government, its agents,
          employees, contractors, and subcontractors to the extent required by
          the U.S. government, and agree to furnish appropriate waivers and
          releases as may be  required to implement this Article in connection
          with the use of U.S. government launch facilities, equipment, or
          required launch support services.

C.        In the event Seller conducts any launch of space vehicles not subject
          to the U.S. Commercial Space Launch Act both parties agree to accede
          to any waiver of claims as may be required pursuant to applicable law
          or as required by any launch service provider.  Seller agrees to keep
          Buyer informed as to the status of negotiations with such launch
          service providers with respect to any such waiver of claims
          provisions that are proposed by launch service providers not subject
          to the U.S.  Commercial Space Launch Act.  Seller further agrees to
          use its best reasonable efforts to negotiate such waiver of claims
          provisions so that they are not any broader than the waivers required
          by the U.S. Commercial Space Launch Act.





                                    Page 22
<PAGE>   26
IRIDIUM Space System Contract

                         ARTICLE 20.  INDEMNIFICATION.

A.        Buyer shall indemnify and hold harmless Seller, its directors,
          officers, agents, subsidiaries, servants, and employees from any
          liabilities, losses and damages including costs, expenses and damages
          incurred by Seller in connection with any and all claims by third
          parties caused by or arising out of the development, operation or use
          of any part of the Space System after passage of title thereto to
          Buyer in accordance with ARTICLE 9, TITLE TRANSFER, except any such
          third party liabilities, losses and damages that are caused by the
          gross negligence or willful misconduct of Seller.  The foregoing
          indemnification shall only apply to the extent such liabilities,
          losses and damages exceed the amounts paid by Seller's launch service
          providers, any governmental indemnification, and the insurance
          obtained by Buyer as provider by ARTICLE 21, INSURANCE.

B.        Seller shall not be liable to Buyer, customers of Buyer or their
          customers for any damages resulting from any loss, destruction,
          degradation or failure of the Space System or its subsystems to
          operate satisfactorily.  Buyer agrees to enter into suitable
          agreements with its customers to effect the foregoing limitation of
          Seller's liability and agrees to indemnify and hold harmless Seller,
          its directors, officers, agents, subsidiaries, servants, contractors
          and employees against the unenforceability of any such limitation or
          Owner's customer's failure to secure such limitation of liability
          provisions in agreements with their customers.

C.        Each party shall indemnify the other for and hold it harmless from
          any liability, loss or damage suffered by the other party resulting
          from the failure of such party to comply with its obligations under
          this Contract to waive or to cause its contractors and subcontractors
          at any tier (including suppliers of any kind) to make no claims under
          this Contract.

                            ARTICLE 21.  INSURANCE.

A.        Seller shall procure and maintain during performance of this Contract
          Worker's Compensation Insurance covering all employees of Seller
          performing any work hereunder in statutory amounts; provided,
          however, that Seller may maintain self-insurance program in lieu of
          Worker's Compensation Insurance if authorized and qualified to do so
          pursuant to statutory authority.

B.        Buyer shall procure and maintain during performance of this Contract,
          at its sole cost and expense, comprehensive general liability
          insurance in an amount no less than $500,000,000 (U.S.) covering
          Buyer's indemnification obligations under ARTICLE 20,
          INDEMNIFICATION, on such terms and conditions and with such insurers
          acceptable to Seller, and, which insurance shall name Seller, its
          contractors and subcontractors as additional insureds.  Buyer shall
          furnish Seller with a waiver of its insurance carrier's rights of
          subrogation, and, with respect to the insurance obligations under
          this Article, such insurance shall also provide that the insurers
          shall give thirty (30) days notice to Seller prior to the effective
          date of cancellation or





                                    Page 23
<PAGE>   27
IRIDIUM Space System Contract

          termination of such insurance.  To the extent insurance is provided
          for Seller's benefit by its launch service provider (s), in
          connection with any third party liability arising from provision of
          the launch services, Seller agrees to use its best efforts to add
          Buyer as an additional insured to such insurance, and in such event,
          the insurance provided herein will be secondary coverage to the
          extent such insurance from Seller's launch service providers (s) and
          any indemnification provided by the U.S. Government, any other
          Government, and any launch service provider covers the same third
          party liability risks.

                        ARTICLE 22.  EXPORT REGULATIONS.

Neither party shall export, directly or indirectly, any information or
technical data disclosed under this Contract to any individual or country which
the U.S. government at the time of export requires an export license or other
government approval without first obtaining such license or approval.  The
parties recognize that Buyer may be comprised of individuals or entities for
which Buyer must ensure no disclosure of technical data unless and until Buyer
obtains appropriate export licenses from the U.S. Government.

                        ARTICLE 23.  DEFAULT BY SELLER.

A.        Buyer may, by written notice of default sent by registered letter to
          Seller, terminate this Contract for cause upon the occurrence of any
          of the following circumstances:

          1.      if Seller fails to make delivery and complete this Contract
                  within twelve (12) months of the scheduled completion date of
                  the final milestone (as may be adjusted under this Contract);
                  or,

          2.      if Seller fails to complete Milestone Number 22 within twelve
                  (12) months of its scheduled completion date (as may be
                  adjusted under this Contract); or,

          3.      if Seller fails to perform any of the other material
                  provisions of this Contract or fails to timely complete one
                  or more of the milestones so as to prevent completion of the
                  Final Milestone of this Contract within twelve (12) months of
                  the scheduled date (as may be adjusted under this Contract)
                  in accordance with its terms as established by clear and
                  convincing evidence, and in either of these two circumstances
                  does not act to commence correction of such failure within a
                  period of thirty (30) days (or such longer period as Buyer
                  may authorize in writing) after receipt of notice from Buyer
                  specifying such failure.

B.        If this Contract is terminated as provided in this Article, Seller
          shall:

          1.      at Buyer's expense, deliver to Buyer all hardware, drawings
                  and other technical data associated with the Space System
                  developed as part of the performance of the completed
                  milestones of the Contract along with appropriate
                  intellectual property licenses to the intellectual property
                  embodied in such hardware, drawings and other technical data
                  to use, make and have made such items to the extent it is
                  permitted to do so by third parties.  The licenses to be
                  granted shall exclude intellectual property rights associated
                  with all manufacturing





                                    Page 24
<PAGE>   28
IRIDIUM Space System Contract

                  process technology, ISU's, MXU's, Gateways and any
                  terrestrial cellular networks and components; and

          2.      at Buyer's expense, protect and preserve property in the
                  possession of Seller in which Buyer has an interest; and,

          3.      be paid the Contract price for all completed milestones; and,

          4.      subject to ARTICLE 26, LIMITATION OF LIABILITY, pay to Buyer
                  all reasonable costs to have this Contract completed by
                  another responsible contractor, to the extent such costs
                  exceed the total amount which Buyer would have had to pay
                  Seller for this Contract had Seller completed the Contract as
                  required; provided, however, that Buyer enters into a
                  Contract with a responsible contractor to complete the
                  terminated effort within one (1) year of notification of
                  termination for default.

          5.      if Seller has not transferred the approvals, permits, and
                  licenses as provided in Paragraph H of ARTICLE 18, PERMITS
                  AND LICENSES, the Seller will continue to operate the System
                  Control Segment Facilities, if completed, (but, not to
                  replace space vehicles in the Constellation or upgrade the
                  hardware or software of the System Control Segment) to permit
                  Buyer time to obtain a successor operator for a period not to
                  exceed thirty (30) days at no cost to Buyer.  Buyer and
                  Seller may agree to extend this thirty day period at a price
                  and on such terms as are mutually acceptable to the parties.

C.        NOTWITHSTANDING ANY PROVISION IN THIS CONTRACT TO THE CONTRARY THE
          REMEDIES SET FORTH IN THIS ARTICLE SHALL BE THE SOLE RECOURSE TO
          WHICH BUYER IS ENTITLED IN THE EVENT OF SELLER'S DEFAULT (I.E.
          BREACH), AND SELLER SHALL HAVE NO LIABILITY FOR SPECIAL, INDIRECT,
          INCIDENTAL OR CONSEQUENTIAL DAMAGES OR FOR LOST PROFITS OR LOST
          REVENUES.

D.        If, after the Buyer gives Seller notice of default it is determined
          for any reason that the Seller was not in default under the
          provisions of this Article, or that the delay was excusable under the
          provisions of ARTICLE 11, EXCUSABLE DELAYS, the rights and
          obligations of the parties shall be the same as if Buyer defaulted in
          the performance of its obligations under this Contract as provided by
          ARTICLE 24, DEFAULT BY BUYER.

                         ARTICLE 24.  DEFAULT BY BUYER.

A.        Seller may, by written notice of default sent by registered letter to
          Buyer, terminate this Contract for cause upon the occurrence of any
          of the following circumstances:

          1.      if Buyer fails to make timely payments as required by Exhibit
                  A and Article 5 herein and does not make any such required
                  payment within five (5) days after notice from Seller; or,





                                    Page 25
<PAGE>   29
IRIDIUM Space System Contract


          2.      if Buyer fails to perform any other obligation which it is
                  required to perform pursuant to this Contract and Buyer does
                  not act to commence correction of such failure within (30)
                  days after notice of such failure is received from Seller.

B.        If this Contract is terminated pursuant to this Article, Buyer shall:

          1.      pay to Seller, the full amounts of anticipated and reasonable
                  profits Seller could have earned had it been permitted to
                  complete this Contract; and,

          2.      assign to Seller all licenses of Buyer to use frequency
                  allocations in any country to the fullest extent permitted by
                  law; and,

          3.      return to Seller all documentation and technical data
                  previously delivered to Buyer by Seller; and,

          4.      pay to Seller the portion of the prices for all partially
                  completed milestones based upon actual work performed by
                  Seller towards completion of such milestones; and,

          5.      pay to Seller all of Seller's cost of stopping the work under
                  the Contract including its costs or terminating subcontracts
                  and purchase commitments; and,

          6.      immediately pay to Seller all payments for milestones
                  completed on or before the date of such default by Buyer as
                  provided by Exhibit A.

C.        THE REMEDIES SET FORTH IN THIS ARTICLE SHALL BE THE SOLE RECOURSE TO
          WHICH SELLER IS ENTITLED IN THE EVENT OF BUYER'S DEFAULT, AND EXCEPT
          AS PROVIDED ABOVE, BUYER SHALL HAVE NO LIABILITY FOR SPECIAL,
          INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR FOR LOST PROFITS OR
          LOST REVENUES.

                   ARTICLE 25.  TERMINATION FOR CONVENIENCE.

A.        Except as specifically provided by this Article, this Contract may
          not be terminated by either party for its own convenience and without
          cause.  Terminations for Cause shall be governed by ARTICLE 23,
          DEFAULT BY SELLER and ARTICLE 24, DEFAULT BY BUYER above.

B.        Buyer may terminate this Contract at any time without reason or cause
          by providing written notice of such termination to Seller.  In the
          event Buyer issues such a termination notification to Seller, this
          Contract shall terminate effective upon receipt of such notice by
          Seller.  Upon such termination, the parties shall have the follow
          rights and responsibilities and shall undertake to discharge them in
          a prompt manner:

          1.      Seller's Rights and Responsibilities:

                  a.       Seller shall be entitled to received, from Buyer:
                           full payment for all milestones completed on or
                           prior to the effective date of such termination;





                                    Page 26
<PAGE>   30
IRIDIUM Space System Contract

                           the portion of the prices for all partially
                           completed milestones based upon the actual work
                           performed toward completion of such milestones
                           through the effective date of such termination;
                           Seller's costs of stopping all work under this
                           Contract including its costs of terminating all
                           subcontracts and purchase commitments; and, a fair
                           and reasonable profit based upon the foregoing
                           items.  Buyer shall pay Seller such amounts within
                           thirty (30) days after receipt of Seller's invoice
                           therefor.

                  b.       Seller shall be relieved of all other obligations
                           contained in this Contract except for its obligation
                           to not use or disclose Buyer's proprietary
                           information except in accordance with ARTICLE 27,
                           DISCLOSURE AND USE OF INFORMATION BY PARTIES.

          2.      Buyer's Rights and Responsibilities:

                  a.       Buyer shall pay Seller: the full payment for all
                           milestones completed on or prior to the effective
                           date of such termination; the portion of the prices
                           for all partially completed milestones based upon
                           the actual work performed toward completion of such
                           milestones through the effective date of such
                           termination; Seller's costs of stopping all work
                           under this Contract including its costs or
                           terminating all subcontracts and purchase
                           commitments; and, a fair and reasonable profit based
                           upon the foregoing items.  Buyer shall pay seller
                           such amounts within thirty (30) days after receipt
                           of Seller's invoice (s) therefor.

                  b.       Buyer shall be relieved of all other obligations
                           contained in this Contract except for its obligation
                           to not disclose or use the Seller's proprietary
                           information except in accordance with ARTICLE 27,
                           DISCLOSURE AND USE OF INFORMATION BY PARTIES.

                     ARTICLE 26.  LIMITATION OF LIABILITY.

A.        IN NO EVENT SHALL SELLER BE LIABLE, WHETHER IN CONTRACT, TORT OR
          OTHERWISE, FOR SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL
          DAMAGES, INCLUDING WITHOUT LIMITATION LOST PROFIT OR REVENUES.

B.        FURTHERMORE, IN NO EVENT AND UNDER NO CIRCUMSTANCES SHALL SELLER BE
          LIABLE TO BUYER IN AN AMOUNT IN EXCESS OF $100,000,000 (U.S.) FOR ANY
          AND ALL COSTS, DAMAGES, CLAIMS OR LOSSES WHATSOEVER ARISING OUT OF OR
          RELATED TO THIS CONTRACT OR ANY OTHER CONTRACT REFERRED TO IN ARTICLE
          30 HEREOF OR EXECUTED BETWEEN BUYER AND SELLER IN CONNECTION WITH THE
          IRIDIUM COMMUNICATIONS SYSTEM, OR ANY PROVISION HEREUNDER OR
          THEREUNDER WHETHER PURSUED AS A BREACH (I.E. DEFAULT) OF THE CONTRACT
          OR AS A TORT OR OTHER CAUSE OF ACTION AND WHETHER ACCRUING BEFORE OR
          AFTER COMPLETION OF ALL THE WORK REQUIRED TO BE PERFORMED UNDER THIS
          CONTRACT.





                                    Page 27
<PAGE>   31
IRIDIUM Space System Contract


        ARTICLE 27.  DISCLOSURE AND USE OF INFORMATION BY THE PARTIES.

A.        "Proprietary Information" is defined as information which the
          disclosing party at the time of disclosure identifies in writing as
          Proprietary Information by means of a proprietary legend, marking,
          stamp or other positive written notice identifying the information to
          be proprietary.  In order for information disclosed orally or
          visually by a party to this Contract to be Proprietary Information
          protected hereunder, the disclosing party shall identify the
          information as proprietary at the time of the disclosure and, within
          thirty (30) days after such oral or visual disclosure, reduce the
          subject matter of the disclosure to writing, properly stamped with
          the proprietary legend, marking, stamp or other positive written
          notice and submit it to the receiving party.

B.        Except as may be specifically provided otherwise in this Contract,
          Proprietary Information of Seller disclosed hereunder to Buyer may
          only be used by Buyer for monitoring the progress of the performance
          of this Contract by Seller.

C.        Except as may be specifically provided otherwise in this Contract,
          Proprietary Information of Buyer disclosed hereunder to Seller may
          only be used by Seller in performance of the work specified in this
          Contract.

D.        It is agreed that for a period of ten (10) years following the
          receipt of Proprietary Information, the receiving party will use such
          information only for the purpose(s) provided in Paragraphs B and C
          above as applicable and shall take reasonable efforts to preserve in
          confidence such Proprietary Information and prevent disclosure
          thereof to third parties.  Each of the parties agree that it will use
          the same reasonable efforts to protect the other's Proprietary
          Information as are used to protect its own but will at least use
          reasonable care.  Disclosures of such information shall be restricted
          to those individuals directly participating in the efforts provided
          in Paragraphs B and C above who have a need to know such information,
          and, who have been made aware of and consent to abide by the
          restrictions contained herein concerning the use of such information.

E.        The obligation to protect Proprietary Information, and the liability
          for unauthorized disclosure or use of Proprietary Information, shall
          not apply with respect to such information which is now available or
          becomes available to the public without breach of this Contract;
          information lawfully received without restrictions from other
          sources; information known to the receiving party prior to disclosure
          not subject to a separate non-disclosure obligation; information
          published or disclosed by the disclosing party to others, without
          restriction; information developed by the receiving party independent
          of and without use of the information disclosed by the disclosing
          party; or, information for which further use of disclosure by the
          recipient is authorized in writing by the disclosing party; or
          information required to be disclosed to any persons involved in
          insuring risks hereunder.

                  ARTICLE 28.  PUBLIC RELEASE OF INFORMATION.

Except as otherwise provided by ARTICLE 27, DISCLOSURE AND USE OF INFORMATION
BY THE PARTIES, during the term of this Contract, either party, its





                                    Page 28
<PAGE>   32
IRIDIUM Space System Contract

affiliates, subcontractors, employees, agents and consultants may release items
of publicity of any kind, including, without limitation, news releases,
articles, brochures, advertisements, prepared speeches, external company
reports or other information releases, related to the work performed hereunder,
including the denial or confirmation thereof.  Each party shall provide a copy
of such publicity items to the other and shall endeavor to provide such copies
prior to their actual release to the public.  Notwithstanding the foregoing,
however, neither party may disclose the specific terms and conditions of this
Contract without the prior approval of the other party except for such
disclosures required by law or as a part of the Private Placement Memorandum
issuance.

                            ARTICLE 29.  ASSIGNMENT.

Neither party shall assign or delegate this Contract or any of its rights,
duties, or obligations thereunder to any other person without the prior express
written approval of the other party except that Buyer agrees that Seller may
assign this Contract to any subsidiary or successor corporation of Seller.
Nothing contained in this Article shall restrict Seller from subcontracting
work or procuring parts/materials or services in the ordinary course of
performance of this Contract; nor shall it restrict Buyer from assigning any
right, title or interest it may have in any items delivered by Seller
hereunder, solely to secure financing for the IRIDIUM Communications System.

                ARTICLE 30.  RELATIONSHIP WITH OTHER AGREEMENTS.

The following agreements executed simultaneously on or after this Contract
relate to the effort described herein.  The rights and responsibilities of the
parties within each of these related agreements is set forth within each such
separate and independent agreement.

A.        OPERATIONS AND MAINTENANCE CONTRACT:  The Operations and Maintenance
          Contract (O&M Contract) covers the operation and maintenance of the
          entire IRIDIUM Space System and the network management associated
          with the gateways.  The five (5) year period contemplated by the O&M
          Contract begins immediately upon completion of this IRIDIUM Space
          System Contract.  Generally the work required includes the
          replacement of individual spacecraft of the Constellation as
          necessary to maintain the performance and reliability levels
          specified for the Space System.  This Contract, however, does not
          include the development, sale, operation or maintenance of the
          gateways themselves.

B.        ENGINEERING ASSISTANCE AGREEMENT:  This contract is intended to
          provide engineering assistance and other services by Seller to Buyer
          in excess of the effort included in the scope of the O&M Agreement
          and this Space System Contract.  Such services could include the
          system engineering design assistance in evaluating the utility of an
          enhanced design for the second or replacement Space System.





                                    Page 29
<PAGE>   33
IRIDIUM Space System Contract

                       ARTICLE 31.  SALE OF OTHER SYSTEMS

Subject to Buyer's complete and timely performance of all of its obligations
hereunder, Seller agrees not to produce for itself or others a similar
satellite-based space system of a global communication system for commercial
use without Buyer's prior written approval.  This obligation shall cease as of
July 31, 2003 or the termination date of this contract, whichever is earlier.
This obligation, however, shall not be construed to prohibit Seller from
designing, developing, or selling a similar space-based non-global commercial
system,  a non-commercial communications system, a commercial non-communication
system, nor a space-based communication system to the United States or other
governmental body in any country for military or defense communication
purposes, nor individual spacecraft for any purpose.

                             ARTICLE 32.  NOTICES.

All correspondence, including notices, reports and documentation deliverables,
to be provided to Buyer or Seller under this Contract shall be sent to Buyer or
Seller as follows:

<TABLE>
<S>              <C>                            <C>              <C>
Buyer:           Iridium LLC                    Seller:          Motorola, Inc.


Address:         1401 H Street N.W.             Address:         2501 S. Price Rd.
                 Suite 800                                       Chandler, AZ 85248
                 Washington, DC 20005


Attn:            Robert R. Call                 Attn:            Walter R. Rhodes
                 Director, Commercial                            Director, Contractual
                 Relations                                       Alliances
                                                                 Satellite Communications
                                                                 M/D/G1214


Phone:           (202) 362-5648                 Phone:           (602) 732-2634
FAX:             (202) 842-0006                 FAX:             (602) 732-2542
</TABLE>

                    ARTICLE 33.  AUTHORIZED REPRESENTATIVES.

The only representatives of Buyer and Seller authorized to make changes to this
Contract and to sign contractual documents are:

          Buyer:                                   Seller:

          Edward F. Staiano                        Durrell L. Hillis
          F. Thomas Tuttle                         Bary Bertiger
                                                   Mark Borota

Either party may change its aforementioned representatives at any time by
providing written notice to the other party.





                                    Page 30
<PAGE>   34
IRIDIUM Space System Contract

                             ARTICLE 34.  EXHIBITS.

The following Exhibits are attached hereto and hereby incorporated as part of
this Contract by reference as if fully set forth within this Contract:

          Exhibit A - Milestone Performance and Payment Schedules
          Exhibit B - Statement of Work
          Exhibit C - Acceptance Plan

                       ARTICLE 35.  ORDER OF PRECEDENCE.

In the event of any inconsistency among or between the parts of this Contract,
such inconsistency shall be resolved by giving precedence in the order of the
parts as set forth below:

          1.  Contract Articles
          2.  Milestone Performance and Payment Schedules (Exhibit A)
          3.  Acceptance Plan (Exhibit C)
          4.  Statement of Work (Exhibit B)
          5.  Other contracts or documents referred to in any of the preceding 
              parts of this Contract.

                          ARTICLE 36.  APPLICABLE LAW.

This Contract and any dispute arising under or in connection with this
Contract, including any action in tort, shall be construed in accordance with
and governed by the laws of the State of Arizona except for its choice of laws
rules.  Venue for any dispute not resolved by the parties shall be in Arizona
except for its choice of laws rules.

Seller and Buyer will attempt to settle any claim or controversy arising out of
it through consultation and negotiation in good faith and a spirit of mutual
cooperation.  If those attempts fail, then the dispute will be mediated by a
mutually-acceptable mediator to be chosen by Seller and Buyer within forty-five
(45) days after written notice by one of us demanding mediation.  Neither party
may unreasonably withhold consent to the selection of a mediator, and Seller
and Buyer will share the costs of the mediation equally.  By mutual agreement,
however, the parties may postpone mediation until they have each completed some
specified but limited discovery about the dispute.  The parties may also agree
to replace mediation with some other form of alternative dispute resolution
(ADR), such as neutral fact-finding or a minitrial.

Any dispute which is not resolved by the parties through negotiation, mediation
or other form of ADR within six (6) months of the date of the initial demand
for it by either party, may then be submitted to the courts within Arizona for
resolution.  The use of any ADR procedures will not be construed under the
doctrines of laches, waiver or estoppel to affect





                                    Page 31
<PAGE>   35
IRIDIUM Space System Contract

adversely the rights of either party.  And nothing in this section will prevent
either party from resorting to judicial proceedings if (a) good faith efforts
to resolve the dispute under these procedures have been unsuccessful or (b)
interim relief from a court is necessary to prevent serious and irreparable
injury to one party or to others.

                         ARTICLE 37.  ENTIRE AGREEMENT.

This Contract constitutes the entire agreement between the parties and
supersedes all prior understandings, commitments, and representations with
respect to the subject matter including the IRIDIUM Space System Contract
signed by the parties on September 11, 1991 which is now null and void.  This
Contract may not be amended or modified except as provided by ARTICLE 10,
CHANGES; nor may it be terminated except as provied by ARTICLE 23 OR 24; and
none of its provisions may be waived, except by a writing signed by an
authorized representative of the party against which the waiver is sought to be
enforced.  The paragraph headings herein shall not be considered in
interpreting the text of this Contract.  In the event any part of this Contract
is declared legally invalid or unenforceable by an authorized judicial body,
such part of this Contract shall be ineffective to the extent of such
invalidity or unenforceability and shall not affect the remaining provisions of
this Contract unless such declaration affects ARTICLE 20, INDEMNIFICATION, or
ARTICLE 26, LIMITATION OF LIABILITY.  In such case, this Contract shall be
declared terminated as of the date of such judicial decision and the parties
shall have only the following rights and responsibilities:

1.        Seller's Rights and Responsibilities:
          a.      Seller shall be entitled to have received all payments for
                  completed milestones due in accordance with Exhibit A, as of
                  the termination date; and,
          b.      Seller shall be relieved of all other obligations contained
                  in this Contract except for its obligation to not use or
                  disclose Seller's proprietary information except in
                  accordance with ARTICLE 27, DISCLOSURE AND USE OF INFORMATION
                  BY PARTIES.

2.        Buyer's Rights and Responsibilities:
          a.      Buyer shall pay Seller all payments for completed milestones
                  in accordance with the Payment Schedule as of the termination
                  date, but shall be relieved of any further payment
                  obligations under this Contract after the termination date;
                  and,
          b.      Buyer shall be relieved of all other obligations contained in
                  this Contract except for its obligation to not use or diclose
                  Seller's proprietary information except in accordance with
                  ARTICLE 27, DISCLOSURE AND USE OF INFORMATION BY PARTIES.





                                    Page 32
<PAGE>   36
IRIDIUM Space System Contract

                          ARTICLE 38.  EFFECTIVE DATE.

The term Effective Date of this Contract (EDC), as used in this Contract shall
mean the 29th day of July, 1993.

IN WITNESS WHEREOF, the parties hereto have executed this Contract consisting
of this and the preceding 32 pages and the Exhibits referenced therein.

MOTOROLA, INC.                                IRIDIUM LLC
- --------------                                -----------

By:  /s/ BARRY BERTIGER               By:  /s/ JERROLD D. ADAMS
   -------------------------------       ------------------------------

Name:  Barry Bertiger                 Name:  Jerrold D. Adams
     -----------------------------         ----------------------------

       Corporate Vice President              President and Chief 
Title:   and General Manager          Title:   Operating Officer
      ----------------------------          ---------------------------

Date:                                 Date:
     -----------------------------         -----------------------------





                                    Page 33
<PAGE>   37
IRIDIUM Space System Contract

                                   EXHIBIT A

<TABLE>
<CAPTION>
Milestone                                                        Scheduled                 $ Amount Due
Number                         Description*                  Completion Date**            (U.S. Dollars)  
- --------                       ------------                  -----------------          ------------------
<S>            <C>                                                <C>                     <C>             
N/A            Down Payment (1st increment)                       07/29/93                $   75,000,000  
                                                                                          --------------  
                                                                                                          
N/A            Down Payment (2nd increment)                       09/29/93                $  100,000,000  
                                                                                          --------------  
                                                                                                          
N/A            Down Payment (3rd increment)                       11/29/93                $  100,000,000  
                                                                                          --------------  
                                                                                                          
1              Main Mission Antenna PDR (5.1)                     01/29/94                $   20,000,000  
                                                                                          --------------  
                                                                                                          
2              Communications Module PDR (5.2)                    02/28/94                $   20,000,000  
                                                                                          --------------  
                                                                                                          
3              Space Vehicle Manufacturing Plan                   03/29/94                $   20,000,000  
               (5.3)                                                                      --------------  
                                                                                                          
4              Earth Terminal SCS PDR (5.4)                       04/29/94                $   20,000,000  
                                                                                          --------------  
                                                                                                          
5              Earth Terminal Controller SCS PDR (5.5)            05/29/94                $   20,000,000  
                                                                                          --------------  
                                                                                                          
6              System Control Segment PDR (5.6)                   07/29/94                $   21,000,000  
                                                                                          --------------  
                                                                                                          
7              Earth Terminal SCS CDR (5.7)                       08/29/94                $   50,000,000  
                                                                                          --------------  
                                                                                                          
8              Earth Terminal Controller SCS CDR (5.8)            09/29/94                $   50,000,000  
                                                                                          --------------  
                                                                                                          
9              Communications Module CDR (5.9)                    10/29/94                $   50,000,000  
                                                                                          --------------  
                                                                                                          
10             System Control Segment CDR (5.10)                  11/29/94                $   50,000,000  
                                                                                          --------------  
                                                                                                          
11             Main Mission Antenna CDR (5.11)                    12/29/94                $   50,000,000  
                                                                                          --------------  
                                                                                                          
12             Space System CDR (5.12)                            01/29/95                $   65,000,000  
                                                                                          --------------  
                                                                                                          
13             SCC Construction Complete (5.13)                   02/28/95                $   70,000,000  
                                                                                          --------------  
                                                                                                          
14             Space Vehicle Test Plan (5.14)                     03/29/95                $   80,000,000  
                                                                                          --------------  
                                                                                                          
15             Space System Ops Plan (5.15)                       04/29/95                $   80,000,000  
                                                                                          --------------  
                                                                                                          
16             Main Mission Antenna Qual Model Test               05/29/95                $   87,000,000  
               (5.16)                                                                     --------------  
                                                                                                          
17             Space Vehicle Bus Qual Test Complete               07/29/95                $   80,000,000  
               (5.17)                                                                     --------------  
</TABLE>





                                    Page 34
<PAGE>   38
IRIDIUM Space System Contract

<TABLE>
<CAPTION>
Milestone                                                        Scheduled                 $ Amount Due
Number                         Description*                  Completion Date**            (U.S. Dollars)  
- --------                       ------------                  -----------------          ------------------
<S>            <C>                                               <C>                      <C>             
18             Space Vehicle Qual Model Assembly Complete        08/29/95                 $   80,000,000  
               (5.18)                                                                     --------------  
                                                                                                          
19             Space System DT&E Test Readiness Review           10/29/95                 $   80,000,000  
               (5.19)                                                                     --------------  
                                                                                                          
20             Space Vehicle Supplier PRR (5.20)                 11/29/95                 $   90,000,000  
                                                                                          --------------  
                                                                                                          
21             SCC Ready For OT&E Test (5.21)                    12/29/95                 $   90,000,000  
                                                                                          --------------  
                                                                                                          
22             Space Vehicle Qual Test (5.22)                    01/29/96                 $   90,000,000  
                                                                                          --------------  
                                                                                                          
23             TTAC West Construction Complete (5.23)            02/29/96                 $   90,000,000  
                                                                                          --------------  
                                                                                                          
24             Space System Multiple SV DT&E Test Report         05/29/96                 $  106,000,000  
               (5.24)                                                                     --------------  
                                                                                                          
25             SCC and TTAC Integration & Test (OTE)             07/29/96                 $  100,000,000  
               Complete (5.25)                                                            --------------  
                                                                                                          
26             SCC and TTAC Ready To Support First Launch        09/29/96                 $  100,000,000  
               (5.26)                                                                     --------------  
                                                                                                          
27             Preliminary Satellite Subscriber Unit             10/29/95                 $            0  
               Interface Specification (5.27)                                             --------------  
                                                                                                          
28             Space System OT&E Test Readiness Review           11/29/96                 $  100,000,000  
               (5.28)                                                                     --------------  
                                                                                                          
29             ATP Procedures (5.29)                             12/29/96                 $  100,000,000  
                                                                                          --------------  
                                                                                                          
30             Initial Launch (5.30)                             01/29/97                 $  100,000,000  
                                                                                          --------------  
                                                                                                          
31             Initial Launch Test Data Report (5.31)            03/29/97                 $  100,000,000  
                                                                                          --------------  
                                                                                                          
32             Step I of Table 3.7.1 (5.32)                      04/29/97                 $   75,000,000  
                                                                                          --------------  
                                                                                                          
33             Final Test Report (Launch #1) (5.33)              05/29/97                 $   82,000,000  
                                                                                          --------------  
                                                                                                          
34             Step II of Table 3.7.1 (5.34)                     07/29/97                 $   75,000,000  
                                                                                          --------------  
                                                                                                          
35             Step III of Table 3.7.1 (5.35)                    08/29/97                 $   70,000,000  
                                                                                          --------------  
</TABLE>





                                    Page 35
<PAGE>   39
IRIDIUM Space System Contract

<TABLE>
<CAPTION>
Milestone                                                        Scheduled                 $ Amount Due
Number                         Description*                  Completion Date**            (U.S. Dollars)  
- --------                       ------------                  -----------------          ------------------
<S>            <C>                                               <C>                      <C>            
36             MCF Construction Complete (5.36)                  09/29/97                 $   50,000,000 
                                                                                          -------------- 
                                                                                                         
37             Satellite Subscriber Unit Interface               10/29/96                 $  150,000,000 
               Specification (5.37)                                                       -------------- 
                                                                                                         
38             Space Node Test Report (5.38)                     11/29/97                 $   25,000,000 
                                                                                          -------------- 
                                                                                                         
39             Step IV of Table 3.7.1 (5.39)                     12/29/97                 $   75,000,000 
                                                                                          -------------- 
                                                                                                         
40             BCF Integration & Test Complete (5.40)            01/29/98                 $   25,000,000 
                                                                                          -------------- 
                                                                                                         
41             MCF Integration & Test Complete (5.41)            02/28/98                 $   25,000,000 
                                                                                          -------------- 
                                                                                                         
42             Step V of Table 3.7.1 (5.42)                      03/29/98                 $   75,000,000 
                                                                                          -------------- 
                                                                                                         
43             BCF Fully Operational (5.43)                      05/29/98                 $   44,000,000 
                                                                                          -------------- 
                                                                                                         
44             Step VI of Table 3.7.1 (5.44)                     06/29/98                 $   75,000,000 
                                                                                          -------------- 
                                                                                                         
45             SCS Fully Operational (5.45)                      07/29/98                 $   45,000,000 
                                                                                          -------------- 
                                                                                                         
46             Step VII of Table 3.7.1 (5.46)                    08/29/98                 $   75,000,000 
                                                                                          -------------- 
                                                                                                         
47             Completion of Test Plan (FOC) (5.47)              09/23/98                 $  150,000,000 
                                                                                          -------------- 
</TABLE>

* Except as specified otherwise, the paragraph referenced in parenthesis beside
the description of each milestone refers to the applicable provision of the
Statement of Work, Exhibit B.

** The dates shown in the column titled "Scheduled Completion Date" are those
dates as of the Effective Date of this Contract and are subject to adjustment
as provided by ARTICLE 11, EXCUSABLE DELAYS, of the Contract.





                                    Page 36
<PAGE>   40
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


1.0 SCOPE

    This Statement of Work (SOW) describes the specific effort associated with
    the Space System Contract.  This effort includes only the following items:

    1)   Design, Development, Production, Construction, and all work necessary
         to Deliver the Space System as described in the Milestones specified
         in Section 5 of this SOW.  The specifications for the Design of the
         Constellation are provided in Section 3 of this SOW.  The
         specifications for the Design of the System Control Segment are
         provided in Section 4 of this SOW.

    2)   Development and Delivery of the Space Systems Operations Plan that
         will define the plan for the operation and control of the IRIDIUM
         Communications System.

    3)   Design, Development, and Delivery of the Satellite Subscriber Unit
         (Voice) Interface Specification; and design, development, and
         availability of the Mobile Exchange Unit (MXU) Interface
         Specification, Gateway Interface Specification, and Paging Unit
         Interface Specification.

    4)   Operation of the Space System in accordance with the Space System
         Operations Plan.  Concurrently, seller will begin collecting data for
         and reporting Average Actual Service Provided as described in
         Statement of Work Exhibit B, Section 6 commencing 90 days prior to
         anticipated Full Operational Capability (FOC) or at a mutually agreed
         upon date.

    To the extent the Space System Contract specifications require the Space
    System to have the capability of a specific performance characteristic
    unless the specifications provide a specific magnitude of capability, the
    Seller's determination of the magnitude of the Space System's capability of
    such performance characteristic shall be conclusive and final.

    To facilitate the reader's understanding of the requirements presented in
    this document, explanatory notes are provided where appropriate.  These
    notes are not requirements, but are intended to provide additional
    information and/or background rationale.  Such data is presented in an
    italic type font.

2.0 GENERAL

    The IRIDIUM Space System is a constellation of satellites and its
    associated control elements primarily intended to provide commercial,
    mobile voice and subscriber data service via IRIDIUM Subscriber Units to
    subscribers throughout the world.  It is composed of a Space Segment and a
    System Control Segment (SCS).  The Space System provides IRIDIUM services
    in conjunction with a Gateway Segment and a Subscriber Unit Segment which
    are specified elsewhere.





                                     Page 1
<PAGE>   41
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


    The Space System provides a worldwide communications service for voice and
    subscriber data between any two IRIDIUM Subscriber Units (ISUs) as well as
    between any IRIDIUM Subscriber Unit and a local PTT (Postal, Telegraph and
    Telephone) customer.

    This worldwide personal communications service is designed to support
    portable, low power subscriber units through the use of a constellation of
    small satellites in low earth polar orbits.  The satellites are networked
    together to form a system which provides continuous line-of-sight (LOS)
    communications between the IRIDIUM System and any point within
    approximately 30 km of the earth's surface.

    The Space System is composed of the Constellation of satellites, the system
    control facilities, and the communications links which interconnect these
    elements.  Additionally, Gateways operated by private owners play a vital
    role in the provision of communications services to subscribers.

    To support service between ISUs and local PTT customers the Gateways
    provide the interface with the Public Switched Telephone Networks (PSTN) of
    the host countries PTTs. Each ISU is recorded in a home location register
    which maintains its last known location and registration/service records
    used for subscriber validation prior to placement of a call.  This Gateway
    interfaces with the ISU's billing service.  The Gateway also contains a
    visitor location register which maintains a record of all ISUs currently in
    its service area regardless of where they are registered.  Subject to
    possible government restrictions, an ISU may be carried and used to
    communicate anywhere in the world.

    IRIDIUM Space Vehicles will be launched by Expendable Launch Vehicles
    (ELV).  During launch operations, status of both the Launch Vehicle and the
    Space Vehicle(s) are monitored by the launch control facility.  The Launch
    Vehicle will place the Space Vehicle in a parking orbit, in which the SV
    deploys its solar panels and antennas.

    Following the Space Vehicle's separation from the Launch Vehicle, control
    of the Space Vehicle will be handed over to the SCS.  After computing the
    transfer maneuvers required to move the Space Vehicle from the actual
    parking orbit attained to its mission orbit, the SCS will generate and
    transmit the commands which will implement the maneuvers.

    The SCS monitors and controls all elements of the Space System.  It
    receives and processes health and status telemetry data from all IRIDIUM
    Space Vehicles, status data from each Gateway, and call loading data for
    each node and link in the Network.

    The SCS has a communications link with the launch control facility to
    obtain the data necessary to initially acquire the SV.  The SCS monitors
    the Space Vehicle as it leaves its parking orbit and acquires its mission
    orbit.  Until the Space Vehicle is fully operational, communications with
    the Space Vehicle will utilize a secondary communications subsystem rather
    than the primary feeder links.  Once the Space Vehicle has completed the
    deployment sequence, the feeder links between it and the Gateways and other
    Space Vehicles may be established.





                                     Page 2
<PAGE>   42
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

    Prior to turning the Space Vehicle over for the IRIDIUM Mission Operations,
    a full set of on orbit tests are run to validate operational readiness.
    These tests exercise all systems required for successful operation of the
    Space Vehicle and all functions used in Mission Operations.  The SCS will
    provide the command functions required for maintaining control of the
    IRIDIUM Constellation.

    When a Space Vehicle is no longer able to support mission operations,
    either because it has reached the end of its expendables or because of
    equipment degradation/failure, it will be commanded to de-boost by the SCS
    and the Constellation reconstituted with a replacement Space Vehicle.  In
    the case where all normal communications have failed, the SV secondary
    communications subsystem will be used to safely de-boost the Space Vehicle
    using a stored command sequence which is initiated by the SCS.

    The command and control of the Space System is driven by two operations
    planning functions: on-line routine traffic loading projections to identify
    potential problems and off-line predictions of "what-if" responses to
    perturbations.  The on-line planning routinely projects performance forward
    in time, notifying operators when potential problems are foreseen.  The
    off-line planning tools are used by network operators to choose the best
    times to perform required reconfigurations and design automatic system
    responses to unanticipated failures.  The SCS will also have analysis tools
    which allow operators to design and execute reconfiguration commands to
    mitigate or eliminate anticipated future problems and to analyze the impact
    of expanded capacity and/or increased capability.

    An ISU-to-ISU call is used as an example to describe the process of placing
    an IRIDIUM call.  In this example, ISU 1 (which is already registered)
    calls ISU 2 and both units are initially in the STANDBY Mode, i.e., they
    have both reported their current location to the System and are ready to
    send or receive a call.  ISU 1 is at its registered location, "Home", on a
    private island in the Caribbean while ISU 2 is a portable unit currently
    away from its London "Home" on a ranch in the Andean foothills of
    Argentina.  Although locations have been assumed for purposes of this
    example, both units could be located anywhere on the earth's surface either
    in or out of their Home areas and there would be no difference in the
    scenario described.

    To initiate the call, Subscriber 1 enters ISU 2's IRIDIUM phone number via
    the ISU's key pad and presses "send" to access the network.  ISU 1 then
    automatically uploads its own phone and registration numbers as well as the
    number being called.  The Space Vehicle sends the information received from
    ISU 1 to its home Gateway.  This Gateway is the controlling Gateway for the
    call.  The Gateway determines that the called party is an ISU and uses its
    visitor location register to validate ISU registration.  In contacting the
    England Gateway, it determines that ISU 2's registration is valid and that
    its last known location is in Argentina.  Since both units' registrations
    were successfully validated, call placement continues.  ISU 2's last known
    location is relayed via the network to the controlling Gateway which
    determines the initial destination.  A ring alert is sent to ISU 2.  When
    ISU 2 is answered, an acknowledgement signal is sent through the network,
    the channel is totally engaged and the conversation occurs, i.e., the call
    enters a "steady state" mode.  When the call is disconnected, the caller,





                                     Page 3
<PAGE>   43
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

    destination, and start and stop times of the call are relayed (call image)
    by the controlling Gateway to both home location registers and output by
    their respective Gateways to the appropriate billing entity.  The call is
    also included in the billing summary sent by the Servicing Gateway to the
    SCS.

    If the called ISU is not near its last known location, that is, it does not
    respond to the ring-alert at its last known location, a limited area
    ring-alert is performed.  If there is still no response, a message is
    transmitted to the calling party informing them that the called party has
    not responded.

    The procedure is basically the same if a PTT customer is at one end of the
    call instead of an ISU, but involves the Gateway servicing that PTT.

    Because the IRIDIUM antenna beams projected onto the earth by the Space
    Vehicles in the IRIDIUM Constellation move rapidly relative to the
    subscribers, calls may be handed off from antenna beam-to-antenna beam and
    from SV-to-SV during a call.  Handoff is transparent to the subscribers at
    both ends of the call and may be performed several times during a normal
    call.

2.2 FUNCTIONAL DESCRIPTION

    The Space System consists of the Constellation, or Space Segment and its
    associated control element, the System Control Segment.  There are also
    Gateway and Subscriber segments being developed to support the Space
    System.  Each segment is briefly described in the following sections.

    2.2.1 SPACE SEGMENT

          The IRIDIUM Space Segment is defined to be multiple units of a
          satellite design which will populate the IRIDIUM Constellation.  Each
          Space Vehicle is a network node orbiting the earth in a circular
          polar orbit.  Each SV is a three-axis stabilized satellite which
          integrates the structure and subsystems required to perform IRIDIUM
          space-based communications routing and control functions, maintain
          Space Vehicle operations and provide communications service for the
          ISUs.

          Each Space Vehicle includes a nadir pointing subscriber-link main
          mission antenna subsystem, feeder-link Gateway/SCS and crosslink
          antenna subsystems, a secondary, omni-directional, communications
          subsystem and associated communications electronics.  The main
          mission antenna (MMA) communicates directly with the ISUs.  The
          Gateway/SCS and crosslink antennas of each Space Vehicle provide the
          capability to communicate with Gateway/SCS facilities within its
          field of view and neighboring Space Vehicles, respectively.





                                     Page 4
<PAGE>   44
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

    2.2.2 GATEWAY SEGMENT

               Each gateway is defined to be a node in the network.  The
          Gateway Segment is defined to be the collection of gateway nodes.  A
          gateway communicates with ISUs, other gateways and the SCS via the
          Constellation and is the System's interface to the local PSTN.
          Secondarily, it communicates with the SCS via existing commercial
          communications links.

          The gateway determines the initial routing cues for all calls
          originating in the local PTTs that it services and by ISUs, home or
          visiting, which it is currently servicing.  Each gateway maintains
          call detail records and registration information for all ISUs
          assigned to it, i.e., for all ISUs contained in its home location
          register.  For each call involving one of its assigned ISUs, it
          either directly verifies ISU registration or sends registration
          information to the Gateway controlling the call, and it records all
          pertinent call detail data.  It supplies this data to the appropriate
          billing office and summary data to the SCS.

          Each gateway has a minimum of two antennas; one operates with the
          Space Vehicle with which it is currently communicating, while the
          other establishes the link to the next Space Vehicle with which it
          will communicate.

    2.2.3 SYSTEM CONTROL SEGMENT

          The System Control Segment is defined to consist of a Master Control
          Facility, a Backup Control Facility, and Telemetry, Tracking and
          Command (TTAC) sites.  The SCS monitors, manages and controls all
          elements of the Space System.  The primary linkage between the SCS,
          the Constellation, and gateways is via the feeder link network.  A
          secondary linkage to each gateway exists via existing commercial
          communication links.  The SCS tests all network links and
          reconfigures the network as necessary.  The SCS components will be
          placed in geographic locations determined appropriate by Motorola. As
          of the effective date of this contract, Motorola plans to locate the
          MCF in the United States and the BCF in Italy subject to all
          necessary governmental authorizations and acceptable contract
          negotiation results.  During initial deployment of the Constellation
          and until necessary components of the SCS become operational, the
          functions of the MCF will be performed by the SATCOM Control Center
          (SCC).

               The SCS receives each SV's telemetry and provides the commands
          required for maintaining control of the Constellation.  The SCS
          monitors and manages each gateway's health and status, receives
          reports from the gateways, and provides data to the gateways to
          support operations.  The SCS also monitors and manages the health and
          status of its own subsystems.





                                     Page 5
<PAGE>   45
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

    2.2.4 SUBSCRIBER SEGMENT

          The Subscriber Segment consists of several types/configurations of
          subscriber equipment, any one of which, with proper registration and
          status, is all that is needed by an individual subscriber to utilize
          the communications service.  Each ISU controls unit operation,
          transmits/receives single channel subscriber-link data, converts the
          data to/from voice, receives subscriber-link signals from potential
          handoff antenna beam(s), chooses the best handoff options and
          determines its own location.


2.3 GLOSSARY OF TERMS

    AVAILABILITY   The percentage of time a customer has access to IRIDIUM
    communications services.

    ANALYSIS   Verification by technical or mathematical evaluation using
    mathematical representations (i.e., mathematical models, algorithms,
    equations), charts, graphs, circuit diagrams, and representative data or
    evaluation of previously qualified equipment as determined appropriate by
    Seller.

    ANTENNA BEAM PATTERN   An antenna beam cluster is defined as the pattern an
    individual antenna beam projects on the earth's surface.

    ANTENNA BEAM CLUSTER   An antenna beam cluster is defined as the number of
    antenna beams that can be created by a single SV antenna panel.

    AZIMUTH   Arc of the horizon around an axis on a line from the center of
    the earth through the observer, measured clockwise from 0 to 360 degrees
    with 0 degrees referenced to true north.

    BCF   Backup Control Facility.  See System Control Segment.

    BER  Bit Error Rate.  The fraction of a sequence of message bits that are in
    error.

    BLOCKING  The inability of the telecommunication system to establish a
    connection due to the unavailability of a traffic channel.

    CALL IMAGE  The information that the Servicing Space Vehicle provides to
    the Servicing Gateway that allows the Gateway to prepare a Call Detail
    Record.

    CALL SETUP   The time from the completion of subscriber dialing (following
    registration) to ringing of the distant party for ISU to ISU calls, or
    delivery of the ringing message to the PSTN for ISU to PSTN calls.

    CHANNEL    1) A unique combination of frequency, time and space in which a
    unique message may be transmitted.

    2) The propagating medium or electromagnetic path connecting the
    transmitter and receiver.

    CONSTELLATION   See ARTICLE 1, DEFINITIONS, of Contract terms and
    conditions.

    COVERAGE   The percentage of the earth's surface geometrically visible from
    the constellation as a function of time.  See paragraph 3.1.1 herein.

    CROSSLINK   A radio link between two space vehicles (intersatellite link).
    These links are in K-Band on the IRIDIUM System.

    CROSSPLANE   The crosslink between two co-rotating planes of space
    vehicles.

    DTOA   Differential Time of Arrival.





                                     Page 6
<PAGE>   46
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

    DEMONSTRATION    Verification as determined appropriate by Seller through
    operations, movement, and/or adjustment of the item to show its Go/No-Go
    functionality.  Compliance with qualitative standards for performance and
    functionality will be shown.

    EIRP   Effective Isotropic Radiated Power.  The product of the power
    supplied to the antenna and the antenna gain in a given direction relative
    to an isotropic antenna.  Also known as "absolute" or "true" antenna gain.

    EPHEMERIS   A set of numbers describing a satellite's orbit which permit
    the prediction of the position and velocity of the satellite at any point
    in time.

    ERLANG   The international dimensionless unit of traffic intensity.  One
    Erlang is the intensity in a traffic path continuously occupied, or in one
    or more paths carrying an aggregate traffic of 1 call-hour per hour, 1
    call-minute per minute, etc.

    EQUIVALENT VOICE CHANNEL   The channel capacity required to transport 2400
    bps vocoder data.

    FEEDER LINK   A K-Band radio link between an earth station (gateway or SCS)
    and a Space Vehicle, or between Space Vehicles, used to relay MD, MCD, SCD,
    and NOD.  Subscribers (Users) are not nodes of feeder links.

    FRAME   A protocol data unit to facilitate simple, reliable, and robust
    synchronization procedures for the transport of system data through
    communications channels.  Frames are delimited by placing sync markers
    between their boundaries.

    GATEWAY   See ARTICLE 1, DEFINITIONS, of Contract terms and conditions.

    GATEWAY INTERFACE SPECIFICATION   See ARTICLE 1, DEFINITIONS, of Contract
    terms and conditions.

    GATEWAY LINK   A radio (feeder) link between a Gateway Earth Terminal and a
    Space Vehicle.  These links are in K-Band on the IRIDIUM System.

    INPLANE   The crosslink between two adjacent co-planar space vehicles.

    INSPECTION   Verification by visual examination of the item, review of
    descriptive documentation, and comparison of the appropriate
    characteristics with a predetermined standard to determine conformance to
    requirements without the use of special laboratory equipment or procedures
    to the extent determined adequate by Seller.

    ISU    IRIDIUM Subscriber Unit.  A generic term referring to any subscriber
    unit configuration contained in the (IRIDIUM) Subscriber Segment.

    IRIDIUM COMMUNICATIONS SYSTEM   See ARTICLE 1, DEFINITIONS, of Contract
    terms and conditions.

    LINK   The propagating medium or electromagnetic path connecting the
    transmitter and receiver.

    LOS    Line of Sight.

    MCD   Mission Control Data.

    MCF   Master Control Facility.  See System Control Segment.

    MD     Mission Data.

    MISSION CONTROL DATA (MCD)   All data needed to establish and control
    IRIDIUM subscriber-links.  Examples of the types of data included in this
    category are the IRIDIUM pilot control signal that ISUs use to locate and
    synchronize with a servicing SV, ring-alerts to call-up ISUs, the data
    required for ISU validation and SV/ISU rf-power control information.

    MISSION DATA (MD)   All voice & message data transmitted and/or received by
    an IRIDIUM Subscriber Unit (ISU).





                                     Page 7
<PAGE>   47
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

    MISSION OPERATIONS   The operation of the IRIDIUM System to provide the
    IRIDIUM Communications Service.

    MISSION ORBIT   The orbit of each Space Vehicle from which it supports the
    provision of the IRIDIUM Communications Service.

    MOBILE EXCHANGE UNIT (MXU)   See ARTICLE 1, DEFINITIONS, of Contract terms
    and conditions.
    
    NADIR   The direction from a Space Vehicle to the earth on an imaginary
    line passing through the center of the earth (opposite of zenith).

    NETWORK   A complex of interconnections between at least two
    nodes/terminals.  The interconnections may be in any form which allows the
    transmission of information (wire, radio link, etc).

    NOD   Network Operations Data.  All data needed to manage and control the
    IRIDIUM Network.  Examples of the types of data included in this category
    are SV/GW rf-power control, SV/GW link assignments, cell-shutdown schedules
    and wild-card assignments.

    NODE   A terminal of any branch of a network, or a terminal common to two
    or more branches of a network.  In the IRIDIUM subscriber message network,
    the nodes are the Subscriber Unit, the Space Vehicle(s) and the Gateway(s).

    PACKET   A group of binary digits, including data and control elements,
    which is switched and transmitted as a composite whole.  The data, control
    elements and error control information are arranged in a specific format.

    PTT   Postal, Telegraph and Telephone (Authority).  The corporate or
    government entity which contracts with IRIDIUM for service.

    RA   Radio Astronomy.

    REGISTRATION   Registration involves the subscriber equipment identifying
    itself to the System and being validated by the System.

    RING-ALERT   The process of a SV interrogating an ISU to alert the
    subscriber via a ringer.

    SAFE MODE   The mode a Space Vehicle enters when either it determines that
    a prescribed set of conditions are met, e.g., it loses all of its
    crosslinks or has not had any communications from the SCS for a specified
    time period, or it is commanded to enter the mode.  When in the Safe Mode,
    the SV powers down all but essential equipment.  Typically, the SV will
    buffer specified telemetry data, provide a continuous low data rate
    telemetry transmission over the secondary link in the default key and check
    for commands addressed to it on its omni receiver and respond to those
    commands in a prescribed manner.

    SCC   SATCOM Control Center.  The deployment of the constellation will be
    under the control of Motorola's SATCOM Control Center.  The SCC will
    monitor, manage and control all elements of the Space System until the SCS
    is ready to assume control.

    SCD   System Control Data.  All data required to monitor and control the
    IRIDIUM Constellation and the Gateways.  This includes all TTAC data
    between the Space Vehicles and the SCS, and all statusing and commanding of
    the Gateways by the SCS.

    SCS   System Control Segment.

    SEGMENT   A conglomerate of subsystems which together performs a major
    function of the system.  The officially named Segments of the IRIDIUM
    System are Space, Gateway, Subscriber, and System Control.





                                     Page 8
<PAGE>   48
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

    SERVICE AREA   1) Area associated with a station for a given service and a
    specified frequency under specified technical conditions where radio
    communications may be established with existing or projected stations and
    within which the protection afforded by the frequency assignment or
    allotment plan or by any other agreement must be respected.  CCIR
    definition.

    SERVICE AREA   2) The area on the earth's surface defined by multiple pairs
    of latitude and longitude which, when encompassing an SV's nadir, define
    which servicing Gateway (GW) will perform the initial call setup tasks,
    that is to which GW the SV should route call setup requests.  Based on the
    results of geolocation of the ISU, the remainder of the call setup process
    responsibility may be transferred to another GW.  An initial assignment of
    service areas will be implemented by the SCS with consultation from Iridium
    LLC.  As new GWs are added to (or deleted from) the system, the service
    area assignments will be reviewed and adjusted as necessary and with
    consultation from Iridium LLC.  Service area assignments will be controlled
    by the SCS.  IRIDIUM definition.

    SERVICING GATEWAY   The Gateway which determines the initial routing of a
    call through the Network.  For ISU originated calls, the Servicing Gateway
    is the Gateway designated to perform the call setup function for the
    originating ISU's Servicing SV at the time the call is placed.  For PTT
    customer originated calls, the Servicing Gateway is the Gateway which
    interfaces with the originator's PTT.

    SERVICING SPACE VEHICLE   The Space Vehicle at a given point in time in
    whose cell a calling or called ISU is located.

    SIGNALING   Methods of formatting information and modulating a carrier for
    transmission/communication.

    SPACE SEGMENT   See ARTICLE 1, DEFINITIONS, of Contract terms and
    conditions.

    SPACE SYSTEM   See ARTICLE 1, DEFINITIONS, of Contract terms and
    conditions.
    
    SPACE SYSTEMS OPERATIONS PLAN   See ARTICLE 1, DEFINITIONS, of Contract
    terms and conditions.  

    STATE VECTOR   In general, a vector that describes the condition of a
    system.  For an IRIDIUM Space Vehicle, it is the position and velocity at a
    specified point in time, (x,y,z,xdot,ydot,zdot,t).  The position and
    velocity are specified in earth centered coordinates and time is given as
    the year, month, day, hour, minute and second.

    SUBSCRIBER LINK   A radio link between a Subscriber Unit (the User) and its
    servicing Space Vehicle (satellite).  These links are in L-Band on the
    IRIDIUM System.

    SATELLITE SUBSCRIBER UNIT INTERFACE SPECIFICATION   See ARTICLE 1,
    DEFINITIONS, of Contract terms and conditions.

    SUBSCRIBER UNIT SEGMENT   See ARTICLE 1, DEFINITIONS, of Contract terms and
    conditions.

    SV   Space Vehicle (or satellite)   See ARTICLE 1, DEFINITIONS, of Contract
    terms and conditions.  

    SYSTEM CONTROL SEGMENT   See ARTICLE 1, DEFINITIONS, of Contract terms and
    conditions.

    TTAC   Telemetry, Tracking, and Command Facility.  See System Control
    Segment.

    TEST   Verification through systematic exercising of the item with
    sufficient instrumentation to show operational performance to the extent
    determined appropriate by Seller.  Collection, analysis and evaluation of
    test data will show compliance with specified quantitative criteria.

    VOCODED VOICE   The digital data that is transmitted through the System and
    then reconstructed into a replica of the original speech.





                                     Page 9
<PAGE>   49
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

     VOICE CHANNEL    is defined as a single channelized or packetized
     communication resource that may be used to support transport of *
     milliseconds of 2400 Bit/Second of vocoded voice data, or the equivalent
     amount of signaling, bearer or network overhead traffic.  The terms Voice
     Channel, equivalent Voice Channel and Traffic Channel are used
     interchangeably."

     *Each facility consists of an Earth Terminal Controller (ETC) and up to    
     four Earth Terminals (ET's).

3.0  CONSTELLATION REQUIREMENTS

3.1. CONSTELLATION CONFIGURATION

     1.   PROVIDE CONTINUOUS COVERAGE   The Space System shall be designed to
          be capable of providing continuous coverage from any location on the
          surface of the earth or in the air within the simultaneous limits
          stipulated below:

     Max. Altitude for Subscriber Equipment:       *

     Min. Evaluation angle at Earth's surface:     * Degrees

     2.   ANTENNA BEAMS
          The Space System shall project antenna beams on the earth's surface
          in a  geometric pattern consistent with the coverage requirements
          herein.

     3.   NUMBER OF INDEPENDENT LINKS PER SV
          SV's shall be designed to have the capability of operating up to *
          *   independent SV GW/SCS feeder links per SV at maximum capacity.

     4.   CONSTELLATION-SCS MINIMUM ELEVATION ANGLES
          The minimum elevation angle (referenced to the horizon and measured
          from the SCS to the SV), for all SV-SCS communication links above
          which all requirements shall be satisfied,       *
          degrees.

     5.   SIMULTANEOUS OPERATION OF FEEDER LINKS
          The Constellation-GW/SCS feeder links shall be capable of operating
          simultaneously with the SV-SV crosslinks.

     6.   CROSSLINK COMMUNICATIONS
          Each SV shall be capable of simultaneous communications with SVs
          immediately ahead (fore) and behind (aft) in the same plane and with
          one SV in each adjacent co-rotating plane.

     7.   CROSSPLANE CROSSLINK OPERATIONAL LIMITATIONS
          Crossplane crosslinks between pairs of SVs shall be capable of
          operating when the nadir points of the SVs at each end of the link
          are   *   degrees latitude.

          The intention of this requirement is to specify when the crosslinks
          must operate and therefore that they need not operate at higher
          latitudes due to frame timing limitations.





- -----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 10
<PAGE>   50
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

3.2  COMMUNICATIONS REQUIREMENTS

     1.   CONSTELLATION-ISU RF LINK FOR MD AND MCD
          The Space System shall provide RF links between the Space Segment and
          the Subscriber Segment for the transmission of MD and MCD

     2.   CONSTELLATION SUBSCRIBER UPLINK FREQUENCY
          The subscriber to Constellation uplink shall have the capability to
          operate in the band from 1616.0 MHz to 1626.5 MHz.

     3.   CONSTELLATION SUBSCRIBER DOWNLINK FREQUENCY
          The Constellation to subscriber downlinks shall have the capability
          to operate in the band from 1616.0 MHz to 1626.5 MHz.

     4.   VOICE/DATA TRAFFIC CHANNEL BURST POWER FLUX DENSITY
          The minimum burst power flux density of a voice/data traffic channel
          that the full constellation shall be capable of producing at any
          point on the surface of the earth shall be
                                      *

          This requirement shall be satisfied at any location having a clear
          unobstructed view of the satellite.





                                      *




     4A.  DOWNLINK VOICE/DATA TRAFFIC CHANNEL MAXIMUM BER
          At a received signal level   *   lower than the maximum level
          specified in paragraph 4 above, an ISU designed to satisfy IRIDIUM
          specifications provided by contractor shall be capable of operating
          at a BER less than     *





- -----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 11
<PAGE>   51
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

     5.   VOICE/DATA/ACQUISITION CHANNEL UPLINK C/N(o)
          The receiver carrier-power-to-noise-spectral-density (C/N(o)) ratio
          at any satellite vehicle on any voice, data or acquisition subscriber
          channel under conditions defined below shall be greater than     *
          using a ground transmitter having a minimum EIRP of at least    *
          This requirement shall be met for more than  *  of the time averaged
          over 24 hours using the full satellite Constellation.  It shall apply
          only to transmissions from locations having an elevation angle
          greater than  *  degrees with a clear unobstructed view of the
          satellite and within an interference free channel.

     5A.  UPLINK VOICE/DATA TRAFFIC CHANNEL MAXIMUM BER
          With a test ISU designed to satisfy IRIDIUM specifications provided
          by Seller transmitting at a signal level  *  lower than that
          specified in paragraph 5 above, the BER measured at the output of any
          SV receiver shall be lower than   *

     6.   PAGING CHANNEL BURST POWER FLUX DENSITY
          The minimum burst power flux density of a paging channel shall be
          greater than  *  for more than  *  of the time and greater than    *
          for greater than    *   of the time.  This requirement shall be
          satisfied at any location having a clear unobstructed view of the
          satellite at any point on the surface of the earth.

     6A.  PAGING CHANNEL MAXIMUM BER
          At a received signal level    *    lower than the maximum level
          specified in paragraph 6 above, an ISU/pager designed to satisfy the
          IRIDIUM network paging specifications shall be capable of operating
          at a BER of less than

                                       *

     7.   RING ALERT CHANNEL BURST POWER FLUX DENSITY
          The minimum burst power flux density of a ring alert channel shall be
          greater than    *      for more than  *  of the time and greater than
            *  for greater than  *  of the time.  This requirement shall be
          satisfied at any location having a clear unobstructed view of the
          satellite at any point on the surface of the earth.

     7A.  RING ALERT CHANNEL MAXIMUM BER
          At a received signal level     *     lower than the maximum level
          specified in paragraph 7 above, an ISU designed to satisfy the
          IRIDIUM network specification shall be capable or operating at a BER
          of less than

                                       *





- -----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 12
<PAGE>   52
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

     8.   SUBSCRIBER LINK POWER CONTROL
          The Constellation-ISU subscriber traffic channel links (not including
          any channels reserved for acquisition or operating in an acquisition
          mode) shall be power controlled to enable the Space System to control
          link power over a nominal   *  range.

     9.   GEOLOCATION TIMELINESS/ACCURACY
          The Space System shall have the capability to support geolocation of
          stationary subscriber equipment within the following limits: 

          Location Error:                  * 
          Location Determination Time:     *
          Confidence:                      *

     10.  SV-SV Link Frequency
          The SV to SV links shall have the capability to operate in the band
          from 23,180 MHz to 23,380 MHz.

     11.  CONSTELLATION-GW RF LINK
          The Space System shall provide RF links between the Space Segment and
          the Gateway segment for the transmission of MD, MCD, SCD, and NOD.

     12.  CONSTELLATION-SCS RF LINKS
          The Space System shall provide both primary and secondary RF links
          between the Space Segment and the System Control Segment for the
          transmission of SCD and NOD.

     13.  PROVIDE SECONDARY COMM SYSTEM
          The SV secondary antenna shall be designed so that the SV, during any
          mission phase following deployment from the launch vehicle can
          receive signals from and send signals to the SCS.  This capability
          shall allow the SCS to command and monitor SVs that are operating
          with or without active altitude control, from any single or
          combination of overlapping TTAC or LEOP tracking facilities.  This
          capability shall provide opportunities for contacts with the SV of
          sufficient frequency and duration to permit the SCS to meet
          requirements to protect the health and safety of each SV and of the
          Constellation.

     14.  UPLINK FREQUENCY
          The Gateway to Constellation and SCS to Constellation uplinks shall
          have the capability  to operate in the band from 29,100 to 29,300
          MHz.

     15.  DOWNLINK FREQUENCY
          The Constellation to Gateway and Constellation to SCS downlinks shall
          have the capability to operate in the bank from 19,400 to 19,600 MHz.

     16.  FEEDER LINK POWER CONTROL
          The CONSTELLATION-SCS (primary communications link only) feeder link
          shall be power controlled to insure that the power available at the
          receiving location is   *   above the minimum necessary.





- -----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 13
<PAGE>   53
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

3.3      CAPACITY

         1.  PAGING CAPACITY
             Paging messages shall be packaged in Paging Message Frames, each
             of which shall be capable of containing  
                                       *
             where the frequency of such delivery does not exceed
                  *    in any one antenna beam pattern.

         2.  VOICE SUBSCRIBER CAPACITY PER BEAM PATTERN
             The Space System shall provide a maximum of   *   concurrent
             L-Band full duplex traffic channels in a single beam pattern.

         3.  PEAK CAPACITY PER ANTENNA BEAM CLUSTER
             Each Space Vehicle antenna beam cluster shall be capable of
             supporting up to

                                       *

         4.  PEAK SUBSCRIBER LINK CAPACITY PER SPACE VEHICLE
             Each Space Vehicle shall be capable of supporting up to     *
             full duplex traffic channels

                                       *

         5.  AVERAGE SUBSCRIBER LINK TRAFFIC LOAD PER SPACE VEHICLE PER ORBIT
             Each Space Vehicle shall be capable of supporting an average of
               *   full duplex traffic channels

                                       *

         6.  CONSTELLATION-GATEWAY CAPACITY
             Each Constellation-Gateway link shall be capable of supporting up
             to    *   full duplex traffic channels.

3.4      CONSTELLATION CONTROL

         1.  UNAUTHORIZED COMMAND ATTEMPTS
             The Space System shall have the capability to detect and report
             unauthorized attempts to command and control Space System assets,
             or to gain access to protect space system data.

         2.  MONITOR MISSION CRITICAL PARAMETERS
             Mission critical parameters shall be monitored.  Mission critical
             parameters are those to be defined by the seller as critical to
             network or Constellation operations.





- -----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 14
<PAGE>   54
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         3.  FAULT RESPONSES
             The Space System shall have the capability to respond to specific
             fault conditions with predetermined and/or SCS specified actions.
             Specific fault conditions are those to be defined by the seller.

         4.  RECONFIGURATION DUE TO NODE/LINK FAILURE
             The Space System shall provide the capability to reroute traffic
             through the space network within      *     upon detection of a
             single failure within the Constellation.

         5.  CONDUCT PM WITHOUT DEGRADING PERFORMANCE
             The Space System shall have the capability to perform preventive
             maintenance without degrading the quality of service.

             Preventive maintenance includes readiness checks which will run on
             system equipment, test equipment calibration, and periodic
             maintenance on ground-based equipment with moving parts (e.g.,
             line printers and disks).

         6.  PROCESS COMMANDS BY TYPE
             The Constellation shall have the capability to process:
             1)      Individual Real-Time Commands
             2)      Stacked Sequenced Commands
             3)      Commands for execution at a specified time.

         7.  SV COMMAND AUTHENTICATION
             Each SV shall have the capability to authenticate any command with
             the potential to damage the SV or disrupt Mission Operations prior
             to execution.

         8.  UPLINK AND LOAD SOFTWARE UPON COMMAND
             The Constellation shall provide the capability to accept commands
             from the SCS to uplink and load software modules into processors.

         9.  ROUTE TELEMETRY TO THE SCS
             Each SV shall be capable of routing telemetry to the SCS.

        10.  RESPOND TO SCS COMMANDS FOR SPECIFIC DATA
             Each SV shall respond to SCS commands for transmission of specific
             telemetry formats as defined by seller.

             This includes the capability to download memory and database
             information, and to verify the loading of uplinked software
             modules.  It also includes the transmission of low, normal and
             expanded data rate modes, and changes in the sampling rates and
             sampling points of telemetered information.

        11.  REPORT FAILED COMMAND ATTEMPTS TO SCS
             The Constellation shall have the capability to detect and report
             all failed authentication attempts, including the associated
             command field, to the SCS.





- -----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 15
<PAGE>   55
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

        12.  RECEIVE COMMANDS FROM SCS.  
             Each SV shall support reception of SCS commands, via the primary
             link, secondary link, and cross links.       
                   
        13.  MESSAGE ROUTING
             The Constellation shall support control and routing of MD, MCD,
             NOD, and SCD through the appropriate subscriber links and feeder
             links.
           
        14.  SV DE-BOOST
             Each SV shall have the capability of de-boosting to a perigee of
             less than * km at any time up to   *   years after orbit
             insertion with a probability of success of   *   percent.
           
        15.  SAFE MODE
             Each SV shall have the capability to enter a predetermined
             operating mode when the SV is unable to execute stored SCS
             commands.

3.5      CONSTELLATION OPERATIONS

         1.  GEOGRAPHIC BASED SERVICE RESTRICTIONS
             The Space System shall have the capability to selectively restrict
             service based on predetermined geographic parameters.

         2.  PROCESS CHANNEL REQUEST
             For each requested channel and        *             the Space
             System shall either assign a unique channel or send a "service not
             available" indication to the subscriber equipment.

             This time interval is measured for the time that the subscriber
             equipment initiates an acquisition sequence until the subscriber
             equipment receives the channel assignment or message including
             propagation times to and from the SV.

         3.  HANDOFF BETWEEN ANTENNA BEAMS
             The Space System shall have the capability to perform all
             handoffs, within an antenna beam pattern (frequency reuse pattern
             change), antenna beam pattern to antenna beam pattern within a SV,
             SV to SV, SV-GW and SV-SCS.

         4.  CONSTELLATION CONTRIBUTION TO REGISTRATION ACTIVITY
             The Constellation shall contribute no more than      *      to the
             subscriber registration activity.

         5.  CONSTELLATION DELAY FOR CALL SETUP
             The contribution of the Constellation to the Call Setup time
             between two subscriber units or between a subscriber unit and a
             PTT customer shall not exceed           *

         6.  TOTAL SV DELAY FOR VOICE COMMUNICATIONS
             The Constellation, excluding L-Band framing, shall contribute to
             no more than       *        one way delay to any voice
             communications link without failures           *





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 16
<PAGE>   56
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         7.  PROVIDE       *         LEVELS OF PRECEDENCE
             The Constellation shall provide the capability to support user
             acquisition on a priority basis with at least     *     levels
             of precedence.

         8.  CALL IMAGE DATA TO SCS
             Within a period of        *         after connection disconnect,
             the Constellation shall provide the SCS with the Connection image
             information it has gathered, and the Servicing Gateway with the
             Call Status Code.

3.6      ENVIRONMENTAL REQUIREMENTS

         1.  AVOID INTERFERENCE WITH OTHER SYSTEMS
             The Constellation shall have the capability to adjust transmitter
             power levels and channel frequency usage as directed by the SCS to
             avoid interference with other systems operating in the same
             spectrum.

         2.  ORBITAL DEBRIS
             The Space System shall have the capability to exercise all
             reasonable methods to minimize orbital debris.

3.7      COVERAGE REQUIREMENTS

         1.  EARLY CONSTELLATION COVERAGE
             The coverage of any subset of the fully populated Constellation
             shall be defined as including those areas on earth at which the
             elevation angle to any satellite within the Constellation is at
             least * degrees.  The Constellation shall provide limited
             coverage as it is being formed.  The coverage of the Constellation
             shall be dependent upon latitude.  The Constellation coverage
             schedule is reflected in the following table.  All coverage rates
             provided in the table are averaged over 5 day periods.

TABLE 3.7.1

CONSTELLATION EARTH COVERAGE STEPS

                                    STEPS

Latitude     I        II         III        IV         V         VI          VII



                                      *


The coverage percentages shown in the above table represent minimum coverage
requirements for the IRIDIUM constellation.  The percentages are based on the
surface area of a constant radius sphere.

                                      *





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 17
<PAGE>   57
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

4.0      SYSTEM CONTROL SEGMENT REQUIREMENTS

4.1      MONITOR AND CONTROL REQUIREMENTS

         1.  MAINTAIN CONSTELLATION FAULT RESPONSE CRITERIA
             The SCS shall have the capability to establish and maintain fault
             condition criteria and associated command responses for the
             Constellation.

         2.  REQUEST DIAGNOSTICS
             The SCS shall have the capability to request the Constellation to
             execute diagnostic procedures for fault detection and isolation.

         3.  PROCESS TELEMETRY
             The SCS shall have the capability to receive and process
             Constellation telemetry.

         4.  GENERATE CONSTELLATION COMMANDS
             The SCS shall have the capability to format and transmit commands
             to the Constellation.

         5.  AUTHENTICATION COMMAND COUNT
             The SCS shall have the capability to maintain a count of each
             successful authentication of a critical command for each SV.

         6.  GENERATE SINGLE OR STACKED COMMANDS
             The SCS shall have the capability to generate a set of one or more
             commands to be executed either upon receipt or at a designated
             time not already assigned to another command.

         7.  COMMAND DESIGNATION
             The SCS shall be capable of redesignating commands as critical or
             non-critical.

         8.  GENERATE EPHEMERIS FOR SYSTEM OPS
             Using an SCS-produced full state vector or element set, the SCS
             shall be capable of generating the ephemeris of any SV.

         9.  ORBIT DETERMINATION
             The SCS shall be capable of estimating orbital parameters on the
             basis of time tagged azimuth, elevation measurements, and DTOAs.

        10.  KNOWLEDGE BOX
             The SCS shall have the capability to maintain knowledge of the
             Constellation ephemeris.

        11.  PLAN MANEUVERS AND GENERATE COMMANDS
             The SCS shall have the capability to plan the station keeping
             maneuvers and generate commands for each Space Vehicle as required
             to maintain its mission orbit.





                                    Page 18
<PAGE>   58
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

       12.   CONTROL BOX
             The SCS shall have the capability to maintain the Constellation
             positions to within:


                          Crosstrack:         *
                          Intrack:            *
                          Radially:           *


                                      *


       13.   SPARED SV CLOCK ACCURACY
             The SCS shall have the capability to maintain the clock of each SV
             in sparing orbit to within       *
            
       14.   GENERATE DTOA VALUES
             The SCS shall be capable of generating differential
             time-of-arrival (DTOA) values.
            
             *
            
            
       15.   COMMANDS TO MAINTAIN SPARING ORBIT
             The SCS shall have the capability to plan the station keeping
             maneuvers and generate commands for each SV as required to
             maintain its sparing orbit.
            
       16.   MANAGE CONSTELLATION POWER
             The SCS shall have the capability to manage the power of the
             Constellation, both individually and collectively.
            
       17.   PREDICT CONSTELLATION THERMAL CONDITIONS
             The SCS shall have the capability to manage the thermal conditions
             of the Constellation based on expected illumination
             geometry/history and equipment status/utilization.
            
       18.   COMMAND SV TO ORBIT
             The SCS shall have the capability to plan and command the orbit
             maneuvers required for each Space Vehicle to establish its orbit.
            
       19.   PERFORM ON ORBIT TESTING
             The SCS shall have the capability to perform on-orbit testing of
             each Space Vehicle as required to verify that the Space Vehicle is
             ready to commence Mission Operations.
            
       20.   LOCATE SV IN ANOMALOUS OR UNKNOWN ORBITS
             The SCS shall have the capability to search for and locate any SV
             within          *
            
       21.   MANAGE LAUNCH PLANS & SCHEDULES
             The SCS shall have the capability to manage launch plans and
             schedules.
 




- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 19
<PAGE>   59
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


         22. DETECT NODE/LINK FAILURES
             The SCS shall have the capability to detect node and link failures
             in the Space System within            *         of their
             occurrence.

         23. ESTABLISH ALT ROUTES
             The SCS shall have the capability to establish network routing
             instructions based on the health and status of the Constellation,
             GWs, and SCS.

         24. SET MAX NUMBER OF CROSSLINKS TRAVERSED
             The SCS shall have the capability to specify to the Constellation
             in the Network the maximum number of crosslinks a packet may
             traverse before the packet is discarded, up to a maximum of
                       *

         25. CONTROL ANTENNA BEAM ACTIVATION
             The SCS shall have the capability to determine, plan, and
             distribute antenna beam activation and deactivation instructions.

         26. CONTROL OF OPERATIONAL ELEMENTS
             The SCS shall have the capability to remove from service or
             restore to service any operational network node (Constellation or
             Gateway), or any operational network communications link.

         27. RECONFIGURATION DUE TO MULTIPLE FAILURES
             The SCS shall have the capability to reconfigure the network
             within    *   upon detection of MULTIPLE node or
             link failure.

         28. MANAGE PSTN PHONE NUMBER TO GW MAP
             The SCS shall have the capability to manage the Gateway-to-PSTN
             phone number mappings.

         29. MANAGE PHONE NUMBER TO GW MAP
             The SCS shall have the capability to manage subscriber equipment
             phone number-to-Gateway mappings.

         30. ASSIGN CALL SETUP RESPONSIBILITIES
             The SCS shall have the capability to assign GW call setup service
             areas.

         31. REASSIGN CALL SETUP SERVICE AREAS
             The SCS shall have the capability to reassign GW call setup
             service areas within       *      of detection for single gateway
             failures.

         32. MULTIPLE GW FAILURES
             The SCS shall have the capability to reassign GW call setup
             service areas within          *     of detection for multiple
             gateway failures.

         33. UPDATE PHONE NUMBER MAP
             The SCS shall have the capability to update phone number-to-PSTN
             mapping within     *     of detection for single gateway failures.





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 20
<PAGE>   60
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


         34. MAP UPDATE FOR MULTIPLE FAILURES
             The SCS shall have the capability to update phone number-to-PSTN
             mapping within        *           of detection for multiple
             gateway failures.

         35. SCHEDULE FEEDER LINKS
             The SCS shall have the capability to schedule and allocate SCS/GW
             feeder links and disseminate the schedule to affected nodes.

         36. MANAGE SV DATA
             As a minimum, the SCS shall have the capacity and capability to
             manage telemetry, command, and both current and historical
             configuration data for the Constellation of space vehicles which
             are performing network functions, as well as  *  SVs which are
             on-orbit spares,  *  SVs in parking orbit or in transition to
             either operational or storage orbits and  *  SVs which have been
             decommissioned but have yet to re-enter the atmosphere.

         37. PROVIDE CAPABILITY TO TEST ALL LINKS
             The SCS shall have the capability to test all links.

         38. MASTER SERVICE DENIAL LIST
             The SCS shall have the capability to manage the Master Subscriber
             Equipment Service Denial List.

         39. MANAGE SERVICE RESTRICTIONS
             The SCS shall have the capability to selectively restrict service
             based on geographic parameters.

         40. MAINTAIN GW FAULT RESPONSE CRITERIA
             The SCS shall have the capability to establish and maintain for
             each Gateway, fault condition criteria and associated command
             responses.

         41. REQUEST GW DIAGNOSTICS
             The SCS shall have the capability to direct/request each Gateway
             to execute diagnostic procedures for fault detection and
             isolation.

         42. MONITOR SCS CRITICAL PARAMETERS
             The SCS shall have the capability to monitor SCS mission critical
             parameters.

         43. EXECUTE FAULT RESPONSES
             The SCS shall have the capability to respond to specific fault
             conditions with predetermined actions.

         44. AVOID INTERFERENCE WITH OTHER SYSTEMS
             The SCS shall have the capability to direct the GWs, SVs and SCS
             transmitter equipment to adjust transmitter powers and use
             frequencies which will avoid interference with other systems as
             required to conform to all applicable operating licenses.





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 21
<PAGE>   61
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


         45. GRACEFUL DEGRADATION
             The SCS shall be capable of planning for and providing sufficient
             SCD and NOD to each node in the Network to allow the Network to
             continue to function for up to            *
             without further SCD and NOD inputs from the SCS.

         46. MANAGE SOFTWARE/HARDWARE CONFIGURATION
             The SCS shall have the capability to manage the configuration of
             SV, SCS, and GW software and hardware.

         47. SV-SCS CHANNEL CAPACITY
             The SCS shall be capable of supporting up to        *     (routine
             and memory dump SCD/NOD) on each SV-SCS primary link.

                                      *

         48. MONITOR RECEIVED DATA AND GENERATE ALARMS
             The SCS shall have the capability to monitor SCS-received data and
             generate alarms when out-of-tolerance (OOT) conditions or fault
             messages are detected.

         49. SYSTEM MASTER CLOCK
             The SCS shall have the capability to maintain the System Master
             Clock.

         50. MISSION CONSTELLATION CLOCK ACCURACY
             The SCS shall have the capability to maintain Constellation clocks
             to within       *

         51. SV-SCS PRIMARY DOWNLINK SCD BER
             The SCS shall be designed to operate with the SV such that the
             primary downlink feeder link end-to-end bit error rate (BER) will
             be no greater than       *

         52. SV-SCS SECONDARY DOWNLINK SCD BER
             The SCS shall be designed to operate with the SV such that the
             secondary downlink feeder link end-to-end bit error rate (BER)
             will be no greater than       *

         53. UNAUTHORIZED COMMAND ATTEMPTS
             The SCS shall have the capability to detect and report attempts to
             command and control, or gain access to protected system data.

         54. MINIMIZE ORBITAL DEBRIS
             The SCS shall have the capability to exercise all reasonable
             methods to minimize orbital debris.

         55. PHYSICAL AND COMPUTER SECURITY
             The SCS shall have the capability to implement physical and
             computer security procedures to ensure the security of Space
             System resources.





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 22
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

4.2      INTERFACES

         1.  PROVIDE SV KNOWLEDGE BOX UPDATES
             The SCS shall be capable of providing all pertinent orbit updates,
             to each SV and each GW, at least as often as every   *

         2.  GW-SCS CALL DETAIL RECORD TRANSMISSION FREQUENCY
             The SCS shall be capable of receiving abbreviated call detail
             records from each GW at least    *

         3.  EXCHANGE SCD WITH GATEWAYS
             The SCS shall have the capability to plan, format and transmit
             system control data to Gateways and receive system control data
             from Gateways.

         4.  EXCHANGE NOD WITH GATEWAYS
             The SCS shall have the capability to plan, format, and transmit
             network operations data to Gateways and receive network operations
             data from Gateways.

         5.  SATELLITE EPHEMERIS DATA FOR RADIO ASTRONOMY
             The SCS shall be capable of supplying satellite ephemeris data for
             all IRIDIUM satellites to registered Radio Astronomy
             organizations.

         6.  RADIO ASTRONOMY SCHEDULING INTERFACE
             The SCS shall be capable of receiving, recording, and
             acknowledging the schedules for Radio Astronomy (RA) observations
             in the 1610.6 to 1613.8 MHz RA band of registered RA organizations
             for registered RA sites.

         7.  SV-SCS LINK CAPACITY
             The SCS shall be capable of communicating with any SV using a
             single SV-SCS link.

         8.  TRANSPARENCY OF HANDOFFS
             SV-SCS feeder link handoff shall be accomplished without
             interruption of monitor and control operations.

         9.  SV-SCS PRIMARY RF LINK
             The SCS shall provide a primary RF link for line-of-sight
             communications with a Space Vehicle's primary communications link
             for the transmission of SCD and NOD.

         10. SV-SCS SECONDARY RF LINK
             The SCS shall provide a secondary RF link for line-of-sight
             communications with a Space Vehicle's secondary communications
             link for the transmission of SCD.

         11. ADJUST EIRP
             The SCS shall have the capability to adjust the EIRP on each
             SCS-SV uplink.

         12. MEASURE/REPORT RECEIVED POWER
             The SCS shall be capable of measuring and reporting the received
             power on each SV-SCS downlink.





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 23
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         13. SCS-GW FEEDER LINK
             The SCS shall be capable of communications with each Gateway via
             the feeder link network.

         14. SCS-GW SECURE COMMERCIAL COMM LINK
             The SCS shall be capable of secure communications with each
             Gateway via commercial communication links.

         15. SCS-SPACE LAUNCH OPERATIONS INTERFACE
             The SCS shall have the capability to support a communications
             interface between the SCS and the Space Segment launch activity.

         16. SCS UPLINK FREQUENCY
             The SCS shall have the capability to operate SCS-SV uplinks in the
             band form 29,100 to 29,300 MHz.

         17. SCS DOWNLINK FREQUENCY
             The SCS shall have the capability to operate SV-SCS downlinks in
             the band from 19,400 to 19,600 MHz.

         18. PROVIDE TIME OFFSETS
             The SCS shall be capable of providing IRIDIUM System Time offsets
             from other time standards to the Gateways.

4.3      MAINTAINABILITY REQUIREMENTS

         1.  CONDUCT PM WITHOUT DEGRADING PERFORMANCE
             The SCS shall have the capability to perform preventative
             maintenance without degrading operational capability.

             The SCS shall have the capability of performing preventive
             maintenance without degrading the quality of service.

         2.  DIAGNOSTICS WITHOUT SERVICE DEGRADATION
             The SCS shall have the capability of performing diagnostic
             procedures without degrading the quality of service.





                                    Page 24
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

5.0      MILESTONES

         5.0.1   Buyer shall have the right to challenge the assertion of
         Seller that any milestone has been completed in accordance with the
         Milestone Acceptance Criteria pursuant to Paragraph E, Article 5,
         PAYMENT.

5.1      MILESTONE 1     MAIN MISSION ANTENNA (MMA) PRELIMINARY DESIGN REVIEW
         (PDR)

         5.1.1   MILESTONE DESCRIPTION
         An approximately two day long MMA PDR shall be conducted by the MMA
         seller at the seller's facilities to review the development of the
         MMA.  Design and construction plans shall be available for review.
         MMA requirement compliance shall be presented.  Design development
         data shall be provided to verify critical design decisions.

         5.1.2   MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.

5.2      MILESTONE 2    COMMUNICATIONS MODULE (CM) PRELIMINARY DESIGN REVIEW
         (PDR)

         5.2.1   MILESTONE DESCRIPTION
         An approximately two day long CM PDR shall be conducted by the CM
         seller at the seller's facilities to review the development of the CM.
         Design and construction plans shall be available for review.  CM
         requirement compliance shall be presented.  Design development data
         shall be provided to verify critical design decisions.

         5.2.2   MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.

5.3      MILESTONE 3   SPACE VEHICLE MANUFACTURING PLAN

         5.3.1   MILESTONE DESCRIPTION
         This milestone encompasses the initial release of the manufacturing
         plan which is a top level document defining the Space Vehicle final
         assembly processes and facilities; and labor, equipment and schedule
         requirements associated with those processes.  The assembly activities
         will begin with a fully assembled and tested Communication Module (CM)
         Main Mission Antenna, bus assembly and solar arrays.  Conclusion of
         these assembly and test activities will result in a complete Space
         Vehicle ready for shipment and launch.  Being an "Initial Release",
         however,  it may have many provisions which will not be completed,
         but, that will be completed no later than the completion of the entire
         Space System.

         5.3.2   MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed completed when Motorola internally
         issues the initial release of the Space Vehicle Manufacturing Plan.

5.4      MILESTONE 4   SCS EARTH TERMINAL PRELIMINARY DESIGN REVIEW (PDR)

         5.4.1   MILESTONE DESCRIPTION
         The Seller shall conduct a Preliminary Design Review at the Seller's
         facility.  It shall be used to determine that: "hardware, software,
         functional, performance, interface and design requirements are
         complete and consistent with the Earth Terminal section of the IRIDIUM
         System Control Segment Specification and applicable documents and that
         there is an achievable plan to design, produce and test the Earth
         Terminal, including all lower level assemblies and interfaces.





                                    Page 25
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         5.4.2    MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and establishment by Seller of
         specific action items resulting from the review this milestone shall
         be deemed completed.

5.5      MILESTONE 5      SCS EARTH TERMINAL CONTROLLER PRELIMINARY DESIGN
         REVIEW (PDR)

         5.5.1   MILESTONE DESCRIPTION
         The Seller shall conduct a Preliminary Design Review at the Seller's
         facility.  It shall be used to determine that: hardware, software,
         functional, performance, interface and design requirements are
         complete and consistent with the Earth Terminal Controller section of
         the IRIDIUM System Control Segment Specification and applicable
         documents and that there is an achievable plan to design, produce and
         test the Earth Terminal Controller, including all lower level
         assemblies and interfaces.

         5.5.2   MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and establishment by Seller of
         specific action items resulting from the review this milestone shall
         be deemed completed.

5.6      MILESTONE 6       SYSTEM CONTROL SEGMENT PRELIMINARY DESIGN REVIEW
         (PDR)

         5.6.1   MILESTONE DESCRIPTION
         The Seller shall conduct a Preliminary Design Review at the Seller's
         facility.  It shall be used to determine that: hardware, software,
         functional, performance, interface and design requirements are
         complete and consistent with the IRIDIUM System Control Segment
         Specification and applicable documents and that there is an achievable
         plan to design, produce and test the System Control Segment, including
         all lower level assemblies and interfaces.

         5.6.2    MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and establishment by Seller of
         specific action items resulting from the review the milestone shall be
         deemed completed.

5.7      MILESTONE 7      SCS EARTH TERMINAL CRITICAL DESIGN REVIEW (CDR)

         5.7.1   MILESTONE DESCRIPTION
         An approximately two day long Critical Design Review (CDR) shall be
         conducted at the Seller's facilities to review the development of the
         SCS Earth Terminal design.  Relevant design and construction plans
         shall be presented.  Segment requirement compliance shall be
         presented.  Design development data to verify critical design
         decisions shall be presented.

         5.7.2    MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and establishment by Seller of
         specific action items resulting from the review this milestone shall
         be deemed completed.

5.8      MILESTONE 8      SCS EARTH TERMINAL CONTROLLER CRITICAL DESIGN REVIEW
         (CDR)
       
         5.8.1    MILESTONE DESCRIPTION
         An approximately two day long Critical Design Review (CDR) shall be
         conducted at the Seller's facilities to review the development of the
         SCS Earth Terminal Controller design.  Relevant design and
         construction plans shall be presented.  Segment requirement compliance
         shall be presented.  Design development data to verify critical design
         decisions shall be presented.

         5.8.2    MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and establishment by Seller of
         specific action items resulting from the review, the milestone shall
         be deemed completed.





                                    Page 26
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

5.9      MILESTONE 9     COMMUNICATIONS MODULE (CM) CRITICAL DESIGN REVIEW
         (CDR)

         5.9.1    MILESTONE DESCRIPTION
         An approximately two day long CM CDR shall be conducted by the CM
         seller at the seller's facilities to review the development of the CM.
         Design and construction details shall be available for review.  CM
         requirement compliance shall be presented.  Design test data shall be
         provided to verify critical design decisions.

         5.9.2    MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting form the review this milestone
         shall be deemed completed.

5.10     MILESTONE 10    SYSTEM CONTROL SEGMENT CRITICAL DESIGN REVIEW (CDR)

         5.10.1    MILESTONE DESCRIPTION
         An approximately two day long Critical Design Review (CDR) shall be
         conducted at the Seller's facilities to review the development of the
         System Control Segment design.  Relevant design and construction plans
         shall be presented.  System requirement compliance shall be presented.
         Design development data to verify critical design decisions shall be
         presented.

         5.10.2    MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and establishment by Seller of
         specific action items resulting from the review this milestone shall
         be deemed completed.

5.11     MILESTONE 11   MAIN MISSION ANTENNA (MMA) CRITICAL DESIGN REVIEW (CDR)

         5.11.1    MILESTONE DESCRIPTION
         An approximately two day long MMA CDR shall be conducted by the MMA
         seller at the seller's facilities to review the development of the
         MMA.  Design and construction Details shall be available for review.
         MMA requirement compliance shall be presented.  Design test data shall
         be provided to verify critical design parameters.

         5.11.2     MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting form the review this milestone
         shall be deemed completed.

5.12     MILESTONE 12    SPACE SYSTEM CRITICAL DESIGN REVIEW (CDR)

         5.12.1    MILESTONE DESCRIPTION
         An approximately two day long Space System Critical Design Review
         (CDR) shall be conducted by the seller at the seller's facilities to
         review the development of the Space System design.  Relevant design
         and construction plans shall be presented.  Space System requirement
         compliance shall be presented.  Design development data to verify
         critical design decisions shall be presented.

         5.12.2    MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting form the review this milestone
         shall be deemed completed.

5.13     MILESTONE 13     SATCOM CONTROL CENTER (SCC) CONSTRUCTION COMPLETE.

         5.13.1    MILESTONE DESCRIPTION
         When all the necessary building facilities and subsystems (heating,
         ventilation, air conditioning, power and security) are operating such
         that the SATCOM Control Center is ready to support the integration and
         test of control and communications equipment as required to operate
         the Space System, a formal review with the Buyer shall be held
         on-site.





                                    Page 27
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         5.13.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.

5.14     MILESTONE 14     SPACE VEHICLE TEST PLAN

         5.14.1     MILESTONE DESCRIPTION
         This milestone encompasses the initial release of the Space Vehicle
         Test Plan.  Being an initial release, however, it may have many
         provisions which are not yet then completed (i.e. TBD), but, will
         ultimately be completed no later than completion of the entire Space
         System.  The primary objective of this plan is to define the test
         program to be implemented by Motorola's Assembly, Integration and Test
         (AIT) organizations.  The AIT program will consist of three distinct
         phases:
             a.      Qualification Vehicle program
             b.      Initial Production program
             c.      Production program

         This test plan provides the top level document from which the test
         processes will be implemented.  It includes the test program from the
         beginning of the test program (i.e., Qualification Test Vehicle (QTV)
         test program) through the test program for the production space
         vehicles that make up the IRIDIUM constellation.  Organizational
         responsibilities, documentation requirements, as well as the general
         support equipment and facilities used are identified by this test
         plan.  Additional testing of breadboards, engineering models,
         structural test vehicles, etc. are not included as a part of this
         plan.

         5.14.2     MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed completed when Motorola internally
         issues the initial release of the Space Vehicle Test Plan.

5.15     MILESTONE 15    SPACE SYSTEM OPERATIONS PLAN

         5.15.1    MILESTONE DESCRIPTION
         The primary objective of this plan is to describe the intended
         operations of the constellation within the IRIDIUM Communications
         System as reflected in the System Operations Concept, the System
         Specification, and the segment Specifications.  Details on staffing
         and processes shall be included in the document.  The document shall
         detail the Network and Constellation Operations.

         5.15.2     MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed completed when Motorola internally
         releases the Network Operations Plan.

5.16     MILESTONE 16     MAIN MISSION ANTENNA QUALIFICATION MODEL TEST

         5.16.1     MILESTONE DESCRIPTION
         The MMA Qualification Model is a prototype of the MMA built to
         production oriented requirements and processes.  The MMA Qualification
         Model shall be tested to qualify the MMA design and production
         processes for space use.

         5.16.2     MILESTONE ACCEPTANCE CRITERIA
         This milestone is complete when the testing required by the MMA
         integrated test plan has been performed and any specific action items
         established.





                                    Page 28
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

5.17     MILESTONE 17   SPACE VEHICLE BUS QUALIFICATION TEST COMPLETE

         5.17.1     MILESTONE DESCRIPTION
         The BM shall be tested to qualify the Bus Module Design and production
         processes for space use.

         5.17.2     MILESTONE ACCEPTANCE CRITERIA
         This milestone is complete when the test sequence required by the
         suppliers integrated test plan has been performed, and any specific
         action items established.

5.18     MILESTONE 18     SPACE VEHICLE QUALIFICATION MODEL ASSEMBLY COMPLETE

         5.18.1     MILESTONE DESCRIPTION
         After completion of the subsystem qualifications, the Bus
         Qualification, CM, and MMA Models shall be assembled for testing as an
         integrated SV.

         5.18.2     MILESTONE ACCEPTANCE CRITERIA
         This milestone is complete when the SV Qualification Model is ready
         for start of testing in accordance with the Space Vehicle Test Plan.

5.19     MILESTONE 19    SPACE SYSTEM DT&E TEST READINESS REVIEW

         5.19.1     MILESTONE DESCRIPTION
         An approximately one day long System DT&E Test Readiness Review will
         be conducted by SATCOM System Engineering at the Seller's facilities.
         This review is held to demonstrate that the documentation, test
         equipment and personnel are currently on hand so that formal DT&E can
         commence in accordance the System DT&E Test Plan.

         5.19.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.

5.20     MILESTONE 20    SPACE VEHICLE SUPPLIER PRODUCTION READINESS REVIEWS
         (PRR'S)

         5.20.1     MILESTONE DESCRIPTION
         An approximately two day long PRR shall be conducted at Motorola or
         its Supplier's  Facilities to review the qualification data and design
         details of the manufacturing process of the Bus Module, Communications
         Module, and Main Mission Antenna.  The reviews shall establish the
         extent to which Motorola and its suppliers are ready for full scale
         production of these modules.

         5.20.2     MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review the milestone shall
         be deemed completed.

5.21     MILESTONE 21   SATCOM CONTROL CENTER (SCC) READY FOR OT&E TEST

         5.21.1     MILESTONE DESCRIPTION
         Upon the completion of the integration of all the hardware and
         software necessary for operations by the SATCOM Control Center as part
         of the SCC OT&E testing, a one day readiness review will be conducted.
         Seller shall present the results of the review to the Buyer.

         5.21.2     MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.





                                    Page 29
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

5.22     MILESTONE 22   SPACE VEHICLE QUALIFICATION TEST/SPACE SYSTEM
         COMPLIANCE MATRIX UPDATE

         5.22.1      MILESTONE DESCRIPTION
         The SV Qualification model shall be tested as required in the SV Test
         Plan developed by Seller to demonstrate integrated compatibility of
         the Bus Module, Communications Module and MMA and SV integration
         processes.

         The Space System compliance matrix presented at the Space System
         Critical Design Review (Milestone 12) shall be updated based on lower
         level test data available since Milestone 12.
 .
         5.22.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed complete when Seller: (1) completes the
         Space Vehicle Qualification Testing, and establishes specific action
         items; and (2) provides to the Buyer the results of the Seller's Space
         System compliance review update showing Seller's determination of the
         current status of compliance of the Space System with the key system
         parameters of the Statement of Work as specified in Table 5.1 of this
         exhibit.  Compliance conclusions shall be based on a combination of
         demonstration, testing, or analyses as determined appropriate in
         Seller's sole discretion.

5.23     MILESTONE 23     TTAC WEST CONSTRUCTION COMPLETE

         5.23.1      MILESTONE DESCRIPTION
         When all the necessary building facilities subsystems (heating,
         ventilation, air conditioning, power and security) are operating such
         that the TTAC West facility is ready to support the integration and
         test of control and communications equipment as required to operate
         the IRIDIUM Communications System, a formal review with the general
         contractor shall be held on-site.

         5.23.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.

5.24     MILESTONE 24    SPACE SYSTEM MULTIPLE SV DT&E TEST REPORT

         5.24.1      MILESTONE DESCRIPTION
         The objective of this milestone is to provide the test report on the
         Space System DT&E testing conducted in accordance with the DT&E Test
         Plan.  This report shall contain collected and summarized data and all
         conclusions resulting from the various test configurations as
         identified in the DT&E Test Plan.  Each test will be clearly
         identified with supporting test procedures, identified test equipment,
         appropriate drawings, and results attained.

         5.24.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be considered complete when the Seller internally
         releases the test report.

5.25     MILESTONE 25   SCC AND TTAC INTEGRATION & TEST (OT&E) COMPLETE

         5.25.1      MILESTONE DESCRIPTION
         Upon the completion of the integration and testing of all the hardware
         and software of the SCC required to support the very first launch, an
         approximately one day long Pre-Operations Readiness Review shall be
         conducted at the Seller's facilities to review the ability of the
         SATCOM Control Center and at least one of the TTAC's to support manned
         operations.

         5.25.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's the completion of the review and the establishment by
         Seller of specific action items resulting from the review, the
         milestone shall be deemed completed.





                                    Page 30
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

5.26     MILESTONE 26      SCC AND TTAC READY TO SUPPORT FIRST LAUNCH

         5.26.1      MILESTONE DESCRIPTION
         Upon the completion of the SCC operator Launch Readiness Training, an
         approximately one day long Launch Readiness Review shall be conducted
         at the Seller's facilities to review the operational status of the
         available TTAC's and the SCC.  Compliance with Motorola's internal
         performance-related specification to support the very first launch
         shall be presented.  Operator certification compliance shall also be
         presented.

         5.26.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and establishment by Seller of
         specific action items resulting from the review, this milestone shall
         be deemed completed.

5.27     MILESTONE 27      PRELIMINARY SATELLITE SUBSCRIBER UNIT INTERFACE
         SPECIFICATION

         5.27.1      MILESTONE DESCRIPTION
         This milestone encompasses the initial issuance of the preliminary
         satellite subscriber unit <voice> interface specification.

         Note:  This specification will not have been validated by Seller, and
         therefore, may be used for planning purposes only.  Seller makes no
         promises or guarantees either expressed or implied as to the accuracy
         of the information included therein.

         5.27.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed complete when Seller internally issues
         the initial release of the satellite subscriber unit [voice] interface
         specification and delivers it to Buyer.

5.28     MILESTONE 28      SPACE SYSTEM OPERATIONAL TESTING AND EVALUATION
         (OT&E) TEST READINESS REVIEW

         5.28.1      MILESTONE DESCRIPTION
         An approximately one day long Space System OT&E Test Readiness Review
         will be conducted at the Seller's facilities.  This review is held to
         demonstrate that planning, documentation, test equipment and personnel
         are currently on hand so on-orbit Space System testing can commence at
         the conclusion of initial launch.  OT&E will include on-orbit test and
         evaluations conducted at the inter-segment level using network
         software/protocol, documentation, and personnel.

         5.28.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.

5.29     MILESTONE 29   ATP PROCEDURES

         5.29.1      MILESTONE DESCRIPTION
         The Space System Acceptance Test Plan (ATP) procedures describe the
         tests, test methods and test limits in accordance with the Acceptance
         Plan (Exhibit C).

         5.29.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when the ATP procedures are internally
         issued by Seller.

5.30     MILESTONE 30   INITIAL LAUNCH

         5.30.1      MILESTONE DESCRIPTION
         The launch of the first Space Vehicle(s)





                                    Page 31
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IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         5.30.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed upon intentional ignition of the Launch
         Vehicle carrying the first Space Vehicle(s) intended for deployment as
         part of the constellation.

5.31     MILESTONE 31   INITIAL LAUNCH TEST DATA REPORT

         5.31.1      MILESTONE DESCRIPTION
         The objective of this milestone is to provide an initial assessment of
         the health and status of each of the first space vehicle(s) arriving
         at a parking orbit following launch.  This report will contain data
         such as; SV telemetry runs, SV BIT data, and BER test data on the
         primary and secondary SV-SCS links.

         5.31.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed complete when the test report is
         internally issued within Motorola.

5.32     MILESTONE 32   STEP I OF TABLE 3.7.1

         5.32.1      MILESTONE DESCRIPTION
         This milestone represents the coverage provided by six satellites
         arranged in a cluster across three planes (two satellites per plane).

         5.32.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when Seller achieves the Space System
         coverage levels for this milestone as referred to in Step I of Table
         3.7.1.

5.33     MILESTONE 33   FINAL TEST REPORT (INITIAL LAUNCH)

         5.33.1      MILESTONE DESCRIPTION
         The objective of this milestone is to provide the final test report on
         the first Space Vehicle(s) arriving at a parking orbit following
         launch.  This report shall contain collected and summarized data and
         all conclusions resulting from System level tests for the various test
         configurations as identified in the OT&E Test Plan.  Each test will be
         clearly identified with supporting test procedures, identified test
         equipment, appropriate drawings, and results attained.

         5.33.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed complete when the test report is
         internally issued within Motorola.

5.34     MILESTONE 34   STEP II OF TABLE 3.7.1

         5.34.1      MILESTONE DESCRIPTION
         This milestone represents the coverage provided by one plane of
         satellites with no credit for the cluster satellites in plane two and
         plane three.

         5.34.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when Seller achieves the Space System
         coverage levels for this milestone as referred to in Step II of Table
         3.7.1.

5.35     MILESTONE 35   STEP III OF TABLE 3.7.1

         5.35.1      MILESTONE DESCRIPTION
         This milestone represents the coverage provided by two planes of
         satellites with no credit for the cluster satellites in the third
         plane.

         5.35.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when Seller achieves the Space System
         coverage levels for this milestone as referred to in Step III of Table
         3.7.1.





                                    Page 32
<PAGE>   72
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

5.36     MILESTONE 36   MCF CONSTRUCTION COMPLETE

         5.36.1      MILESTONE DESCRIPTION
         When all the necessary building facilities subsystems (heating,
         ventilation, air conditioning, power and security) are operating such
         that the MCF facility is ready to support the integration and test of
         control and communications equipment as required to operate the
         IRIDIUM Communications System, a formal review with the general
         contractor shall be held on-site.

         5.36.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific actions items resulting from the review this milestone
         shall be deemed completed.

5.37     MILESTONE 37   SATELLITE SUBSCRIBER UNIT (VOICE) INTERFACE
         SPECIFICATION COMPLETE

         5.37.1      MILESTONE DESCRIPTION
         This milestone encompasses the issuance of the Satellite Subscriber
         Unit (Voice) Interface Specification.

         5.37.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be deemed complete when Seller delivers to buyer
         the Satellite Subscriber Unit (Voice) Interface Specification and it
         is accepted by Buyer as provided by ARTICLE 8, Acceptance Criteria of
         this contract.

5.38     MILESTONE 38   SPACE NODE TEST REPORT

         5.38.1      MILESTONE DESCRIPTION
         The objective of this milestone is to provide the final test report on
         the space node.  This report shall contain collected and summarized
         data and all conclusions resulting from System level tests for the
         various test configurations as identified in the OT&E Test Plan.  Each
         test will be clearly identified with supporting test procedures,
         identified test equipment, appropriate drawings, and results attained.
         Subjective conclusions included or referenced in each test will be
         clearly identified.

         5.38.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be considered complete when the test report is
         internally issued within Motorola and is made available to the Buyer.

5.39     MILESTONE 38   STEP IV OF TABLE 3.7.1

         5.39.1      MILESTONE DESCRIPTION
         This milestone represents the coverage provided by three planes of
         satellites with one satellite "out" in an outer plane.

         5.39.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when Seller achieves the Space System
         coverage levels for this milestone as referred to in Step IV of Table
         3.7.1.


5.40     MILESTONE 40   BCF INTEGRATION & TEST COMPLETE

         5.40.1      MILESTONE DESCRIPTION
         Upon the completion of the integration and testing of all hardware and
         software of the BCF required to control the IRIDIUM Communications
         System, an approximately one day long Pre-Operations Readiness Review
         shall be conducted at the Seller's facilties to review the ability of
         the System Control Segment BCF to support manned operation of a fully
         operational Constellation.  Compliance with Motorola's internal
         performance-related specification shall be presented.





                                    Page 33
<PAGE>   73
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         5.40.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review, the milestone
         shall be deemed completed.

5.41     MILESTONE 41   MCF INTEGRATION & TEST COMPLETE

         5.41.1      MILESTONE DESCRIPTION
         Upon the completion of the integration and testing of all the hardware
         and software of the MCF required to control the IRIDIUM Communications
         System, an approximately one day long Pre-Operations Readiness Review
         shall be conducted at the Seller's facilities to review the ability of
         the System Control Segment MCF to support manned operations of a fully
         operational Constellation.  Compliance with Motorola's internal
         performance-related specification shall be presented.

         5.41.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review and the establishment by Seller
         of specific action items resulting from the review this milestone
         shall be deemed completed.

5.42     MILESTONE 42   STEP V OF TABLE 3.7.1

         5.42.1      MILESTONE DESCRIPTION
         This milestone represents the coverage provided by four planes of
         satellites with one satellite out in an outer plane.

         5.42.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when Seller achieves the Space System
         coverage levels for this milestone as referred to in Step V of Table
         3.7.1.

5.43     MILESTONE 43   BCF FULLY OPERATIONAL

         5.43.1      MILESTONE DESCRIPTION
         An approximately one day long Operations Readiness Review shall be
         conducted at the Seller's facilities to review the operational status
         of the System Control Segment's Backup Control Facility.  System
         requirement compliance to support the operation of the IRIDIUM
         Communications System shall be presented.  Operator certification
         compliance shall also be presented.

         5.43.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review, establishment by Seller of
         specific action items, and seller's determination that sufficient
         operational capability exists, milestone shall be deemed completed.

5.44     MILESTONE 44   STEP VI OF TABLE 3.7.1

         5.44.1      MILESTONE DESCRIPTION
         This milestone represents the coverage provided by five planes of
         satellites with one satellite out in an outer plane.

         5.44.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when Seller achieves the Space System
         coverage levels for this milestone as referred to in Step VI of Table
         3.7.1.





                                    Page 34
<PAGE>   74
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

5.45     MILESTONE 45   SCS FULLY OPERATIONAL

         5.45.1      MILESTONE DESCRIPTION
         Upon the completion of the pre-operational phase of the Master Control
         Facility and the remaining TTAC facility, an approximately one day
         long Operations Readiness Review shall be conducted at the Seller's
         facilities to review the operational status of the System Control
         Segment.  System requirement compliance to support the operation of
         the IRIDIUM Communications System shall be presented.  Operator
         certification compliance shall also be presented.

         5.45.2      MILESTONE ACCEPTANCE CRITERIA
         Upon Seller's completion of the review, establishment by Seller of
         specific action items, and seller's determination that sufficient
         operational capability exists, the milestone shall be deemed
         completed.

5.46     MILESTONE 46   STEP VII OF TABLE 3.7.1

         5.46.1      MILESTONE DESCRIPTION
         This milestone represents the coverage provided by six planes of
         satellites with one satellite out in an inner plane.

         5.46.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone is completed when Seller achieves the Space System
         coverage levels for this milestone as referred to in Step VII of Table
         3.7.1.

5.47     MILESTONE 47   COMPLETION OF TEST PLAN (FOC)

         5.47.1      MILESTONE DESCRIPTION
         This milestone encompasses the completion of the final incremental
         testing of the Space System in accordance with the Acceptance Plan,
         Exhibit C.

         5.47.2      MILESTONE ACCEPTANCE CRITERIA
         This milestone shall be considered complete upon the earlier of
         Buyer's Acceptance of the Space System as provided by Paragraph C of
         Article 8, Acceptance Criteria, or, Seller's successful completion of
         the Final Acceptance Program as defined in Section 4 of the Acceptance
         Plan (Exhibit C) evidencing compliance of the Space System with the
         specific criteria of this Statement of Work listed in Table 2.2-1 of
         the Acceptance Plan.





                                    Page 35
<PAGE>   75
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

6.0      AVERAGE ACTUAL SERVICE PROVIDED

         The Seller is responsible for demonstrating the operation of the
         IRIDIUM Space System commencing 90 days prior to anticipated FOC or at
         a mutually agreed upon date.  This demonstration shall consist of
         determining the Average Actual Service Provided (AASP) by the Space
         System which includes operating the System Control Segment (SCS)
         facilities in accordance with the Space System Operations Plan.  The
         AASP meansurements shall be made by special test equipment provided by
         the Seller.  The special test equipment shall provide the necessary
         signal formats and calibrated RF signal measurement capability.

6.1      The AASP provides two separate measures of the network performance
         provided to a hypothetical subscriber randomly located anywhere on the
         earth's surface assuming the      *     coverage specified in Step VII
         of Table 3.7.1 has been achieved.  Inasmuch as the 90 day period for
         computing the AASP for purposes of this Contract will likely begin
         prior to Step VII of Table 3.7.1 being achieved, for purposes of
         computing the average AASP over the 90 day period, until Step VII of
         Table 3.7.1 is achieved any satellites not yet launched into their
         final designated orbital location in the constellation shall be
         treated as having been so launched and as being full operational with
         respect to computing the AASP factors.  The AASP data and related
         calculations include separate calculations of factors related to the
         coverage provided to the subscriber by the Space System L-Band
         equipment as well as factors related to the Space System's capability
         to meet the capacity requirements of this contract.  Contractor's
         interpretation of such data and measurements shall be conclusive for
         purposes of the computation of the AASP percentage under this Contract
         absent manifest error, gross negligence or fraud.  The AASP
         percentages shall be computed on a quarterly basis using the following
         formulae:

         X = (A-B)/A

         Y = (A-C)/A

         X = Coverage factor during the evaluation period.

         Y = Capacity factor during the evaluation period.

         A = The total number of seconds in the period.  This will be
         determined by multiplying 60 seconds per minute times 60 minutes per
         hour times 24 hours per day (86,400 seconds) times number of days in
         the period.

         B = a factor that is intended to determine the capability of the Space
         System to provide a L-Band link to a user within specified tolerances
         for the period of performance.  B is calculated as described in
         Paragraph 6.2.





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 36
<PAGE>   76
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

         C = a factor that is intended to determine the capability of the Space
         System to meet the specified system capacities based on the equipment
         downtimes of the individual space vehicle crosslinks, the space
         vehicle gateway/SCS links, and the space vehicle channel capacity.  C
         is calculated as described in Paragraph 6.4.

6.2      CALCULATION OF "B" FACTOR:

         Procedure:

         1)  From telemetry, built-in-test results, or periodic monitoring
         determine the individual space vehicle antenna beams with suspected
         degraded performance and the time that the degraded performance was
         initially detected.  Each antenna beam cluster shall be monitored for
         degradation a minimum of once per day.

         2)  Verify and quantify the extent of degradation of each antenna beam
         identified in step 1) using a calibrated test set.  The downlink
         degradation shall be measured in terms of Power Flux Density (PFD)
         while uplink is measured in terms of Bit Error Rate (BER) for the
         nominal subscriber link per Table 6.2.1.  The BER calculation shall be
         made on a frame by frame basis and averaged over an antenna beam
         pattern and power level.  BER and PFD data will be recorded by
         satellite and individual beam pattern to enable AASP calculations.
         The percent degradation used in the AASP calculation for each antenna
         beam shall be as shown in Table 6.2.1.

         TABLE 6.2.1

         DEGRADATION LEVELS FOR USE IN CALCULATING "B"

         DOWNLINK DEGRADATION

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
PERFORMANCE LEVEL             PFDdbW/sq meter              PERCENT DEGRADATION
- --------------------------------------------------------------------------------
    <S>                               <C>                               <C>




                                      *                                 *


     *



- --------------------------------------------------------------------------------

                                             *
</TABLE>


- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.



                                    Page 37
<PAGE>   77
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


         UPLINK DEGRADATION

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
PERFORMANCE LEVEL                  EIRP DBW                PERCENT DEGRADATION
- --------------------------------------------------------------------------------
        <S>                           <C>                           <C>




                                      *                             *

        *




- --------------------------------------------------------------------------------
</TABLE>




                                       *


         3)  The degradation percentage for each individual antenna beam is
         determined by averaging the uplink and downlink degradation
         percentages.

         4)  Using an astro-dynamics orbital model calculate the number of
         seconds that a hypothetical user at       *     degrees latitude is 
         covered by each degraded antenna beam.  The individual antenna beam
         coverage patterns to be used in this calculation shall be defined in
         the model defined by Seller and presented at the Space System Critical
         Design Review.  The resulting coverage seconds for each degraded
         antenna beam shall be determined by a weighted average of the
         resulting data points.  The weighted average shall be calculated using
         the equation shown below.


                                       *

         (Note:  If the system operator has adjacent beams available to
         partially cover the degraded coverage area and reconfigures the system
         accordingly this will reduce the degrade coverage seconds beginning at
         the time the reconfiguration takes place.)

         5)  Each of the coverage seconds for each antenna beam in the
         constellation are then summed together weighted by the percentage
         degradations calculated in step 3) to determine the total degraded
         coverage seconds to be used in the calculation of the coverage factor
         (X).  The degraded coverage seconds calculated in this step are equal
         to "B".


- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.



                                    Page 38
<PAGE>   78
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work

6.3      MINIMUM COVERAGE FACTOR

         The system shall meet a minimum coverage factor (X) of      *      as
         calculated in accordance with paragraphs 6.0 - 6.6 of the Statement of
         Work, during the 90 days prior to the scheduled FOC date.

6.4      CALCULATION OF "C" FACTOR:

         1)  Channel Capacity Degradation:  Using a model defined by Seller and
         presented at the Space System Critical Design Review calculate the
         capability of each of the antenna beams on each space vehicle in the
         operational constellation to support the Capacity per Beam Traffic     
         Channel Pattern specified in SOW Paragraph 3.3-2.  (The Space System
         shall provide a maximum of   *  concurrent L-Band full duplex traffic
         channels in a single beam pattern.)  This calculation shall be
         performed upon the detection of any failures that affect the
         capability to support the specified capacity.  The failures that
         affect individual space vehicle antenna beam capacity include
         switching failures, modem failures, processor failures, etc.  A
         complete listing of the applicable failures, method of detection, and
         model description will be provided at the Space Segment Critical
         design review.  Calculate the percentage degradation to be used in the
         capacity factor (Y) calculations for each antenna beam based on the
         calculated traffic channel subscriber capacity per beam as shown in
         Table 6.3-1.

         TABLE 6.3-1

         TRAFFIC CHANNEL CAPACITY PER BEAM DEGRADATION PERCENTAGES

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
VOICE SUBSCRIBER CAPACITY                           DEGRADATION PERCENTAGE USED
       PER BEAM                                          IN AASP CALCULATION
- --------------------------------------------------------------------------------
          <S>                                                     <C>









          *                                                       *








- --------------------------------------------------------------------------------
</TABLE>


- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 39
<PAGE>   79
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


         2)  Using an astro-dynamics orbital model calculate the number of
         seconds that a hypothetical user at         *           degrees 
         latitude is covered by each antenna beam with degraded capacity.  
         The individual antenna beam coverage patterns to be used in this 
         calculation shall be defined in the model defined by Seller and 
         presented at the Space System Critical Design Review.  The resulting 
         coverage seconds for each degraded antenna beam shall be determined 
         by a weighted average of the resulting data points.  The weighted 
         average shall be calculated using the equation shown below.


                                       *


         (Note:  If the system operator has adjacent beams available to
         partially cover the degraded coverage area and reconfigures the system
         accordingly this will reduce the degraded coverage seconds beginning
         at the time the reconfiguration takes place.)

         3)  Each of the coverage seconds for each antenna beam in the
         constellation are then summed together weighted by the percentage
         degradations calculated in step 1) to determine the total degraded
         coverage to be used in the calculation of the capacity factor (Y).
         The degraded coverage seconds for each antenna beam cannot exceed 100%
         of the total coverage seconds for that beam.  For example if the beam
         has totally failed the coverage as calculated in Paragraph 6.2, no
         additional degradation is taken for beam capacity for that beam.

         4)  Crosslink Degradation:  Identify critical failures in the space
         vehicle crosslink subsystems and the time duration of the critical
         failure.  (Note: a critical failure is one that causes the associated
         crosslink to become non-operational) Calculate the percentage
         degradation for each space vehicle based on the percentages shown in
         Table 6.3-2.





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 40
<PAGE>   80
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


         TABLE 6.3-2

         CROSSLINK DEGRADATION PERCENTAGES

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------
                      NO. OF IN-PLANE         NO. OF CROSS-PLANE              PERCENT
SV PLANE            CROSSLINK FAILURES        CROSSLINK FAILURES           DEGRADATION
- ----------------------------------------------------------------------------------------
  <S>                        <C>                      <C>                       <C>






  *                          *                        *                         *






- ----------------------------------------------------------------------------------------
</TABLE>





5)  Space Vehicle to SCS/Gateway Link Degradation:  Identify critical failures
in the space vehicle gateway subsystems and the time duration of the critical
failure.  (Note: a critical failure is one that causes the associated
Gateway/SCS link to become non-operational)  Calculate the percentage
degradation for each space vehicle based on the percentages shown in Table
6.3-3.

TABLE 6.3-3

SV GATEWAY ANTENNA DEGRADATION PERCENTAGES

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------
NO. OF SV GATEWAY                                 PERCENT DEGRADATION
ANTENNA FAILURES
- -----------------------------------------------------------------------
        <S>                                                <C>



        *                                                  *



- -----------------------------------------------------------------------
</TABLE>



6)  Total SV K-Band Link Degradation:  For each space vehicle the percent total
degradation for crosslinks and Gateway/SCS failures will then be calculated by
summing the individual degradations determined in steps 4) and 5).  If the sum
exceeds 100%, it will be deemed to be 100%.



- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                    Page 41
<PAGE>   81
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


7)  Using an astro-dynamics orbital model calculate the number of seconds that
a hypothetical user at        *           degrees latitude is covered by each
space vehicle with failed K-Band links.  The individual space vehicle
coverage patterns to be used in this calculation shall be defined in the model
presented by Seller at the Space System Critical Design Review.  The resulting
coverage seconds for each degraded space vehicle shall be determined by a
weighted average of the resulting data points.  The weighted average shall be
calculated using the equation shown below.


                                       *


(Note:  If the system operator has adjacent beams available to partially cover
the degraded coverage area and reconfigures the system accordingly this will
reduce the degraded coverage seconds beginning at the time the reconfiguration
takes place.)

8)  Each of the coverage seconds for each degraded space vehicle are then
summed together weighted by the percentage degradations calculated in step 6)
to determined the total degraded coverage seconds for K-Band link failures to e
used in the calculation of the capacity factor (Y).

9)  The total degraded coverage seconds is the sum of the degraded coverage
seconds calculated in steps 3) and 8).  The degraded coverage seconds
calculated in this step are equal to "C".

6.5      MINIMUM CAPACITY FACTOR

         The system shall meet a minimum Capacity Factor (Y) of    *     as
         calculated in accordance with paragraphs 6.0 - 6.6 of the Statement of
         Work, during the    *     prior to the scheduled FOC date.

6.6      The following examples illustrate the application of the formulas in
         this section to five (5) hypothetical factual situations.

         6.6.1  Example 1 (AASP Coverage Factor Example)



         *



         6.6.2  Example 2 (AASP Coverage Factor Example)





         *





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 42
<PAGE>   82
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work


         *


         6.6.3  Example 3 (AASP Coverage Factor Example)


         *



         6.6.4  Example (AASP Capacity Factor Example)



         *



         6.6.5  Example (AASP Coverage and Capacity Factors Example)



         *





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 43
<PAGE>   83
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work











                                       *





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 44
<PAGE>   84
IRIDIUM Space System Contract
                                   EXHIBIT B
                               Statement of Work





                                       *





7.0          DOCUMENTATION CONTROL

             The seller shall develop a documentation control system to
             maintain control of all final design documents to allow the
             orderly development of the IRIDIUM Communications System.
             Documents contained within the seller's document control system
             shall be available for review by the buyer upon reasonable notice
             and on a non-interference basis.





- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                    Page 45
<PAGE>   85
IRIDIUM Space System Contract
                                   EXHIBIT C
                               ACCEPTANCE PLAN


1.0      INTRODUCTION

         This exhibit details the final Acceptance Test program that is
         intended to be the basis for the IRIDIUM(R) Space System acceptance.
         The final acceptance test program consists of a test and analysis
         program that includes simulations, analyses, and developmental test
         activities.  The final acceptance test program will make use of an
         orbit self-test diagnostics and Space Segment and System Control
         Segment lower level test results to confirm operation of all elements
         of the Space System.  See Exhibit B, Statement of Work, for the
         glossary of terms used in this document.  Seller's interpretation of
         the testing, analyses, inspection and demonstrations conducted by
         Seller shall be conclusive for purposes of determining compliance with
         the specified provisions of the Statement of Work absent manifest
         error, gross negligence or fraud.

2.0      ACCEPTANCE PROGRAM OVERVIEW

         2.1 Test Philosophy

             Final acceptance testing of the Space System will take place
             incrementally.  Testing will begin when the Backup Control
             Facility, two associated TTAC Facilities and a partial
             constellation are available.  Acceptance testing will be performed
             and analysis completed to verify that the System Control
             Facilities and space vehicles operate as designed and as
             previously documented by other testing.  As new Space Vehicles are
             inserted in the Constellation they will be tested to verify their
             performance before entering an operational state in the
             constellation.  All acceptance testing will be performed utilizing
             operational Space System hardware and software and gateway and
             subscriber unit simulators.

             The acceptance of the Master Control Facility and the remaining
             TTAC Facility shall be accomplished by employing the Master
             Control Facility and the remaining TTAC Facility during the
             incremental acceptance of one of the Space Vehicles.

             During the quarter preceding FOC the data required to support the
             calculation of the Average Actual Service Provided (AASP) will be
             accumulated for presentation as part of the IRIDIUM Space System
             Acceptance report at FOC.

         2.2 Verification Matrix

             A verification matrix listing each SOW requirement and the method
             of verification is included as Table 2.2-1.

             The methods of verification include:

                     A - Analysis
                     T - Test
                     D - Demonstration
                     I - Inspection

             A definition of each method of verification is included in the
             glossary of terms, section 2.2 of the SOW.





                                     Page 1
<PAGE>   86
IRIDIUM Space System Contract
                                   EXHIBIT C
                                ACCEPTANCE PLAN


                Table 2.2.1 Acceptance Plan Verification Matrix
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
SOW                                                                              TEST
PARA.                                                               VERIF.        PLAN
NO.                          REQUIREMENT TITLE                      METHOD       PARA.          COMMENTS
- -----------------------------------------------------------------------------------------------------------
<S>       <C>                                                     <C>         <C>         <C>

         --------------------------------------------------------
                      3.0 CONSTELLATION REQUIREMENTS
         --------------------------------------------------------
          3.1 CONSTELLATION CONFIGURATION
- -----------------------------------------------------------------------------------------------------------
3.1-1     PROVIDE CONTINUOUS COVERAGE                             A           5.16.3
- -----------------------------------------------------------------------------------------------------------
3.1-2     ANTENNA BEAMS                                           A           5.16.2      Based on SV Data
- -----------------------------------------------------------------------------------------------------------
3.1-3     NUMBER OF INDEPENDENT LINKS PER SV                      A           5.16.1      Based on SV Data
- -----------------------------------------------------------------------------------------------------------
3.1-4     CONSTELLATION-SCS MINIMUM ELEVATION ANGLES              D           5.10        One time only
- -----------------------------------------------------------------------------------------------------------
3.1-5     SIMULTANEOUS OPERATION OF FEEDER LINKS                  D           5.16.1      Based on SV Data
- -----------------------------------------------------------------------------------------------------------
3.1-6     CROSSLINK COMMUNICATIONS                                D           5.9
- -----------------------------------------------------------------------------------------------------------
3.1-7     CROSSPLANE CROSSLINK OPERATIONAL LIMITATIONS            D           5.9


         --------------------------------------------------------
                      3.2 COMMUNICATIONS REQUIREMENTS
- -----------------------------------------------------------------------------------------------------------
 3.2-1    CONSTELLATION-ISU RF LINK FOR MD AND MCD                D           5.12.1
- -----------------------------------------------------------------------------------------------------------
 3.2-2    CONSTELLATION SUBSCRIBER UPLINK FREQUENCY               D           5.12.1
- -----------------------------------------------------------------------------------------------------------
 3.2-3    CONSTELLATION SUBSCRIBER DOWNLINK FREQUENCY             D           5.12.1
- -----------------------------------------------------------------------------------------------------------
 3.2-4    VOICE/DATA TRAFFIC CHANNEL BURST POWER FLUX             A           5.5
          DENSITY
- -----------------------------------------------------------------------------------------------------------
 3.2.4A   DOWNLINK VOICE/DATA TRAFFIC CHANNEL MAXIMUM             D           5.5
          BER
- -----------------------------------------------------------------------------------------------------------
 3.2-5    VOICE/DATA/ACQUISITION CHANNEL UPLINK C/N               A           5.5
- -----------------------------------------------------------------------------------------------------------
 3.2.5A   UPLINK VOICE/DATA TRAFFIC CHANNEL MAXIMUM BER           D           5.5
- -----------------------------------------------------------------------------------------------------------
 3.2-6    PAGING CHANNEL BURST POWER FLUX DENSITY                 A           5.5
- -----------------------------------------------------------------------------------------------------------
 3.2.6A   PAGING CHANNEL MAXIMUM BER                              D           5.5
- -----------------------------------------------------------------------------------------------------------
 3.2-7    RING ALERT CHANNEL BURST POWER FLUX DENSITY             A           5.5
- -----------------------------------------------------------------------------------------------------------
 3.2.7A   RING ALERT CHANNEL MAXIMUM BER                          D           5.5
- -----------------------------------------------------------------------------------------------------------
 3.2-8    SUBSCRIBER LINK POWER CONTROL                           D           5.5
- -----------------------------------------------------------------------------------------------------------
 3.2-9    GEOLOCATION TIMELINESS/ACCURACY                         A           5.11
- -----------------------------------------------------------------------------------------------------------
 3.2-10   SV-SV LINK FREQUENCY                                    D           5.12.2
- -----------------------------------------------------------------------------------------------------------
 3.2-11   CONSTELLATION-GW RF LINK                                D           5.12.2
- -----------------------------------------------------------------------------------------------------------
 3.2-12   CONSTELLATION-SCS RF LINKS                              D           5.12.2
- -----------------------------------------------------------------------------------------------------------
 3.2-13   PROVIDE SECONDARY COMM SYSTEM                           D           5. 2
- -----------------------------------------------------------------------------------------------------------
 3.2-14   UPLINK FREQUENCY                                        D           5.12.2
- -----------------------------------------------------------------------------------------------------------
 3.2-15   DOWNLINK FREQUENCY                                      D           5.12.2
- -----------------------------------------------------------------------------------------------------------
 3.2-16   FEEDER LINK POWER CONTROL                               D           5.12.2
- -----------------------------------------------------------------------------------------------------------


         --------------------------------------------------------
                               3.3  CAPACITY
- -----------------------------------------------------------------------------------------------------------
 3.3-1    PAGING CAPACITY                                         A           5.16.1      Based on SV Data
- -----------------------------------------------------------------------------------------------------------
 3.3-2    VOICE SUBSCRIBER CAPACITY PER BEAM PATTERN              A           5.16.1      Based on SV Data
- -----------------------------------------------------------------------------------------------------------
 3.3-3    PEAK CAPACITY PER ANTENNA BEAM CLUSTER                  A           5.16.1      Based on SV Data
- -----------------------------------------------------------------------------------------------------------
 3.3-4    PEAK SUBSCRIBER LINK CAPACITY PER SV                    A           5.16.1      Based on SV Data
- -----------------------------------------------------------------------------------------------------------
 3.3-5    AVERAGE SUBSCRIBER LINK TRAFFIC LOAD PER SV             A           5.16.1      Based on SV Data
          PER ORBIT
- -----------------------------------------------------------------------------------------------------------
 3.3-6    CONSTELLATION-GATEWAY CAPACITY                          D           5.10
- -----------------------------------------------------------------------------------------------------------


         --------------------------------------------------------
                         3.4 CONSTELLATION CONTROL
- -----------------------------------------------------------------------------------------------------------
 3.4-1    UNAUTHORIZED COMMAND ATTEMPTS                           D           5.13
- -----------------------------------------------------------------------------------------------------------
 3.4-2    MONITOR MISSION CRITICAL PARAMETERS                     D           5.2
- -----------------------------------------------------------------------------------------------------------
 3.4-3    FAULT RESPONSES                                         D           5.2
- -----------------------------------------------------------------------------------------------------------
 3.4-4    RECONFIGURATION DUE TO NODE/LINK FAILURE                D           5.13
- -----------------------------------------------------------------------------------------------------------
 3.4-5    CONDUCT PM WITHOUT DEGRADING PERFORMANCE                A
- -----------------------------------------------------------------------------------------------------------
 3.4-6    PROCESS COMMANDS BY TYPE                                D           5.2
- -----------------------------------------------------------------------------------------------------------
</TABLE>




                                     Page 2
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                                   EXHIBIT C
                                ACCEPTANCE PLAN

                Table 2.2.1 Acceptance Plan Verification Matrix
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
SOW                                                                              TEST
PARA.                                                               VERIF.        PLAN
NO.                          REQUIREMENT TITLE                      METHOD       PARA.          COMMENTS
- -----------------------------------------------------------------------------------------------------------
<S>      <C>                                                     <C>         <C>         <C>
- -----------------------------------------------------------------------------------------------------------
3.4-7    SV COMMAND AUTHENTICATION                               D           5.13
- -----------------------------------------------------------------------------------------------------------
3.4-8    UPLINK AND LOAD SOFTWARE UPON COMMAND                   D           5.13
- -----------------------------------------------------------------------------------------------------------
3.4-9    ROUTE TELEMETRY TO THE SCS                              D           5.1
- -----------------------------------------------------------------------------------------------------------
3.4-10   RESPOND TO SCS COMMANDS FOR SPECIFIC DATA               D           5.2
- -----------------------------------------------------------------------------------------------------------
3.4-11   REPORT FAILED COMMAND ATTEMPTS TO SCS                   D           5.2
- -----------------------------------------------------------------------------------------------------------
3.4-12   RECEIVE COMMANDS FROM SCS                               D           5.2
- -----------------------------------------------------------------------------------------------------------
3.4-13   MESSAGE ROUTING                                         D                       Demo during other
                                                                                         testing
- -----------------------------------------------------------------------------------------------------------
3.4-14   SV DE-BOOST                                             A           5.3
- -----------------------------------------------------------------------------------------------------------
3.4-15   SAFE MODE                                               D           5.2
- -----------------------------------------------------------------------------------------------------------


         --------------------------------------------------------
                      3.5 CONSTELLATION OPERATIONS
- -----------------------------------------------------------------------------------------------------------
3.5-1    GEOGRAPHIC BASED SERVICE RESTRICTIONS                   D           5.11
- -----------------------------------------------------------------------------------------------------------
3.5-2    PROCESS CHANNEL REQUEST                                 D           5.16.1
- -----------------------------------------------------------------------------------------------------------
3.5-3    HANDOFF BETWEEN ANTENNA BEAMS                           D           5.8
- -----------------------------------------------------------------------------------------------------------
3.5-4    CONSTELLATION CONTRIBUTION TO REGISTRATION              T           5.7
          ACTIVITY
- -----------------------------------------------------------------------------------------------------------
3.5-5    CONSTELLATION DELAY FOR CALL SETUP                      A           5.7
- -----------------------------------------------------------------------------------------------------------
3.5-6    TOTAL SV DELAY FOR VOICE COMMUNICATIONS                 A           5.6
- -----------------------------------------------------------------------------------------------------------
3.5-7    PROVIDE EIGHT LEVELS OF PRECEDENCE                      D           5.7
- -----------------------------------------------------------------------------------------------------------
3.5-8    CALL IMAGE DATA TO GW                                   D           5.8
- -----------------------------------------------------------------------------------------------------------

         --------------------------------------------------------
                     3.6 ENVIRONMENTAL REQUIREMENTS
- -----------------------------------------------------------------------------------------------------------
3.6-1    AVOID INTERFERENCE WITH OTHER SYSTEMS                   A
- -----------------------------------------------------------------------------------------------------------
3.6-2    ORBITAL DEBRIS                                          A
- -----------------------------------------------------------------------------------------------------------

         --------------------------------------------------------
                        3.7 COVERAGE REQUIREMENTS
- -----------------------------------------------------------------------------------------------------------
3.7-1    EARLY CONSTELLATION COVERAGE                            A           5.16.3      Based on SV Data
- -----------------------------------------------------------------------------------------------------------

         --------------------------------------------------------
                          4.0 SCS REQUIREMENTS
         --------------------------------------------------------
         4.1 MONITOR AND CONTROL REQUIREMENTS
- -----------------------------------------------------------------------------------------------------------
4.1-1    MAINTAIN CONSTELLATION FAULT RESPONSE CRITERIA          D           5.1
- -----------------------------------------------------------------------------------------------------------
4.1-2    REQUEST DIAGNOSTICS                                     D           5.2
- -----------------------------------------------------------------------------------------------------------
4.1-3    PROCESS TELEMETRY                                       D           5.1
- -----------------------------------------------------------------------------------------------------------
4.1-4    GENERATE CONSTELLATION COMMANDS                         D           5.2
- -----------------------------------------------------------------------------------------------------------
4.1-5    AUTHENTICATION COMMAND COUNT                            D           5.2
- -----------------------------------------------------------------------------------------------------------
4.1-6    GENERATE SINGLE OR STACKED COMMANDS                     D           5.2
- -----------------------------------------------------------------------------------------------------------
4.1-7    COMMAND DESIGNATION                                     D           5.2
- -----------------------------------------------------------------------------------------------------------
4.1-8    GENERATE EPHEMERIS FOR SYSTEM OPS                       D           5.3
- -----------------------------------------------------------------------------------------------------------
4.1-9    ORBIT DETERMINATION                                     D           5.3
- -----------------------------------------------------------------------------------------------------------
4.1-10   KNOWLEDGE BOX                                           D           5.3
- -----------------------------------------------------------------------------------------------------------
4.1-11   PLAN MANUEVERS AND GENERATE COMMANDS                    D           5.3
- -----------------------------------------------------------------------------------------------------------
4.1-12   CONTROL BOX                                             D           5.3
- -----------------------------------------------------------------------------------------------------------
4.1-13   SPARED SV CLOCK ACCURACY                                A
- -----------------------------------------------------------------------------------------------------------
4.1-14   GENERATE DTOA VALUES                                    D           5.4
- -----------------------------------------------------------------------------------------------------------
4.1-15   COMMANDS TO MAINTAIN PARKING ORBIT                      D           5.3
- -----------------------------------------------------------------------------------------------------------
4.1-16   MANAGE CONSTELLATION POWER                              D           5.2
- -----------------------------------------------------------------------------------------------------------
4.1-17   PREDICT CONSTELLATION THERMAL CONDITIONS                D           5.1
- -----------------------------------------------------------------------------------------------------------
4.1-18   COMMAND SV TO ORBIT                                     D           5.3
- -----------------------------------------------------------------------------------------------------------
</TABLE>





                                     Page 3
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                                   EXHIBIT C
                                ACCEPTANCE PLAN

                Table 2.2.1 Acceptance Plan Verification Matrix
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
SOW                                                                              TEST
PARA.                                                               VERIF.        PLAN
NO.                          REQUIREMENT TITLE                      METHOD       PARA.          COMMENTS
- -----------------------------------------------------------------------------------------------------------
<S>      <C>                                                     <C>         <C>         <C>
- -----------------------------------------------------------------------------------------------------------
4.1-19   PERFORM ON ORBIT TESTING                                D           5.2
- -----------------------------------------------------------------------------------------------------------
4.1-20   LOCATE SV IN ANOMALOUS OR UNKNOWN ORBITS                A
- -----------------------------------------------------------------------------------------------------------
4.1-21   MANAGE  LAUNCH PLANS & SCHEDULES                        D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-22   DETECT NODE/LINK FAILURES                               D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-23   ESTABLISH ALT ROUTES                                    D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-24   SET MAX NUMBER OF CROSSLINKS TRAVERSED                  D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-25   CONTROL ANTENNA BEAM ACTIVATION                         D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-26   CONTROL OF OPERATIONAL ELEMENTS                         D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-27   RECONFIGURATION DUE TO MULTIPLE FAILURES                D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-28   MANAGE  PSTN PHONE NUMBER TO GW MAP                     D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-29   MANAGE  PHONE NUMBER TO GW MAP                          D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-30   ASSIGN CALL SETUP RESPONSIBILITIES                      D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-31   REASSIGN CALL SETUP SERVICE AREAS                       D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-32   MULTIPLE GW FAILURES                                    A
- -----------------------------------------------------------------------------------------------------------
4.1-33   UPDATE PHONE NUMBER MAP                                 A
- -----------------------------------------------------------------------------------------------------------
4.1-34   MAP UPDATE FOR MULTIPLE FAILURES                        A
- -----------------------------------------------------------------------------------------------------------
4.1-35   SCHEDULE FEEDER LINKS                                   A
- -----------------------------------------------------------------------------------------------------------
4.1-36   MANAGE SV DATA                                          A           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-37   PROVIDE CAPABILITY TO TEST ALL LINKS                    D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-38   MASTER SERVICE DENIAL LIST                              D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-39   MANAGE SERVICE RESTRICTIONS                             D           5.11
- -----------------------------------------------------------------------------------------------------------
4.1-40   MAINTAIN GW FAULT RESPONSE CRITERIA                     D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-41   REQUEST GW DIAGNOSTICS                                  A
- -----------------------------------------------------------------------------------------------------------
4.1-42   MONITOR SCS CRITICAL PARAMETERS                         D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-43   EXECUTE FAULT RESPONSES                                 D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-44   AVOID INTERFERENCE WITH OTHER SYSTEMS                   A
- -----------------------------------------------------------------------------------------------------------
4.1-45   GRACEFUL DEGRADATION                                    A
- -----------------------------------------------------------------------------------------------------------
4.1-46   MANAGE SOFTWARE/HARDWARE CONFIGURATION                  D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-47   SV-SCS CHANNEL CAPACITY                                 D           5.10
- -----------------------------------------------------------------------------------------------------------
4.1-48   MONITOR RECEIVED DATA AND GENERATE ALARMS               D           5.1
- -----------------------------------------------------------------------------------------------------------
4.1-49   SYSTEM MASTER CLOCK                                     D           5.4
- -----------------------------------------------------------------------------------------------------------
4.1-50   MISSION CONSTELLATION CLOCK ACCURACY                    D           5.4
- -----------------------------------------------------------------------------------------------------------
4.1-51   SV-SCS PRIMARY DOWNLINK SCD BER                         A           5.10
- -----------------------------------------------------------------------------------------------------------
4.1-52   SV-SCS SECONDARY DOWNLINK SCD BER                       A           5.10
- -----------------------------------------------------------------------------------------------------------
4.1-53   UNAUTHORIZED COMMAND ATTEMPTS                           D           5.13
- -----------------------------------------------------------------------------------------------------------
4.1-54   MINIMIZE ORBITAL DEBRIS                                 A
- -----------------------------------------------------------------------------------------------------------
4.1-55   PHYSICAL AND COMPUTER SECURITY                          D           5.13
- -----------------------------------------------------------------------------------------------------------

         --------------------------------------------------------
                             4.2 INTERFACES
- -----------------------------------------------------------------------------------------------------------
4.2-1    PROVIDE SV KNOWLEDGE BOX UPDATES                        D           5.3
- -----------------------------------------------------------------------------------------------------------
4.2-2    GW-SCS CALL DETAIL RECORD TRANSMISSION FREQUENCY        D           5.13
- -----------------------------------------------------------------------------------------------------------
4.2-3    EXCHANGE SCD WITH GATEWAYS                              D                       Demonstrate at SCS
                                                                                          level
- -----------------------------------------------------------------------------------------------------------
4.2-4    EXCHANGE NOD WITH GATEWAYS                              D                       Demonstrate at SCS
                                                                                          level
- -----------------------------------------------------------------------------------------------------------
4.2-5    SATELLITE EPHEMERIS DATA FOR RA                         A
- -----------------------------------------------------------------------------------------------------------
4.2-6    RADIO ASTRONOMY SCHEDULING INTERFACE                    A
- -----------------------------------------------------------------------------------------------------------
4.2-7    SV-SCS LINK CAPACITY                                    D           5.2
- -----------------------------------------------------------------------------------------------------------
4.2-8    TRANSPARENCY OF HANDOFFS                                D           5.8
- -----------------------------------------------------------------------------------------------------------
4.2-9    SV-SCS PRIMARY RF LINK                                  D           5.2
- -----------------------------------------------------------------------------------------------------------
4.2-10   SV-SCS SECONDARY RF LINK                                D           5.2
- -----------------------------------------------------------------------------------------------------------
4.2-11   ADJUST EIRP                                             D                       Demonstrate at SCS
                                                                                          level
- -----------------------------------------------------------------------------------------------------------
</TABLE>
                                     Page 4
<PAGE>   89
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                                   EXHIBIT C
                                ACCEPTANCE PLAN

                Table 2.2.1 Acceptance Plan Verification Matrix
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
SOW                                                                              TEST
PARA.                                                               VERIF.        PLAN
NO.                          REQUIREMENT TITLE                      METHOD       PARA.          COMMENTS
- -----------------------------------------------------------------------------------------------------------
<S>      <C>                                                     <C>         <C>         <C>
- -----------------------------------------------------------------------------------------------------------
4.2-12   MEASURE/REPORT RECEIVED POWER                           D           5.2
- -----------------------------------------------------------------------------------------------------------
4.2-13   SCS-GW FEEDER LINK                                      D           5.13
- -----------------------------------------------------------------------------------------------------------
4.2-14   SCS-GW SECURE COMMERCIAL COMM LINK                      D                       Demonstrate at SCS
                                                                                          level
- -----------------------------------------------------------------------------------------------------------
4.2-15   SCS-SPACE LAUNCH OPERATIONS INTERFACE                   D                       Pre-Launch Tests
- -----------------------------------------------------------------------------------------------------------
4.2-16   SCS UPLINK FREQUENCY                                    D           5.12.2
- -----------------------------------------------------------------------------------------------------------
4.2-17   SCS DOWNLINK FREQUENCY                                  D           5.12.2
- -----------------------------------------------------------------------------------------------------------
4.2-18   PROVIDE TIME OFFSETS                                    D           5.13
- -----------------------------------------------------------------------------------------------------------

         --------------------------------------------------------
         4.3 MAINTAINABILITY REQUIREMENTS
- -----------------------------------------------------------------------------------------------------------
4.3-1    CONDUCT PM WITHOUT DEGRADING PERFORMANCE                A
- -----------------------------------------------------------------------------------------------------------
4.3-2    DIAGNOSTICS WITHOUT SERVICE DEGRADATION                 A
- -----------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------
6.1      AVERAGE ACTUAL SERVICE PROVIDED                         A           4.0
- -----------------------------------------------------------------------------------------------------------
</TABLE>





         2.3 Test Failures/Retest Philosophy

             Any of the Acceptance tests or demonstrations that do not meet the
             specified requirements will be formally documented as a test
             discrepancy.  On the occurrence of a test discrepancy the testing
             will proceed in parallel with an investigation to determine the
             probable cause and the planned disposition.

             Failed space vehicles identified during the initial phases of the
             Acceptance program will be de-orbited only if they meet the Seller
             defined de-orbit criteria.  Replacement of space vehicles during
             the final phase of the Acceptance program will be as determined by
             Seller as required to meet the AASP criteria defined in SOW
             Paragraph 6.0.

             Failures due to design deficiencies may require redesign of the
             affected hardware or software or a formally negotiated change to
             the applicable SOW requirement.  Retest of any redesigned hardware
             or software shall be limited to a retest of the portion of the
             original procedure that failed and any portion that was affected
             by the changes made to the hardware or software.





                                     Page 5
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                                   EXHIBIT C
                                ACCEPTANCE PLAN


3.0      ACCEPTANCE PROGRAM PHASE DESCRIPTIONS

         3.1 Space Node

             The first phase of the Acceptance Program will encompass the
             testing associated with a Space Node.  A Space Node configuration
             consists of one Space Vehicle capable of utilizing its forward and
             backward crosslinks, and that same Space Vehicle capable of
             utilizing its plane to plane crosslink with other Space Vehicles.
             The types of Acceptance tests to be run to test Space Node are
             shown in Table 3.1-1.

                                 Table 3.1-1
             Acceptance Tests to be Performed at Each Test Phase


<TABLE>
<CAPTION>
                                         -------------------------------------------------
                                                           Test Phase
- ------------------------------------------------------------------------------------------
Test Plan            Test Type             Segment Test   Space Node     Incremental
Para. No.                                                                Acceptance
- ------------------------------------------------------------------------------------------
   <S>        <C>                               <C>            <C>            <C>
   5.1        Telemetry Processing                             X              X
   5.2        Command and Control                              X              X
   5.3        Flight Dynamics                                  X              X
   5.4        System Synchronization                           X
   5.5        L-Band Characteristics                           X              X
   5.6        Time Delay                                       X              X
   5.7        Call Setup                                       X              X
   5.8        Handoffs                                         X
   5.9        SV Crosslink                                     X
   5.10       Feeder Links                                     X              X
   5.11       Geolocation                                      X
   5.12       Frequency of Operation                           X              X
   5.13       System Operations                                X
   5.15       Interface Compatibility                          X
   5.16       Lower Level Test Data Rqmnts      X
- ------------------------------------------------------------------------------------------
</TABLE>

             More detailed discussions on each of these test types is included
             in Section 5.0.

             Additional space vehicles or SCS facilities added after the
             completion of Space Node testing will undergo the incremental
             acceptance testing as defined in paragraph 3.2 below.  Space
             System tests shall be limited to those necessary to constitute
             Space Vehicle acceptance and shall not retest existing Space
             Vehicles in the network directly.

         3.2 Incremental Acceptance

             Incremental Acceptance testing refers to intersegment testing that
             will be conducted when additional space vehicles or SCS facilities
             (Master Control Facility (MCF), TTAC West) are integrated into the
             Space System after the completion of the Space Node testing.  The
             types of tests to be run during Incremental Acceptance are shown
             in Table 3.1-1.  More detailed





                                     Page 6
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IRIDIUM Space System Contract
                                   EXHIBIT C
                                ACCEPTANCE PLAN

             discussions on each of these test types is included in Section
             5.0.  Acceptance of the Master Control Facility and remaining TTAC
             Facility shall occur upon the successful addition of any Space
             Vehicle to the Constellation using the Master Control Facility and
             remaining TTAC Facility for control of the network and
             constellation during any such Space Vehicle incremental acceptance
             Tests.

4.0      ACCEPTANCE COMPLETION

         Completion of milestone 47 and acceptance of the Space System occurs
         on the date of Seller's successful completion of all tests required in
         paragraphs 3.1 and 3.2 of this exhibit demonstrating compliance with
         the specific listed criteria of the Statement of Work, the completion
         of a coverage analysis that verifies the coverages listed as step VII
         of Table 3.7.1 of the SOW, and calculation of the Average Actual
         Service Provided (AASP) coverage and capacity factors of at least *
         for a ninety (90) day period preceding such date.  The calculation of
         the AASP is as described in Section 6.0 of the Statement of Work.  The
         Acceptance Completion will include the preparation of an IRIDIUM Space
         System Acceptance report.  The IRIDIUM Space System Acceptance report
         shall contain collected and summarized data that has been compared to
         the functional requirements.  The report will also include the results
         from network analyses and other conclusions resulting from this
         acceptance testing.

5.0      DEFINITION OF TEST TYPES - The specific procedures to be employed in
         the conducting of these tests shall be specified in the ATP procedures
         to be developed by Seller.

         5.1 Telemetry Processing

             During this test the control facility will be operating in
             primarily a passive role where it's primary function is to receive
             and process the critical constellation telemetry data.  The
             digital telemetry data collected will be compared to maximum and
             minimum limits.  Time elapsed graphics will also be available for
             display.

         5.2 Command and Control

             The Command and Control test will be executed on all Space
             Vehicles.  During this test the control facility will exercise a
             Seller defined set of remote commands, beginning with the least
             critical ones and verify the correct execution.  During this test
             selected Built-in-Test routines will be executed by the Space
             Vehicle and the results reviewed at the control facility.
             Commands supporting the safe mode operation will also be
             exercised.

         5.3 Flight Dynamics

             The purpose of this test will be to demonstrate the capability to
             determine the satellite position and perform any necessary station
             keeping maneuvers.  During this test periodic ranging measurements
             will be made

- ----------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.



                                     Page 7
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IRIDIUM Space System Contract
                                   EXHIBIT C
                                ACCEPTANCE PLAN

             and the data will be recorded in the control center.  After
             sufficient data has been collected such that an accurate estimate
             of the orbit can be made the next orbital maneuver will be planned
             and executed.  The space vehicle response will then be analyzed to
             ensure the result is within the expected limits.

         5.4 System Synchronization

             System Synchronization shall be verified by collecting DTOA and
             range precorrection values for both ends of the feeder link.

         5.5 L-Band Characteristics

             L-band IRIDIUM Subscriber Unit interface characteristics shall be
             verified by test of a single channel for a minimum of six cells
             within each Space Vehicle of the constellation.  L-Band paging
             interface characteristics shall be verified by testing of each
             Space Vehicle of the Constellation.  The testing shall be
             performed by initiating voice and paging activities using the
             subscriber and gateway simulators and measuring the power spectral
             density and BER of the paging, ring-alert, and voice channel
             downlinks using a calibrated test set with a directional tracking
             antenna.  The testing will also include measurements of the L-Band
             uplink BER for fixed values of EIRP consistent with the
             requirements of SOW paragraph 3.2-5.  All testing will be
             performed at the earth's surface in locations with a clear
             unobstructed view of the servicing space vehicle.

         5.6 Time Delay

             Voice data communications delay shall be verified by test.  The
             time delay of a voice channel between the gateway simulator and
             the subscriber simulator shall be measured when both are serviced
             by the same Space Vehicle and again when they are serviced by an
             adjacent space vehicle.

         5.7 Call Setup

             Call Setup shall be verified by establishing a voice link through
             the system using the subscriber and gateway simulators and
             measuring the Space System contribution to the call setup time as
             well as the Space System contribution to the time required to
             register a subscriber unit.

         5.8 Handoffs

             A demonstration of transparency of handoffs shall be accomplished
             by establishing a voice link through the system using the
             subscriber and gateway simulators.  This link will be maintained
             for a series of tests during which at least three Space Vehicles
             will traverse the subscriber simulator test site thereby
             demonstrating both the cell to cell handoff and the handoff from
             one Space Vehicle to another Space Vehicle and finally a third
             Space Vehicle.  Measurements of dropped calls and link integrity
             will be performed during the testing.





                                     Page 8
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                                   EXHIBIT C
                                ACCEPTANCE PLAN


        5.9  SV Crosslink

             SV Crosslink performance shall be verified by sending test packets
             between two gateway simulators and checking the bit error rate on
             the received data.  This demonstration will not be sufficient to
             characterize the individual link bit error rate performance, it
             will intended to only be a demonstration that packets can be sent
             through the crosslinks and received with a very low error rate.
             Space node testing will include simultaneous testing of all four
             crosslinks for a single spacecraft.

        5.10 Feeder Links

             Gateway link capacity shall be verified by routing test packets
             between two earth terminals with the Gateway channel load at
             maximum capacity.  This demonstration will not be sufficient to
             characterize the individual link bit error rate performance, it
             will intended to only be a demonstration that packets can be sent
             through the Feeder links and received with a very low error rate.

        5.11 Geolocation

             Geolocation shall be verified by using the subscriber simulator to
             initiate a service request.  During the service request process it
             will be demonstrated that a radio determination of location is
             accomplished by the gateway simulator for use in handover
             assistance.  During this test the capability to deny service based
             on geographical location will also be demonstrated.

        5.12 Frequency of Operation

             5.12.1  L-Band Frequency

                     Frequency of operation of each Space Vehicle shall be
                     verified during subtier testing.  Performance of the
                     constellation shall be verified using the subscriber and
                     gateway simulators and establishing L-band links at
                     lowband edge, midband and high band edge for each Space
                     Vehicle of the constellation.

             5.12.2  K-Band Frequency

                     K-band gateway links shall be tested by using the gateway
                     simulator and System Control Facilities to command
                     operation of each K-band link frequency.  Frequency
                     verification of Space Vehicle to Space Vehicle frequencies
                     shall be by demonstration of continued system operation as
                     the available sets of frequencies are utilized.

        5.13 System Operations
        
             The ability of the System Control Segment to manage the
             system hardware/software configurations, manage software
             uploads, and detect unauthorized command attempts will be
             demonstrated.  Additional SCS operational capabilities
             will also be demonstrated during this one time only test.





                                     Page 9
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IRIDIUM Space System Contract
                                   EXHIBIT C
                                ACCEPTANCE PLAN


             5.14

             5.15    Interface Compatibility

                     Interface documents shall be validated by successful
                     utilization of the subscriber and gateway simulators
                     designed constructed and tested to those documents.

             5.16    Sub-tier Data Required for Supporting Analyses

                     5.16.1  Space Vehicle Capacity

                             Voice Channel Cell capacity, paging capacity, and
                             simultaneous operation of the GW links shall be
                             verified by sub-tier testing and analysis
                             including the loading of a space vehicle processor
                             with simulated call and paging traffic.  During
                             this test the capability to assign a channel or
                             send a service not available indication will also
                             be demonstrated.

                     5.16.2  Antenna Patterns

                             Antenna Beam patterns shall be verified by analysis
                             using orbital station-keeping data from the System
                             Control Segment and antenna beam shape analysis
                             obtained prior to launch.

                     5.16.3  Coverage

                             Space Vehicle coverage shall be verified by 
                             analysis that utilizes the constellation
                             station-keeping data as input into the orbital
                             model presented as part of the Space System
                             Design Review technical data package.




                                    Page 10

<PAGE>   1
                                                                   EXHIBIT 10.7

                                   IRIDIUM(R)

                             COMMUNICATIONS SYSTEM

                           OPERATIONS AND MAINTENANCE

                                    CONTRACT

                                    BETWEEN

                                  IRIDIUM LLC

                                      AND

                                   MOTOROLA

CONTRACT EFFECTIVE DATE: JULY 29, 1993
(CONFORMED 1/14/97 TO INCLUDE AMENDMENTS 1, 2, 3, 4, 5 AND 6)


- ----------------------------------------

IRIDIUM IS A REGISTERED TRADEMARK AND SERVICE MARK OF IRIDIUM LLC





<PAGE>   2



                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
TITLE                                                                   PAGE
- -----                                                                   ----
<S>                                                                       <C>
RECITALS.                                                                  1
ARTICLE 1.   DEFINITIONS.                                                  2
ARTICLE 2.   DESCRIPTION OF WORK.                                          3
ARTICLE 3.   PERFORMANCE SCHEDULE.                                         4
ARTICLE 4.   CONTRACTOR'S COMPENSATION.                                    4
ARTICLE 5.   PAYMENT.                                                      6
ARTICLE 6.   TITLE TRANSFER.                                               6
ARTICLE 7.   CHANGES.                                                      6
ARTICLE 8.   EXCUSABLE DELAYS.                                             7
ARTICLE 9.   OWNER'S ACCESS.                                               7
ARTICLE 10.  REPORTS.                                                      8
ARTICLE 11.  INTELLECTUAL PROPERTY RIGHTS.                                 8
ARTICLE 12.  PATENT INDEMNITY.                                             9
ARTICLE 13.  WARRANTY.                                                    11
ARTICLE 14.  TAXES.                                                       11
ARTICLE 15   PERMITS AND LICENSES.                                        11
ARTICLE 16.  CROSS WAIVER OF LIABILITY.                                   13
ARTICLE 17.  INDEMNIFICATION.                                             14
ARTICLE 18.  INSURANCE.                                                   15
ARTICLE 19.  EXPORT REGULATIONS.                                          15
ARTICLE 20.  DEFAULT BY CONTRACTOR.                                       15
ARTICLE 21.  DEFAULT BY OWNER.                                            17
ARTICLE 22.  EXTENSION TO CONTRACT.                                       18
ARTICLE 23.  TERMINATION OF SPACE SYSTEM CONTRACT.                        18
ARTICLE 24.  NEXT GENERATION SPACE SYSTEM.                                18
ARTICLE 25.  LIMITATION OF LIABILITY.                                     18
ARTICLE 26.  DISCLOSURE AND USE OF INFORMATION BY THE PARTIES.            18
ARTICLE 27.  PUBLIC RELEASE OF INFORMATION.                               19
ARTICLE 28.  ASSIGNMENT.                                                  20
ARTICLE 29.  RELATIONSHIP WITH OTHER AGREEMENTS.                          20
ARTICLE 30.  NOTICES.                                                     20
ARTICLE 31.  AUTHORIZED REPRESENTATIVES.                                  21
ARTICLE 32.  EXHIBITS.                                                    21
ARTICLE 33.  ORDER OF PRECEDENCE.                                         21
ARTICLE 34.  APPLICABLE LAW.                                              21
ARTICLE 35.  ENTIRE AGREEMENT.                                            22
ARTICLE 36.  EFFECTIVE DATE.                                              22
                                                                  
EXHIBIT A   STATEMENT OF WORK                                     
</TABLE>                                                          



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IRIDIUM Operations and Maintenance Contract


                  IRIDIUM OPERATIONS AND MAINTENANCE CONTRACT

THIS CONTRACT is hereby made between Motorola, Inc. (hereinafter called
"Motorola" or "Contractor") a corporation organized under the laws of the State
of Delaware, U.S.A., and Iridium, Inc. (hereinafter called "Owner"), a
corporation organized under the laws of the State of Delaware, U.S.A. The
Effective Date of this Contract is the date specified in ARTICLE 36, EFFECTIVE
DATE.

                                   RECITALS.

A.       On June 26, 1990, Motorola formally announced that it intended to
         develop a global communication system that would allow communication
         via portable radio telephones anywhere on Earth -- whether on land, at
         sea or in the air. The new system, known as IRIDIUM(R), has at the
         heart of its operation, a constellation of nominally sixty-six (66)
         satellites in low-earth orbit working together as a digitally-switched
         communications Space System in space. The system is intended to handle
         both voice and data. One or more ground-based spacecraft control
         facilities will maintain the satellite constellation and overall
         operation of the system.

B.       A key component of the IRIDIUM Communications System will be a Space
         System of "gateway" surface facilities in various countries that will
         link the satellites with the public-switched telephone network. These
         gateways will also store customer billing information and will keep
         track of each user's location.

C.       Other key components to the system are the Subscriber Units (ISUs) and
         Mobile Exchange Units (MXUs).

D.       On June 14, 1991 Motorola incorporated Iridium, Inc. to, among other
         things, become the owner/operator of the Space System portion of the
         IRIDIUM Communications System.

E.       A Space System Contract has been or will be executed to function as
         the mechanism whereby Motorola will sell to Iridium, Inc. the Space
         System portion of the IRIDIUM Communications System.

F.       Separate agreements between Iridium, Inc., Motorola, and/or other
         appropriate parties will provide for the production and sale of the
         Gateways, Subscriber Units, MXUs, and other components of the IRIDIUM
         Communications System. Neither this Contract nor the Space System
         Contract include the development, sale, operation or maintenance of
         the Gateways of the IRIDIUM Communications System.

G.       This contract is intended to function as the vehicle whereby Motorola
         will operate or direct the operation of the entire IRIDIUM
         Communications System, and will maintain the Space System itself by the
         routine replacement of individual space vehicles.


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IRIDIUM Operations and Maintenance Contract


                            ARTICLE 1.  DEFINITIONS

Capitalized terms and the terms specified below used and not otherwise defined
herein shall have the following meanings:

A.       Constellation or Space Segment:  That part of the IRIDIUM
         Communications System consisting solely of the space vehicles (also
         referred to as spacecrafts or satellites) in low-earth orbit.  It does
         not include the System Control Segment, Gateways, ISUs, MXUs or other
         components necessary for complete utilization of the IRIDIUM
         Communications System.

B.       Gateway:  The Gateways encompass the ground-based facilities
         constructed in accordance with the Gateway Interface Specification
         supporting the subscriber billing/information functions in addition to
         call processing operations and the connection of the IRIDIUM
         subscriber communications through the Public Switched Telephone
         Network (PSTN).

C.       Gateway Interface Specification:  The functional specification that
         defines the radio frequency interface, logical and physical protocols,
         and functionality necessary for Gateway interoperability with the
         Space System.  It does not include the voice encoding algorithm
         necessary for complete interoperability with the IRIDIUM
         Communications System.

D.       IRIDIUM Communications Service:  The telephony of voice and data
         service between subscribers and PSTN customers and the paging service
         to subscribers provided by IRIDIUM Communications Systems.

E.       IRIDIUM Communications System (or simply "IRIDIUM"):  The complete
         integrated satellite- based digitally-switched communication system.
         This term refers collectively to the Space Segment, System Control
         Segment, Gateways and Subscriber Unit Segment.

F.       Mobile Exchange Units (MXUs):  The equipment designed to interconnect
         multiple voice or data channels to the IRIDIUM Communications System
         using the subscriber unit radio frequency interface to the Space
         System.

G.       Paging Unit Interface Specification:  The functional specification
         that defines the radio frequency interface, logical and physical
         protocols and paging unit functionality necessary for paging unit
         interoperability with the Space System.

H.       Satellite Subscriber Unit (Voice) Interface Specification:  The radio
         frequency interface, logical and physical protocols, and unit
         functionality necessary for subscriber unit (voice) interoperability
         with the Space System.  It does not include the voice encoding
         algorithm necessary for complete interoperability with the IRIDIUM
         Communications System.

I.       Space System Operations Plan:  Documentation developed under the Space
         System Contract that details the functional operation of the Space
         System.  It also

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IRIDIUM Operations and Maintenance Contract


         describes the functional operation of the entire IRIDIUM
         Communications System.
 
J.       Space System:  The term refers to the integrated combination of the
         Space Segment and System Control Segment.

K.       Space Vehicles:  The terms "space vehicle", "satellite", or
         "spacecraft" all have the same meaning throughout this contract and
         refer to the individual or multiple satellites of the Constellation.

L.       Spare Space Vehicle: A space vehicle built by Contractor to
         substantially the same performance specifications as those Space
         Vehicles built under the Space System Contract. Such Spare Space
         Vehicles are intended to be used by Contractor to replace space
         vehicles of the Constellation in accordance with its obligations under
         this contract. Contractor may store such Spare Space Vehicles on the
         ground or may launch one or more of them into an orbit below the orbit
         of the Constellation (i.e. a storage orbit) for later insertion into
         the Constellation.

M.       Subscriber Unit Segment: The Subscriber Unit Segment refers
         collectively to the individual equipment units to be used by
         subscribers and capable of initiating and receiving communications
         through the IRIDIUM Communications System. These may include for
         example hand-held portable units, aircraft units, marine units,
         portable office units, and pay phone units. As used herein, this term
         also includes paging units.

N.       System Control Segment (SCS): This term refers to the various
         ground-based sites, equipment, and facilities to manage and control
         the individual space vehicles of the Constellation, and the
         communication links of the IRIDIUM Communications System.  The System
         Control Segment is composed of a Master Control Facility, a Backup
         Control Facility, and associated Telemetry, Tracking and Command
         Facilities (TTAC's).

O.       ODN: A communications link, separate from the Space System and the
         Constellation, which is solely between and among the MCF and the
         Gateway Equipment, and which is sufficient for the transmission of
         network management data between the MCF and the Gateway Equipment and
         message delivery requests from the MOC to the MTC.  Backup link
         capabilities will be provided to the backup location(s) for the
         Network Management and MTC functions.  The ODN shall not include
         intra-SCS communications, nor the transmission of IRIDIUM subscriber
         data and fax transmissions.  The ODN under this Contract is the same
         communications link described under the same term in the Terrestrial
         Network Development Contract between Contractor and Owner.

P.       Gateway Equipment: The hardware and software for the IRIDIUM Gateway
         necessary to perform the functions specified in Section 3.1 of Exhibit
         A of the Terrestrial Network Development Contract.



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IRIDIUM Operations and Maintenance Contract


Q.       Initial GEPAs:  GEPAs for the installation of Gateway Equipment for
         the following IRIDIUM Investors, provided the installation of such
         Gateway Equipment is scheduled to occur prior to the Commercial
         Activation Date:

         1.       Iridium U.S., L.P.

         2.       Iridium SudAmerica

         3.       Nippon Iridium Corp.

         4.       United Communication Industry Public Company Limited
                  [Thai Satellite Telecommunications Co., Ltd.]

         5.       Pacific Communications Co., Ltd. - #1 [Taiwan]

         6.       Pacific Communications Co., Ltd. - #2 [Indonesia]

         7.       Iridium Services Deutschland and STET

         8.       Khrunichev State Research and Production Space Center

         9.       Iridium China (Hong Kong), Ltd.

         10.      Iridium India Telecom, Ltd.

         11.      Korea Mobile Telecommunications Corp.

R.       GEPA: A Gateway Equipment Purchase Agreement between Motorola and a
         gateway equipment purchaser.

                        ARTICLE 2.  DESCRIPTION OF WORK.

A.       Contractor shall provide the necessary labor to operate the System
         Control Segment facilities as specified by the Space System Operations
         Plan to control the space vehicles of the Constellation and the
         day-to-day Space System management for the entire IRIDIUM
         Communications System. Such Space System management functions include
         the monitoring of the Space System interface of the Space System with
         the Gateways, Subscriber Units, Paging Units and Mobile Exchange Units
         (MXUs).



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IRIDIUM Operations and Maintenance Contract


B.       Contractor shall exert its best efforts to monitor, upgrade and
         replace, the hardware and software of the Space System  (including the
         individual space vehicles) as necessary to maintain it at a quarterly
         Average Actual Service Provided (AASP) coverage factor and capacity
         factor of no less than 98.0%.  The AASP shall be calculated pursuant
         to Exhibit A hereto.  However, if the Space System Contract is
         completed and accepted by Owner at an AASP coverage or capacity factor
         of less than 98.0%, the most recent AASP coverage factor and capacity
         factor computed by Contractor preceding such completion and acceptance
         shall apply to this contract for the first complete quarterly period
         (and any initial partial quarterly period).  This activity shall
         additionally include the routine updating of the Space System
         Operations Plan as specified by Exhibit A hereto.

C.       Space vehicles lost or damaged by the acts of third parties during the
         five (5) year period of this contract shall be replaced by Contractor
         in accordance with Paragraph D of ARTICLE 4, CONTRACTORS COMPENSATION,
         of this Contract.

D.       (1) ODN Connectivity:

         Motorola shall manage and provide for the Operations and Maintenance
         of the Operations Data Network (ODN), a frame relay network separate
         from the Space System and the Constellation, which links the Gateways
         and the MCF, and provides backup links to the BCF, or to other backup
         sites at which the Network Management Function and the redundant MTC
         may be located. The ODN shall include links and capacity as designated
         by Iridium LLC for IBSS requirements, including connectivity of
         remotely located GBS installations. Availability of the ODN shall be
         consistent with the requirements for reliable delivery of the traffic
         carried, and Motorola and Iridium shall periodically review ODN
         performance data and make adjustments, if required, as mutually
         agreed.

         (2) ODN Capacity, Traffic Allocation and Cost Allocation

         Initial Capacity:

         Initially, Motorola shall provide a 64 KBPS link between the frame
         relay network and each gateway and a 256KBPS link between the frame
         relay network and the MCF. Sizing of the link to the BCF, or to other
         backup sites at which the Network Management Function and the
         redundant MTC may be located shall be sufficient to accommodate the
         equivalent traffic as would be carried by the link to the MCF. In
         addition, Motorola shall provide links to remotely located GBS sites,
         as designated by Iridium LLC. Such remote site designations and the
         initial capacity of each link shall be communicated to Motorola by
         Iridium LLC by a mutually agreeable date consistent with commercial
         and operational needs.



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IRIDIUM Operations and Maintenance Contract


         Anticipated Traffic:

         Traffic (data) to be transported by the ODN includes:

         - Motorola responsible network management data between the MCF and the
         Gateways and message delivery requests from the MOC to the MTC.

         - Iridium LLC responsible Call Detail Record traffic among GBS
         (whether colocated with the gateway or remotely located), Gateway and
         IBS (whether colocated with MCF or remotely located).

         Network management and performance data will be shared between
         Motorola and Iridium LLC in order to jointly plan network capacity
         allocations and adjustments.

         Cost Allocation:

         Motorola shall procure and manage the configuration, operation and
         maintenance of the entire ODN. Iridium LLC will reimburse Motorola for
         the following costs:

         - Non-recurring installation charges and recurring operating costs for
         links with GBS

         installations remote from the Gateways and IBS installations remote
         from the MCF.

         - Non-recurring installation charges and recurring operating costs for
         the IBSS traffic and associated links beyond the cost of the initially
         installed capacity as described above.

Each party has first rights to capacity it acquires for its respective traffic.
To the extent spare link capacity exists, Motorola and Iridium agree to share
such spare capacity in order to achieve more efficient use of installed
capacity and to minimize unnecessary expansions.

                       ARTICLE 3.  PERFORMANCE SCHEDULE.

Contractor shall immediately commence all appropriate preparations in order for
it to be responsible for the performance of all of the work described in
ARTICLE 2, DESCRIPTION OF WORK, immediately upon completion of the final
milestone of the Space System Contract. Such effort shall continue thereafter
for a period of five (5) years after the completion of the final milestone of
the Space System Contract. Both Owner and Contractor recognize the Contractor
may need to hire and train personnel, order materials from suppliers, produce
Spare Space Vehicles, and, in the event Contractor utilizes an on-orbit sparing
approach, to launch such Spare Space Vehicles, all prior to completion of the
Space System Contract.



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IRIDIUM Operations and Maintenance Contract


Contractor hereby grants to Owner the Option to extend this Contract for eight
calendar quarters beyond the five-year period of this Contract. Such Option
must be unconditionally exercised by Owner by delivering a written notice to
Contractor no later than the last day of the 20th month after the start of the
five year period of this Contract. In the event Owner exercises this Option,
during such additional eight calendar quarters, Owner will pay Contractor the
applicable quarterly payments determined from the table in paragraph A of
Article 4, "CONTRACTOR'S COMPENSATION."

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IRIDIUM Operations and Maintenance Contract


                     ARTICLE 4. CONTRACTOR'S COMPENSATION.

A.       During each of the twenty (20) calendar quarters of the five (5) years
         of this Contract, Owner shall pay Contractor quarterly payments as
         determined from the table below.


<TABLE>
<CAPTION>
                                                PAYMENT (U.S.)
                      Year                      Per Calendar Quarter*
                      ----                      --------------------
                      <S>                       <C>
                      1998                      $129,360,000
                      1999                      $134,360,000
                      2000                      $139,360,000
                      2001                      $145,360,000
                      2002                      $151,360,000
                      2003                      $157,748,000
                      2004                      $164,762,000
                      2005                      $171,777,000
                      2006                      $178,794,000
</TABLE> 

*Although the parties anticipate that the five year period of this Contract
will commence at the beginning of the fourth quarter of 1998 the actual date
cannot be determined at this time, but will be the day of the acceptance of the
final milestone of the Space System under the Space System Contract. The
quarterly periods will be January through March, April through June, July
through September, and, October through December. The quarterly payment of the
first period shall be prorated against the applicable quarterly period and be
based upon the actual number of days remaining in the quarter from and
including the day of final acceptance of the Space System under the Space
System Contract compared to the total number of days in the quarter. The
quarterly payment for the final period of the five year duration of this
contract shall be prorated based upon the actual number of days covered in the
final quarter up to and including the last day of the fifth year compared to
the total number of days in the quarter. Notwithstanding the foregoing, in the
event the completion of the Space System Contract and, therefore, the
commencement of the five year period of this Contract is delayed for more than
six (6) months for any reason other than causes within the reasonable control
of Contractor, the quarterly payments specified in Paragraph A above shall be
adjusted to account for any additional costs incurred by Contractor.

Nineteen (19) months after the commencement of this Contract, Contractor will
evaluate its relative risks and cost experience on the Contract to date and
will consider as appropriate a possible downward only price adjustment to the
quarterly prices stated herein. Any such price adjustment will be based upon
Contractor's sole and absolute discrition.


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IRIDIUM Operations and Maintenance Contract


B.       Upon termination of this Contract prior to its expiration, as a result
         of the termination of the Space System Contract prior to completion of
         its final milestone for the convenience of Owner, Owner shall
         immediately pay Contractor:

         1.       the sum of $46,000,000 (U.S.) for each Spare Space Vehicle
                  then located in a low-earth storage orbit; and

         2.       the sum of $31,000,000 (U.S.) for each Spare Space Vehicle
                  not yet launched; and,

         3.       a portion of the sum stated in B.2. above for each partially
                  completed Spare Space Vehicle whereby such portion shall be
                  equal to the percentage of completion of each space vehicle
                  multiplied times the sum listed in Paragraph B.2. above (for
                  example if a space vehicle is 75% complete, Owner shall pay
                  Contractor 75% of $31,000,000 for that partially completed
                  space vehicle).

         Upon such termination or expiration of this contract or Space System
         Contract, and payment by Owner to Contractor of all of the sums
         specified above, (items 1, 2, and 3), title and risk of loss to each
         such spare space vehicle not yet launched and the materials of each
         partially completed spare space vehicle (items 2 and 3 above) shall
         pass to Owner. Title and risk of loss to each spare space vehicle
         already in a low-earth storage orbit passes to Owner as provided by
         ARTICLE 6, TITLE TRANSFER.

C.       Upon expiration of the five (5) year period of this Contract, Owner
         shall pay Contractor the amounts specified in Paragraphs B1, B2 and B3
         above; provided however that if Owner gives Contractor written notice
         on or before the first day of the last full year of this Contract of
         Owner's intent to not renew this Contract, Owner shall only pay
         Contractor the amounts for item B1 above upon expiration of the five
         (5) year duration of this Contract.

D.       In the event one or more space vehicles of the Constellation, or, any
         space vehicle in a low earth storage orbit are damaged by the acts of
         third parties (including but not limited to the degradation or
         complete loss of any space vehicle due to contact with space debris of
         any size or character) and, upon request by Owner, Contractor agrees
         to promptly replace such damaged space vehicles.  In addition to the
         quarterly payments, Owner agrees to pay Contractor the sum of
         $46,000,000 (U.S.) upon the delivery by Contractor of a replacement
         space vehicle in the orbital position in which such damaged or lost
         space vehicle had been located.  Furthermore, any such damaged or lost
         space vehicles shall be considered fully functional for purposes of
         the computation of the Average Actual Service Provided percentages in
         Exhibit A.  Upon arrival of such replacement space vehicle in the
         designated Constellation orbital position, such replacement space
         vehicle will commence to be evaluated for purposes of the computation
         of the Average Actual Service Provided percentages in Exhibit A.

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IRIDIUM Operations and Maintenance Contract


         The parties anticipate having evidence available when a space vehicle
         is impacted by a large object in space and is totally destroyed as a
         result. However, the parties also recognize that it may be extremely
         difficult to determine the actual cause of the partial or complete
         degradation or inoperability of a space vehicle in the event it is
         impacted by small objects in space. Therefore, the parties agree that,
         in the event the evidence available to the parties suggests to
         reasonable and prudent experts knowledgeable in the field of
         spacecraft orbital operations and/or space debris that a space object
         (i.e., space debris) may have impacted a space vehicle and caused it
         to become partially or completely inoperative, such situations shall
         be deemed to be a situation whereby such spacecraft degradation was in
         fact caused by a third party for purposes of this Article; provided
         however that in such situations, Owner shall only be obligated to pay
         Contractor $23,000,000 (U.S.) upon the delivery by Contractor of a
         replacement space vehicle in the orbital position in which such
         damaged or lost space vehicle had been located.

                              ARTICLE 5. PAYMENT.

A.       The quarterly payments referred to in ARTICLE 4, CONTRACTOR'S
         COMPENSATION, shall be paid by Owner to Contractor on or before the
         first day of each calendar quarter. Payment to Contractor shall be
         made by cable/wire transfer to a banking institution as Contractor
         designates or by such other means as Contractor may designate from
         time to time.

                           ARTICLE 6. TITLE TRANSFER.

Unless otherwise stated herein, the following shall apply:

A.       Title and risk of loss or damage to each individual Spare Space
         Vehicle of the Constellation shall pass to Owner upon the earlier of
         the arrival of each such Spare Space Vehicle in a low-earth storage
         orbit, or, upon the date on which Contractor demonstrates to Owner the
         arrival of each space vehicle at its designated orbital location in
         the Constellation.  Except as provided by Paragraph D of ARTICLE 4,
         CONTRACTOR'S COMPENSATION and other specific provisions of this
         Contract, this transfer of title and risk of loss shall not affect
         Contractor's best effort obligation to maintain the quarterly Average
         Actual Service Provided percentages at a minimum 98.0% by replacing
         such Spare Space Vehicles as appropriate without any price adjustment.

B.       Title and risk of loss to the updates to the Space System Operations
         Plan, replacements or repairs to hardware and revisions to items of
         software in the System Control Segment shall pass to Owner upon the
         earlier of either the delivery of such items from Contractor to Owner
         at Contractor's Chandler, Arizona facility, or their incorporation and
         use in the books, records or facilities of Owner's System Control
         Segment. Repairs or replacements of hardware, software or other
         components of the System Control Segment due to damages caused by
         events which constitute excusable delays under ARTICLE 8 are not

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IRIDIUM Operations and Maintenance Contract


         included in the quarterly payments specified in ARTICLE 4. In addition
         to the remedies provided in ARTICLE 8, Owner agrees to pay Contractor
         for such repair and replacement work based upon terms and conditions
         mutually acceptable to both parties.

                              ARTICLE 7. CHANGES.

Changes to this Contract may be made only by mutual agreement of both parties
hereto. Such changes shall be evidenced by a written agreement executed by
authorized representatives of both parties. No change shall be binding on
either party unless and until such written document is fully executed by both
parties.

                          ARTICLE 8. EXCUSABLE DELAYS.

A.       Without limiting any other provision specifying what constitutes an
         excusable delay under this Contract, any event which causes a failure
         or delay to perform hereunder, and in every case is beyond the
         reasonable control and without the fault or negligence of Contractor
         and its subcontractors hereunder shall constitute an excusable delay,
         if notice thereof is given to Owner within thirty (30) days after such
         event shall have occurred.  Such excusable delay events include but
         are not limited to acts of God or of the public enemy; acts of
         governments in their sovereign or contractual capacity, including
         government priorities, allocations, regulations or orders affecting
         materials, facilities, or completed spacecraft; fires; floods;
         snowstorms; earthquakes; epidemics; quarantine restrictions; strikes;
         labor difficulties; wars; and freight embargoes.  Delays in launches
         of spacecraft caused by the actions or inactions of Contractor's
         launch service subcontractors directly pursuant to their subcontracts
         with Contractor shall not constitute excusable delays hereunder.  All
         other delays in launches of spacecraft arising for whatever reason not
         caused by Contractor shall constitute excusable delays hereunder.
         Such excusable delays include, but, are not limited to delays in the
         launch(es) of the Contractor's spacecraft due to delays of any other
         launch(es) (i.e. not for this contract) preceding any of Contractor's
         scheduled launch(es) whether or not caused by the actions or inactions
         of Contractor's launch service subcontractors relating to such
         preceding launches.

B.       In the event of any such excusable delay, the performance schedule
         shall be extended equitably and the quarterly payments shall be
         adjusted to account for any additional costs incurred by Contractor as
         a result of such delay.  Contractor shall exert its best efforts to
         mitigate such additional costs or schedule impact to the extent
         reasonable.  In the event of any such excusable delay Contractor shall
         be relieved of its obligation under ARTICLE 2 to exert its best
         efforts to maintain the Space System at a minimum quarterly Average
         Actual Service Provide coverage and capacity percentages of 98%.
         During such excusable delays, Contractor shall continue to maintain
         the AASP at the best reasonable level it can and shall be paid the
         full quarterly payment in addition to any additional costs it incurs
         as a result of such delay.



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IRIDIUM Operations and Maintenance Contract


                           ARTICLE 9. OWNER'S ACCESS.

For the purpose of observing the status and quality of Contractor's performance
of work, Contractor shall afford a limited number of Owner's employees, or,
designees as approved by Contractor, subject to Article 19, EXPORT REGULATIONS,
access to contract activities at the Contractor's and its first-tier
subcontractor's facilities on a non-interference basis. Contractor's approval
of designees requested by Owner shall not be unreasonably withheld; provided,
however, that such approval may be withheld if Contractor or its first-tier
subcontractor(s) have reasonable concerns as to the protection of their
proprietary information or potential injury to their competitive market
position(s).

                              ARTICLE 10. REPORTS.

Contractor shall prepare and submit to Owner the following reports in the
frequency specified during the five (5) year period of performance of this
Contract:

         1.       Quarterly reports containing Contractor's analysis of data
                  supporting its certification of its computation of the
                  Average Actual Service Provided percentages for the
                  immediately preceding quarterly period. Such reports shall be
                  submitted no later than the fifteenth day following the end
                  of each such quarterly period.

         2.       Daily summaries of space system operations activities
                  including data to be utilized in the computation of the
                  quarterly Average Actual Service Provided percentages.

                   ARTICLE 11.  INTELLECTUAL PROPERTY RIGHTS.

A.       Except for computer programs and related documentation which are
         covered by Paragraph C below, unless this Contract is terminated
         pursuant to ARTICLE 21, DEFAULT BY OWNER, Owner shall have an
         unlimited right to use, duplicate, and disclose the information
         contained in the updates to the Space System Operations Plan furnished
         pursuant to ARTICLE 2, DESCRIPTION OF WORK, of this Contract; and the
         reports delivered under ARTICLE 10 above, however, if any written
         material furnished as part of said documentation is copyrighted, Owner
         shall have an unlimited right to make copies of such copyrighted
         material and to use such copies for any Owner purpose without payment
         of additional compensation to Contractor only to the extent that
         Contractor has the authority to grant such right.  In the event
         Contractor does not have such right, Contractor will use its best
         reasonable efforts to obtain such rights for Owner.  In the event that
         the obtaining of such rights involve the payment of a fee, Owner shall
         reimburse Contractor for said fee.

B.       Except for the data listed in Paragraph A above, all data, including
         without limitation, manufacturing processes technology, and any other
         information relating to terrestrial cellular networks or components,
         that are or may be

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IRIDIUM Operations and Maintenance Contract


         delivered or disclosed by Contractor to Owner shall be subject to
         ARTICLE 26, DISCLOSURE AND USE OF INFORMATION BY THE PARTIES and Owner
         acquires no rights, title or interest in such intellectual property or
         other intellectual property associated with the design of the Space
         System except as may be negotiated in other license agreements between
         Contractor and Owner pursuant to reasonable terms and conditions
         mutually acceptable to Contractor and Owner.

C.       To the extent computer software and documentation delivered under the
         Contract is proprietary to either Contractor or its licensor, such
         items shall be provided as proprietary information under ARTICLE 27,
         DISCLOSURE AND USE OF INFORMATION BY THE PARTIES. Notwithstanding any
         other provisions of this Contract, the ownership and title to
         copyrights in computer programs and related documentation that may be
         delivered to Owner by Contractor in accordance with the Contract shall
         remain in Contractor or Contractor's licensor.

         1.       To the extent that Contractor has the right to do so,
                  Contractor shall grant to Owner, with respect to software and
                  related documentation delivered in written or magnetic or
                  optical form under the Contract as part of the System Control
                  Segment facilities, a paid-up, non-exclusive,
                  non-transferable license with respect to such software and
                  documentation, to:

                  a.       use or have used on Owner's behalf solely  for the
                           operation and maintenance of Owner's IRIDIUM Space
                           System and direct replacements thereto whether
                           manufactured by Contractor or not; and

                  b.       make one or more back-up copies for retention in a
                           secure area in case a working copy is destroyed or
                           damaged, the number of back-up copies to be
                           consistent with generally accepted and prudent data
                           processing archive procedures not to exceed six (6)
                           such copies.

         2.       Owner has no right to copy or have copied or modify software
                  that is (a) not supplied in written form or on optical or
                  magnetic media, or (b) not supplied as a part of the System
                  Control Segment equipment, or (c) embedded as firmware in any
                  equipment delivered by Contractor.

         3.       Owner's license set forth in paragraph C.1.a shall become
                  effective upon completion of the Operations and Maintenance
                  (O&M) Contract by Contractor.  Owner's license under
                  Paragraph C.1.b. shall become effective upon completion of
                  the Space System Contract.



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                         ARTICLE 12. PATENT INDEMNITY.

A.       Subject to the limitations contained or referred to herein, Contractor
         will defend at its own expense, any claim, suit or proceeding brought
         against Owner on account of the Space System or any part thereof
         supplied by Contractor to Owner under this Contract,  FOR INFRINGEMENT
         OF ANY VALID AND ENFORCEABLE PATENT IN ANY COUNTRY OF THE WORLD WHERE
         AN IRIDIUM SERVICE PROVIDER HAS BEEN AUTHORIZED TO PROVIDE SERVICES by
         an Authorized Gateway Operator, and, to the extent required, licensed
         by the government of such  country to provide IRIDIUM services.  In
         responding to such claim, suit or proceeding Contractor shall have the
         option of settling or resolving such claim, suit, or proceeding by any
         one or more of the following:

         1.       procuring for Owner the right under such patent to use,
                  lease, or sell, as appropriate, the Space System or
                  infringing part thereof; or,

         2.       replacing the Space System or infringing part thereof; or,

         3.       modifying the Space System or part thereof so as not to
                  infringe; or,

         4.       paying any settlement or any final judgment entered by a
                  court of competent jurisdiction against Owner on such
                  infringement defended by Contractor.

B.       Owner agrees that Contractor shall be relieved of the foregoing
         obligations unless Owner notifies Contractor promptly in writing of
         any such claim, suit or proceeding, and at Contractor's expense,
         cooperates with and gives Contractor complete information and
         assistance to mitigate, settle and/or defend any such claim, suit or
         proceeding.  In the event that the actual liability of Contractor as a
         consequence of a claim, suit or proceeding or a combination of claims,
         suits or proceedings in a particular country exceeds ten percent (10%)
         of the actual income derived by Owner from operation of the IRIDIUM
         Communication System in such country, then Owner shall cooperate with
         Contractor to mitigate Contractor's liability, including either
         terminating service in such country or releasing Contractor from any
         obligation for liability for patent infringement in such country in
         excess of the aforesaid percentage of Owner's income in such country.

C.       Contractor shall have no liability for any infringement arising from:

         1.       the combination of the Space System or any part thereof with
                  any other product or service not furnished by Contractor, or

         2.       the modification of the Space System or any part thereof
                  unless such modification was made by Contractor; or

         3.       a patent of a country not included in Section A of this
                  Article 12.



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D.       Subject to all the provisions of this Article 12, PATENT INDEMNITY,
         Contractor's entire liability hereunder, including liability for
         attorneys fees, costs, adverse judgments and other compliance with the
         provisions hereof, shall be limited to the amount Owner paid
         Contractor for the particular items found to infringe. Furthermore,
         Contractor's entire liability under this Article 12 shall be subject
         to the overall limitation of liability under Article 25, LIMITATION OF
         LIABILITY.

E.       Contractor shall not be liable for any costs or expense incurred
         pursuant to this Article without Contractor's written authorizations.
         CONTRACTOR SHALL IN NO EVENT BE LIABLE FOR LOSS OF USE OR FOR
         INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, WHETHER IN
         CONTRACT OR IN TORT OR UNDER ANY OTHER CAUSE OF ACTION. THE FOREGOING
         STATES THE ENTIRE WARRANTY BY CONTRACTOR AND THE EXCLUSIVE REMEDY OF
         OWNER, WITH RESPECT TO ANY ALLEGED PATENT INFRINGEMENT BY THE SPACE
         SYSTEM OR ANY PART THEREOF OR ANY OTHER PRODUCT DELIVERED BY
         CONTRACTOR TO OWNER UNDER THIS CONTRACT.

F.       Owner shall indemnify, defend and hold Contractor harmless against any
         expense, judgment, or loss for infringement of any patents, copyrights
         or trademarks which results from Contractor's compliance with Owner's
         designs, specifications, or instructions.

G.       Except as specifically provided by ARTICLE 11, INTELLECTUAL PROPERTY
         RIGHTS, and any other written agreements between the parties, no sale,
         or lease hereunder shall convey any license by implication, estoppel,
         or otherwise to Owner, under any proprietary rights, copyrights, or
         patent rights of Contractor.

                             ARTICLE 13. WARRANTY.

The provisions of this Article 13 are not intended and shall not be construed
to abate, limit or otherwise mitigate the obligations of Contractor expressly
stated elsewhere in this contract including but not limited to its obligations
as set forth in ARTICLE 2, DESCRIPTION OF WORK.

CONTRACTOR DOES NOT MAKE ANY WARRANTY WITH RESPECT TO THE SERVICES, MATERIALS
OR EQUIPMENT INCLUDING BUT NOT LIMITED TO THE SPARE SPACE VEHICLES SUPPLIED
UNDER THIS CONTRACT, WHETHER STATUTORY, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
ALL OF WHICH ARE EXPRESSLY EXCLUDED. CONTRACTOR SHALL HAVE NO LIABILITY,
WHETHER IN CONTRACT OR TORT, FOR SPECIAL, INCIDENTAL, INDIRECT, OR
CONSEQUENTIAL DAMAGES, OR FOR OWNER'S COST OF EFFECTING COVER, OR FOR FAILURE
OR NONPERFORMANCE OF PROPERTY OR FOR LOST PROFIT OR REVENUE.



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IRIDIUM Operations and Maintenance Contract


                               ARTICLE 14. TAXES.

A.       The quarterly payments of this Contract referred to in ARTICLE 4,
         CONTRACTOR'S COMPENSATION, includes all transportation and related
         charges and all applicable taxes, duties and similar liabilities
         whatsoever for delivery of all items to a destination in the
         continental United States, except any tax on the sale to Owner of any
         item delivered hereunder. Owner will reimburse Contractor for any such
         sales, use tax or duty drawback claim Contractor is required by law to
         pay.

B.       If requested by the other party, the Contractor and Owner will
         cooperate with each other in contesting and/or protesting those taxes
         which either party reasonably deems inappropriate. In return for such
         cooperation, the Contractor and Owner agree to indemnify each other
         against and hold each other harmless from any such tax that the other
         party is responsible to pay under Paragraph A above, and from any
         costs, expenses, penalties or fees (including reasonable attorneys
         fees) which either party incurs in cooperating with the other.

                        ARTICLE 15 PERMITS AND LICENSES.

A.       Contractor or one of its wholly-owned subsidiaries shall apply for and
         use its reasonable best efforts to obtain all permits, licenses and
         approvals required by the United States Federal Communications
         Commission (FCC) or by any applicable U.S. law or regulation, as well
         as all necessary orbital locations and radio frequency spectrum, to
         construct, launch and operate the Space Segment and to construct and
         operate the System Control Segment.  Specifically, Contractor or one
         of its wholly-owned subsidiaries shall apply to and use its reasonable
         best efforts to obtain from the FCC a construction permit(s) to build
         the Space Segment and at least one of the System Control Segment
         facilities within the United States.  In the event such permit to
         construct all of the spacecraft and System Control Segment facilities
         is not issued by the FCC or other authorized Government entity
         acceptable to Owner (whether U.S. or foreign) to Contractor or its
         wholly-owned subsidiary on or before December 1, 1994, such situation
         shall be treated as an excusable delay under ARTICLE 8, EXCUSABLE
         DELAYS, and the price only of this Contract shall be adjusted
         accordingly for costs incurred by Contractor after December 1, 1994 as
         a result of failure to obtain such permit.  In the event such permit
         to construct all of the spacecraft and System Control Segment
         Facilities is not issued by the FCC or other authorized Government
         entity acceptable to Owner (whether US or foreign) to Contractor or
         its wholly- owned subsidiary on or before January 1, 1995, such
         situation shall be treated as an excusable delay under ARTICLE 8,
         EXCUSABLE DELAYS, and the price and schedule of this Contract shall be
         adjusted accordingly for costs incurred by Contractor after December
         1, 1994 and for schedule delays incurred after January 1, 1995 as a
         result of failure to obtain such permit.  Contractor or one of its
         wholly-owned subsidiaries also shall apply for and use its reasonable
         best efforts to obtain from the FCC a license(s) to launch and operate
         the Space

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IRIDIUM Operations and Maintenance Contract


         System within the United States and between the United States and
         international points. If such license to launch and operate is not
         issued to Contractor or its wholly-owned subsidiary by February 1,
         1996 such situation shall be treated as an excusable delay under
         ARTICLE 8, EXCUSABLE DELAYS, and the quarterly payments and schedule
         of this Contract shall be adjusted accordingly. Contractor shall exert
         its best reasonable efforts to mitigate the impact of any such
         excusable delays by attempting to obtain a waiver, alternate license
         (i.e., an experimental license) or undertaking other actions as
         determined appropriate in Contractor's discretion.

B.       Contractor shall use its reasonable best efforts to coordinate within
         the United States and on a worldwide basis the effective use by the
         Space System of the necessary frequency spectrum and orbital
         locations.

C.       Contractor shall use its reasonable best efforts to defend and
         maintain all of the aforementioned approvals, permits, and licenses
         for the Space System and System Control Segment in accordance with
         their respective terms and conditions, and to operate the Space System
         and System Control Segment in accordance with all applicable laws and
         government regulations.

D.       Contractor shall pay for its costs of applying for, obtaining and
         renewing the aforementioned approvals, licenses and permits. Owner
         agrees to reimburse Contractor for all of its other expenses
         associated with the aforementioned approvals, licenses, permits and
         allocations, including but not limited to Contractor's costs of
         defending against challenges by third parties, and for coordinating
         within the United States and on a worldwide basis the effective use by
         the Space System of the necessary frequency spectrum.

E.       Contractor agrees to keep Owner fully informed on a timely basis of
         material events relating to the operational and performance status of
         the Space System, and any communications relating to the
         aforementioned approvals, licenses, permits and allocations.
         Specifically, Contractor shall use its reasonable best efforts to
         furnish to Owner the following promptly after their receipt by or
         issuance from Contractor:

         All communications to or from any regulatory authority, national,
         foreign or international, which relate to or affect the Space System
         or any approvals, licenses, permits or allocations associated
         therewith.

F.       Owner agrees not to take any action or enter into any agreement or
         arrangement with a third party that conflicts with Contractor's rights
         and obligations under this Contract, or to act or fail to act in any
         manner which would interfere with Contractor's aforementioned
         responsibilities.

G.       Notwithstanding any other provision in this Contract, Contractor shall
         at all times retain full responsibility for, and all control of the
         Space System and all components thereof, including but not limited to
         the System Control Segment and any other facilities or stations
         licensed by the FCC.  Furthermore, nothing

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IRIDIUM Operations and Maintenance Contract


         contained herein shall be interpreted as requiring Contractor to apply
         for or obtain the blanket mobile licenses to operate subscriber units
         nor the authorizations necessary to operate gateways in the United
         States or any other country. Although Contractor or one of its
         subsidiaries may apply to become a gateway operator or service
         provider for the United States, such action and the obtaining of
         necessary FCC licenses to provide such service, shall be accommodated
         via separate agreements with Owner as appropriate.

H.       Contractor agrees that, upon request of Owner, if the written opinion
         of Contractor's legal counsel concludes that Owner is lawfully
         qualified to hold the approvals, permits and licenses to construct,
         launch and operate the Space System obtained by Contractor pursuant to
         Paragraph A above, Contractor will use its best reasonable efforts to
         promptly apply for and obtain appropriate authorization from the FCC
         to transfer such approvals, permits and licenses, including any
         pending applications therefore, to Owner at no cost to Owner except
         for those costs that may result from FCC implementation of an auction
         approach to issuing such permits, licenses, or approvals.  Neither the
         application to transfer nor the issuance of any license to Owner
         pursuant thereto shall affect the rights and obligations of the
         parties hereto except the obligations of Contractor as provided by
         Paragraphs A, B, and C above, which shall also completely transfer to
         Owner upon transfer of such approvals, permits and licenses to Owner.
         In the event the FCC adopts an auction approach to issuing any of the
         permits, licenses or approvals contemplated by this Article,
         Contractor and Owner agree to negotiate in good faith a mutually
         acceptable arrangement with respect to such auctions.

                     ARTICLE 16. CROSS WAIVER OF LIABILITY.

A.       In the event the U.S. Commercial Space Launch Act of 1984, as amended,
         is applicable to the launch of spacecraft, to the extent required
         thereunder and by any launch service provider licensed thereunder,
         both parties agree to make no claims against the other, the
         contractors and subcontractors of the other at any tier (including
         suppliers of any kind), the officers, directors, agents, servants, and
         employees of the other, or any of them, with respect to injury to or
         death of either party's employees involved in, or damage to either
         party's property in connection with all licensed activities relating
         to launches of space vehicles of the Constellation, except as provided
         by ARTICLE 20, INDEMNIFICATION.  Both parties further agree to cause
         all of their respective contractors and subcontractors at any tier
         (including suppliers of any kind) to make no such claims.

B.       Both parties hereby waive and shall cause their contractors and
         subcontractors at any tier (including suppliers of any kind) to waive
         any cause of action in tort against the U.S.  government, its agents,
         employees, contractors, and subcontractors to the extent required by
         the U.S. government, and agree to furnish appropriate waivers and
         releases as may be required to implement this

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IRIDIUM Operations and Maintenance Contract


         Article in connection with the use of U.S. government launch
         facilities, equipment, or required launch support services.

C.       In the event Contractor conducts any launch of space vehicles not
         subject to the U.S.  Commercial Space Launch Act both parties agree to
         accede to any waiver of claims as may be required pursuant to
         applicable law or as required by any launch service provider.
         Contractor agrees to keep Owner informed as to the status of
         negotiations with such launch service providers with respect to any
         such waiver of claims provisions that are proposed by launch service
         providers not subject to the U.S. Commercial Space Launch Act.
         Contractor further agrees to use its best reasonable efforts to
         negotiate such waiver of claims provisions so that they are not any
         broader than the waivers required by the U.S. Commercial Space Launch
         Act.

                          ARTICLE 17. INDEMNIFICATION.

A.       Owner shall indemnify and hold harmless Contractor, its directors,
         officers, agents, subsidiaries, servants, and employees from any
         liabilities, losses and damages including costs, expenses and damages
         incurred by Contractor in connection with any and all claims by third
         parties caused by or arising out of the development, operation or use
         of any part of the Space System after passage of title thereto to
         Owner in accordance with ARTICLE 6, TITLE TRANSFER, except any such
         third party liabilities, losses and damages that are caused by the
         willful misconduct of Contractor.  The foregoing indemnification shall
         only apply to the extent such liabilities, losses and damages exceed
         the amounts paid by Contractor's launch service providers, any
         governmental indemnification, and the insurance obtained by Owner as
         provided by ARTICLE 18, INSURANCE.

B.       CONTRACTOR SHALL NOT BE LIABLE TO OWNER, CUSTOMERS OF OWNERS OR THEIR
         CUSTOMERS FOR ANY DAMAGES RESULTING FROM ANY LOSS, DESTRUCTION,
         DEGRADATION OR FAILURE OF THE IRIDIUM COMMUNICATIONS SYSTEM OR ITS
         SUBSYSTEMS TO OPERATE SATISFACTORILY.  Owner agrees to enter into
         suitable agreements with its customers to effect the foregoing
         limitation of Contractor's liability and agrees to indemnify and hold
         harmless Contractor, its directors, officers, agents, subsidiaries,
         servants, contractors and employees against the unenforceability of
         any such limitation or Owner's customer's failure to secure such
         limitation of liability provisions in agreements with their customers.

C.       Each party shall indemnify the other for and hold it harmless from any
         liability, loss or damage suffered by the other party resulting from
         the failure of such party to comply with its obligations under this
         Contract to waive or to cause its contractors and subcontractors at
         any tier (including suppliers of any kind) to make no claims under
         this Contract.



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IRIDIUM Operations and Maintenance Contract


                            ARTICLE 18.  INSURANCE.

A.       Contractor shall procure and maintain during performance of this
         Contract Worker's Compensation Insurance covering all employees of
         Contractor performing any work hereunder in statutory amounts;
         provided however that Contractor may maintain a self-insurance program
         in lieu of Worker's Compensation Insurance if authorized and qualified
         to do so pursuant to statutory authority.

B.       Owner shall procure and maintain during performance of this Contract,
         at its sole cost and expense, comprehensive general liability
         insurance in an amount no less than $500,000,000 (U.S.) covering
         Owner's indemnification obligations under ARTICLE 17, INDEMNIFICATION
         on such terms and conditions and with such insurers acceptable to
         Contractor, and, which insurance shall name Contractor, its
         contractors and subcontractors as additional insureds.  Owner shall
         furnish Contractor with a waiver of its insurance carrier's rights of
         subrogation, and, with respect to the insurance obligations under this
         Article, such insurance shall also provide that the insurers shall
         give thirty (30) days notice to Contractor prior to the effective date
         of cancellation or termination of such insurance.  To the extent
         insurance is provided for Contractor's benefit by its launch service
         provider(s), in connection with any third party liability arising from
         provision of the launch services, Contractor agrees to use its best
         efforts to add Owner as an additional insured to such insurance and,
         in such event, the insurance provided herein will be secondary
         coverage to the extent such insurance from Contractor's launch service
         provider(s) and any indemnification provided by the U.S. Government,
         any other Government, and any launch service provider covers the same
         third party liability risks.

                        ARTICLE 19.  EXPORT REGULATIONS.

Neither party shall export, directly or indirectly, any information or
technical data disclosed under this Contract to any individual or country which
the U.S. government at the time of export requires an export license or other
government approval without first obtaining such license or approval. The
parties recognize that Owner may be comprised of individuals or entities for
which Owner must ensure no disclosure of technical data unless and until Owner
obtains appropriate export licenses from the U.S. Government.

                      ARTICLE 20.  DEFAULT BY CONTRACTOR.

A.       Owner may, by written notice of default sent by registered letter to
         Contractor, terminate this Contract for cause, if Contractor fails to
         exert its best efforts as required by ARTICLE 2 to maintain the
         quarterly Space System Average Actual Service Provided coverage and
         capacity factors as provided by Exhibit A at a level of at least
         98.0%, and does not cure such default within a period of one hundred
         twenty (120) days (or such longer period as Owner may authorize in
         writing) after receipt of notice from Owner specifying such failure.
         Such termination for the

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IRIDIUM Operations and Maintenance Contract


         default of Contractor shall be deemed effective on the date such
         written notice of default is received by Contractor.

B.       If this Contract is terminated as provided in this Article, Contractor
         shall:

         1.       Promptly refund to Owner the total quarterly payment paid by
                  Owner to Contractor for the quarterly period during which
                  such termination is effective; and,

         2.       Be paid the applicable quarterly payments earned for all
                  completed quarterly periods of this Contract prior to the
                  quarter in which such termination is effective; and,

         3.       Upon request by Owner and at Owner's expense, protect and
                  preserve property in the possession of Contractor in which
                  Owner has an interest; and,

         4.       Subject to ARTICLE 25, LIMITATION OF LIABILITY, pay to Owner
                  all reasonable costs to have this Contract completed by
                  another responsible contractor, to the extent such costs
                  exceed the total amount which Owner would have had to pay
                  Contractor for this Contract had Contractor completed the
                  Contract as required; provided however that Owner enters into
                  a contract with a responsible contractor to complete the
                  terminated effort within one (1) year of notification of
                  termination for default; and,

         5.       Deliver to Owner all drawings and other technical data
                  associated with the Space System developed as part of the
                  performance of the Contract along with appropriate
                  intellectual property licenses to the intellectual property
                  embodied in such drawings and other technical data as of the
                  default date, to use, make and have made such items to the
                  extent it is permitted to do so by third parties. The
                  licenses to be granted shall exclude intellectual property
                  rights associated with all manufacturing process technology,
                  ISU's, MXU's, Gateways and any terrestrial cellular networks
                  and components.

         6.       Be paid by Owner the appropriate amounts for spare spacecraft
                  in orbit as provided by Section 1 of Paragraph B of ARTICLE
                  4, CONTRACTOR'S COMPENSATION and, if Owner desires to
                  purchase any completed or partially completed spacecraft,
                  Owner will pay Contractor the amounts provided by Sections 2
                  and 3, as applicable, of Paragraph B of ARTICLE 4; provided
                  that the amounts payable by Owner to Contractor herein shall
                  be reduced by the amount, if any, by which the total payments
                  made by Owner to Contractor under Paragraph B.2 above exceed
                  the total value of the spare spacecraft launched prior to the
                  effective termination date--the total value of spare
                  spacecraft shall be computed by multiplying the total number
                  of spare spacecraft launched prior to or during the five year
                  period of this contract by $46,000,000.



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IRIDIUM Operations and Maintenance Contract


         7.       If Seller has not transferred the approvals, permits and
                  licenses as provided in Paragraph H of ARTICLE 15, PERMITS
                  AND LICENSES, the Seller will continue to operate the System
                  Control Segment Facilities, if completed, (but, not to
                  replace space vehicles in the Constellation or upgrade the
                  hardware or software of the System Control Segment) to permit
                  Buyer time to obtain a successor operator for a period not to
                  exceed thirty (30) days at no cost to Buyer. Buyer and Seller
                  may agree to extend this thirty day period at a price and on
                  such terms as are mutually acceptable to the parties.

C.       THE REMEDIES SET FORTH IN THIS ARTICLE SHALL BE SOLE RECOURSE TO WHICH
         OWNER IS ENTITLED IN THE EVENT OF CONTRACTOR'S DEFAULT (I.E. BREACH),
         AND CONTRACTOR SHALL HAVE NO LIABILITY FOR SPECIAL, INDIRECT,
         INCIDENTAL OR CONSEQUENTIAL DAMAGES OR FOR LOST PROFITS OR LOST
         REVENUES.

D.       If, after Owner's issuance of a notice of default under the provisions
         of this Article, it is determined for any reason that the Contractor
         was not in default under the provisions of this Article, or that the
         delay was excusable under the provisions of the ARTICLE 8, EXCUSABLE
         DELAYS, the rights and obligations of the parties shall be the same as
         if Owner defaulted in performance of its obligations under this
         Contract as provided by ARTICLE 21, DEFAULT BY OWNER.

                         ARTICLE 21.  DEFAULT BY OWNER.

A.       In the event Owner fails to perform any obligation which it is
         required to perform pursuant to this Contract, including without
         limitation, Owner's failure to make timely payments as required by
         this Contract, Contractor may, if such failure is not corrected by
         Owner within thirty (30) days after notice of such failure is given by
         Contractor, (five (5) days in the case of Owner's failure to make
         timely payments), stop work on this Contract and consider this
         Contract to be terminated for cause due to the default of Owner. If
         this Contract is terminated pursuant to this Article, Owner shall:

         1.       immediately pay to Contractor to the extent it had not
                  already done so, all payments for all quarterly periods
                  completed prior to the quarterly period during which such
                  default by Owner occurs; and,

         2.       immediately pay to Contractor the full payment for the
                  quarterly period during which such default by Owner occurs;
                  and,

         3.       pay to Contractor within thirty (30) days after receipt of
                  Contractor's invoice, the full amount of the anticipated and
                  reasonable profits Contractor could have earned had it been
                  permitted to complete this Contract; and,

         4.       immediately pay to Contractor the appropriate amount for
                  spare spacecrafts as specified in Sections 1, 2 and 3 of
                  Paragraph B of ARTICLE 4, CONTRACTOR'S COMPENSATION; and,

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IRIDIUM Operations and Maintenance Contract


         5.       return to Contractor all documentation and technical data
                  previously delivered to Owner by Contractor; and,

         6.       assign to Contractor of any and all licences of Owner to use
                  IRIDIUM frequency allocations in all countries worldwide to
                  the fullest extent permitted by law.

B.       THE REMEDIES SET FORTH IN THIS ARTICLE SHALL BE THE SOLE RECOURSE TO
         WHICH CONTRACTOR IS ENTITLED IN THE EVENT OF OWNER'S DEFAULT, AND,
         EXCEPT AS PROVIDED ABOVE, OWNER SHALL HAVE NO LIABILITY FOR SPECIAL,
         INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR FOR LOST PROFITS OR
         LOST REVENUES.

                       ARTICLE 22. EXTENSION TO CONTRACT.

Contractor agrees to enter into negotiations with Owner, upon Owner's request,
to extend the five (5) year period of this contract subject to mutual agreement
on all terms and conditions of such extension. Unless such negotiations
commence earlier, Contractor intends to submit a proposal for such extension to
Owner no later than the beginning of the third year of the five year period of
this contract.

              ARTICLE 23.  TERMINATION OF SPACE SYSTEM CONTRACT.

Upon termination of the Space System Contract for whatever reason, this
Operations and Maintenance Contract shall also immediately terminate thereby
releasing both parties from any further obligations hereunder except for
Owner's obligation to pay Contractor for spare space vehicles as provided in
Paragraph B of ARTICLE 4 herein.

                   ARTICLE 24.  NEXT GENERATION SPACE SYSTEM.

The parties may negotiate a separate contract for the production of the next
generation of the Space System providing for increased capability of the entire
IRIDIUM Communications System. In the event such contract results in the
launching of space vehicles to create the updated space system prior to the
expiration of this Contract, the parties may agree to modify or terminate this
Contract on such mutually acceptable terms and conditions as they may agree at
that time.

                     ARTICLE 25.  LIMITATION OF LIABILITY.

A.       IN NO EVENT SHALL CONTRACTOR BE LIABLE, WHETHER IN CONTRACT,
         TORT OR OTHERWISE, FOR SPECIAL, INCIDENTAL, INDIRECT OR
         CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION LOST PROFIT OR
         REVENUES.

B.       FURTHERMORE, IN NO EVENT AND UNDER NO CIRCUMSTANCES SHALL
         CONTRACTOR BE LIABLE TO OWNER IN AN AMOUNT IN EXCESS OF ONE HUNDRED
         MILLION DOLLARS ($100,000,000 (U.S.)) FOR ANY AND ALL COSTS, DAMAGES,
         CLAIMS OR LOSSES WHATSOEVER ARISING OUT OF

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IRIDIUM Operations and Maintenance Contract


         OR RELATED TO THIS CONTRACT OR ANY OTHER CONTRACT REFERRED TO IN
         ARTICLE 29 HEREOF OR EXECUTED BETWEEN OWNER AND CONTRACTOR IN
         CONNECTION WITH THE IRIDIUM COMMUNICATIONS SYSTEM, OR ANY PROVISION
         HEREUNDER OR THEREUNDER, WHETHER PURSUED AS A BREACH OR DEFAULT OF THE
         CONTRACT OR AS A TORT OR OTHER CAUSE OF ACTION AND WHETHER ACCRUING
         BEFORE OR AFTER COMPLETION OF ALL THE WORK REQUIRED UNDER THE
         CONTRACT.

        ARTICLE 26.  DISCLOSURE AND USE OF INFORMATION BY THE PARTIES.

A.       "Proprietary Information" is defined as information which the
         disclosing party at the time of disclosure identifies in writing as
         Proprietary Information by means of a proprietary legend, marking,
         stamp or other positive written notice identifying the information to
         be proprietary.  In order for information disclosed orally or visually
         by a party to this Contract to be Proprietary Information protected
         hereunder, the disclosing party shall identify the information as
         proprietary at the time of the disclosure and, within thirty (30) days
         after such oral or visual disclosure, reduce the subject matter of the
         disclosure to writing, properly stamped with the proprietary legend,
         marking, stamp or other positive written notice and submit it to the
         receiving party.

B.       Except as may be specifically provided otherwise in this Contract,
         Proprietary Information of Contractor disclosed hereunder to Owner may
         only be used by Owner for monitoring the progress of the performance
         of this Contract by Contractor.

C.       Except as may be specifically provided otherwise in this Contract,
         Proprietary Information of Owner disclosed hereunder to Contractor may
         only be used by Contractor in performance of the work specified in
         this Contract.

D.       It is agreed that for a period of ten (10) years following the receipt
         of Proprietary Information, the receiving party will use such
         information only for the purpose(s) provided in Paragraphs B and C
         above as applicable and shall take reasonable efforts to preserve in
         confidence such Proprietary Information and prevent disclosure thereof
         to third parties.  Each of the parties agree that it will use the same
         reasonable efforts to protect the other's Proprietary Information as
         are used to protect its own but will at least use reasonable care.
         Disclosures of such information shall be restricted to those
         individuals directly participating in the efforts provided in
         Paragraphs B and C above who have a need to know such information,
         and, who have been made aware of and consent to abide by the
         restrictions contained herein concerning the use of such information.

E.       The obligation to protect Proprietary Information, and the liability
         for unauthorized disclosure or use of Proprietary Information, shall
         not apply with respect to such information which is now available or
         becomes available to the public without breach of this Contract;
         information lawfully received without

                                                               CONFORMED 1/14/97


                                    Page 24

<PAGE>   27


IRIDIUM Operations and Maintenance Contract


         restrictions from other sources; information known to the receiving
         party prior to disclosure not subject to a separate non-disclosure
         obligation; information published or disclosed by the disclosing party
         to others, without restriction; information developed by the receiving
         party independent of and without use of the information disclosed by
         the disclosing party; or, information for which further use or
         disclosure by the recipient is authorized in writing by the disclosing
         party.

                  ARTICLE 27.  PUBLIC RELEASE OF INFORMATION.

Except as otherwise provided by ARTICLE 26, DISCLOSURE AND USE OF INFORMATION
BY THE PARTIES, during the term of this Contract, either party, its affiliates,
subcontractors, employees, agents and consultants may release items of
publicity of any kind, including, without limitation, news releases, articles,
brochures, advertisements, prepared speeches, external company reports or other
information releases, related to the work performed hereunder, including the
denial or confirmation thereof. Each party shall provide a copy of such
publicity items to the other and shall endeavor to provide such copies prior to
their actual release to the public. Notwithstanding the foregoing, however,
neither party may disclose the specific terms and conditions of this Contract
without the prior approval of the other party except such disclosures required
by law, or information required to be disclosed to any persons involved in
insuring risks hereunder. Notwithstanding the foregoing, however, neither party
may disclose the specific terms and conditions of the Contract without the
prior approval of the other party except for such disclosures required by law
or as a part of the Private Placement Memorandum issuance.

                            ARTICLE 28.  ASSIGNMENT.

Neither party shall assign or delegate this Contract or any of its rights,
duties, or obligations thereunder to any other person without the prior express
written approval of the other party except that Owner agrees that Contractor
may assign this Contract to any subsidiary or successor corporation of
Contractor. Nothing contained in this Article shall restrict Contractor from
subcontracting work or procuring parts/materials or services in the ordinary
course of performance of this Contract; nor shall it restrict Owner from
assigning any right, title or interest it may have in any items delivered by
Contractor hereunder, solely to secure financing for the IRIDIUM Communications
System.

                ARTICLE 29.  RELATIONSHIP WITH OTHER AGREEMENTS.

The following agreements executed simultaneously or after this Contract relate
to the effort described herein. The rights and responsibilities of the parties
within each of these related agreements is set forth within each such separate
and independent agreement.

A.       SPACE SYSTEM CONTRACT:  The IRIDIUM Space System Contract covers the
         design, development, and construction of the IRIDIUM Space System
         including the deployment and activation of all space vehicles of the
         Constellation, and, the

                                                               CONFORMED 1/14/97


                                    Page 25

<PAGE>   28


IRIDIUM Operations and Maintenance Contract


         construction and activation of the Master and Backup Control
         Facilities and the TTAC's of the System Control Segment. This
         Operations and Maintenance Contract is intended to cover the effort
         required to operate the System Control Segment Facilities and
         interface with the remainder of the complete IRIDIUM Communciations
         System, and, commence replenishment of space vehicles of the
         Constellation of the IRIDIUM Space System Contract. Subject to Owner's
         obligation to pay Contractor for spare spacecraft as provided by
         Sections 1, 2, and 3 of Paragraph B of ARTICLE 4, CONTRACTOR'S
         COMPENSATION., in the event the IRIDIUM Space System Contract is
         terminated for whatever reason, this Operations and Maintenance
         Contract shall also terminate. Neither this Contract nor the Space
         System Contract include the development, sale, operation or
         maintenance of the Gateways of the IRIDIUM Communications System.

B.       ENGINEERING ASSISTANCE AGREEMENT:  This contract is intended to
         provide engineering assistance and other services by Contractor to
         Owner in excess of the scope of the Space Segment Procurement Contract
         and this Operation and Maintenance Contract. Such services could
         include the system engineering design assistance in evaluating the
         utility of an enhanced design for the second or replacement Space
         System.

                             ARTICLE 30.  NOTICES.

All correspondence, including notices, reports and documentation deliverables,
to be provided to Owner or Contractor under this Contract shall be sent to
Owner or Contractor as follows:

<TABLE>
         <S>                                    <C>
         Owner:   Iridium LLC                   Contractor:  Motorola, Inc.            
                                                                                       
         Address: 1401 H Street NW,             Address:     2501 S. Price Rd.         
                  Suite 800                                  Chandler, AZ 85248        
                  Washington, D.C. 20005                                                
                                                                                        
         Attn:    Robert R. Call                Attn:        Walter R. Rhodes          
                  Director, Commercial                       Director, Contractual     
                  Relations                                  Alliances Satellite       
                                                             Communications            
                                                             M/D  G1214                
                                                                                       
         Phone:   (202) 326-5648                Phone:       (602) 732-2634            
         FAX:     (202) 842-0006                FAX:         (602) 732-2542            
</TABLE>


                                                               CONFORMED 1/14/97


                                    Page 26

<PAGE>   29


IRIDIUM Operations and Maintenance Contract


                    ARTICLE 31.  AUTHORIZED REPRESENTATIVES.

The only representatives of Owner and Contractor authorized to make changes to
this Contract and to sign contractual documents are:


         Owner:                              Contractor:

         Edward F. Staiano                   Durrell L. Hillis
         F. Thomas Tuttle                    Bary Bertiger
                                             Mark Borota


Either party may change its aforementioned representatives at any time by
providing written notice to the other party.

                             ARTICLE 32.  EXHIBITS.

The following Exhibits are attached hereto and hereby incorporated as part of
this Contract by reference as if fully set forth within this Contract:

         Exhibit A - Statement of Work

                       ARTICLE 33.  ORDER OF PRECEDENCE.

In the event of any inconsistency among or between the parts of this Contract,
such inconsistency shall be resolved by giving precedence in the order of the
parts as set forth below:

         1.       Contract Articles

         2.       Space Systems Operations Plan

         3.       Exhibit A, Statement of Work

                          ARTICLE 34.  APPLICABLE LAW.

This Contract and any dispute arising under or in connection with this
Contract, including any action in tort, shall be construed in accordance with
and governed by the laws of the State of Arizona except for its choice of laws
rules. Venue for any dispute not resolved by the parties shall be in Arizona.

Contractor and Owner will attempt to settle any claim or controversy arising
out of it through consultation and negotiation in good faith and a spirit of
mutual cooperation. If those attempts fail, then the dispute will be mediated
by a mutually-acceptable mediator to be chosen by Contractor and Owner within
forty-five (45) days after written notice by one of us demanding mediation.
Neither party may unreasonably withhold consent to the selection of a mediator,
and Contractor and Owner will share the costs of the mediation equally. By
mutual agreement, however, the parties may postpone mediation until they have
each completed some specified but limited discovery about the dispute. The
parties

                                                               CONFORMED 1/14/97


                                    Page 27

<PAGE>   30


IRIDIUM Operations and Maintenance Contract


may also agree to replace mediation with some other form of alternative dispute
resolution (ADR), such as neutral fact-finding or a minitrial.

Any dispute which is not resolved by the parties through negotiation, mediation
or other form of ADR within six (6) months of the date of the initial demand
for it by either party, may then be submitted to the courts within Arizona for
resolution. The use of any ADR procedures will not be construed under the
doctrines of laches, waiver or estoppel to affect adversely the rights of
either party. And nothing in this section will prevent either party from
resorting to judicial proceedings if (a) good faith efforts to resolve the
dispute under these procedures have been unsuccessful or (b) interim relief
from a court is necessary to prevent serious and irreparable injury to one
party or to others.

                         ARTICLE 35.  ENTIRE AGREEMENT.

This Contract constitutes the entire agreement between the parties and
supersedes all prior understandings, commitments, and representations with
respect to the subject matter. This contract may not be amended or modified,
except as provided by ARTICLE 7, CHANGES; nor may it be terminated except as
provided by articles 20 or 21; and none of its provisions may be waived, except
by a writing signed by an authorized representative of the party against which
waiver is sought to be enforced. The paragraph headings herein shall not be
considered in interpreting the text of this Contract. In the event any part of
this Contract is declared legally invalid or unenforceable by an authorized
judicial body, such part of this Contract shall be ineffective to the extent of
such invalidity or unenforceability and shall not affect the remaining
provisions of this Contract unless such declaration affects ARTICLE 17,
INDEMNIFICATION, or ARTICLE 25, LIMITATION OF LIABILITY. In such case, this
Contract shall be declared terminated as of the date of such judicial decision
and the parties shall have the following rights and responsibilities:

A.       To the extent it had not done so, Owner shall pay Contractor the total
         amount of applicable quarterly payments for all complete calendar
         quarters prior to such termination; and,

B.       To the extent it had not done so, Owner shall pay Contractor a
         percentage of the quarterly payment for the calendar quarter in which
         such termination occurs. The percentage of such payment payable by
         Owner shall equal the percentage derived by dividing the total number
         of days of such calendar quarter up to and including the termination
         day, by the total number of calendar days of the quarter; and,

C.       Subject to Owner making immediate payments of A and B above,
         Contractor shall continue to operate the System Control Segment
         Facilities (but not to replace space vehicles in the constellation or
         upgrade the hardware or software of the System Control Segment) to
         permit Owner time to obtain a successor operator for a period not to
         exceed thirty (30) days at no cost to Owner.

                          ARTICLE 36.  EFFECTIVE DATE.

The term Effective Date of this Contract (EDC), as used in this Contract shall
mean the 29th day of July, 1993.

                                                               CONFORMED 1/14/97


                                    Page 28

<PAGE>   31


IRIDIUM Operations and Maintenance Contract


IN WITNESS WHEREOF, the parties hereto have executed this Contract consisting
of this and the preceding 28 pages and the Exhibit referenced therein.


Motorola, Inc.                         Iridium LLC


By: /s/ BARRY BERTIGER                 By: /s/ JERROLD D. ADAMS
- -------------------------------------------------------------------------------

Name:   Barry Bertiger                 Name:   Jerrold D. Adams
- -------------------------------------------------------------------------------

Title:  Corporate Vice President       Title: President and Chief Operating
          and General Manager                   Officer
- -------------------------------------------------------------------------------

Date:                                  Date:
- -------------------------------------------------------------------------------



                                                               CONFORMED 1/14/97


                                    Page 29

<PAGE>   32


IRIDIUM Operations and Maintenance Contract


                                   EXHIBIT A
                               STATEMENT OF WORK


1.0      Contractor is responsible to operate or direct the operation of the
         IRIDIUM Communication System. This responsibility includes
         functionally operating the System Control Segment (SCS) facilities in
         accordance with the Space System Operations Plan by providing adequate
         qualified personnel on a 24 hour-a-day basis in the Master Control
         Facility and adequate personnel for the Backup Control Facility;
         maintaining and updating the Space System Operations Plan as changes
         are made in the network; and, resolving failures in the network by
         modifying the call routing instructions, updating/debugging software,
         replacing degraded satellites of the Constellation, and similar
         activities. The AASP measurements shall be made by Contractor using
         special test equipment provided by the Contractor. The special test
         equipment shall provide the necessary signal format and calibrated RF
         signal measurement capability.

2.0      The AASP provides two separate measures of the network performance
         provided to a hypothetical subscriber randomly located anywhere on the
         earth's surface. The AASP data and related calculations include
         separate calculations of factors related to the coverage provided to
         the subscriber by the Space System L-Band equipment as well as factors
         related to the Space System's capability to meet the capacity
         requirements of this contract. Contractor's interpretation of such
         data and measurements shall be conclusive for purposes of the
         computation of the AASP percentages under this Contract absent
         manifest error, gross negligence or fraud. The AASP percentages shall
         be computed on a quarterly basis concurrent with the quarterly periods
         specified in ARTICLE 4 of the Contract using the following formulae:

         X = (A-B)/A

         Y = (A-C)/A

         X = Coverage factor during the evaluation period.

         Y = Capacity factor during the evaluation period.

         A = The total number of seconds in the period. This will be determined
         by multiplying 60 seconds per minute times 60 minutes per hour times
         24 hours per day (86,400 seconds) times number of days in the period.

         B = a factor that is intended to determine the capability of the Space
         System to provide a L-Band link to a user within specified tolerances
         for the period of performance. B is calculated as described in
         Paragraph 2.1.

         C = a factor that is intended to determine the capability of the Space
         System to meet the specified system capacities based on the equipment
         downtimes of the individual space vehicle crosslinks, the space
         vehicle gateway/SCS links, and the space vehicle channel capacity. C
         is calculated as described in Paragraph 2.3.




                                     Page 1

<PAGE>   33


IRIDIUM Operations and Maintenance Contract

                                   EXHIBIT A
                               STATEMENT OF WORK


2.1      CALCULATION OF "B" FACTOR:

         Procedure:

         1) From telemetry, built-in-test results, or periodic monitoring
         determine the individual space vehicle antenna beams with suspected
         degraded performance and the time that the degraded performance was
         initially detected. Each antenna beam cluster shall be monitored for
         degradation a minimum of once per day.

         2) Verify and quantify the extent of degradation of each antenna beam
         identified in step 1) using a calibrated test set. The downlink
         degradation shall be measured in terms of Power Flux Density (PFD)
         while uplink is measured in terms of Bit Error Rate (BER) for the
         nominal subscriber link per Table 2-1. The BER calculation shall be
         made on a frame by frame basis and averaged over an antenna beam
         pattern and power level. BER and PFD data will be recorded by
         satellite and individual beam pattern to enable AASP calculations. The
         percent degradation used in the AASP calculation for each antenna beam
         shall be as shown in Table 2.1.

         TABLE 2.1
         DEGRADATION LEVELS FOR USE IN CALCULATING "B"

         DOWNLINK DEGRADATION

<TABLE>
<CAPTION>
         ------------------------------------------------------------------------------------------------
                                                     PFD                                Percent
          Performance Level                     dbW/sq meter                          Degradation
         ------------------------------------------------------------------------------------------------
                  <S>                                 <C>                                  <C>



                  *                                   *                                    *




         ------------------------------------------------------------------------------------------------
</TABLE>
         Test Conditions:


                                       *


- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 2

<PAGE>   34


IRIDIUM Operations and Maintenance Contract

                                   EXHIBIT A
                               STATEMENT OF WORK


         Uplink Degradation

<TABLE>
<CAPTION>
        ---------------------------------------------------------------------------------------------------
                                                    EIRP                                Percent
          Performance Level                         dbW                               Degradation
        ---------------------------------------------------------------------------------------------------
                  <S>                                 <C>                                  <C>



                  *                                   *                                    *


        ---------------------------------------------------------------------------------------------------
</TABLE>
         Test Conditions:

                                       *

         3) The degradation percentage for each individual antenna beam is
         determined by averaging the uplink and downlink degradation
         percentages.

         4) Using an astro-dynamics orbital model calculate the number of
         seconds that a hypothetical user at * degrees latitude is covered by
         each degraded antenna beam. The individual antenna beam coverage
         patterns to be used in this calculation shall be defined in the model
         defined by Contractor and presented at the Space System Critical
         Design Review.

         The resulting coverage seconds for each degraded antenna beam shall be
         determined by a weighted average of the resulting data points. The
         weighted average shall be calculated using the equation shown below.

                                       *

         (Note: If the system operator has adjacent beams available to
         partially cover the degraded coverage area and reconfigures the system
         accordingly this will reduce the degrade coverage seconds beginning at
         the time the reconfiguration takes place.)

         5) Each of the coverage seconds for each antenna beam in the
         constellation are then summed together weighted by the percentage
         degradations calculated in step 4 to determine the total degraded
         coverage seconds to be used in the calculation of the coverage factor
         (X). The degraded coverage seconds calculated in this step are equal
         to "B".

2.2      (NOT USED)


- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 3

<PAGE>   35

IRIDIUM Operations and Maintenance Contract

                                   EXHIBIT A
                               STATEMENT OF WORK


2.3      CALCULATION OF "C" FACTOR:

         1) Channel Capacity Degradation: Using a model defined by Contractor
         and presented at the Space System Critical Design Review calculate the
         capability of each of the antenna beams on each space vehicle in the
         operational constellation to support the Voice Subscriber Capacity per
         Beam Pattern specified in Paragraph 3.3-2 of the Statement of Work of
         the Space System Contract. (The Space System shall provide a maximum
         of * concurrent L-Band full duplex traffic channels in a single beam
         pattern.) This calculation shall be performed upon the detection of
         any failures that affect the capability to support the specified
         capacity. The failures that affect individual space vehicle antenna
         beam capacity include switching failures, modem failures, processor
         failures, etc. A complete listing of the applicable failures, method
         of detection, and model description has been provided at the Space
         Segment Critical Design Review under the Space System Contract.
         Calculate the percentage degradation to be used in the capacity factor
         (Y) calculations for each antenna beam based on the calculated voice
         subscriber capacity per beam as shown in Table 2.3.1

         TABLE 2.3.1
         VOICE SUBSCRIBER CAPACITY PER BEAM DEGRADATION PERCENTAGES

<TABLE>
<CAPTION>
         ----------------------------------------------------------------------------------
            Voice Subscriber Capacity                      Degradation Percentage Used
                    per Beam                                   in AASP Calculation
         ----------------------------------------------------------------------------------
                        <S>                                             <C>


                                                                        *
                        *



         ----------------------------------------------------------------------------------
</TABLE>

         2) Using an astro-dynamics orbital model calculate the number of
         seconds that a hypothetical user at * degrees latitude is covered by
         each antenna beam with degraded capacity. The individual antenna beam
         coverage patterns to be used in this calculation shall be defined in
         the model defined by Contractor and presented at the Space System
         Critical Design Review. The resulting coverage seconds for each
         degraded antenna beam shall be determined by a weighted


- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 4

<PAGE>   36


IRIDIUM Operations and Maintenance Contract

                                   EXHIBIT A
                               STATEMENT OF WORK


         average of the resulting data points.  The weighted average shall be
         calculated using the equation shown below.


                                       *

         (Note: If the system operator has adjacent beams available to
         partially cover the degraded coverage area and reconfigures the system
         accordingly this will reduce the degraded coverage seconds beginning
         at the time the reconfiguration takes place.)

         3) Each of the coverage seconds for each antenna beam in the
         constellation are then summed together weighted by the percentage
         degradations calculated in step 1) to determine the total degraded
         coverage to be used in the calculation of the capacity factor (Y). The
         degraded coverage seconds for each antenna beam cannot exceed 100% of
         the total coverage seconds for that beam. For example if the beam has
         totally failed the coverage as calculated in Paragraph 2.1, no
         additional degradation is taken for beam capacity for that beam.

         4) Crosslink Degradation: Identify critical failures in the space
         vehicle crosslink subsystems and the time duration of the critical
         failure. (Note: a critical failure is one that causes the associated
         crosslink to become non-operational)  Calculate the percentage
         degradation for each space vehicle based on the percentages shown in
         Table 2.3.2.



- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 5

<PAGE>   37


IRIDIUM Operations and Maintenance Contract

                                   EXHIBIT A
                               STATEMENT OF WORK


         Table 2.3.2
         Crosslink Degradation Percentages

<TABLE>
<CAPTION>
        --------------------------------------------------------------------------------------------------
                                   No. of In-plane             No. of Cross-                 Percent
         SV Plane                Crosslink failures          plane Crosslink               Degradation
                                                                failures
        --------------------------------------------------------------------------------------------------
             <S>                          <C>                        <C>                        <C>





             *                            *                          *                          *





        --------------------------------------------------------------------------------------------------
</TABLE>


         5) Gateway/SCS Link Degradation: Identify critical failures in the
         space vehicle gateway subsystems and the time duration of the critical
         failure. (Note: a critical failure is one that causes the associated
         Gateway/SCS link to become non-operational)  Calculate the percentage
         degradation for each space vehicle based on the percentages shown in
         Table 2.3.3.

         TABLE 2.3.3
         GATEWAY/SCS DEGRADATION PERCENTAGES
<TABLE>
<CAPTION>
        -----------------------------------------------------------------------------
                 No. of Gateway                                Percent Degradation
                    Failures

        -----------------------------------------------------------------------------
                        <S>                                             <C>


                        *                                               *


        -----------------------------------------------------------------------------
</TABLE>


         6) Total SV K-Band Link Degradation: For each space vehicle the
         percent total degradation for crosslinks and Gateway/SCS failures will
         then be calculated by summing the individual degradations determined
         in steps 4) and 5).  If the sum exceeds 100%, it will be deemed to be
         100%.

- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 6

<PAGE>   38


IRIDIUM Operations and Maintenance Contract

                                   EXHIBIT A
                               STATEMENT OF WORK


         7) Using an astro-dynamics orbital model calculate the number of
         seconds that a hypothetical user at * degrees latitude is covered by
         each space vehicle with failed K-Band links. The individual space
         vehicle coverage patterns to be used in this calculation shall be
         defined in the model defined by Contractor and presented at the Space
         System Critical Design Review. The resulting coverage seconds for each
         degraded space vehicle shall be determined by a weighted average of
         the resulting data points. The weighted average shall be calculated
         using the equation shown below.

                                      *

         (Note: If the system operator has adjacent beams available to
         partially cover the degraded coverage area and reconfigures the system
         accordingly this will reduce the degraded coverage seconds beginning
         at the time the reconfiguration takes place.)

         8) Each of the coverage seconds for each degraded space vehicle are
         then summed together weighted by the percentage degradations
         calculated in step 7) to determine the total degraded coverage seconds
         for K-Band link failures to be used in the calculation of the capacity
         factor (Y).

         9) The total degraded coverage seconds is the sum of the degraded
         coverage seconds calculated in steps 3) and 8).  The degraded coverage
         seconds calculated in this step are equal to "C".

2.4      The following examples illustrate the application of the formulas in
         this section to five (5) hypothetical factual situations.

         2.4.1  Example 1 (AASP Coverage Factor Example)


                                      *


         2.4.2  Example 2 (AASP Coverage Factor Example)


                                      *



- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 7

<PAGE>   39

IRIDIUM Operations and Maintenance Contract


                                   EXHIBIT A
                               STATEMENT OF WORK


         2.4.3  Example 3 (AASP Capacity Factor Example)


                                       *


         2.4.4  Example 4 (AASP Capacity Factor Example)


                                       *


         2.4.5  Example 5 (AASP Coverage and Capacity Factors Example)


                                       *



- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 8

<PAGE>   40


IRIDIUM Operations and Maintenance Contract

                                   EXHIBIT A
                               STATEMENT OF WORK





                                       *




- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                     Page 9

<PAGE>   41


IRIDIUM Operations and Maintenance Contract


                                   EXHIBIT A
                               STATEMENT OF WORK





                                       *




- ----------------------------------------

*        Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                    Page 10




<PAGE>   1
                                                                   EXHIBIT 10.8

                       MOTOROLA CONFIDENTIAL PROPRIETARY




                                   IRIDIUM(R)


                              TERRESTRIAL NETWORK
                              DEVELOPMENT CONTRACT


                                    BETWEEN



                                  IRIDIUM LLC

                                      AND

                                 MOTOROLA, INC.




CONTRACT EFFECTIVE DATE: JAN 01, 1993
(CONFORMED 1/14/97 TO INCLUDE AMENDMENTS TO NO. 1 AND 2)

- ---------------

IRIDIUM IS A REGISTERED TRADEMARK AND SERVICE MARK OF IRIDIUM LLC.
<PAGE>   2
                       MOTOROLA CONFIDENTIAL PROPRIETARY

TABLE OF CONTENTS
- --------------------------------------------------------------------------------

<TABLE>    
<CAPTION>                                                                                   
         TITLE                                                                                           PAGE
         <S>                                                                                               <C>
         TABLE OF CONTENTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
         TERRESTRIAL NETWORK DEVELOPMENT CONTRACT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         RECITALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         ARTICLE 1.    DEFINITIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
         ARTICLE 2.    DESCRIPTION OF WORK  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         ARTICLE 3.    INTEROPERABILITY   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         ARTICLE 4.    DELIVERY SCHEDULE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         ARTICLE 5.    PRICE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         ARTICLE 6.    PAYMENT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         ARTICLE 7.    TITLE TRANSFER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
         ARTICLE 8.    CHANGES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
         ARTICLE 9.    IRIDIUM'S ACCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
         ARTICLE 10.   WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
         ARTICLE 11.   INTELLECTUAL PROPERTY RIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
         ARTICLE 12.   DEFAULT BY MOTOROLA  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
         ARTICLE 13.   DEFAULT BY IRIDIUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
         ARTICLE 14.   LIMITATION OF LIABILITY  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         ARTICLE 15.   DISCLOSURE AND USE OF INFORMATION BY THE PARTIES . . . . . . . . . . . . . . . . .  10
         ARTICLE 16.   ASSOCIATE CONTRACTOR REQUIREMENTS  . . . . . . . . . . . . . . . . . . . . . . . .  11
         ARTICLE 17.   TAXES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         ARTICLE 18.   EXCUSABLE DELAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         ARTICLE 19.   EXPORT REGULATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         ARTICLE 20.   ASSIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         ARTICLE 21.   RELATIONSHIP WITH OTHER AGREEMENTS . . . . . . . . . . . . . . . . . . . . . . . .  13
         ARTICLE 22.   NOTICES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         ARTICLE 23.   AUTHORIZED REPRESENTATIVES . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         ARTICLE 24.   EXHIBIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
         ARTICLE 25.   ORDER OF PRECEDENCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
         ARTICLE 26.   DISPUTES AND GOVERNING LAW . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
         ARTICLE 27.   ENTIRE AGREEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
         ARTICLE 28.   EFFECTIVE DATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         ATTACHMENT 1  FORM OF WARRANT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
</TABLE>


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                       MOTOROLA CONFIDENTIAL PROPRIETARY

TERRESTRIAL NETWORK DEVELOPMENT CONTRACT
- --------------------------------------------------------------------------------


THIS TERRESTRIAL NETWORK DEVELOPMENT CONTRACT (hereinafter "Contract") is
entered into between Motorola, Inc., acting through the Satellite
Communications Division of its Space and System Technology Group (hereinafter
called "Motorola"), a corporation organized under the laws of the State of
Delaware with its offices located at 2501 South Price Road, Chandler, Arizona
85248-2899 and Iridium LLC (hereinafter called "Iridium"), a Delaware limited
liability company with its principal office located at 1401 H Street, NW,
Washington, D.C. 20005.  Motorola and Iridium are hereafter sometimes
individually referred to as "Party" and collectively as the "Parties."

RECITALS

      A.     On June 26, 1990, Motorola formally announced that it intended to
             develop a global communication system that would allow
             communication via portable radio telephones - whether on land, at
             sea or in the air.  The new system, known as the IRIDIUM
             Communications System ("System"), has at the heart of its
             operation a Constellation of nominally sixty-six (66) satellites
             in low-earth orbit working together as a digitally-switched
             communications network in space.  The System is intended to handle
             both voice and data.  One or more ground-based spacecraft control
             facilities will maintain the satellite Constellation and overall
             operation of the System.

      B.     A key component of the System will be a network of "Gateway"
             surface facilities in various countries that will link the
             satellites with the Public Switched Telephone Network.  These
             Gateways are expected to collect and forward, as required,
             customer billing information and keep track of each user's
             location.

      C.     Other key components to the System are the Individual Subscriber
             Units (ISUs) and Mobile Exchange Units (MXUs).

      D.     On June 14, 1991 Motorola incorporated Iridium, Inc. to become,
             among other things, the owner of the Space System portion of the
             System.

      E.     A Space System Contract executed by Motorola and Iridium, as
             amended, became effective on July 29, 1993.  It is intended to
             function as the mechanism whereby Motorola will sell to Iridium
             the Space System portion of the System.

      F.     An Operations and Maintenance Contract executed by Motorola and
             Iridium, as amended, became effective on July 29, 1993.  It is
             intended to function as the mechanism whereby Motorola will
             operate and maintain the Space System for a period of five years
             upon completion of the Space System Contract.

      G.     Separate contracts between Motorola and other appropriate parties
             will provide for the production and sale of the Gateways, ISUs,
             MXUs and other components of the System.

      H.     The Space System Contract, as amended, requires Motorola to
             develop and sell Gateways and to license certain intellectual
             property to third party manufacturers,





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

             acceptable to Motorola, the rights to use such certain
             intellectual property to manufacture and sell Gateways.

      I.     Under the terms of this Terrestrial Network Development Contract,
             Iridium will receive a license to use certain intellectual
             property associated with the Gateway as developed by Motorola.
             Such intellectual property may be used by Iridium to procure the
             development and manufacture of Gateways from sources other than
             Motorola.  This license is in addition to the license provided to
             Iridium under the Space System Contract, as amended.  However,
             this Contract does not include a license to the Voice Encoding
             Algorithm which is necessary for Gateway interoperability with the
             Space System.

      J.     In consideration of the amounts to be paid by Iridium to Motorola
             under the terms of this Terrestrial Network Development Contract,
             Motorola will be substantially reducing the base prices for the
             Gateway Equipment it will be offering to sell to prospective
             Gateway purchasers.

ARTICLE 1.  DEFINITIONS

      Capitalized terms used and not otherwise defined herein shall have the
      following meanings:

      A.     Constellation or Space Segment: That part of the complete IRIDIUM
             Communications System consisting solely of the space vehicles
             (also referred to as spacecraft or satellites) in low-earth orbit.
             It does not include the System Control Segment, Gateways, ISUs,
             MXUs or other components necessary for complete utilization of the
             IRIDIUM Communications System.

      B.     Gateway: The Gateways encompass the ground-based facilities
             constructed in accordance with the Gateway Interface Specification
             supporting the subscriber billing/information functions in
             addition to call processing operations and the connection of the
             IRIDIUM subscriber communications to the Public Switched Telephone
             Network (PSTN).

      C.     Gateway Design Package: The documents being delivered hereunder
             which provide data usable for other Gateway design and development
             efforts.  These documents are specified in Section 4.3 of Exhibit
             A of this contract.

      D.     Gateway Interface Specification: The functional specification
             prepared by Motorola that defines the radio frequency interface,
             logical and physical protocols, and functionality necessary for
             Gateway Interoperability with the Space System.  It does not
             include the Voice Encoding Algorithm necessary for complete
             interoperability with the IRIDIUM Communications System.

      E.     Interoperable or interoperate: The terms "interoperable" and
             "interoperate" shall mean, in this Contract, that these components
             will be designed to function individually and collectively to
             provide IRIDIUM communications services, and that where necessary
             in such interoperation, will be interconnectable in accordance
             with the





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

             applicable interface specifications and the applicable
             specifications contained in the Space System Contract, as amended.

      F.     IRIDIUM Communications System: The complete integrated
             satellite-based digitally-switched communication system.  This
             term refers collectively to the Space Segment, System Control
             Segment, Gateways and Subscriber Unit Segment.

      G.     MILESTONES: The term "Milestone" or "Milestones" refer to the
             specific milestones described in the Statement of Work (Exhibit
             A).

      H.     Mobile Exchange Units (MXUs): The equipment designed to
             interconnect multiple voice or data channels to the IRIDIUM
             Communications System using the subscriber unit radio frequency
             interface to the Space System.

      I.     PSTN-interconnectable: The term "PSTN-interconnectable" shall
             mean, in this Contract, that the Gateway's Switching Center will
             operate with PSTNs which use either the common industry standard
             international Multi-Frequency Compelled ("MFC-R2 International")
             or Signaling System Seven Integrated Services User Part
             ("SS7/ISUP") signaling and addressing protocols.  For the
             end-to-end message signaling, the Gateway's Switching Center will
             use the Dual Tone Multi-Frequency ("DTMF") signaling protocols of
             the International Telecommunications Union (formerly CCITT).

      J.     Space System: This term refers to the integrated combination of
             the Space Segment and System Control Segment.

      K.     Space Vehicles: The terms space vehicle, satellite, or spacecraft
             all have the same meaning throughout this Contract and refer to
             the individual or multiple satellites of the Constellation.

      L.     Subscriber Unit Segment: The Subscriber Unit Segment refers
             collectively to the individual equipment units generally referred
             to as Individual Subscriber Units (ISUs) to be used by subscribers
             and capable of initiating and receiving communications through the
             IRIDIUM Communications System.  These may include, for example,
             hand-held portable units, aircraft units, marine units, portable
             office units, and pay phone units.  As used herein, this term also
             includes paging units.

      M.     System Control Segment (SCS): This term refers to the various
             ground-based sites, equipment, and facilities to manage and
             control the individual space vehicles of the Constellation, and
             the communication links of the IRIDIUM Communications System in
             accordance with the performance levels specified in the Space
             System and Operations and Maintenance Contracts.  The System
             Control Segment is composed of a Master Control Facility (MCF),
             and Backup Control Facility (BCF), and associated Telemetry,
             Tracking and Command Facilities (TTACs).

      N.     Terrestrial Network: As used herein, this term refers to the
             IRIDIUM Communications System's Gateways.





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

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                       MOTOROLA CONFIDENTIAL PROPRIETARY

      O.     Voice Encoding Algorithm: As this term is used in this Contract it
             refers to the algorithm used to encode and decode analog voice to
             and from compressed digital speech.

      P.     Gateway Equipment: The hardware and software for the IRIDIUM
             Gateway necessary to perform the functions specified in Section
             3.1 of Exhibit A of this document.

      Q.     Initial GEPAs: GEPAs for the installation of Gateway Equipment for
             the following IRIDIUM Investors, provided the installation of such
             Gateway Equipment is scheduled to occur prior to the Commercial
             Activation Date:

             1.    Iridium U.S., L.P.

             2.    Iridium SudAmerica

             3.    Nippon Iridium Corp.

             4.    United Communication Industry Public Company Limited
                   [Thai Satellite Telecommunications Co., Ltd.]

             5.    Pacific Communications Co., Ltd. - #1 [Taiwan]

             6.    Pacific Communications Co., Ltd. - #2 [Indonesia]

             7.    Iridium Services Deutschland and STET

             8.    Khrunichev State Research and Production Space Center

             9.    Iridium China (Hong Kong), Ltd.

             10.   Iridium India Telecom, Ltd.

             11.   Korea Mobile Telecommunications Corp.

      R.     Pre-Commercial Service Warranty: The services described in
             Paragraph 6.0 of Exhibit A hereto.

      U.     GTAC Services: The services described in Paragraph 7.0 of Exhibit
             A hereto.

      V.     Commercial Activation Activities: The activities set forth in
             Paragraph 8.0 of Exhibit A hereto.

      W.     Commercial Activation Date: The date of the first "Revenue
             Producing Communication Message," as that term is defined in the
             Space System Contract.

      X.     GEPA: A Gateway Equipment Purchase Agreement between Motorola and
             a Gateway Equipment purchaser.

ARTICLE 2.  DESCRIPTION OF WORK

      A.     Motorola shall design the hardware and software of the generic
             IRIDIUM Gateway in accordance with the Statement of Work, Exhibit
             A, and the Milestone Schedule contained therein.





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

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                       MOTOROLA CONFIDENTIAL PROPRIETARY

      B.     Motorola shall deliver to Iridium, in accordance with the
             provisions of this Contract, the then-current Gateway Design
             Package, as defined herein, and the license to use the data
             contained therein as provided by the Article herein entitled,
             INTELLECTUAL PROPERTY RIGHTS.

      C.     Motorola shall permit Iridium, subject to the Article herein
             entitled IRIDIUM'S ACCESS, opportunities to review Motorola's
             progress in performing the work under this Contract.  Such reviews
             may be a part of the Milestones described in Exhibit A, hereto.

      D.     Motorola shall provide the Pre-Commercial Service Warranty for
             Gateway Equipment systems for which Conditional Acceptance occurs,
             pursuant to the terms of the GEPA under which such Gateway
             Equipment has been purchased, prior to the Commercial Activation
             Date.

      E.     Motorola shall provide the GTAC Services starting upon the later
             to occur of the commencement by Iridium of the Commercial
             Activation Activities or April 1, 1998, and ending on the
             Commercial Activation Date.

      F.     Motorola shall provide the Commercial Activation Activities
             support as set forth in Section 8.0 of Exhibit A hereto.

ARTICLE 3.  INTEROPERABILITY

      Motorola will use its reasonable best efforts to design and develop the
      various ground components of the IRIDIUM Communications System, for
      example, Gateways, Subscriber Units and Mobile Exchange Units, to be sold
      by Motorola to third parties under mutually acceptable conditions such
      that these components will be interoperable with the IRIDIUM Space
      System, and, as appropriate, through the IRIDIUM Space System, and with
      each other, and, that, collectively, they will interoperate with the
      IRIDIUM Space System to, as appropriate, provide IRIDIUM communications
      service of the quality specified in Section 3.2 of Exhibit B of the Space
      System contract and Section 3.2 of the Statement of Work of this
      Contract, and be PSTN-interconnectable.

ARTICLE 4.  DELIVERY SCHEDULE

      Motorola shall perform the work required under Paragraphs A, B and C of
      ARTICLE 2, DESCRIPTION OR WORK, and deliver the then-current Gateway
      Design Package to Iridium in accordance with the Milestone Performance
      Schedule contained in Exhibit A hereto (as it may be amended in
      accordance with the terms of this Contract).  Motorola shall perform the
      work required pursuant to Paragraphs D, E and F of ARTICLE 2, DESCRIPTION
      OF WORK as set forth in this Contract.

ARTICLE 5.  PRICE

      A.     For performance of this Contract, exclusive of the work required
             pursuant to Paragraphs D, E and F of ARTICLE 2 hereof, entitled,
             "DESCRIPTION OF WORK",





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

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                       MOTOROLA CONFIDENTIAL PROPRIETARY

             Iridium shall pay Motorola the fixed price of one hundred sixty
             million dollars ($160,000,000 U.S.).

      B.     For performance of the work required pursuant to Paragraphs D, E
             and F of ARTICLE 2 hereof, entitled "DESCRIPTION OF WORK", Iridium
             shall either (i) transfer to Motorola five thousand five hundred
             forty five (5,545) warrants, in substantially the form attached
             hereto as Attachment 1, relating to Class 1 Interests in Iridium,
             or (ii) pay to Motorola the fixed price of eighteen million nine
             hundred thousand dollars ($18,900,000 U.S.).

ARTICLE 6.  PAYMENT

      A.     The fixed price of $160,000,000 shall be paid in accordance with
             the Milestone schedule contained in Exhibit A, hereto.

      B.     The Milestone prices specified in Exhibit A shall, in each case,
             be paid by Iridium to Motorola within thirty (30) calendar days
             following completion of each Milestone and receipt of Motorola's
             invoice for these payments.  Payment to Motorola shall be made by
             cable/wire transfer to a banking institution as Motorola
             designates or by such other means as Motorola may designate from
             time to time.

      C.     In the event Motorola completes a specific Milestone prior to the
             scheduled completion date in Exhibit A (as such dates may be
             adjusted pursuant to the terms of this Contract), Iridium shall
             not be obligated to make the payment associated with such
             Milestone until thirty (30) days after such scheduled completion
             date.

      D.     Iridium shall have the right to challenge the assertion of
             Motorola that any Milestone has been completed in accordance with
             the Milestone completion Criteria by providing Motorola with
             written notice to such effect within twenty (20) days following
             receipt of Motorola's invoice.  Such notice shall summarize the
             reasons for such challenge and Motorola shall respond thereto in
             writing or orally within five (5) days of receipt of such
             challenge.  Failure to resolve any dispute between Motorola and
             Iridium with respect to any such challenge shall be resolved in
             accordance with the Article herein entitled, DISPUTES AND
             GOVERNING LAW.  Nothing herein shall be construed to limit
             Iridium's rights under the Article herein entitled DEFAULT BY
             MOTOROLA, nor Motorola's rights under the Article herein entitled
             DEFAULT BY IRIDIUM.

      E.     Notwithstanding Motorola's inability to demonstrate compliance
             with the criteria of the Statement of Work as required by
             Milestones 5 or 6 or 7 or 8, if, 1) Iridium chooses to use or
             permits others to use the Space System using the Gateway Equipment
             design developed hereunder after the scheduled completion date of
             Milestone Number 7; or, 2) if Motorola successfully performs the
             Acceptance Test Plan under a Gateway Equipment Purchase Agreement,
             the earlier of: a) the date of the first Revenue Producing
             Communication Message transmitted through the Space System using
             the Gateway Equipment design developed hereunder or any component
             thereof; or, b) the date of completion of a Release 2 Acceptance
             Test Plan under a Gateway Equipment





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

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                       MOTOROLA CONFIDENTIAL PROPRIETARY

             Purchase Agreement shall be deemed the date of completion and
             acceptance by Iridium of all items required to be delivered by
             Motorola under this Contract.  Iridium shall pay to Motorola all
             remaining amounts not yet paid by Iridium to Motorola under this
             Contract on the date or dates payment would have been due in
             accordance with the Milestone Schedule contained in Exhibit A.
             Motorola shall, upon receipt of such payments as may be due for
             Milestones 9 and 10, promptly deliver to Iridium the then-current
             version of the Gateway Design Package and the license to use the
             data contained therein as provided by the Article herein entitled
             INTELLECTUAL PROPERTY RIGHTS.

      F.     The amount to be under Paragraphs B of ARTICLE 5, PRICE shall be
             due and payable not later than five (5) business days after the
             Commercial Activation Date.

ARTICLE 7.  TITLE TRANSFER

      Title to the Gateway Design Package delivered hereunder shall not pass to
      Iridium.  Motorola and its subcontractors shall retain title to such
      documents and Iridium shall only receive the limited rights to use such
      documents as such rights are specified in the Article herein entitled,
      INTELLECTUAL PROPERTY RIGHTS.

ARTICLE 8.  CHANGES

      Changes to this Contract may be made only by mutual agreement of the
      parties hereto.  Such changes shall be evidenced by a written agreement
      executed by authorized representatives of both parties.  No change shall
      be binding on either party unless and until such written document is
      fully executed by both parties.

ARTICLE 9.  IRIDIUM'S ACCESS

      For the purpose of observing the status of Motorola's performance of
      work, Motorola shall afford a limited number of Iridium's employees or
      designees, as approved by Motorola and subject to the Article herein
      entitled EXPORT REGULATIONS, access to those Contract Milestone
      activities specified in Exhibit A Progress Payments, Milestones and
      Deliverable at Motorola's and its first-tier subcontractor's facilities
      subject to such subcontractor's approval and on a non-interference basis.
      Motorola's approval of designees requested by Iridium shall not be
      unreasonably withheld; provided, however, that such approval may be
      withheld if Motorola or its first-tier subcontractor(s) have reasonable
      concerns as to the protection of their proprietary information or
      potential injury to their competitive market position(s).

ARTICLE 10.  WARRANTY

      Motorola warrants that the Gateway Design Package, as of the date it is
      delivered to Iridium, will contain Motorola's then-current revision of
      the Gateway Interface Specification and Iridium Gateway Segment
      Specification.  Motorola agrees that, if it revises such documents during
      the twelve (12) month period following such delivery to Iridium to
      correct such





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

      documents for Motorola-determined errors or omissions, that it will
      deliver one copy of such revised versions of such documents to Iridium.
      Furthermore, Motorola makes no other warranty with respect to the Gateway
      Design Package.  THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES,
      WHETHER STATUTORY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO A
      WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE AND ANY
      WARRANTIES OF DESIGN ALL OF WHICH ARE EXPRESSLY DISCLAIMED AND EXCLUDED.
      This Article shall not be construed or interpreted as limiting or
      reducing Motorola's obligations as set forth in Article 2 of this
      Agreement.

ARTICLE 11.  INTELLECTUAL PROPERTY RIGHTS

      A.     To the extent that Motorola has the right to do so, Iridium shall
             have a paid-up, non-exclusive, non-transferable license with
             respect to the information which is contained in the Gateway
             Design Package as defined herein delivered to Iridium by Motorola
             in connection with this Contract to use, have used, make and have
             made for "IRIDIUM purposes" all data and inventions which are part
             of that information (a) which were created by employees of
             Motorola in the performance of this Contract or (b) which were
             created by employees of subcontractors to Motorola in the
             performance of this Contract.

      B.     In addition and to the extent that Motorola has the right to do
             so, Iridium shall have a non-exclusive, non-transferable,
             royalty-bearing license (whose terms will be mutually agreed upon)
             with respect to any invention covered by a patent owned by
             Motorola or licensed to Motorola (with a right of Motorola to
             sublicense), which invention is directly incorporated in the
             Gateway Design Package delivered to Iridium by Motorola in
             connection with this Contract to use, have used, make and have
             made for "IRIDIUM purposes" any such invention, but only if and to
             the extent that such invention is essential for Iridium to procure
             Gateways from third parties.  To the extent Motorola's
             subcontractors' have agreed to license to Motorola such patents
             covered by this paragraph with a right to sublicense to Iridium
             for the purposes covered by this paragraph, Motorola agrees to
             negotiate the royalties and other terms associated with such
             licenses directly with such subcontractors.  With respect to the
             license of Motorola's patents covered by this paragraph, Motorola
             agrees that the amount of such royalty to be paid by Iridium shall
             be a commercially reasonable amount.

      C.     "IRIDIUM purposes" means the use by Iridium in connection with the
             design, development, construction, establishment, operation and
             maintenance of the Gateways.

      D.     The above licenses will become effective upon delivery of the
             Gateway Design Package as provided herein.

      E.     If any written material furnished as part of the Gateway Design
             Package is copyrighted, Iridium shall have an unlimited right to
             make copies of such copyrighted material and to use such copies
             for "IRIDIUM purposes" without payment of additional





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

             compensation to Motorola only to the extent that Motorola has the
             authority to grant such right.  In the event Motorola does not
             have such right, Motorola will use its best reasonable efforts to
             obtain such rights for Iridium.  In the event that the obtaining
             of such rights involves the payment of a fee, Iridium shall
             reimburse Motorola for said fee.

      F.     Notwithstanding the license grants in Paragraphs A&B above, the
             parties agree that all data pertaining to manufacturing processes
             technology, semiconductor technology and terrestrial cellular
             networks or components, that are or may be delivered or disclosed
             by Motorola to Iridium in the Gateway Design Package or otherwise
             shall be subject to the Article herein entitled DISCLOSURE AND USE
             OF INFORMATION BY THE PARTIES and Iridium acquires no rights,
             title or interest in such intellectual property or other
             intellectual property associated with the design of the IRIDIUM
             Communications System except as may be negotiated in other license
             agreements between Motorola and Iridium pursuant to reasonable
             terms and conditions mutually acceptable to Motorola and Iridium.

ARTICLE 12.  DEFAULT BY MOTOROLA

      A.     Iridium may, by written notice of default sent by registered
             letter to Motorola, terminate this Contract for cause upon the
             occurrence of any of the following circumstances:

             1.    if Motorola fails to make delivery of the Gateway Design
                   Package and complete all Milestones of this Contract within
                   four (4) months of the scheduled completion date of the
                   final Milestone (as may be adjusted under this Contract);
                   or,

             2.    if Motorola fails to perform any of the other material
                   provisions of this Contract or fails to timely complete one
                   or more of the Milestones so as to prevent completion of the
                   final Milestone of this Contract within four (4) months of
                   the scheduled date (as may be adjusted under this Contract),
                   and in either of these two circumstances does not act to
                   commence correction of such failure within a period of
                   thirty (30) days (or such longer period as Iridium may
                   authorize in writing) after receipt of notice from Iridium
                   specifying such failure.  Notwithstanding such default,
                   Motorola shall be entitled to payment as provided in Article
                   6, Paragraph E if the conditions set forth therein are met.

      B.     If this Contract is terminated as provided in this Article,
             Motorola shall:

             1.    to the extent that it has the right to do so, deliver to
                   Iridium the then-current version of the Gateway Design
                   Package as of the effective date of any such termination
                   along with the intellectual property licenses specified in
                   the Article herein entitled INTELLECTUAL PROPERTY RIGHTS;
                   and,

             2.    be paid a percentage of the total price of this contract
                   equal to the actual percentage of completion of the Gateway
                   Design Package that is completed as of the effective date of
                   such termination action; and,





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

             3.    subject to the Article herein entitled LIMITATION OF
                   LIABILITY, pay to Iridium all reasonable costs to have this
                   Contract completed by another responsible contractor, to the
                   extent such costs exceed the total amount which Iridium
                   would have had to pay Motorola for this Contract had
                   Motorola completed the Contract as required; provided,
                   however, that Iridium enters into a Contract with a
                   responsible contractor to complete the terminated effort
                   within one (1) year of notification of termination for
                   default.

      C.     NOTWITHSTANDING ANY PROVISION IN THIS CONTRACT TO THE CONTRARY,
             THE REMEDIES SET FORTH IN THIS ARTICLE SHALL BE THE SOLE RECOURSE
             AND MOTOROLA'S TOTAL LIABILITY TO WHICH IRIDIUM IS ENTITLED IN THE
             EVENT OF MOTOROLA'S DEFAULT OR FOR ANY OTHER CLAIM AGAINST
             MOTOROLA ARISING DIRECTLY OR INDIRECTLY OUT OF THIS CONTRACT
             WHETHER IN CONTRACT, WARRANTY, TORT OR OTHERWISE.

      D.     If, after Iridium gives Motorola notice of default, it is
             determined for any reason that Motorola was not in default under
             the provisions of this Article, or that the delay was excusable
             under the provisions of the Article herein entitled EXCUSABLE
             DELAYS, the rights and obligations of the parties shall be the
             same as if Iridium defaulted in the performance of its obligations
             under this Contract as provided by the Article herein entitled
             DEFAULT BY IRIDIUM.

ARTICLE 13.  DEFAULT BY IRIDIUM

      A.     Motorola may, by written notice of default sent by registered
             letter to Iridium, terminate this Contract for cause upon the
             occurrence of any of the following circumstances:

             1.    if Iridium fails to make timely payments as required by the
                   Article herein entitled PAYMENT and does not make any such
                   required payment within thirty (30) days after notice from
                   Motorola; or,

             2.    if Iridium fails to perform any other material obligation
                   which it is required to perform pursuant to this Contract
                   and Iridium does not act to commence correction of such
                   failure within thirty (30) days (or such longer period that
                   Motorola may authorize in writing) after notice of such
                   failure is received from Motorola.

      B.     If this Contract is terminated pursuant to this Article, Iridium
             shall, within thirty (30) days after receipt of Motorola's notice
             of default under this Article, pay Motorola the total price of
             this Contract less any payments previously made by Iridium
             hereunder.

      C.     If this Contract is terminated pursuant to this Article, upon
             receipt by Motorola of the total amount payable by Iridium under
             Paragraph B above, Iridium shall be entitled to receive the
             Gateway Design Package along with the intellectual property
             licenses specified in the Article herein entitled INTELLECTUAL
             PROPERTY RIGHTS.





                                       10

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   13
                       MOTOROLA CONFIDENTIAL PROPRIETARY

      D.     THE REMEDIES SET FORTH IN THIS ARTICLE SHALL BE THE SOLE RECOURSE
             TO WHICH MOTOROLA IS ENTITLED IN THE EVENT OF IRIDIUM'S DEFAULT,
             AND EXCEPT AS PROVIDED ABOVE, IRIDIUM SHALL HAVE NO LIABILITY FOR
             SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR FOR LOST
             PROFITS OR LOST REVENUES.

      E.     If, after Motorola gives Iridium a notice of default, it is
             determined for any reason that Iridium was not in default under
             the provisions of this Article, or that the delay was excusable
             under the provisions of the Article herein entitled EXCUSABLE
             DELAYS, the rights and obligations of the parties shall be the
             same as if Motorola defaulted in the performance of its
             obligations under this Contract as provided by the Article herein
             entitled DEFAULT BY MOTOROLA.

ARTICLE 14.  LIMITATION OF LIABILITY

      A.     IN NO EVENT SHALL MOTOROLA BE LIABLE TO IRIDIUM EXCEPT AS LIMITED
             AND EXPRESSLY SET FORTH IN ARTICLES 12 AND 13, WHETHER IN
             CONTRACT, WARRANTY, TORT, NEGLIGENCE OR OTHERWISE, INCLUDING
             WITHOUT LIMITATION ANY LIABILITY FOR SPECIAL, INCIDENTAL OR
             CONSEQUENTIAL DAMAGES, OR FOR LOST PROFITS OR REVENUES.

      B.     FURTHERMORE, IN NO EVENT AND UNDER NO CIRCUMSTANCES SHALL MOTOROLA
             BE LIABLE TO IRIDIUM IN A CUMULATIVE AMOUNT IN EXCESS OF
             $100,000,000 (U.S.) FOR ANY AND ALL COSTS, DAMAGES, CLAIMS OR
             LOSSES WHATSOEVER ARISING OUT OF OR RELATED TO THIS CONTRACT, THE
             SPACE SYSTEM CONTRACT, THE OPERATIONS AND MAINTENANCE CONTRACT AND
             ANY OTHER CONTRACT EXECUTED BETWEEN IRIDIUM AND MOTOROLA IN
             CONNECTION WITH THE IRIDIUM COMMUNICATIONS SYSTEM, OR ANY
             PROVISION HEREUNDER OR THEREUNDER WHETHER PURSUED AS A BREACH
             (I.E. DEFAULT) OF THE CONTRACT OR AS A TORT OR OTHER CAUSE OF
             ACTION AND WHETHER ACCRUING BEFORE OR AFTER COMPLETION OF ALL THE
             WORK REQUIRED TO BE PERFORMED UNDER THIS OR SUCH OTHER CONTRACTS.

ARTICLE 15.  DISCLOSURE AND USE OF INFORMATION BY THE
             PARTIES

      A.     "Proprietary Information" is defined as information which the
             disclosing party at the time of disclosure identifies in writing
             as Proprietary Information by means of a proprietary legend,
             marking, stamp or other positive written notice identifying the
             information to be proprietary.  In order for information disclosed
             orally or visually by a party to this Contract to be Proprietary
             Information protected hereunder, the disclosing party shall
             identify the information as proprietary at the time of the
             disclosure and, within thirty (30) days after such oral or visual
             disclosure, reduce the subject matter of the disclosure to
             writing, properly stamped with the proprietary





                                       11

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   14
                       MOTOROLA CONFIDENTIAL PROPRIETARY

             legend, marking, stamp or other positive written notice and submit
             it to the receiving party.

      B.     Except as may be specifically provided otherwise in this Contract,
             Proprietary Information of Motorola disclosed hereunder to Iridium
             may only be used by Iridium for monitoring the progress of the
             performance of this Contract by Motorola.

      C.     It is agreed that for a period of ten (10) years following the
             receipt of Proprietary Information, the receiving party will use
             such information only for the purpose(s) provided in Paragraphs B
             and C, above, as applicable, and shall take reasonable efforts to
             preserve in confidence such Proprietary Information and prevent
             disclosure thereof to third parties.  Each of the parties agree
             that it will use the same reasonable efforts to protect the
             other's Proprietary Information as are used to protect its own but
             will at least use reasonable care.  Disclosures of such
             information shall be restricted to those individuals directly
             participating in the efforts provided in Paragraphs B and C,
             above, who have a need to know such information and who have been
             made aware of and consent to abide by the restrictions contained
             herein concerning the use of such information.

      D.     The obligation to protect Proprietary Information and the
             liability for unauthorized disclosure or use of Proprietary
             Information shall not apply with respect to such information which
             is now available or becomes available to the public without breach
             of this Contract; information lawfully received without
             restrictions from other sources; information known to the
             receiving party prior to disclosure not subject to a separate
             nondisclosure obligation; information published or disclosed by
             the disclosing party to others, without restriction; information
             developed by the receiving party independent of and without use of
             the information disclosed by the disclosing party; information for
             which further use or disclosure by the recipient is authorized in
             writing by the disclosing party; or information required to be
             disclosed to any persons involved in insuring risks hereunder.

      E.     Upon termination of this Contract each party may request, within a
             reasonable period of time thereafter, the return of all
             Proprietary Information delivered under this Contract to the other
             party and copies made thereof by the receiving party, except that
             each party may retain an archived copy to be used only in case of
             a dispute concerning the Contract.  Each party agrees to comply
             with such request by the other party and to return within a
             reasonable time the Proprietary Information requested by the party
             providing such information.

ARTICLE 16.  ASSOCIATE CONTRACTOR REQUIREMENTS

      Iridium and all contractors to Motorola for the IRIDIUM Communications
      System are hereby defined as "Associate Contractors." In the performance
      of this Contract, Iridium shall, to the extent requested by Motorola,
      work cooperatively with other Associate Contractors in the cooperative
      development of the IRIDIUM Communications System.





                                       12

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   15
                       MOTOROLA CONFIDENTIAL PROPRIETARY

      Iridium expressly agrees that its Proprietary Information as described in
      the Article hereof entitled Intellectual Property Rights may be made
      available by Motorola to Associate Contractors, provided that such
      Associate Contractors have agreed in writing to protect such Proprietary
      Information substantially in accordance with the same provisions
      contained in the Article hereof entitled DISCLOSURE AND USE OF
      INFORMATION BY THE PARTIES.  Iridium understands that, in order to ensure
      the successful development of the IRIDIUM Communications System, Motorola
      and its Associate Contractors may need to disclose or receive Proprietary
      Information directly with one another and Iridium hereby expressly agrees
      to such exchanges.  Iridium agrees that it will use and protect the
      Proprietary Information of Associate Contractors on the same basis as it
      is permitted to use and is obligated to protect Motorola Proprietary
      Information as provided in the Article hereof entitled DISCLOSURE AND USE
      OF INFORMATION BY THE PARTIES.

ARTICLE 17.  TAXES

      A.     The price of this Contract referred to in the Article herein
             entitled PRICE, includes all transportation and related charges
             and all applicable taxes, duties, and similar liabilities
             whatsoever for delivery of all items to the specified destination
             in the continental United States, except any tax on the sale to
             Iridium of any item delivered hereunder.  Iridium will reimburse
             Motorola for any such sales or use tax, or duty drawback claim
             Motorola is required by law to pay.

      B.     If requested by the other party, Motorola and Iridium will
             cooperate with each other in contesting and/or protesting those
             taxes which either party reasonably deems inappropriate.  In
             return for such cooperation, Motorola and Iridium agree to
             indemnify each other against and hold each other harmless from any
             such tax that the other party is responsible to pay under
             Paragraph A above, and from any costs, expenses, penalties, or
             fees (including reasonable attorneys fees) which either party
             incurs in cooperating with the other.

ARTICLE 18.  EXCUSABLE DELAYS

      A.     Without limiting any other provision specifying what constitutes
             an excusable delay under this Contract, any event which causes a
             failure or delay to perform hereunder, and which is beyond the
             reasonable control and without the fault or negligence of Motorola
             and its subcontractors hereunder shall constitute an excusable
             delay, if notice thereof is given to Iridium within thirty (30)
             days after such event shall have occurred or within 30 days of
             Motorola's knowledge of such event.  Such excusable delay events
             include, but are not limited to, acts of God or of the public
             enemy; acts of governments in their sovereign or contractual
             capacity including government priorities, allocations, regulations
             or orders affecting materials, facilities, or, if applicable,
             completed spacecraft; fires; floods; snowstorms; earthquakes;
             epidemics; quarantine restrictions; strikes; labor difficulties;
             wars; and freight embargoes or any other event which causes
             failure or delay in performance hereunder and which is beyond the
             reasonable control of Motorola or its subcontractors hereunder.





                                       13

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   16
                       MOTOROLA CONFIDENTIAL PROPRIETARY

      B.     In the event of any such excusable delay, the performance schedule
             of this Contract shall be extended equitably and the price shall
             be adjusted to account for any additional costs incurred by
             Motorola as a result of such delay.  Motorola shall provide
             Iridium with evidence supporting Motorola's claim of excusable
             delay and shall mitigate such additional costs or schedule impact
             to the extent reasonable.

ARTICLE 19.  EXPORT REGULATIONS

      A.     Neither party shall export, directly or indirectly, any
             information or technical data disclosed under this Contract to any
             individual or country which the U.S. Government at the time of
             export requires an export license or other government approval
             without first obtaining such license or approval.  The parties
             recognize that Iridium may be composed of individuals or entities
             for which Iridium must ensure no disclosure of technical data
             unless and until Iridium obtains appropriate export licenses from
             the U.S. Government.

      B.     Motorola agrees to exert commercially reasonable efforts to design
             the Gateway Equipment to enable it to be exported from the United
             States, based upon Motorola's experiences with current U.S. laws
             and regulations, to the countries in which Gateways are
             contemplated to be located, which are: Australia, Bahrain, Brazil,
             Canary Islands (Spain), China (PRC), Cyprus, Germany, India,
             Indonesia, Italy, Japan, Kingdom of Saudi Arabia, South Africa,
             South Korea, Mexico, United States, Russian Federation, Taiwan
             (ROC), Thailand and United Arab Emirates.                         
                                                               
ARTICLE 20.  ASSIGNMENT

      Neither party shall assign or delegate this Contract or any of its
      rights, duties, or obligations thereunder to any other person without the
      prior express written approval of the other party except that Iridium
      agrees that Motorola may assign this Contract to any subsidiary or
      successor corporation of Motorola.  Nothing contained in this Article
      shall restrict Motorola from subcontracting work or procuring
      parts/materials or services in the ordinary course of performance of this
      Contract.
             
ARTICLE 21.  RELATIONSHIP WITH OTHER AGREEMENTS

      The following agreements relate to the effort described herein.  Nothing
      in this Contract shall be construed or interpreted as amending any of
      these other agreements.  The rights and responsibilities of the parties
      within each of these related agreements is set forth within each such
      separate and independent agreement.

      A.     RELATED EXISTING CONTRACTS

             1.    SPACE SYSTEM CONTRACT:  The Space System Contract covers the
                   design, development, production and delivery of the
                   integrated Space System of the IRIDIUM Communication System,
                   along with certain documentation as specified in that
                   contract.





                                       14

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   17
                       MOTOROLA CONFIDENTIAL PROPRIETARY

             2.    OPERATIONS AND MAINTENANCE CONTRACT:  The Operations and
                   Maintenance Contract (O&M Contract) covers the operation and
                   maintenance of the entire IRIDIUM Space System.  The five
                   (5) year period contemplated by the O&M Contract begins
                   immediately upon completion of the IRIDIUM Space System
                   Contract.  Generally the work required includes the
                   replacement of individual spacecraft of the Constellation as
                   necessary to maintain the performance and reliability levels
                   specified for the Space System.

             3.    MUTUAL NONDISCLOSURE AGREEMENT FOR COOPERATIVE ACTIVITIES:
                   This agreement is intended to cover discussions and the
                   exchange of data to the extent they are not covered by other
                   agreements between Motorola and Iridium.

                   (Note:  This Mutual Nondisclosure Agreement is not
                   applicable to any data exchanged between Motorola and
                   Iridium pertaining to the IRIDIUM Gateway or the Terrestrial
                   Network.  Information exchanged regarding the Gateways or
                   the Terrestrial Network is under the purview of this TNDC
                   Contract.)

      B.     RELATED CONTRACTS IN NEGOTIATIONS

             ENGINEERING ASSISTANCE AGREEMENT:  This contract is intended to
             provide engineering assistance and other services by Motorola to
             Iridium in excess of the effort included in the scope of the O&M
             Contract and the Space System Contract.  Such services could
             include system engineering design assistance in evaluating the
             utility of an enhanced design for the second or replacement Space
             System.

      C.     RELATED CONTRACTS TO BE NEGOTIATED

             1.    GATEWAY EQUIPMENT PURCHASE AGREEMENTS

             2.    GATEWAY ENGINEERING, PROCUREMENT AND CONSTRUCTION CONTRACTS

             3.    GATEWAY OPTIONAL SERVICES CONTRACTS





                                       15

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   18
                       MOTOROLA CONFIDENTIAL PROPRIETARY

ARTICLE 22.  NOTICES

      All correspondence, including notices, reports, and documentation
      deliverables, to be provided to Iridium or Motorola under this Contract
      shall be sent to Iridium or Motorola as follows:

<TABLE>
      <S>            <C>                                   <C>            <C>
      Iridium:       Iridium LLC                           Motorola:      Motorola, Inc.
      
      Address:       1401 H Street NW, Suite 800           Address:       2501 S. Price Rd.
                     Washington, D.C. 20005                               Chandler, AZ 85248-2899
      
      Attn:          Mr. Robert R. Call                    Attn:          Mr. Walter R. Rhodes

      Phone:         (202) 326-5648                        Phone:         (602) 732-2634
      
      Fax:           (202) 842-0006                        Fax:           (602) 732-4346
</TABLE>

ARTICLE 23.  AUTHORIZED REPRESENTATIVES

      The only representatives of Iridium and Motorola authorized to make
      changes to this Contract and to sign contractual documents are:

<TABLE>
      <S>                                                   <C>
      Iridium:                                              Motorola:

      Edward F. Staiano                                     Durrell L. Hillis
      F. Thomas Tuttle                                      Bary Bertiger
</TABLE>

      Either party may change its aforementioned representatives at any time by
      providing written notice to the other party.

ARTICLE 24.  EXHIBIT

      The following Exhibit is attached hereto and hereby incorporated as part
      of this Contract by reference as if fully set forth within this Contract:

             Exhibit A -- Statement of Work

ARTICLE 25.  ORDER OF PRECEDENCE

      In the event of any inconsistency among or between the parts of this
      Contract, such inconsistency shall be resolved by giving precedence in
      the order of the parts as set forth below:

             1.    Contract Articles

             2.    Statement of Work (Exhibit A)





                                       16

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   19
                       MOTOROLA CONFIDENTIAL PROPRIETARY

ARTICLE 26.  DISPUTES AND GOVERNING LAW

      A.     This Contract and any dispute arising under or in connection with
             this Contract, including any action in tort, shall be construed in
             accordance with and governed by the laws of the State of Arizona
             except for its choice of laws rules.

      B.     Motorola and Iridium will attempt to settle all disputes, claims,
             or controversies arising under or in connection with this Contract
             through consultation and negotiation in good faith and a spirit of
             mutual cooperation.  If those attempts fail, the parties agree to
             consider forms of alternative dispute resolution (ADR) such as
             neutral fact-finding, mediation, arbitration, or a minitrial.

      C.     All disputes arising in connection with the interpretation or
             implementation of this Contract which are not resolved in a timely
             manner shall be referred, within Motorola's and Iridium's
             organizations, as follows:

             1.    The dispute shall be referred to the General Manager,
                   Motorola, Satellite Communications Division and Iridium's
                   comparable level executive or their designees for
                   satisfactory resolution.

             2.    If the dispute remains unresolved after ten (10) days have
                   elapsed, it shall be referred to the Chief Executive
                   Officers (CEOs) of Motorola and Iridium or their designees
                   for resolution.

             3.    Except as to intellectual property issue disputes, if the
                   dispute remains unresolved after thirty (30) days have
                   elapsed following referral to the CEOs, it shall then be
                   solely and finally settled by arbitration (or some other
                   form of Alternative Dispute Resolution mutually acceptable
                   to the parties) conducted in the English language in
                   Arizona, in accordance with the Rules of Arbitration of the
                   American Arbitration Association (AAA) by three (3)
                   arbitrators, one of whom shall be selected by Iridium and
                   one of whom shall be selected by Motorola.  After demand for
                   arbitration is made and the demanding party has selected its
                   appointed arbitrator,

                   (a)    the other party shall have twenty (20) calendar days
                          to select its arbitrator,

                   (b)    after such selection, the two party-appointed
                          arbitrators shall have twenty (20) calendar days to
                          appoint a third arbitrator who shall act as chairman,

                   (c)    if the two party-appointed arbitrators do not make
                          such appointment within such time, the AAA shall make
                          such appointment within ten (10) calendar days, and

                   (d)    the arbitral tribunal shall decide the matter and
                          render an award within sixty (60) calendar days
                          thereafter.

                   The parties hereto shall cooperate in such expedited
                   procedure and perform all necessary acts to ensure adherence
                   to this schedule.  The chairman shall be a businessman or
                   lawyer with at least ten (10) years of experience with
                   international business transactions.  The arbitral tribunal
                   shall decide, by majority vote, the





                                       17

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   20
                       MOTOROLA CONFIDENTIAL PROPRIETARY

                   resolution of the dispute, controversy or claim in
                   accordance with the governing law specified in this
                   Contract.  The decision of the arbitrators shall be in
                   writing and shall set forth the bases therefore.  The
                   parties hereto shall abide by all awards rendered in
                   arbitration proceedings, and all such awards may be enforced
                   and executed upon in any court having jurisdiction over the
                   party against whom enforcement of such award is sought.
                   Motorola and Iridium shall divide equally the administrative
                   charges, arbitrator's fees, and related expenses of
                   arbitration but each party shall pay its own legal fees and
                   other expenses incurred in presenting and defending its
                   position on the dispute incurred in connection with any such
                   arbitration.  All arbitration awards hereunder shall be
                   rendered and paid in United States Dollars.

             4.    Any intellectual property issue dispute, which is not
                   resolved by the parties after a good faith attempt at
                   resolution has been made as provided in paragraphs one (1)
                   and two (2) above of this Article may then be submitted to
                   the courts of the State of New York, United States of
                   America, unless mandatorily preempted by Federal Law of the
                   United States of America, whereupon such dispute shall be
                   submitted to the Federal courts of the United States of
                   America.

             5.    The parties acknowledge and agree that the United Nations
                   Convention on Contracts for the International Sale of Goods
                   (the "Vienna Convention") shall not apply to the
                   transactions contemplated by this Contract.

ARTICLE 27.  ENTIRE AGREEMENT

      A.     This Contract constitutes the entire agreement between the parties
             and supersedes all prior understandings, commitments, and
             representations whether written, oral, electronic or otherwise
             with respect to the subject matter contained herein.  This
             Contract may not be amended or modified except as provided by the
             Article herein entitled CHANGES; nor may it be terminated except
             as provided by the Article herein entitled DEFAULT BY MOTOROLA,
             the Article herein entitled TERMINATION FOR CONVENIENCE, or the
             Article herein entitled DEFAULT BY IRIDIUM; and, none of its
             provisions may be waived, except by a writing signed by an
             authorized representative of the party against which the waiver is
             sought to be enforced.  The paragraph headings herein shall not be
             considered in interpreting the text of this Contract.  In the
             event any part of this Contract is declared legally invalid or
             unenforceable by an authorized judicial body, such part of this
             Contract shall be ineffective to the extent of such invalidity or
             unenforceability and shall not affect the remaining provisions of
             this Contract unless such declaration affects the Article herein
             entitled LIMITATION OF LIABILITY.  In such case, this Contract
             shall be declared terminated as of the date of such judicial
             decision and the parties shall have only the following rights and
             responsibilities:

             1.  Motorola's Rights and Responsibilities:

                   (a)    Motorola shall, to the extent that it has the right
                          to do so, deliver to Iridium the then-current version
                          of the Gateway Design Package as of the effective
                          date of





                                       18

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   21
                       MOTOROLA CONFIDENTIAL PROPRIETARY

                          any such termination along with the intellectual
                          property licenses specified in the Article herein
                          entitled INTELLECTUAL PROPERTY RIGHTS.

                   (b)    Motorola shall be paid a percentage of the total
                          price of this contract equal to the actual percentage
                          of completion of the Gateway Design Package that is
                          completed as of the effective date of such
                          termination action.  In no event shall such amount be
                          less than the amount which has been completed as of
                          the date of the signature by the parties to this
                          contract.

                   (c)    Motorola shall be relieved of all other obligations
                          contained in this Contract and any and all liability
                          arising directly or indirectly out of this contract
                          except for its obligation to not use or disclose
                          proprietary information of Iridium except in
                          accordance with the Article herein entitled
                          DISCLOSURE AND USE OF INFORMATION BY THE PARTIES.

             2.  Iridium's Rights and Responsibilities:

                   (a)    Iridium shall, upon payment of the Contract price
                          specified below and to the extent that Motorola has
                          the right to do so, receive the then-current version
                          of the Gateway Design Package as of the effective
                          date of any such termination along with the
                          intellectual property licenses specified in the
                          Article herein entitled INTELLECTUAL PROPERTY RIGHTS.

                   (b)    Iridium shall pay a percentage of the total price of
                          this Contract equal to the actual percentage of
                          completion of the Gateway Design Package that is
                          completed as of the effective date of such
                          termination action.  In no event shall such amount be
                          less than the amount which has been completed as of
                          the date of the signature by the parties to this
                          contract.

                   (c)    Iridium shall be relieved of all other obligations
                          contained in this Contract and any and all liability
                          arising directly or indirectly out of this contract
                          except for its obligation to not use or disclose
                          Motorola's proprietary information except in
                          accordance with the Article herein entitled
                          DISCLOSURE AND USE OF INFORMATION BY THE PARTIES.

      B.     Notwithstanding anything in this Contract to the contrary, the
             rights, representations, and obligations of the Parties as
             expressed in this agreement are made for the benefit of the
             Parties hereto and shall not be interpreted or construed as
             providing any beneficial or legal interest to any third party
             (including without limitation all Gateway Equipment purchasers,)
             nor shall it be construed or interpreted as granting any rights or
             remedies to any third parties under any written or implied
             contract with Motorola (including without limitation all Gateway
             Equipment purchasers,).

ARTICLE 28.  EFFECTIVE DATE

      The term Effective Date of this Contract (EDC), as used in this Contract,
      shall mean the first day of January 1993.





                                       19

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   22
                       MOTOROLA CONFIDENTIAL PROPRIETARY

IN WITNESS WHEREOF, the parties hereto have executed this Contract consisting
of this and the preceding nineteen (19) pages and the Exhibit referenced
therein.



Motorola, Inc.                         Iridium LLC

By:   /s/ BARRY BERTIGER               By:   /s/ JERROLD D. ADAMS             
    -------------------------------        -----------------------------
                                                                              
Name:  Barry Bertiger                  Name:      Jerrold D. Adams            
     ------------------------------         ----------------------------
       Corporate V.P. &                        President & Chief
       General Manager                 Title:  Operating Officer
      -----------------------------          ---------------------------
Date:                                  Date:                                  
     ------------------------------         ----------------------------






                                       20

                       MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   23
                                 THE IRIDIUM(R)
                        TERRESTRIAL NETWORK DEVELOPMENT



                                   EXHIBIT A


                               STATEMENT OF WORK

                 (CONFORMED 1/14/97 TO INCLUDE AMENDMENT NO. 2)


                                    FOREWORD

This document contains the scope of work to be performed by the Satellite
Communications Division (SATCOM) of Motorola, Inc. (Motorola) located in
Chandler, Arizona under the Terrestrial Network Development Contract with
Iridium LLC located in Washington, D.C.  The work in this document includes
the non-recurring engineering design, development and test efforts associated
with the IRIDIUM Gateway Equipment which will be sold by Motorola under
separate contracts with Gateway Operators.




- -------------------

IRIDIUM is registered trademark and service mark of Iridium LLC.





<PAGE>   24
                       MOTOROLA CONFIDENTIAL PROPRIETARY

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
SECTION    TITLE                                                                                                PAGE
- -----------------------------------------------------------------------------------------------------------------------
<S>        <C>                                                                                                   <C>
1.0        BACKGROUND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      1

2.0        SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      2

2.1        ADDITIONAL SCOPE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      2

3.0        TERRESTRIAL NETWORK DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3

3.1        FUNCTIONAL OBJECTIVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3

3.1.1      SERVICE AND FUNCTIONAL CAPABILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      3

3.1.2      GATEWAY EQUIPMENT OPERATIONAL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      5

3.2        GATEWAY EQUIPMENT PERFORMANCE OBJECTIVES  . . . . . . . . . . . . . . . . . . . . . . . . . . . .      5

3.2.1      CALL PROCESSING PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      5

3.2.2      RF AND MODEM PERFORMANCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      6

3.2.3      OA&M PERFORMANCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      7

3.2.4      IRIDIUM BUSINESS SUPPORT SYSTEM INTEGRATION SUPPORT . . . . . . . . . . . . . . . . . . . . . . .      7

3.3        MONITORING DEVELOPMENT PROGRESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      7

3.4        TEST DOCUMENTATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      8

4.0        MILESTONE DESCRIPTIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      9

           TABLE 4.0-1 TNPC MILESTONES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      9

4.1        SUBSYSTEM ACCEPTANCE TESTING (MILESTONES 1 THROUGH 4) . . . . . . . . . . . . . . . . . . . . . .      9

4.1.1      MILESTONE 1 - GATEWAY SWITCHING CENTER SR4 SUBSYSTEM ACCEPTANCE TEST  . . . . . . . . . . . . . .     10

4.1.2      MILESTONE 2 - EARTH TERMINAL CONTROLLER (ETC) SUBSYSTEM ACCEPTANCE TEST . . . . . . . . . . . . .     10

4.1.3      MILESTONE 3 - OMC-G SUBSYSTEM ACCEPTANCE TEST . . . . . . . . . . . . . . . . . . . . . . . . . .     11

4.1.4      MILESTONE 4 - MESSAGING SUBSYSTEM ACCEPTANCE TEST . . . . . . . . . . . . . . . . . . . . . . . .     11

4.2        TNDC DEMONSTRATIONS (MILESTONES 5 THROUGH 8)  . . . . . . . . . . . . . . . . . . . . . . . . . .     12

4.2.1      MILESTONE 5- GATEWAY TEST LAB DEMONSTRATION - Release 1   . . . . . . . . . . . . . . . . . . . .     12

4.2.2      MILESTONE 6 - GATEWAY ACCEPTANCE TEST PROCEDURES - RELEASE 1  . . . . . . . . . . . . . . . . . .

4.2.3      MILESTONE 7 - GATEWAY/SYSTEM DEMONSTRATION - RELEASE 1  . . . . . . . . . . . . . . . . . . . . .     13

4.2.4      MILESTONE 8 - GATEWAY TEST LAB DEMONSTRATION - RELEASE 2  . . . . . . . . . . . . . . . . . . . .     14

4.3        GATEWAY DESIGN PACKAGES (MILESTONES 9 AND 10) . . . . . . . . . . . . . . . . . . . . . . . . . .     15

4.3.1      BSP-G0001.GWS, IRIDIUM GATEWAY SEGMENT SPECIFICATION  . . . . . . . . . . . . . . . . . . . . . .     15

4.3.2      GATEWAY INTERFACE SPECIFICATIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     15

4.3.3      DEVELOPMENT PROCUREMENT PACKAGES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     15
</TABLE>

- ------------------------------



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                       MOTOROLA CONFIDENTIAL PROPRIETARY

<TABLE>
<S>        <C>                                                                                                   <C>
4.3.4      GATEWAY SYSTEM OPERATIONS, ADMINISTRATION AND MAINTENANCE (OA&M) MANUALS  . . . . . . . . . . . .     16

4.3.5      GATEWAY TRAINING MATERIALS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     16

4.3.6      GATEWAY DEVELOPMENT VERIFICATION PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . .     16

4.3.7      GATEWAY PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     16

4.3.8      GATEWAY CUSTOMER ACCEPTANCE TEST PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . .     16

4.3.9      GENERIC GATEWAY FACILITIES DESIGN PACKAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . .     17

5.0        PROGRAM MANAGEMENT OBJECTIVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     18

6.0        PRE-COMMERCIAL SERVICE WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     18

7.0        GTAC SERVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     18

8.0        COMMERCIAL ACTIVATION ACTIVITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     19
</TABLE>





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                       MOTOROLA CONFIDENTIAL PROPRIETARY





                                   APPENDICES


A.       GATEWAY TNDC PERFORMANCE OBJECTIVES



B.       DESCRIPTION OF IRIDIUM SERVICES



C.       DESCRIPTION OF GATEWAY MANAGEMENT FUNCTIONAL AREAS





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

1.0      BACKGROUND

               The Terrestrial Network Development Contract (TNDC) is a
               contract under which Motorola SATCOM will complete the
               development and testing of the detailed design for a specific
               portion (Gateway Equipment) of the IRIDIUM Communications
               System.  It does not include the IRIDIUM Business Support System
               (previously known as the Network Management Support System)
               functionality or equipment.  It is understood that at the date
               of contract award, Gateway Equipment development progress has
               been made in the areas of detailed planning, requirements
               generation and analyses, supplier selection and high level
               design for some areas of functionality.     
               




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                       MOTOROLA CONFIDENTIAL PROPRIETARY

2.0      SCOPE

                    The Terrestrial Network Development (TND) is for a set of
               tasks to specify, design, develop, integrate and test specific
               hardware and software of the IRIDIUM  Gateway Equipment.

               Tasks related to the TND effort include:

               A.  Develop detailed functional, technical and operating
               requirements from higher level requirements as expressed in the
               TND Functional and Performance Objectives, Appendix A, the
               Description of IRIDIUM Services, Appendix B and the OA&M
               capabilities described in Appendix C.

               B.  Develop the design for Gateway Equipment hardware.

               C.  Develop the design for Gateway Equipment software.

               D.  Document the design effort such that the design can be
               reviewed between SATCOM and Iridium, Inc. as work progresses and
               such that the design effort culminates in deliverable
               documentation identified as the Gateway Design Package.

               E.  Develop and test the software of the Gateway Equipment.

               F.  Integrate and test the Gateway Equipment software and
               hardware using a laboratory test environment.  It is expected
               the laboratory environment will be used by Motorola after the
               completion of the TND for support and future development.

               G.  Demonstrate that the Gateway Equipment design meets the
               requirements of the TND Functional and Performance Objectives as
               identified in Appendix A, the Description of IRIDIUM Services
               found in Appendix B and the OA&M capabilities as described in
               Appendix C.

               H.  Deliver the Gateway Design Package to Iridium.

2.1      ADDITIONAL SCOPE RELATING TO COMMERCIAL ACTIVATION ACTIVITIES

               In addition to the tasks set forth in Section 2.0 above,
               Motorola's performance hereunder shall include providing the
               Pre-Commercial Service warranty, providing the GTAC Services,
               performing Technical Trials, providing the Operations Data
               Network





                                       2
<PAGE>   29
                       MOTOROLA CONFIDENTIAL PROPRIETARY

                (ODN), and supporting other activities related to Commercial
               Activation, (e.g., Operational Trial, Gateway Commissioning;
               Subscriber Trials; Implementation, Testing and Activation of 
               Release 3 into the Gateway Equipment).





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<PAGE>   30
                       MOTOROLA CONFIDENTIAL PROPRIETARY

3.0      TERRESTRIAL NETWORK DEVELOPMENT

3.1      FUNCTIONAL OBJECTIVES

               The IRIDIUM Gateway design is based on digital cellular
               technology and relies on the development of electrical
               interfaces and signaling protocols for both fixed established
               equipment and mobile IRIDIUM subscriber equipment.  The Gateway
               Equipment shall be designed to provide functions required for
               the interconnectivity between the IRIDIUM Space System and the
               terrestrial international wireline network through a peer level
               interface with an international transit tandem switch.  The
               Gateway Equipment shall be designed to support interconnection
               to different Public Switched Telephony Networks (PSTN) and
               Integrated Services Digital Networks (ISDN) restricted to
               signaling protocols according to the following:





                                       *





               The IRIDIUM Gateway Equipment shall be designed to provide the
               access control and call processing functionality (including
               collection of usage data to support network management and
               billing) necessary to implement IRIDIUM telephony, bearer and
               messaging services.

3.1.1    SERVICE AND FUNCTIONAL CAPABILITIES

               The IRIDIUM Gateway Equipment shall provide the following
               service and functional capabilities.  A detailed description of
               the services supported by the Gateway Equipment design, to the
               extent the Gateway equipment contributes to effecting such
               services, can be found in Appendix B.




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       4
<PAGE>   31
                       MOTOROLA CONFIDENTIAL PROPRIETARY

*

- - Basic Teleservices

     --  Telephony (call processing, setup, control, tear down)

     --  Emergency Calling 11 (using SIM card and valid subscription)


- -  Basic Telephony Features

     --  Voice Path Cut-Through

     --  Transit Trunking

     --  Supplemental Telephony Features (configurable capabilities)

              --   VLR/HLR Restoration According to GSM Phase II

              --   Intercept (basic)

              --   EIR Node Functionality

              --   Call offering Supplementary Services

                      Call Forwarding Unconditional (CFu)

                      Call Forwarding on Mobile Subscriber Busy
                      (CFb)

                      Call Forwarding on Mobile not reachable (CFNRc)

              --   Call Restriction

- -   Other Services

     --  Support of Debit Card (refer to Appendix B for conditions)

     *   

*
- -   Messaging Services

     --  Directed Messaging Service (DMS)

     --  DMS Features and Supplementary Services




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       5
<PAGE>   32
                       MOTOROLA CONFIDENTIAL PROPRIETARY

     --  DMS Voice Messaging Supplementary Services

- -   Telephony Voice - Messaging

- -   Telephony Voice - Messaging Supplementary Services

*
- -   Bearer Services

     *

     --  Automatic Facsimile (FAX)

     * 

- -   Voice Supplementary Services

     --  Community of Interest (Closed User Group)

     --  Multi-Party

     --  Call Waiting

     --  Call Hold

     --  Call Forwarding No Reply (CFnr)

- -   Supplementary Telephony Services

     --  Attach/Detach

     *

     --  Single IRIDIUM Number (Refer to Appendix B for restrictions)


3.1.2    GATEWAY EQUIPMENT OPERATIONAL FUNCTIONS

         IRIDIUM Gateway operations, administration and maintenance (OA&M)
         functions will be provided in the Gateway Equipment design.  These
         functions will include fault management, configuration management,
         performance management, security management and accounting management.
         In addition, gateway network element level management fucntions will
         be provided for the ETC, switch and messaging sybsystems.  The Gateway
         OA&M equipment will be capable of interfacing with the IRIDIUM
         Business Support System.  Appendix C provides a description of the
         Gateway management functional areas.



- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       6
<PAGE>   33
                       MOTOROLA CONFIDENTIAL PROPRIETARY

3.2      GATEWAY EQUIPMENT PERFORMANCE OBJECTIVES

               The Gateway Equipment performance attributes for Call Processing
               and OA&M are identified in Appendix A.  These attributes
               represent the set of objectives which specify expected
               performance of the Gateway Equipment when operated as an
               integral part of the IRIDIUM Communications System.  The
               performance objectives fall into three categories: Call
               Processing Performance, RF and Modem Performance, and OA&M
               Performance.

3.2.1    CALL PROCESSING PERFORMANCE

               The Gateway Equipment call processing performance attributes and
               their values are identified in Table 1 of Appendix A.

                                       *

                                        Parameters specified represent only the
               IRIDIUM Gateway contribution to the overall system time
               parameters.

               The Gateway Equipment will contain an implementation of a
               proprietary transcoder algorithm.  A data package will be
               provided to Iridium, Inc. as Motorola proprietary data
               containing voice encoder/decoder evaluation results.

3.2.2    RF AND MODEM PERFORMANCE

               To demonstrate the RF and modem characteristics of the Gateway
               equipment, Motorola will provide a data package containing test
               data and results of earth terminal test performed for the Space
               System.  The tests would include:

               -          Ka-band link BER performance
               -          Ka-band link RF power control performance
               -          Satellite acquisition time
               -          SV-SV hand-off performance parameters
               -          Uplink and downlink RF frequency accuracy
               -          Maximum EIRP and EIRP stability
               -          Feeder link data rate





- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       7
<PAGE>   34
                       MOTOROLA CONFIDENTIAL PROPRIETARY

               -          G/T(derived)

               -          Antenna gain patterns for transmit and receive 
                          frequencies.

               Motorola understands that some of this data may be needed to
               obtain licensing of the Gateway in certain countries and,
               therefore, Motorola agrees to minimize the amount of proprietary
               data included in the test reports.

3.2.3    OA&M PERFORMANCE

               The IRIDIUM Gateway Equipment Operations, Administration and
               Maintenance (OA&M) performance parameters and their values are
               identified in Table 2 of Appendix A.


                                       *

3.2.4    IRIDIUM BUSINESS SUPPORT SYSTEM INTEGRATION SUPPORT

               Motorola will support the integration of the Iridium developed
               business system with Gateway equipment in the Gateway test
               laboratory in Chandler, AZ.  Motorola will provide reasonable
               laboratory space and technical support for this activity, as
               well as access to the operational Gateway subsystems.

3.3      MONITORING DEVELOPMENT PROGRESS

               Through planned design reviews and test activities, Iridium,
               Inc. will be able to monitor the TND progress.  Duplication of
               testing for the purposes of satisfying requirements of the TND
               should be avoided.  Iridium, Inc. will be afforded the
               opportunity to attend Gateway Design Reviews and participate in
               TND testing as described below.  The test objectives of the TND
               contract include verification through test and demonstration
               that the IRIDIUM Gateway Equipment design meets the Functional
               Objectives identified in Section 3.1, the Performance Objectives
               outlined in Section 3.2 and as identified in Appendix A, the
               services described in Appendix B and the OA&M capabilities
               listed in Appendix C.  The integrated Gateway Equipment will be
               shown to function as an integral part of the IRIDIUM
               Communication System.  To accomplish the objectives, testing
               will be performed at four levels.  The first testing level is
               subsystem acceptance testing.  This testing will be performed to
               verify that the

- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.




                                       8
<PAGE>   35
                       MOTOROLA CONFIDENTIAL PROPRIETARY

               suppliers have met the subsystem level requirements.  The second
               level of testing is performed at the Gateway Equipment level by
               integrating and testing the subsystems together as a functional
               entity.  This level of testing will be performed to verify that
               the Gateway segment level requirements have been met and all
               interfaces external to the Gateway have been verified.
               Simulation will be used for most external interfaces.  The third
               level of testing demonstrates the Gateway Equipment in the
               Gateway test laboratory.  This level of testing introduces other
               system elements such as the System Control Segment Control
               Facility, the Message Termination Controller, and the ISU, which
               replace simulators in the Gateway test laboratory.  The
               objective of this testing is to integrate the Gateway segment
               into the IRIDIUM Communications System in a laboratory
               environment.  The fourth and final level of testing will be
               performed to demonstrate the integrated Gateway Equipment
               functions in the IRIDIUM Communications System using on-orbit
               satellites as available.
               
                                       *





3.4      TEST DOCUMENTATION

               Test documentation will be developed by both the subsystem
               suppliers and Motorola to describe the applicable test
               processes.  These documents will be made available to Iridium
               for review at least 30 days prior to testing.  Copies of
               test reports will be provided to Iridium, Inc. within 30 days
               following testing.  Test procedure documents will contain
               information which is used to verify or test functional
               capabilities of the Gateway Equipment.  These procedures will
               contain information such as: test requirements specifications,
               system under test scenarios, test plans, stimulus/response,
               verification matrices, etc.  Test acceptance documents will
               contain the test procedures which will be executed.  A pass/fail
               criteria will be developed for the key performance
               specifications.  Iridium, Inc. will be offered the opportunity
               to witness testing.  Test report documents will contain the
               results of the test effort.  TND test efforts will include
               supplier acceptance testing, lab testing, Beta Site
               pre-acceptance testing, or demonstration testing.  The test
               reports will provide information as to the success and status of
               the system under test including an action plan to correct
               deficiencies or defects discovered during testing.
              


- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.








                                       9
<PAGE>   36
                       MOTOROLA CONFIDENTIAL PROPRIETARY

4.0      MILESTONE DESCRIPTIONS

                   The contract milestone schedule is provided in Table 4.0-1.
               These milestones will demonstrate tangible progress toward
               implementation of the IRIDIUM Gateway Equipment design.
               Description of the contract milestones and completion criteria
               are provided below.  Iridium, Inc. shall have the right to
               challenge the assertion of Motorola that any milestone has been
               completed in accordance with the stated criteria pursuant to
               Article 6, PAYMENT, Subsection D.

TABLE 4.0-1. TNDC MILESTONES

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
   MS                         DESCRIPTION                            SCHEDULED         AMOUNT DUE   
   NO.                                                           COMPLETION DATE**    (U.S. DOLLARS)
- --------------------------------------------------------------------------------------------------------
   <S>    <C>                                                         <C>          <C>
    1     GSC SR4 Acceptance Test                                        *                    *         
- --------------------------------------------------------------------------------------------------------
    2      Gateway ETC Basic Teleservices Acceptance Test                *                    *         
- --------------------------------------------------------------------------------------------------------
    3      Gateway OMC-G Acceptance Test                                 *                    *         
- --------------------------------------------------------------------------------------------------------
    4      Gateway Messaging Subsystem Acceptance Test                   *                    *         
- --------------------------------------------------------------------------------------------------------
    5      Gateway Test Lab Demonstration Release *                      *                    *         
- --------------------------------------------------------------------------------------------------------
    6      Gateway Acceptance Test Procedures Release *                  *                    *         
- --------------------------------------------------------------------------------------------------------
    7      Gateway/System Demonstration Release *                        *                    *         
- --------------------------------------------------------------------------------------------------------
    8      Gateway Test Lab Demonstration Release *                      *                    *         
- --------------------------------------------------------------------------------------------------------
    9      Gateway Design Package Release *                              *                    *         
- --------------------------------------------------------------------------------------------------------
   10      Gateway Design Package Release *                              *                    *         
- --------------------------------------------------------------------------------------------------------
          TOTAL                                                                    $160,000,000
- --------------------------------------------------------------------------------------------------------
          **The dates shown in the column titles "Scheduled
          Completion Date" are those selected dates as of the
          effective date of the TNDC and are subject to
          adjustment as provided by ARTICLE 18, Excusable
          Delays, of the Contract.
- --------------------------------------------------------------------------------------------------------
</TABLE>






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     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       10
<PAGE>   37
                       MOTOROLA CONFIDENTIAL PROPRIETARY


4.1      SUBSYSTEM ACCEPTANCE TESTING (MILESTONES 1 Through 4)

                     Subsystem acceptance testing will be conducted with the
               Motorola suppliers in accordance with Motorola approved
               acceptance test procedures.  In general, the acceptance testing
               will occur at the subsystem supplier facility.  Successful
               completion will be based on completion of the test procedures
               and establishment of an action plan to correct any deficiencies
               and defects detected during testing.  The four subsystem
               acceptance tests to be performed include the Earth Terminal
               Controller (ETC), the Gateway Switching Center (GSC), the
               Gateway Messaging System (GWMS) and the Operations and
               Maintenance Center (OMC-G).  The locations of the testing are
               tentative and are subject to change to accommodate changes in
               Motorola's development plans.  Acceptance test procedures (ATP)
               for each of the subsystem acceptance tests will be provided to
               Iridium Inc. for review and comment no less than thirty (30)
               days prior to the start of testing.

4.1.1    MILESTONE 1- GATEWAY SWITCHING CENTER SR4 SUBSYSTEM ACCEPTANCE TEST

                     Subsystem acceptance testing will be performed by the GSC
               supplier.  The acceptance testing is planned to be performed at
               the SATCOM facility in Chandler, Arizona.

                                       *

                                        Siemens will test the Gateway Switching
               Center SR4 release to ensure compliance with the Motorola
               developed procurement specifications. This testing will be
               related to Release * functionality. Acceptance criteria will be 
               defined in the ATP.  Acceptance test procedures will be provided 
               by Siemens and approved by Motorola. The acceptance test 
               procedures will be provided to Iridium, Inc. for review prior 
               to testing.

               COMPLETION CRITERIA

               The milestone shall be deemed complete when GSC SR4 has been
               tested to the satisfaction of Motorola and a corrective action
               plan has been established for those items found to be
               non-compliant with the ATP acceptance criteria.  Iridium, Inc.
               representatives shall be offered the opportunity to witness the
               subsystem acceptance testing.




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       11
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                       MOTOROLA CONFIDENTIAL PROPRIETARY

4.1.2    MILESTONE 2 - EARTH TERMINAL CONTROLLER (ETC) SUBSYSTEM ACCEPTANCE
TEST

                       The ETC subsystem acceptance test is scheduled to be
               performed at the Motorola Scottsdale facility

                                       *
                                                 This acceptance testing 
               will include previously accepted transmission (ETS),
               communications (ECS) and management (OMC-R) subsystems.
               Motorola will integrate the three subsystems and perform an ETC
               level acceptance test.  Motorola will test the Gateway Earth
               Terminal Controller subsystem to ensure compliance with the
               Motorola developed specifications.  Acceptance criteria will be
               defined in the ATP.  The acceptance test procedures will be
               provided to Iridium, Inc. for review prior to testing.

               COMPLETION CRITERIA

               The milestone shall be deemed complete when the Gateway ETC has
               been tested to the satisfaction of Motorola and a corrective
               action plan has been established for those items found to be
               non-compliant with the ATP acceptance criteria.  Iridium, Inc.
               representatives shall be offered the opportunity to witness the
               subsystem acceptance testing.

4.1.3    MILESTONE 3 - OMC-G SUBSYSTEM ACCEPTANCE TEST  Subsystem acceptance
               testing will be performed by the OMC-G supplier to *. This 
               milestone is scheduled to be performed at the SATCOM facility 
               in Chandler, Arizona.  Telespazio will test the Gateway 
               Operation and Maintenance Center subsystem to ensure compliance 
               with the Motorola developed procurement specifications.   
               Acceptance criteria will be defined in the ATP.  The acceptance 
               test procedures will be developed by the supplier and approved by
               Motorola.  The acceptance test procedures will be provided to
               Iridium, Inc. for review prior to testing.

               COMPLETION CRITERIA

               The milestone shall be deemed complete when the OMC-G has been
               tested to the satisfaction of Motorola and a corrective action
               plan has been established for those




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       12
<PAGE>   39
                       MOTOROLA CONFIDENTIAL PROPRIETARY

               items found to be non-compliant with the ATP acceptance
               criteria.  Iridium, Inc. representatives shall be offered the
               opportunity to witness the subsystem acceptance testing.

4.1.4    MILESTONE 4 - MESSAGING SUBSYSTEM ACCEPTANCE TEST

                          Subsystem acceptance testing will be performed by
               Motorola using equipment from the Gateway Messaging Subsystem
               (GWMS) and SCS Messaging Subsystem (SCSMS) suppliers.  The GWMS
               Message Origination Controller (MOC) and the SCSMS Message
               Termination Controller (MTC) subsystems will be integrated and
               tested as a messaging infrastructure.  The testing will be
               performed at the Chandler facility.  Motorola will test the
               integrated messaging subsystems in accordance with the Motorola
               acceptance test procedures.  The subsystems include the MOC and
               the MTC.  *.  The acceptance test procedures will be developed by
               Motorola.  Acceptance criteria will be  defined in the ATP.  The
               acceptance test procedures will be  provided to Iridium, Inc.
               for review prior to testing.

               COMPLETION CRITERIA

               The milestone shall be deemed complete when the integrated GWMS
               MOC and SCSMS MTC have  been tested to the satisfaction of
               Motorola and a corrective action plan has been established for
               those items found to be non-compliant with the ATP acceptance
               criteria.  Iridium, Inc. representatives shall be offered the
               opportunity to witness the subsystem acceptance testing.

4.2      TNDC DEMONSTRATIONS (MILESTONES 5 THOUGH 8)

               Motorola will conduct     *     activities to fully demonstrate
               the IRIDIUM Gateway Equipment design meets the Functional
               Objectives of Section 3.1, the Performance Objectives of Section
               3.2 and Appendix A, and supports both the Appendix B services as
               well as the OA&M capabilities described in Appendix C.  The
               demonstrations include verification of Release * functionality
               at the Gateway level in the Gateway test laboratory, in the
               IRIDIUM Communications System using on-orbit assets as
               available, and through successful execution of the
               Release * Acceptance Test Procedures developed for the Gateway
               purchaser's Gateway acceptance.  *




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       13
<PAGE>   40
                       MOTOROLA CONFIDENTIAL PROPRIETARY

                                      *
                                        The TNDC demonstration plan for each
               demonstration milestone will be provided to Iridium, Inc. thirty
               (30) days prior to commencement of the first demonstration test.
               A demonstration test report will be provided to Iridium, Inc.
               within thirty (30) days following the completion of each test.

4.2.1    MILESTONE 5 - GATEWAY TEST LAB DEMONSTRATION - RELEASE *

               The demonstration verifies Release * functionality in
               the Gateway test laboratory.  For this demonstration, the
               Gateway test laboratory will include

                                       *



               COMPLETION CRITERIA

               The milestone shall be deemed satisfactorily completed when the
               integrated Gateway Equipment hardware and software designs have
               been tested in accordance with the mutually agreed plan to
               demonstrate they meet the Release * performance objectives of
               Section 3.2 and Appendix A, the services as described in
               Appendix B, and the OA&M capabilities described in Appendix C
               with no service-affecting non-compliance.  Classification of
               non-compliance categories will be mutually agreed and documented
               in the demonstration plan.  Demonstration may be accomplished by
               testing, simulation or analysis as mutually agreed.  Motorola
               will promptly provide a plant to correct any non-compliance
               including a mutually acceptable scheduled retesting to
               demonstrate correction.  Iridium, Inc.  representatives shall be
               offered the opportunity to witness all demonstration activities.

4.2.2    MILESTONE 6 - GATEWAY ACCEPTANCE TEST PROCEDURES - RELEASE *

               The Gateway Acceptance Test Procedures will be developed as a
               generic set of procedures in accordance with the Gateway
               Acceptance Test Plan (Gateway Purchase Agreement Exhibit C)
               for Release * functionality.  The Gateway Acceptance Test 
               Procedures, in conjunction with referenced OA&M documentation, 
               define the tests




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       14
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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               that will be conducted, the pass/fail criteria, the test
               conditions, and the Method of Procedure for implementation of
               each release.  Motorola will deliver the Acceptance Test
               Procedures for each release to Iridium, Inc. four months prior
               to acceptance testing for review and approval.  The Release *
               Gateway Acceptance Test Procedures will be demonstrated in the
               SATCOM Gateway test laboratory.  The generic test procedures,
               which are expected to be common for all gateway equipment sites,
               will be tailored for the Gateway test laboratory environment.
               The test environment will include

                                       *


               COMPLETION CRITERIA

               The milestone shall be deemed satisfactorily completed when the
               mutually-agreed set of Release * Acceptance Test
               Procedures have been successfully performed on the operational
               Gateway Equipment hardware and software in the Gateway test
               laboratory.  Classification of non-compliance categories will be
               mutually agreed and documented in the demonstration plan.
               Demonstration may be accomplished by testing, simulation or
               analysis as mutually agreed.  Motorola will promptly provide a
               plan to correct any non-compliance including a mutually
               acceptable scheduled retesting to demonstrate correction.
               Iridium, Inc. representatives shall be offered the opportunity
               to witness all demonstration activities.

4.2.3    MILESTONE 7 - GATEWAY / SYSTEM DEMONSTRATION - RELEASE *

                     This demonstration verifies Release * functionality 
               of a set of Gateways integrated into the IRIDIUM system.  
               The test environment will include

                                       *

                                  The Gateway test laboratory will be
               configured to support multiple-Gateway test scenarios using
               operational equipment.  The BETA site gateway will also be used
               in conjunction with the Gateway test laboratory to demonstrate
               multiple-gateway test scenarios and inter-gateway
               communications.




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       15
<PAGE>   42
                       MOTOROLA CONFIDENTIAL PROPRIETARY


               COMPLETION CRITERIA

               The milestone shall be deemed satisfactorily completed when the
               Gateway Equipment hardware and software designs have been
               integrated and tested in the System test environment in
               accordance with the mutually agreed plan to demonstrate they
               meet the Release * performance objectives of Section 3.2
               and Appendix A, the services as described in Appendix B, and the
               OA&M capabilities described in Appendix C with no
               service-affecting non-compliance.  Classification of
               non-compliance categories will be mutually agreed and documented
               in the demonstration plan.  Demonstration may be accomplished by
               testing, simulation or analysis as mutually agreed.  Motorola
               will promptly provide a plan to correct any non-compliance
               including a mutually acceptable scheduled retesting to
               demonstrate correction.  Iridium, Inc. representatives shall be
               offered the opportunity to witness all demonstration activities.

4.2.4    MILESTONE 8 - GATEWAY TEST LAB DEMONSTRATION - RELEASE *

                     The demonstration verifies Release * functionality in the 
               Gateway test laboratory.  For this demonstration, the Gateway 
               test laboratory will include



                                       *



               COMPLETION CRITERIA

               The milestone shall be deemed satisfactorily completed when the
               integrated Gateway Equipment hardware and software designs have
               been tested in accordance with the mutually agreed plan to
               demonstrate they meet the Release * performance objectives of
               Section 3.2 and Appendix A, the services as described in
               Appendix B, and the OA&M capabilities described in Appendix C
               with no service-affecting non-compliance.  Classification of
               non-compliance categories will be mutually agreed and documented
               in the demonstration plan.  Demonstration may be accomplished by
               testing, simulation or analysis as mutually agreed.  Motorola
               will promptly provide a plan to correct any non-compliance
               including a mutually acceptable scheduled retesting to





- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       16
<PAGE>   43
                       MOTOROLA CONFIDENTIAL PROPRIETARY

               demonstrate correction.  Iridium, Inc. representatives shall be
               offered the opportunity to witness all demonstration activities.

4.3      GATEWAY DESIGN PACKAGES (MILESTONES 9 AND 10)

               The contents of the Gateway Design Packages are listed below.
               Three (3) copies of the documentation package will be provided
               in Motorola's or its supplier's format.  Incremental deliveries
               of the information and data packages may be made as they become
               available.  Many documents may be marked with EAR or ITAR
               restrictions to which Iridium, Inc. will be responsible for
               adherence.

               A.  Milestone 9: The first submittal of the design package will
               contain information associated with Release * services as 
               identified in Appendix B and the OA&M capabilities described in 
               Appendix C.

               B.  Milestone 10: The second and final submittal of the design
               package will contain information associated with Release *
               services as identified in Appendix B, the OA&M capabilities 
               described in Appendix C, and any update to the Release * 
               package as required.

               COMPLETION CRITERIA

               These milestones will be deemed complete upon delivery of the
               then-existing versions as of the scheduled completion dates
               identified in Table 4.0-1 of the following nine (9) specific
               documentation packages to Iridium, Inc.

4.3.1    BSP-G0001.GWS, IRIDIUM GATEWAY SEGMENT SPECIFICATION

This document as developed by Motorola defines the requirements and
specifications for allocation to the subsystem elements. The package will
include design specifications for the IRIDIUM Gateway Segment.  Specifically
the document will contain: Gateway segment description, segment functional
requirements, design and construction requirements, documentation requirements,
logistics requirements, personnel and training requirements, subordinate
element characteristics and quality assurance.




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

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                       MOTOROLA CONFIDENTIAL PROPRIETARY

4.3.2    GATEWAY INTERFACE SPECIFICATIONS

                          This document as developed by Motorola contains the
               specifications for the interfaces between the Gateway Segment
               and external systems excluding the interface with the space
               vehicle which is provided under the Space Contract.

4.3.3    DEVELOPMENT PROCUREMENT PACKAGES

               Motorola's request-for-proposal (RFP) packages that were
               developed for the ETC, GSC, OMC and Messaging subsystems will be
               provided.  These packages typically will include proposal
               instructions, statements of work, specifications, and schedule
               requirements.  RFP amendments, if any, will also be provided.

4.3.4    GATEWAY SYSTEM OPERATIONS, ADMINISTRATION AND MAINTENANCE (OA&M)
         MANUALS

               The OA&M manuals (developed by Motorola and Subsystem Vendors)
               will describe the overall characteristics of the Gateway
               Equipment, functionality and OA&M procedures.  The subsystem
               manuals will be modified to include the specific functionality
               added for the IRIDIUM System.  Manuals will be delivered for the
               following subsystems: OMC-G, OMC-R, MOC (Release * only)
               GSC, ETS, ECS, ET.  All of the detailed procedures required for
               system operation will be provided including, but not limited, to
               the following:

               --    Gateway/subsystem startup and shutdown
               --    Gateway routine operations (daily, weekly, monthly, yearly)
               --    System configuration and reconfiguration
               --    System performance monitoring
               --    Fault isolation routines and maintenance assistance
               --    Description of system alarms
               --    Gateway/subsystem equipment installation




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                       18
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                       MOTOROLA CONFIDENTIAL PROPRIETARY

4.3.5    GATEWAY TRAINING MATERIALS

               These materials developed by Motorola contain IRIDIUM-unique
               training materials including curriculum and courses of
               instruction.  Supplier training material will be provided for
               reference to augment the Motorola training materials.

4.3.6    GATEWAY DEVELOPMENT VERIFICATION PROCEDURES

               A set of Motorola developed test procedures will be provided to
               verify each functional incremental software build.  These
               procedures will be derived from the segment level verification
               matrices associated with each software build.  The verification
               matrices will be developed from the IRIDIUM Gateway Segment
               Specification (B0).

4.3.7    GATEWAY PRODUCT DESCRIPTION

               A definitive Gateway product description will be provided.  This
               document will contain baseline configuration data, subscriber
               services, PSTN interconnection, OA&M description, facility
               considerations, subsystem descriptions and capacity and growth
               planning.

4.3.8    GATEWAY CUSTOMER ACCEPTANCE TEST PROCEDURES

               This document will include the generic test procedures to be
               used for acceptance testing of a deployed Gateway.  The
               procedures will be developed in accordance with the baseline
               Gateway Acceptance Test Plan of the Gateway Equipment Purchase
               Agreement.

4.3.9    GENERIC GATEWAY FACILITIES DESIGN PACKAGE

                     The generic Gateway facilities design is a conceptual
               engineering design of the central Gateway facility, the earth
               terminal facilities, and infrastructure within the direct site
               boundary.  The package will include general layouts and
               arrangement of facilities, multi-discipline engineering drawings
               with some details, generic design criteria utilized for the
               design, multi-disciplined calculations (partial), a
               materials/equipment list, major





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               engineering specifications and selected data supporting certain
               parametric studies conducted by Motorola.  The generic Gateway
               Facilities Design package will be made available in accordance
               with the schedule in the baseline Gateway purchase agreement.





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

5.0      PROGRAM MANAGEMENT OBJECTIVES

                     Motorola shall assign a program manager to ensure
               execution plans are developed and performed in compliance with
               the terms of the TND contract.  The program manager shall be the
               interface between the TND team and Iridium, Inc. on program
               performance matters.  The program manager shall also be
               responsible for managing and monitoring the effort so that all
               TNDC requirements are fulfilled, that milestones are met,
               deliveries are made as scheduled, and program risks are
               identified and managed.  The Motorola contract manager shall be
               the primary point-of-contact as regards all contract matters.
               Motorola shall provide engineering management so that all
               technical requirements and specifications are adequately
               identified and implemented using sound engineering
               methodologies.

6.0      PRE-COMMERCIAL SERVICE WARRANTY

                     The Pre-Commercial Service Warranty shall commence, with
               regard to Gateway Equipment, on the date such Gateway Equipment
               has successfully achieved Conditional Acceptance pursuant to the
               GEPA under which such Gateway Equipment was sold and shall
               terminate as of the start of the warranty period for such
               Gateway Equipment.  The scope of the Pre-Commercial Service
               Warranty shall be scope of the "Pre-Commercial Service Warranty"
               as such is described in the GEPA under which such Gateway
               Equipment was sold.

7.0      GTAC SERVICES

                     The GTAC Services are comprised of the following
               telephonic support activities (as used herein, the term Gateway
               Operators refers to purchasers of Gateway Equipment as that term
               is defined in this Contract):

               A.    The Motorola provided Gateway Technical Assistance Center
               ("GTAC") will be available to provide Iridium and Gateway
               Operators with telephone-based technical consultation 7 days per
               week, 24 hours per day.  The GTAC staff will follow Motorola
               established procedures for problem logging, reporting, tracking,
               escalation, and closure.  All calls and written or electronic
               correspondence will be transacted in the English language.
               Iridium and Gateway Operators will individually pay telephone





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               charges for their calls to the GTAC.  Motorola will pay
               telephone charges for its calls to the Gateway Operators and
               Iridium.

               B.    The GTAC staff will operate in real-time to aid Iridium
               and the Gateway Operators in problem isolation and
               troubleshooting.  In addition to the consultation the GTAC staff
               provides, certain remote dial-in diagnostics may also be
               performed on the Gateway with the Gateway Operator's permission.
               The GTAC staff will work on problems based on their designated
               priority level.  Work on a previously reported problem may
               therefore be temporarily suspended if Iridium or another Gateway
               Operator requests assistance with a higher priority problem.

               C.    Problems which cannot be directly resolved by the GTAC
               staff will be referred to Motorola gateway support engineers who
               shall have access to lab facilities as required to diagnose
               problems.  Motorola will arrange for telephone consultation
               service and on-call support engineering assistance at each of
               the Subsystem Suppliers.  Handling of problems escalated in this
               manner will also be governed by the designated priority levels.

               D.    Problems reported through the GTAC will be tracked,
               compiled, and analyzed in terms of trend analysis and quality
               metrics tracking.  Apparent patterns will trigger an in-depth
               investigation intended to result in preventive actions
               recommended for all applicable Gateways in the System.  Iridium
               may review the reports on problems and results of trend analyses
               and quality metrics.

               E.    The GTAC staff will also provide assistance to Gateway
               Operators during the Gateway Equipment purchaser-performed
               installation of new Software releases.  This assistance will
               include the designation of loading, testing, verification and
               back-out procedures, as well as the coordination for timely
               installation of the Software across all Gateways in the System.

8.0      SUPPORT OF COMMERCIAL ACTIVATION ACTIVITIES

               A.    The following items shall constitute the Commercial
               Activation Activities for purposes of the paragraphs in this
               Section 8.0:





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                       MOTOROLA CONFIDENTIAL PROPRIETARY



                     1.   Technical Trials
                     2.   Operational Trial
                     3.   Gateway Commissioning
                     4.   Subscriber Trials
                     5.   Implementation, Testing, and Activation of Release 3 
                          into the Gateway Equipment.
                     6.   Operations Data Network (ODN)

               B.    Iridium and Motorola have established a joint plan to
               facilitate successful commercial activation of the IRIDIUM
               Communications System.  These plans will continue to be reviewed
               on a periodic (generally, at least monthly) basis including
               without limitation at the following meetings:

                     1.   Periodic Iridium/Motorola technical staff reviews.

                     2.   IRIDIUM Commercial Activation Review (ICAR): the
               jointly attended meeting that focuses on the status of Iridium's
               activities respecting the Commercial Activation Activities.

                     3.   Joint monthly Commercial Activation Review: the
               jointly attended meeting that focuses on the status of joint
               activities in support of the optimized commercial activation
               program.

               Iridium shall have the opportunity to review and comment on the
               test plans, procedures and other documentation developed by
               Motorola, and on Motorola's performance, under this Section 8.0.

               C.    Technical Trials

               Motorola shall conduct the Technical Trials to assess the
               functional and performance capabilities of the IRIDIUM
               Communications System in operational environments.

               1.    Motorola shall establish a Technical Trials test plan as
               an extension of Motorola's SI&T program to assess the functional
               and performance capabilities of the IRIDIUM Communications
               System in multiple, international operational environments.
               Except to the extent determined by Motorola to be unreasonable
               or inappropriate after consultation with Iridium, the Technical
               Trials are expected to include testing of: the quality of
               service provided to the end user; the IBSS; external interfaces
               to the IRIDIUM System;





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               Release * Services in an operational configuration with
               subscriber equipment in selected environments (e.g., rural,
               suburban, urban, dense urban, and in vehicle); and, some Release
               * Services.  Iridium will be afforded commercially reasonable 
               opportunity to review and comment on this test plan during the 
               meetings referenced in paragraph 8.0 B above.

               2.    The test environment for the technical trials tests is
               currently planned to include two operational Gateways (subject
               to availability and approval from such Gateway Operators), the
               SCS, the Constellation (to the extent available), pre-commercial
               ISUs, the IBSS, the Operations Data Network, a PSTN, and special
               test equipment as required.  Iridium shall provide and obtain
               all approvals and access for all property and equipment for the
               test environment other than the pre-commercial ISUs, the ODN and
               the special test equipment to be obtained by Motorola.

               3.    Upon completion of the Technical Trials Motorola shall
               provide a test report to Iridium covering results of the
               Technical Trials tests.  The report shall include recommended
               actions to address adverse performance characteristics which
               affect the readiness of the System for Commercial Activation.

               D.    Operational Trial

               The purpose of the Operational Trial is for Iridium to test and
               verify, at a system level, that the IRIDIUM Communications
               System's technology environment, operational processes,
               procedures and personnel are ready to support commercial
               activation and subsequent operation of the IRIDIUM System.  The
               Operational Trial is currently planned to include all
               operational network and business entities, including the SCS,
               GTAC, Iridium, Gateway Operators and Service Providers.  It is
               expected to test end-to-end operational processes of the ITU
               defined Telecommunications Managed Network (TMN) model,
               including business, service, network and element management, the
               Operational Support Systems operation and usability to support
               operational work flow processes (IBSS and network OSS), and
               operational interfaces (network and business) between the SCS,
               GTAC, Gateways, Service Providers and Iridium.  Since the flow
               of operations data is via the ODN, and Services Testing is not
               an objective of the Operational Trial, the Constellation shall
               be minimally used during this activity.  The Operational Trial
               currently intends to use the first five (5) Gateways; subsequent
               Gateways are not currently intended to be a part of the
               Operational Trial.  Motorola shall support the Operational Trial
               in accordance with paragraph F below with


- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.



                                       24
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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               the SCS and GTAC resources determined to be appropriate during
               the Joint Monthly Commercial Activation Review as referenced in
               8.0 B.3. above.  The support by Motorola shall end on the
               Commercial Activation Date.  Iridium will be afforded the
               opportunity to review Motorola's performance related to this
               activity at the meetings referenced in paragraph 8.0 B above.

               E.    Gateway Commissioning 

               The purpose of Gateway Commissioning is for Iridium to certify
               that the Gateway and its operations personnel are ready to be
               added to the Iridium communications network as an operational
               node.  For the gateways which participate in the operational
               trial, commissioning is accomplished as a result of the
               operational trials.  For subsequent Gateways, an abbreviated
               test of processes and procedures, and a verification of final
               configuration, shall be performed to certify operational
               readiness.  Motorola shall support the Gateway Commissioning in
               accordance with paragraph F below with the SCS and GTAC
               resources determined to be appropriate during the joint monthly
               commercial activation review as referenced in 8.0 B.3. above.
               The support by Motorola shall end on the commercial activation
               date.  The support by Motorola under this subparagraph shall end
               on the commercial activation date.  Iridium will be afforded the
               opportunity to review Motorola's performance related to this
               activity at the meetings referenced in paragraph 8.0 B above.

               F.    Support of Operational Trial and Gateway Commissioning

               The SCS and the GTAC shall commence support for operations
               trials and Gateway Commissioning on or about April 1, 1998.  The
               SCS support shall continue until release  *  services are
               commissioned on all Gateways.  The GTAC support, as defined in
               Section 7.0 above, shall terminate on the earlier of September
               23, 1998 or the first date of the commencement of the Gateway
               Performance Assurance Plan ("GPAP") under a GEPA.

               The SCS and GTAC support for the operational trial and Gateway
               Commissioning shall include assisting in the planning and
               definition of the operational trial and Gateway Commissioning
               activities, assisting in the development of the associated
               schedules, processes, procedures and scripts, prior to the start
               of the operations trial, and operational trial team
               participation during execution of the trial scripts.  The SCS
               and GW development organizations shall have technical support
               personnel available to


- -------------------------------

    *    Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.


                                       25
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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               assist the SCS and GTAC operational entities in resolving
               problems in a timely fashion which may impact the trial
               activities.

               The SCS shall be staffed 24 hours a day, 7 days a week during
               the Operational Trial and Gateway Commissioning periods, and
               have personnel available to execute the required processes and
               procedures based upon pre-agreed scripts.  The SCS shall assist
               in evaluating the effectiveness of the processes and procedures,
               and make modifications to procedures developed by Motorola as
               required.

               The SCS facilities and ODN shall be managed during the
               Operations Trials and Gateway Commissioning using normal
               production status configuration control and fault management
               processes.  The Constellation is not required to be managed in a
               production status during the Operations Trails.

               G.    Subscriber Trials

               The purpose of the Subscriber Trials is for Iridium to exercise
               product and serve distribution channels and customer service
               processes to ensure their readiness for rapid ramp-up at
               commencement of full commercial operation.  These trials are
               currently planned to verify that customer experiences with
               subscriber units and services in real life environments and
               conditions are consistent with the technical/operational
               capabilities of the system as encountered in the Technical and
               Operational Trials.  Marketing characterizations of
               product/service features and performance are also intended to be
               verified during these trials.  Subscriber trials are a "dress
               rehearsal" which shall allow introduction of IRIDIUM services to
               potential users prior to full commercial operation.  Subscriber
               Trials are intended to be conducted globally with all market
               segments represented.  Motorola shall support the Subscriber
               Trials with the SCS and GTAC resources determined to be
               appropriate during the Joint Monthly Commercial Activation
               Review as referenced in 8.0 B.3. above.  The support by Motorola
               shall end on the Commercial Activation Date.  The support by
               Motorola under this paragraph shall end on the Commercial
               Activation Date.  Iridium will be afforded the opportunity to
               review Motorola's performance related to this activity at the
               meetings referenced in paragraph 8.0 B above.





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               H.    Implementation, Testing and Activation of Release * into
               the Gateway Equipment

               Motorola shall, except to the extent determined by Motorola to
               be commercially unreasonable after consultation with Iridium,
               support Iridium's implementation (planning, loading and
               configuration), testing, and activation of Release * for the
               "First Office Application, Soak and Roll-Out" to all other
               Gateways by assisting Iridium in its planning and definition of
               Release * implementation, verification and activation; including
               the development of associated schedules, processes, procedures
               (including verification and back-out) and scripts.  Motorola
               shall, except to the extent determined by Motorola to be
               commercially unreasonable after consultation with Iridium, make
               the GTAC available to Iridium for Release * issues on the same
               terms and conditions as in Section 7.0 above.  In addition,
               Motorola shall, except to the extent determined by Motorola to
               be commercially unreasonable after consultation with Iridium,
               provide both on-site and in-plant support of Iridium's Release *
               efforts by supporting planning, procedure development, and
               execution activities related to loading, configuring, and
               testing Release * software in the Gateway Equipment components,
               including the ETC, ECS, SSS, OMC-G, OMC-R and Messaging.  The
               support to be provided by Motorola under this subparagraph shall
               end upon the earlier of June 1, 1999 or the date that Release *
               is commissioned in the last Gateway Equipment (see definition of
               Gateway Equipment).  Iridium will be afforded the opportunity to
               review Motorola's performance related to this activity at the
               meetings referenced in paragraph 8.0 B above.

               I.    Operations Data Network (ODN)

               (1)   ODN Connectivity:

               Motorola shall provide and manage the Operations Data Network
               (ODN), a frame relay network separate from the Space System and
               the Constellation, which links the Gateways and the MCF, and
               provides backup links to the BCF, or to other backup sites at
               which the Network Management Function and the redundant MTC may
               be located.  The ODN shall include links and capacity as
               designated by Iridium LLC for IBSS requirements, including
               connectivity of remotely located GBS installations.
               Availability of the ODN shall be consistent with the
               requirements for reliable delivery of the traffic carried, and
               Motorola and Iridium shall periodically review ODN performance
               data and make adjustments, if required, as mutually agreed.


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     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.



                                       27
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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               (2)   ODN Capacity, Traffic Allocation and Cost Allocation

               Initial Capacity:

               Initially, Motorola shall provide a * link between the
               frame relay network and each gateway and a * link between
               the frame relay network and the MCF.  Sizing of the link to the
               BCF, or to other backup sites at which the Network Management
               Function and the redundant MTC may be located shall be
               sufficient to accommodate the equivalent traffic as would be
               carried by the link to the MCF.  In addition, Motorola shall
               provide links to remotely located GBS sites, as designated by
               Iridium LLC.  Such remote site designations and the initial
               capacity of each link shall be communicated to Motorola by
               Iridium LLC by a mutually agreeable date consistent with the
               Commercial Activation schedule.

               Anticipated Traffic

               Traffic (data) to be transported by the ODN includes:

               -Motorola responsible network management data between the MCF
               and the Gateways and message delivery requests from the MOC to
               the MTC.

               -Iridium LLC responsible Call Detail Record traffic among GBS
               (whether colocated with the gateway or remotely located),
               Gateway and IBS (whether colocated with MCF or remotely
               located).

               Motorola shall provide network management capabilities to
               monitor and measure the various traffic types at the Control
               Facilities and Gateways.  This data will be shared between
               Motorola and Iridium LLC in order to jointly plan network
               capacity allocations and adjustments.

               Cost Allocation:

               Motorola shall procure and manage the configuration, operation
               and maintenance of the entire ODN.  Iridium LLC will reimburse
               Motorola for the following costs:

               -Non-recurring installation charges and recurring operating
               costs for links with GBS installations remote from the Gateways
               and IBS installations remote from the MCF.

- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.





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                       MOTOROLA CONFIDENTIAL PROPRIETARY

               -Non-recurring installation charges and recurring operating
               costs for the IBSS traffic and associated links beyond the cost
               of the initially installed capacity as described above.

               Each party has first rights to capacity it acquires for its
               respective traffic.  To the extent spare link capacity exists,
               Motorola and Iridium mutually agree to share such spare capacity
               in order to achieve more efficient use by both parties of
               installed capacity and to minimize unnecessary expansion costs
               by either party.





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                       MOTOROLA CONFIDENTIAL PROPRIETARY





                                   APPENDIX A


                      GATEWAY TNDC PERFORMANCE OBJECTIVES


                                 JULY 13, 1995





<PAGE>   57




                                       *




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     *   Information has been omitted and filed separately with the Commission
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                                      A-i
                       MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   58




                                       *








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         pursuant to Rule 406 of the Securities Act of 1933.


                                     A-1
                      MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   59

                                       *




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     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-2
                      MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   60





                                       *




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         pursuant to Rule 406 of the Securities Act of 1933.
 
                                     A-3
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<PAGE>   61




                                       *





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         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-4
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<PAGE>   62




                                       *




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     *   Information has been omitted and filed separately with the Commission
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                                     A-5
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<PAGE>   63





                                       *




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-6
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                                       *




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-7
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                                       *




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-8
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                                       *




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-9
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                                      *



- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-10
                      MOTOROLA CONFIDENTIAL PROPRIETARY

<PAGE>   68





                                       *




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                     A-11
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                       MOTOROLA CONFIDENTIAL PROPRIETARY

                                      *


- ---------------
  * Information has been omitted and filed separately with the Commission
    pursuant to Rule 406 of the Securities Act of 1933.


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                       MOTOROLA CONFIDENTIAL PROPRIETARY

                                 THE IRIDIUM(R)
                    TERRESTRIAL NETWORK DEVELOPMENT CONTRACT


                                   APPENDIX B

                        DESCRIPTION OF IRIDIUM SERVICES

                 (CONFORMED 1/14/97 TO INCLUDE AMENDMENT NO. 2)
<PAGE>   71
Terrestrial Network Development Contract

                                   APPENDIX B

<TABLE>
<S>       <C>                                                                           <C>
1.        INDEX OF TELEPHONY SERVICES AND FEATURES
          The following list represents the set of system level services and
          features that the Gateway will support.

1.1       BASIC TELESERVICES                                                            AVAILABILITY
          SERVICE / FEATURE                                                             ------------
          -----------------                                                             Release *
          1.      Telephony                                                             Release *
          2.      Emergency Calls                                                                
                                   

1.2       SUPPLEMENTARY SERVICES                                                        AVAILABILITY
          SERVICE / FEATURE                                                             ------------               
          -----------------                                                                            
          Call Offering Supplementary Services                                                         
             1.   Call Forwarding unconditional (CFu)                                   Release *      
             2.   Call Forwarding On Mobile Subscriber Busy (CFb)                       Release *      
             3.   Call Forwarding On No Reply (CFnr)                                    Release *      
             4.   Call Forwarding on mobile not reachable (CFNRc)                       Release *      
          Call Completion Supplementary Services                                                       
             1.   Call Hold (HOLD)                                                      Release *      
             2.   Call Waiting (CW)                                                     Release *      
          Call Charging Supplementary Services                                                         
             1.   Advice of Charge                                                      Release *      
             2.   Debit Card                                                            Release *      
          Call Restriction Supplementary Services                                                      
             1.   Barring of all Outgoing calls (BAOC)                                  Release *      
             2.   Barring of all Incoming Calls (BAIC)                                  Release *      
          Community of Interest Supplementary Services                                                 
             1.   Closed User Group (CUG)                                               Release *      
          Multi-Party Supplementary Services                                                           
             1.   Multi-Party Service (MPTY)                                            Release *      


1.3       BEARER SERVICES                                                               AVAILABILITY   
          SERVICE / FEATURE                                                             ------------   
          -----------------
                                                                                        Release *
                            *                                                           Release *
                                                                                        Release *
             4.   Automatic Facsimile (FAX)                                             Release *


1.4       TELEPHONE FEATURES

1.4.1     BASIC TELEPHONY FEATURES                                                      AVAILABILITY
          SERVICE / FEATURE                                                             ------------                   
          -----------------                                                                                
             1.   PLMN Subscription                                                     Release *          
             2.   Mobility                                                              Release *          
             3.   Charging Services                                                     Release *          
             4.   Basic Identification                                                  Release *          
             5.   Support of DTMF                                                       Release *          
             6.   Multinumbering                                                        Release *          
             7.   Single numbering                                                      Release *          
             8.   Subscriber Identity Authentication                                    Release *          

</TABLE>

- ----------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


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                                   APPENDIX B

<TABLE>
<S>       <C>                                                                           <C>
             9.   Subscriber Identity Confidentiality procedures                        Release *
             10.  Announcements and Supervisory Tones                                   Release *
             11.  IARSTAT (Inter-administrative Revenue Accounting                      Release *
             *                                                                          Release *
             13.  Basic International Mobile Equipment Identity (IMEI) Checking)        Release *
             *                                                                          Release *

1.4.2     SUPPLEMENTARY TELEPHONY FEATURES                                              AVAILABILITY
          SERVICE / FEATURE                                                             ------------              
          -----------------                                                                           
             1.   Attach / Detach                                                       Release *     
             2.   VLR / HLR restoration according to GSM Phase II                       Release *     
             3.   Intercept (basic)                                                     Release *     
             *                                                                          Release *      
</TABLE>

- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-3
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                                   APPENDIX B

<TABLE>
<S>       <C>                                                                           <C>
2.        Index Messaging Services

2.1       BASIC DIRECTED MESSAGING SERVICES                                             AVAILABILITY
          SERVICE / FEATURE                                                             ------------
          -----------------
             1.   Directed Message Service (DMS)                                        Release *

2.1.1     DMS FEATURES AND SUPPLEMENTARY SERVICES                                       AVAILABILITY
          SERVICE / FEATURE                                                             ------------
          -----------------
             1.   Subscriber Service Session                                            Release *
             2.   Delivery Area Specification                                           Release *
             3.   Message Recall / Message Retransmit                                   Release *
                                                                                        Release *
                                                                                        Release *
                            *                                                           Release *
                                                                                        Release *
                                                                                        Release *

2.1.2     DMS VOICE MESSAGING SUPPLEMENTARY SERVICES                                    AVAILABILITY
          SERVICE / FEATURE                                                             ------------
          -----------------
             1.   Subscriber Service Session                                            Release *
             2.   Message Recall                                                        Release *
                            *                                                           Release *
                                                                                        Release *


2.2       TELEPHONY VOICE - MESSAGING                                                   AVAILABILITY
          SERVICE / FEATURE                                                             ------------
          -----------------
             1.   Enhanced Call Completion                                              Release *
             2.   Telephony Voice Messaging                                             Release *


2.2       TELEPHONY VOICE - MESSAGING SUPPLEMENTARY SERVICES                            AVAILABILITY
          SERVICE / FEATURE                                                             ------------
          -----------------
             1.   Subscriber Service Session                                            Release *
             2.   Message Recall                                                        Release *
                            *                                                           Release *
                                                                                        Release *
             5.   Store and Forward Fax                                                 Release *
</TABLE>

- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.

                                     B-4
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                                   APPENDIX B

3.       DESCRIPTION OF IRIDIUM SUBSCRIBER SERVICES

3.1.    BASIC SERVICES

         1.  Telephony
               The service which provides the transmission of speech,
               information and audible signaling tones of the PSTN / ISDN.


                                      *


         2.  Emergency Calls

               The Teleservice which provides a standardized access method to
               Emergency calling services throughout all Iridium Gateways.  In
               addition, national emergency call numbers of PSTN/ISDN will be
               usable from the ISU.


                                      *


3.2     SUPPLEMENTARY SERVICES

         Supplementary services offer enhancements to the basic call handling
         functions offered on a per-subscriber basis.  These services cannot be
         offered as "stand-alone" services, but rather must supplement an
         existing basic service

         1.  Call Forwarding Unconditional (CFU)

               The supplementary service which permits a called mobile
               subscriber to have the network send all incoming calls, or just
               those associated with a specific Basic service, addressed to the
               called mobile subscriber's directory number to another directory
               number.  The ability of the served mobile subscriber to
               originate calls is unaffected.  If this service is activated,
               calls are forwarded no matter what the condition of the
               termination.

         2.  Call Forwarding Mobile Subscriber Busy (CFB)

               The supplementary service which permits a called mobile
               subscriber to have the network send all incoming calls, or just
               those associated with a specific Basic service, addressed to the
               called mobile subscriber's directory number and which meet
               mobile subscriber busy to another directory number.  The ability
               of the served mobile subscriber to originate calls is
               unaffected.  If this service is activated, a call is forwarded
               only if the call meets mobile subscriber busy.

         3.  Call Forwarding on No Reply

               The supplementary service which permits a called mobile
               subscriber to have the network send all incoming calls, or just
               those associated with a specific Basic service,


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.

                                      B-5
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                                   APPENDIX B

               addressed to the called mobile subscriber's directory number and
               which meet no reply to another directory number.  The ability of
               the served mobile subscriber to originate calls is unaffected.
               If this service is activated, a call is forwarded only if the
               call meets no reply.

         4.  Call Forwarding on Mobile Subscriber Not Reachable (CFNRc)

               The supplementary service which permits a called mobile
               subscriber to have the network send all incoming calls, or just
               those associated with a specific Basic service, addressed to the
               called mobile subscriber's directory number, but which cannot be
               reached due to radio congestion, no paging response or because
               the subscriber is not registered, to another directory number.

         5.  Call Hold (HOLD)

               The supplementary service which allows a served mobile
               subscriber to interrupt communication on an existing call and
               then subsequently, if desired, re-establish communication.  The
               traffic channel remains assigned to the mobile subscriber after
               the communication is interrupted to allow the origination or
               possible termination of other calls.

         6.  Call Waiting (CW)

               The Call Waiting Service permits a mobile subscriber to be
               notified of an incoming call (as per basic call procedures)
               while the traffic channel is not available for the incoming
               call.  Subsequently, the subscriber can either accept, reject,
               or ignore the incoming call.

         7.  Advice of Charge (AoC)

               This service provides the means by which the ISU may indicate an
               accurate estimate of the charge that will be made for the use of
               telecommunication services.  Advice of Charge - Charge level is
               intended for applications where the user is generally not the
               subscriber but is known to the subscriber, and where the user
               pays the subscriber, rather than the Gateway Operator or
               alternatively where the charge information service supports
               another feature (i.e. debit card or Payphone).  While such
               features are specified as part of the mobile station, the Advice
               of Charge feaure - Charge level provides system support of these
               mobile station features.

         8.  Barring of Outgoing Calls (BAOC)

               The supplementary service which makes it possible for a mobile
               subscriber to prevent all outgoing calls or just those
               associated with a specific Basic service.  The ability of the
               served mobile subscriber to receive calls remains unaffected.
               The ability to set-up emergency calls remains unaffected.

         9.  Barring of all Incoming Calls (BAIC)

               The supplementary service which makes it possible for a mobile
               subscriber to prevent all incoming calls or just those
               associated with a specific Basic service.  The ability of the
               served mobile subscriber to originate calls remains unaffected.





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                                   APPENDIX B

         10.  Closed User Group (CUG)

               The supplementary service which provides the possibility for a
               group of subscribers, connected to the IRIDIUM system and/or the
               ISDN, to intercommunicate only among themselves and, if
               required, one or more subscribers may be provided with
               incoming/outgoing access to subscribers outside this group.

         11.  MultiParty Service (MPTY)

               The supplementary service which provides a mobile subscriber
               with the ability to have a multi-connection call, (i.e.  a
               simultaneous communications) between up to * parties.

3.3   BEARER SERVICES

                                      *


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-7
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                                   APPENDIX B

                                      *

         2.  Facsimile Service (FAX)

               The Bearer service which allows the connection and operation of
               Facsimile (FAX) apparatus (send and/or receive) to the IRIDIUM
               Subscriber Units of the IRIDIUM system.  Facsimile connections
               may be established between a mobile subscriber in the IRIDIUM
               network to or from * apparatus in the PSTN or the ISDN. 
               Connections to or from other types of facsimile apparatus in the
               fixed network will also be possible using the appropriate
               interworking functions of the PSTN and/or ISDN if provided.  The
               Facsimile service in the IRIDIUM network is implemented as a
               Store and Forward service only.

                                      *

3.3.1.  BASIC FEATURES

         The following features are used to support basic telephony.

         1.  PLMN Subscription

               The subscription function permits participation in teleservices
               by the mobile subscriber and is provide for by the subscriber's
               Home Gateway.

         2.  Mobility

               This function provides for the possibility of mobile
               subscriber's to roam in large areas within a Gateway or to roam
               from one Gateway area to another, initiating a location update
               procedure when it is recognized that the mobile has changed
               locations.

         3.  Charging Services

               This function comprises the task of obtaining all mobile
               subscriber call detail information required to determine
               charges.  Formatting these data items into billing


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.

                                     B-8
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                                   APPENDIX B

               records is provided at the appropriate time after the
               termination of each mobile subscriber telecommunication service.

         4.  Basic Identification


                                      *


         5.  Support of DTMF

               This function allows DTMF tone signaling to be passed reliably
               in either direction (Mobile to Land, Land to Mobile, Mobile to
               Mobile) during an established call.

               Dual Tone Multi Frequency (DTMF) is an in-band one out of four
               plus one out of four signaling system, primarily used from
               terminal instruments in telecommunication networks.  The
               international recommendations which apply are CEPT
               recommendations T/CS 34-08 (sender) and T/CS 46-02 (receiver)
               and domestic standards CCITT Q.22 through Q.25.

         6.  Multinumbering

               One or more (e.g. a set) of MSISDN numbers can be assigned to
               one mobile subscriber.  Each MSISDN can be associated with a
               specific Bearer Service capability (e.g. MSISDNx = FAX, MSISDNy
               = voice).

         7.  Single numbering

               A single MSISDN can be associated with one mobile subscriber for
               Voice, Data and Facsimile services (e.g. MSISDNx = voice, data
               and FAX).  Calls utilizing a specific



- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


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                                   APPENDIX B

               service can be delivered to an Iridium mobile subscriber using a
               single MSISDN provided the call originated from either another
               Iridium mobile subscriber (e.g. mobile to mobile call) or from a
               fixed network that provides Bearer Service capability
               information upon call setup (e.g. calls oroginating only from an
               ISDN).

         8.  Subscriber Identity Authentication

               Subscriber identity (IMSI) authentication is the corroboration
               by the land-based part of the system that the subscriber
               identity (IMSI or TMSI), transferred by the mobile subscriber
               within the identification procedure at the radio-path, is the
               one claimed.

         9.  Subscriber Identity Confidentiality procedures

                                      *

         10.  Announcements and Supervisory Tones

                                      *

         11.  IARSTAT (Inter-administrative Revenue Accounting)

               The IARSTAT is used for call accounting in Inter Administrative
               Network Traffic between the IRIDIUM network and other networks.
               This function contains all basis procedures for the switching
               subsystem including coordinating control functions, security and
               operating functions.

                                      *


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


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                                   APPENDIX B

         13.  Basic International Mobile Equipment Identify (IMEI) Checking

               IMEI checking is utilized to guard against the usage of stolen
               mobile station equipment or mobile station equipment for which
               the use in the IRIDIUM Telecommunications Network can not or no
               longer be tolerated for technical reasons (e.g. degraded
               functionality of the mobile station such that interference to
               the network could result).

                                      *

                                      *

3.3.2.   SUPPLEMENTARY TELEPHONY FEATURES

         Although not necessary for the support of basic telephony (e.g.
         "POTS"), the following system features will be supported.

         1.  Attach / Detach

                                      *

         2.  VLR/HLR restoration according to GSM Phase II

               Updated procedures (GSM Phase II) provide enhanced VLR / HLR
               restoration procedures through the ability to retrieve mobile
               subscriber information from the HLR


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-11
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                                   APPENDIX B

               without triggering an location update.  The result is a
               reduction of usage of network resources.  Specification for
               Phase II restoration are according to GSM 03.07.

         3.  Intercept

               This service provides the ability for Authorized Agencies (e.g.
               Police, secret services, etc.) to monitor mobile subscribers in
               the IRIDIUM telecommunications network.  Monitoring applies to
               network clients (subscribers in their home Gateway) as well as
               to foreign "roamers".  Monitoring is accomplished within the
               gateway where the Intercept feature is invoked by 

                                      *


               The provision of the Monitoring Center equipment is the
               responsibility of the monitoring agent.

                                      *

         5.  Debit Card

               This feature provides a pre-paid, realtime debit service which
               allows users of the Iridium telecommunications system to
               purchase airtime and other related call charges in packages of
               incremental sizes (based in minutes of usage).  The Debit Card
               functionality must be provided through the Iridium Subscriber
               Unit and is supported at the network and Gateway level by other
               telephony Supplementary features (e.g. Advice of Charge).




- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-12
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                                   APPENDIX B


4.       MESSAGING SERVICES

IRIDIUM Messaging Services can be categorized by those available to messaging
subscribers and those available to telephony subscribers.  These messaging
services are supported by the Messaging Infrastructure.  Some depend on the
existence of Telephony services to be utilized, while others are dependent on
basic Messaging Services.  The delivery mechanism of the two categories of
messaging services varies also and will be described in the appropriate
delivery sections.

Basic Messaging services are those services providing the complete capability
for Messaging communications between users according to protocols established
by design and agreement between network operators and Service Providers.
Supplementary Services modify or supplement a basic service.  Supplementary
services cannot be offered to an IRIDIUM subscriber as a stand-alone service.
They must be offered in association with a basic service.  The same
supplementary service may be applicable to a number of Messaging services.

4.1.     DIRECTED MESSAGING SERVICES FOR MESSAGING SUBSCRIBERS

4.1.1.   BASIC DIRECTED MESSAGE SERVICE (DMS)

         Directed Messaging Service, or DMS , is a unidirectional service which
         allows for the origination and delivery of numeric and alphanumeric
         messages to Message Termination Devices (MTDs, aka-pages).  Callers
         desiring to originate a message to a messaging subscriber must access
         the Messaging Infrastructure and identify the messaging subscriber and
         the desire service.  Origination session types supported are voice
         connection and data connection.  Dual Tone Multi-Frequency (DTMF) is
         required for origination and access sessions via a voice connection.
         Input devices for data connections include some type of computer
         terminal or remote entry device (e.g. Alphamate).  The first
         operational system will limit numeric messages to 20 4-bit BCD digits
         and alphanumeric messages to 464 bits of character information maximum
         with an average of 320 bits of character information.  The Gateway
         Messaging Subsystem will be designed to support alphanumeric messages
         up to * (e.g. * characters).  The encoding currently supported for
         alphanumeric messages is * which translates to * characters maximum
         and * characters average.  The messages are stored for later
         reference if needed and delivered to a location specified by the
         subscriber.

4.1.2.   DMS FEATURES & SUPPLEMENTARY SERVICES

If provisioned for Directed Messaging Basic Service, the following features are
provided and the supplementary services are available for subscription.  Once
subscription is complete, the subscriber has control of activating and
deactivating the supplementary services and accessing features.



- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


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                                   APPENDIX B

         1.  Subscriber Service Section

               The Subscriber Service Session (SSS) feature provides for
               mailbox maintenance and profile management by the subscriber.
               The session is password protected, thereby only permitting
               service to authorized users.  Profile management includes
               password setting, delivery area specification, greeting
               recording, default language specification for prompts and
               enunciating numeric messages, and service settings.

         2.  Delivery Area Specification

               The location of where DMS messages need to be delivered must be
               known to the system prior to delivery.  The delivery area is
               specified by selecting one or multiple * Message
               Delivery Areas (MDAs) from a predefined set of MDAs.  Each MDA
               specifies an area on the globe.  The range of MDAs is *.

                                      *

               Typically the subscriber sets the delivery area via a Subscriber
               Service Session (SSS) or via a Service Provider. 


                                      *


               It is the responsibility of the Service Providers to provide the
               MDA definition information to their subscribers.  

                                      *


         3.  Message Recall/Message Retransmit

               Message Recall / Message Retransmit service is a DMS feature
               that allows the subscriber to inspect the DMS messages in his
               mailbox.  The system has the capability to retransmit all
               messages in the mailbox to the subscriber's MTD, and to
               enunciate (in the subscriber's default language), via a voice
               connection, the numeric messages.  All deposited messages are
               statused as to the deposit date and time, message class (urgent,
               normal), plus the sequence number of the message.

                                      *


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-14
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                                   APPENDIX B

                                      *




- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-15
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                                      *

4.1.3.   DMS VOICE MESSAGING

               The Voice Messaging (VM) service is a supplementary service
               which allows the ability to record, store, retrieve and
               manipulate spoken messages.  All VM messages are recorded
               accurately and allow a caller to leave detailed information in
               their own voice, with all the inflections and tonal qualities
               which this form of communications allows.


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


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                                   APPENDIX B



               The Messaging Infrastructure can support DMS VM notifications up
               to * bits (e.g. * characters).  The first operational system will
               limit DMS VM numeric notifications to 20 4-bit BCD digits and 
               alphanumeric notifications to  *  of character information 
               (i.e.  *  characters).

4.1.4.   DMS VOICE MESSAGING SUPPLEMENTARY SERVICES

         1.  Subscriber Service Session

               The Subscriber Service Session (SSS) feature provides for
               mailbox maintenance and profile management by the subscriber.
               The session is password protected, thereby only permitting
               services to authorized users.  Profile management includes
               password setting, delivery area specification for notifications,
               greeting and voice signature recording, default language
               specification for prompts, and service settings.

         2.  Message Recall

               Message Recall service is a VM feature that allows the
               subscriber to listen to the VM messages in this mailbox.  All
               deposited VM messages are statused as to the deposit date and
               time, and message class (urgent, normal).

                                              *


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-17
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                                   APPENDIX B

4.2.     TELEPHONY VOICE - MESSAGING

         1.  Enhanced Call Completion

               Enhanced Call Completion service is a feature of the IRIDIUM
               telephony service and is intended to be offered to every IRIDIUM
               telephony user.  Enhanced Call Completion service permits a
               called IRIDIUM telephony subscriber to be informed via a message
               from the caller when an incoming call addressed to the called
               mobile subscriber's directory number met the telephony
               definition of "not reachable".  In operation, ECC service is
               invoked as the result of a failure to reach an ISU (mobile
               terminated call) due to the telephony condition "mobile
               subscriber not reachable".  It allows a caller to input a 20
               digit message to be delivered to the telephony subscriber.

               Although this service utilizes the call forwarding supplementary
               services of telephony, the subscriber will not be required to
               subscribe to call forwarding for ECC service.  If the telephony
               subscriber desires to explicitly use call forwarding services
               (for other purposes such as forwarding on busy to Voice
               Messaging), the subscriber must subscribe to call forwarding.

               The Enhanced Call Completion message is delivered to the ISU
               subscriber in the same location as is currently identified for
               that subscriber's telephony service 

                                            *

               Precedence is given to normal IRIDIUM telephony call forwarding
               services over those of ECC.  If the subscriber explicitly
               forwards his calls on "not reachable" to another number or to
               his Voice Messaging, these take precedence over ECC.  Only the
               deactivation of the explicit call forwarding will reactivate
               ECC.  A call normally forwarded for telephony will not be
               forwarded to the ECC service, no matter what the number of
               forwardings may be.

         2.  Telephony Voice Messaging

               The Voice Messaging (VM) service is supplementary service which
               allows the ability to record, store, retrieve and manipulate
               spoken messages.  All VM messages are recorded accurately and
               allow a caller to leave detailed information in their own voice,
               with all the inflections and tonal qualities which this form of
               communications allows.

               Telephony VM notifications are delivered to telephony
               subscribers on their mobile stations (ISUs).  The Messaging
               Infrastructure can support Telephony VM notifications up to *
               (i.e. * characters).  The first operational system will limit 
               Telephony VM notification messages to * (i.e. * characters), 
               either numeric or alphanumeric.

4.2.1.   TELEPHONY VOICE MESSAGING SUPPLEMENTARY SERVICES

         1.  Subscriber Service Session

               The Subscriber Service Session (SSS) feature provides for
               mailbox maintenance and profile management by the subscriber.
               The session is password protected, thereby


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-18
                       MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   88
 Terrestrial Network Development Contract

                                   APPENDIX B

               only permitting services to authorized users.  Profile
               management includes password setting, delivery type
               specification for notifications, destination address (MTD or
               ISU), greeting and voice signature recording, default language
               specification for prompts, and service settings.  The
               destination address (MTD or ISU) is customizable via the Service
               Provider.

         2.  Message Recall

               Message Recall service is a VM feature that allows the
               subscriber to listen to the VM messages in his mailbox.  

                                      *

         5.  Store and Forward Fax

               Fax transmission between ISU and PSTN users, and between ISU and
               ISU users, employs a two-stage store and forward approach.  PSTN
               users can use their current analog (i.e., 2 wire) * machines.


- ---------------------

*      Information has been omitted and filed separately with the Commission
       pursuant to Rule 406 of the Securities Act of 1933.


                                      B-19
                       MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   89
                                   APPENDIX C


               DESCRIPTION OF GATEWAY MANAGEMENT FUNCTIONAL AREAS





                 (CONFORMED 1/14/97 TO INCLUDE AMENDMENT NO. 2)





<PAGE>   90
                       MOTOROLA CONFIDENTIAL PROPRIETARY

C1.0    GATEWAY MANAGEMENT FUNCTIONAL AREAS

        Gateway Network Management features are provided to support the
        following categories of functions:

        -       Performance Management provides functions to collect, evaluate
                and report on the performance of the Gateway and the
                effectiveness of the Gateway Subsystems

        -       Fault Management is a set of functions that enable the
                detection, isolation, correction, and presentation of abnormal
                operation of the Gateway and its Subsystems

        -       Configuration Management provides functions to exercise control
                over, identify, collect data from, and provide data to Gateway
                Subsystems

        -       Accounting Management provides a set of functions that enable
                the use of Network services to be measured and the costs of
                such use to be determined
        
        -       Security Management provides functions to protect the Gateway
                from unauthorized access and/or control

        While all of these categories must be supported by the Gateway, the
        features which support these categories will vary in the degree of
        automation.

        In general, the Gateway will require an operations staff that can use
        these features to operate.  The degree of automation will depend on
        need, schedule, and budget constraints of the cooperating operational
        systems in the network (e.g., SCS, GBS, Gateway).

C2.0    GATEWAY FEATURES RELATED TO NETWORK OA&M

        The following features will be supported by the Gateway, which in turn
        can be used to support network level operations (i.e., the interactions
        of the GW with other segments of the network such as SCS & GBS--Gateway
        Business System).  It is assumed that the Gateway Business System (GBS)
        will be available to SATCOM              *



- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                      C-1

                       MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   91
                       MOTOROLA CONFIDENTIAL PROPRIETARY


<TABLE>
<S>     <C>                                                                             <C>
C2.1    GATEWAY CONFIGURATION MANAGEMENT SERVICES--RELATED TO NETWORK O&M
        -       Gateway status data (GW-STATD)                                          (Rel *)
        -       Asynchronous Gateway status change propagation to SCS and/or GBS        (Rel *)
        -       Network status data (NW-STATD)                                          (Rel *)
        -       Gateway configuration data received from SCS and/or GBS                 (Rel *)
        -       Direct Gateway configuration by SCS and/or GBS via Remote Login         (Rel *)
        -       Gateway inventory management                                            (Rel *)

C2.2    GATEWAY FAULT MANAGEMENT SERVICES--RELATED 
        TO NETWORK O&M
        -       Gateway Fault propagation to SCS and/or GBS                             (Rel *)
        -       Trouble tickets and maintenance tickets                                 (Rel *)
        -       Direct Fault and maintenance support from SCS and/or GBS via Remote     (Rel *)
                Login                                                                   
        -       Test procedure requests by SCS and/or GBS via Maintenance Orders        (Rel *)

C2.3    GATEWAY PERFORMANCE MANAGEMENT SERVICES--RELATED
        TO NETWORK O&M
        -       Gateway performance and workload data (GPWD) propagation to SCS         (Rel *)
                and/or GBS
        -       Standard performance reports                                            (Rel *)
        -       Custom performance reports                                              (Rel *)
        -       Performance Measurement Thresholding                                    (Rel *)
        -       SCS and/or GBS access to performance reports via Remote Login           (Rel *)

C2.4    GATEWAY ACCOUNTING MANAGEMENT SERVICES--RELATED TO 
        NETWORK O&M
        -       Notification of CDR availability on a scheduled basis to SCS 
                and/or GBS                                                              (Rel *)
        -       Requested CDR propagation_ to SCS and/or GBS                            (Rel *)
        -       Asynchronous HCDR propagation_ to SCS and/or GBS                        (Rel *)

C2.5    GATEWAY SECURITY MANAGEMENT SERVICES--RELATED TO
        NETWORK O&M
        -       Management User access control                                          (Rel *)
        -       Management User authentication                                          (Rel *)
        -       Management User authorization                                           (Rel *)
        -       Security monitoring                                                     (Rel *)
        
C3.0    GATEWAY FEATURES RELATED TO LOCAL OA&M
        The following features will be supported by the Gateway, and are used 
        to support local operations of the Gateway.

C3.1    GATEWAY LOCAL O&M SERVICES - CM
        -       Local configuration data generation                                     (Rel *)
        -       Network and local configuration data download (includes software and    (Rel *)
                control data)
        -       Direct device configuration (via Pass-Thru)                             (Rel *)         
        -       Subscriber configuration                                                (Rel *)
        -       Equipment status                                                        (Rel *)
        -       Inventory management                                                    (Rel *)
        -       Backup, recovery, and archiving                                         (Rel *)
        -       GW-STATD calculation and reporting                                      (Rel *)
</TABLE>




- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                      C-2

                       MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   92
                       MOTOROLA CONFIDENTIAL PROPRIETARY


<TABLE>
<S>     <C>                                                                             <C>
C3.2    GATEWAY LOCAL O&M SERVICES - FM
        -       Fault detection, notification, and isolation                            (Rel *)
        -       Fault circumvention and/or correction                                   (Rel *)
        -       Execution of audits and diagnostics (on-demand and scheduled)           (Rel *)
        -       Fault logging, presentation, and updating                               (Rel *)
        -       Trouble tracking                                                        (Rel *)
        -       Maintenance scheduling                                                  (Rel *)

C3.3    GATEWAY LOCAL O&M SERVICES - PM
        -       Performance data collection and reporting                               (Rel *)
        -       Performance data analysis                                               (Rel *)
        -       Scheduled and on-demand collection and reporting                        (Rel *)
        -       Standard and Custom report generation                                   (Rel *)
        -       Threshold monitoring and generation                                     (Rel *)
        -       GPWD determination and reporting                                        (Rel *)

C3.4    GATEWAY LOCAL O&M SERVICES - AM
        -       CDR generation, output, monitoring and storage                          (Rel *)
        -       HCDR generation, output, monitoring and storage                         (Rel *)

C3.5    GATEWAY LOCAL O&M SERVICES - SM
        -       Management User access control                                          (Rel *)
        -       Management User authentication                                          (Rel *)
        -       Management User authorization                                           (Rel *)
        -       Management Security monitoring                                          (Rel *)

C3.6    GATEWAY O&M SERVICES TO SUPPORT MESSAGING
        -       Update Appropriate O&M Services as Required                             (Rel *)
</TABLE>



- ----------------------------------

     *   Information has been omitted and filed separately with the Commission
         pursuant to Rule 406 of the Securities Act of 1933.

                                      C-3

                       MOTOROLA CONFIDENTIAL PROPRIETARY
<PAGE>   93
                                  Attachment 1

                                FORM OF WARRANT

NEITHER THE WARRANTS REPRESENTED BY THIS WARRANT CERTIFICATE NOR THE CLASS 1
MEMBERSHIP INTERESTS OF IRIDIUM LLC (THE "COMPANY") FOR WHICH THE WARRANTS
REPRESENTED BY THIS WARRANT CERTIFICATE ARE EXERCISABLE (THE "WARRANT SHARES")
MAY BE OFFERED OR SOLD IN THE UNITED STATES ABSENT REGISTRATION UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), AND ANY APPLICABLE STATE
SECURITIES LAWS OR AN EXEMPTION FROM THOSE REGISTRATION REQUIREMENTS.
ACCORDINGLY, THE HOLDER OF THIS WARRANT CERTIFICATE SHALL NOT BE ENTITLED TO
TRANSFER OR EXERCISE SUCH HOLDER'S WARRANTS AT ANY TIME UNLESS, AT THE TIME OF
SUCH TRANSFER OR EXERCISE, (I) A REGISTRATION STATEMENT UNDER THE ACT RELATING
TO THE WARRANTS OR THE WARRANT SHARES, AS THE CASE MAY BE, HAS BEEN FILED WITH,
AND DECLARED EFFECTIVE BY, THE SECURITIES AND EXCHANGE COMMISSION (THE "SEC"),
AND NO STOP ORDER SUSPENDING THE EFFECTIVENESS OF SUCH REGISTRATION STATEMENT
HAS BEEN ISSUED BY THE SEC OR (II) THE TRANSFER OF THE WARRANTS REPRESENTED BY
THIS CERTIFICATE OR THE ISSUANCE OF THE WARRANT SHARES IS PERMITTED PURSUANT TO
AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE ACT.

TRANSFER OF THE WARRANTS REPRESENTED BY THIS WARRANT CERTIFICATE AND THE
WARRANT SHARES IS ALSO RESTRICTED BY THE TERMS OF A LIMITED LIABILITY COMPANY
AGREEMENT, DATED AS OF JULY __________, 1996 BY AND AMONG THE PARTIES NAMED
THEREIN (THE "LLC AGREEMENT").  A COPY OF THE LLC AGREEMENT IS ON FILE AND
AVAILABLE FOR INSPECTION BY THE HOLDER OF THIS WARRANT CERTIFICATE AT THE
COMPANY'S PRINCIPAL EXECUTIVE OFFICES.

TRANSFER OF THE WARRANT SHARES IS ALSO RESTRICTED FROM FIVE YEARS FROM THE
ORIGINAL DATE OF THE ISSUANCE THEREOF.  SEE SECTION 7 HEREIN.


No. __________________Warrants
WARRANT TO PURCHASE CLASS 1 MEMBERSHIP INTERESTS

of

IRIDIUM LLC

This Warrant Certificate certifies that _________, or registered permitted
assigns, is the registered holder of ________ warrants expiring _________ to
purchase an aggregate of _________________ Class 1 Membership Interests in the
Company (the "Class 1 Interests"), of Iridium LLC, a Delaware limited liability
company (the "Company"). The Warrants evidenced hereby are part of a duly
authorized issue of Warrants of the Company (the "Warrants") all evidenced by
Warrant Certificates substantially similar to this Warrant Certificate.  Each
Warrant entitles the holder upon exercise to purchase from the Company at any
time on or after  __________________ and prior to 5:00 p.m. New York City time
on ___________________, one Class 1 Interest ("Warrant Share") upon surrender
of this Warrant Certificate to the Warrant Agent, subject to the conditions set
forth herein. The number of Warrant Shares purchasable upon exercise thereof
are subject to adjustment upon the occurrence of certain events set forth
herein.  Exercise of a Warrant by a person other than the registered holder
named above is subject to the approval of such person for admission as a Member
of the Company by the Members of the Company who may grant or withhold such
consent in their absolute discretion.  Warrant Shares shall not be
transferrable





                                       1
<PAGE>   94
for a period of five years from the original date of the issuance thereof and
will bear a legend to that effect.

SECTION 1.  EXERCISE OF THE WARRANTS.  Warrants may be exercised at any time on
or after ___________ and prior to 5:00 p.m. New York City time on ___________
(the "Expiration Date").  The holder of Warrants evidenced by this Warrant
Certificate may exercise such Warrants by surrendering this Warrant
Certificate, with the form of election to purchase set forth hereon properly
completed and executed, together with payment to the Company of the Exercise
Price for each Warrant then exercised.  Exercise of this Warrant by a person
other than the registered holder named in the preamble of this Warrant is
subject to the approval of such person for admission as a Member of the Company
by the Members of the Company who may grant or withhold such consent in their
absolute discretion.  In the event that upon any exercise of Warrants evidenced
hereby the number of Warrants exercised shall be less than the total number of
Warrants evidenced hereby, the Company shall issue to the holder hereof or his
permitted assignee a new Warrant Certificate evidencing the number of Warrants
not exercised.  No cash dividend shall be paid to a holder of Warrants Shares
issuable upon the exercise of Warrants unless such holder was, as of the record
date for the declaration of such dividend, the record holder of such Warrant
Shares.

    No Warrant may be exercised after the Expiration Date, and to the extent
not exercised by such time, such Warrants shall become void. The Company shall
give notice of expiration not less than 90 nor more than 120 days prior to the
Expiration Date to the registered holders of the then outstanding Warrants;
provided, however, that if the Company fails to give such notice, the Warrants
shall still terminate and become void on the Expiration Date.

    SECTION 3.  REGISTRATION OF TRANSFER AND EXCHANGE.  The Company and its
agents may deem and treat the registered holder(s) of this Warrant Certificate
as the absolute owner(s) hereof (notwithstanding any notation of ownership or
other writing hereon made by anyone), for all purposes, and neither the Company
nor its agents shall be affected by any notice to the contrary.

    References herein to "Warrant holder(s)" or "holders of the Warrant
Certificates" means in each case registered holders of Warrant Certificates.

    Subject to the restrictions on transfer referred to in the Legend on page 1
of this Warrant Certificate, Warrant Certificates, when surrendered at the
office maintained by the Company for such purpose by the registered holder
thereof in





                                       2
<PAGE>   95
person or by legal representative or attorney duly authorized in writing, may
be presented for exchange or registration of transfer without payment of any
service charge (except for stamp or any other governmental tax or charge that
may be imposed in connection with any such transfer or exchange), for another
Warrant Certificate or Warrant Certificates representing a like tenor executed
by the Company in the aggregate a like number of Warrants.

    Every Warrant Certificate surrendered for registration of transfer or
exchange shall (if so required by the Company) be duly endorsed, or be
accompanied by a written instrument of transfer in any form satisfactory to the
Company, duly executed by the Warrant holder or his attorney duly authorized in
writing (with, in the case of transfer and if requested by the Company, such
signature guaranteed by an eligible guarantor institution).

    All Warrant Certificates issued upon any registration of transfer or
exchange of Warrant certificates shall be the valid obligations of the Company,
evidencing the same obligations, and entitled to the same benefits under this
Certificate, as the Warrant Certificates surrendered for such registration of
transfer or exchange, except for the limitation on right of exercise set forth
in the third sentence of Section 1.

    SECTION 4.  RETIREMENT OF WARRANTS.  The Company may purchase Warrants. Any
Warrants purchased by the Company may be retired by cancellation of such
Warrants and appropriate notation thereof in the Company's register.

    SECTION 5.  PAYMENT OF TAXES.  The Company will pay all taxes and other
governmental charges attributable to the initial issuance of Class 1 Interests
upon the exercise of Warrants; provided, however, that the Company shall not be
required to pay any such taxes or charges which may be payable in respect of
any transfer involved in the issue of any Warrant Certificates or any
certificates for Class 1 Interests in a name other than that of the registered
holder of a Warrant Certificate surrendered upon the exercise of a Warrant, and
the Company shall not be required to issue or deliver such Warrant Certificates
unless or until the person or persons requesting the issuance thereof shall
have paid to the Company the amount of such taxes or charges or shall have
established to the satisfaction of the Company that such taxes or charges have
been paid.

    SECTION 6.  MUTILATED OR MISSING WARRANT CERTIFICATES.  In case this
Warrant Certificate shall be mutilated, lost, stolen or destroyed, the Company
may in its discretion issue, in exchange and substitution for and upon
cancellation of the mutilated Warrant Certificate, or in lieu of and
substitution for the Warrant Certificate lost, stolen or destroyed, a new
Warrant





                                       3
<PAGE>   96
Certificate of like tenor and representing an equivalent number of Warrants,
but only upon receipt of evidence satisfactory to the Company of such loss,
theft or destruction for such Warrant Certificate and indemnity and security
therefor, if requested, also satisfactory to the Company.  Applicants for such
substitute Warrant Certificates shall also comply with such other reasonable
regulations and pay such other reasonable charges as the Company may prescribe.

    SECTION 7.  RESERVATIONS OF WARRANT SHARES.  The Company (i) shall at all
times reserve and keep available, free from preemptive rights, out of the
aggregate of its authorized but unissued Class 1 Interests, for the purpose of
enabling it to satisfy any obligation to issue Warrant Shares upon exercise of
Warrants, the maximum number of Class 1 Interests which would then be
deliverable upon the exercise of all outstanding Warrants if all such
outstanding Warrants were then exercisable and (ii) shall not take any action
which results in any adjustment of the Exercise Rate if the total number of
Warrant Shares would exceed the total number of Class 1 Interests then
authorized by the Company's certificate of incorporation and available for the
purpose of issue upon such exercise.

    The transfer agent for the Class 1 Interests (which may be the Company if
it is acting as transfer agent) (the "Transfer Agent") and every subsequent
transfer agent for any interests of the Company issuable upon the exercise of
any of the rights of purchase aforesaid will be irrevocably authorized and
directed at all times to reserve such number of authorized interests as shall
be required for such purpose.

    The Company covenants that all Warrant Shares which may be issued upon
exercise of Warrants will, upon payment of the Exercise Price and issuance, by
duly and validly issued, free of preemptive rights and free from all taxes,
liens, charges and security interests with respect to the issue thereof;
provided, however, that Warrant Shares will not be transferrable for a period
of five years from the original date of the issue thereof and will bear a
legend to that effect.

    SECTION 8.  ADJUSTMENT OF WARRANT SHARES ISSUABLE.  The Warrants
represented by this Warrant Certificate will initially be exercisable by the
holder thereof to purchase one Class 1 Interest at $.01 per interest.  The
number of Warrant Shares that may be purchased upon the exercise of each
Warrant (the "Exercise Rate") will be subject to adjustment from time to time
upon the occurrence of the events enumerated in this Section 8.  For purposes
of this Section 8, "Class 1 Interests" means the Class 1 Interests and any
other interests in the Company for which the Warrants may be exercised and
where, as a result of this definition, the term refers to more than one class
of interests,





                                       4
<PAGE>   97
the adjustment provisions of this Section 8 shall be equitably adjusted to
achieve as nearly as practicable the intended result as evidenced by the text
of such adjustment provisions.

    (a)      Adjustments for Change in Class 1 Interests.

    If at any time after March 1, 1996 the Company:

    (1)      pays a dividend or makes a distribution on its Class 1 Interests
             in Class 1 Interests;

    (2)      subdivides its outstanding Class 1 Interests into a greater number
             of Class 1 Interests;

    (3)      combines its outstanding Class 1 Interests into a smaller number
             of Class 1 Interests;

    (4)      pays a dividend or makes a distribution on its Class 1 Interests
             in interests other than Class 1 Interests; or

    (5)      issues by reclassification of its Class 1 Interests any of its
             other interests;

then the Exercise Rate in effect immediately prior to such action shall be
proportionately adjusted so that the holder of any Warrant thereafter exercised
may receive the aggregate number and kind of shares of, or interests in, the
Company which such holder would have owned immediately following such action if
such Warrant had been exercised immediately prior to such action.

    The adjustment shall become effective immediately after the record date in
the case of a dividend or distribution and immediately after the effective date
in the case of a subdivision, combination or reclassification.

    If after an adjustment and upon exercise of a Warrant the holder may
receive two or more classes of interests in the Company, the Company shall
determine the allocation of the adjusted Exercise Price between the classes.
Notwithstanding any other provision hereof, the Exercise Price with respect to
the issuance of any Warrant Share shall not be less than $.01 per share.  After
such allocation, the exercise privilege and the Exercise Rate with respect to
each class of interests shall thereafter be subject to adjustment on terms
comparable to those applicable to Class 1 Interests in this Section 8.

    Such adjustment shall be made successively whenever any event listed above
occurs.

    (b)      Adjustment for Rights Issue.





                                       5
<PAGE>   98
    If the Company distributes any rights, options or warrants to all holders
of its Class 1 Interests entitling them for a period expiring within 60 days
after the record date mentioned below to purchase Class 1 Interests or
securities convertible into, or exchangeable or exercisable for, Class 1
Interests at a price per interest less than the Current Market Value (as
defined in subsection (d)) per interest as of the Time of Determination (as
defined in subsection (d)), the Exercise Rate shall be adjusted in accordance
with the formula:

             E'  =  E  x   O + N           
                         -----------       
                                                 N x P
                                                 -----
                                         O    +    M

where:

E'  =        the adjusted Exercise Rate.

E   =        the current Exercise Rate.

O   =        the number of Class 1 Interests outstanding on the record date.

N   =        the number of additional Class 1 Interests offered.

P   =        the offering price per additional Class 1 Interests.

M   =        the Current Market Value per interest (as defined in Subsection
             (d)).

    The adjustment shall become effective immediately after the record date for
the determination of stockholders entitled to receive the rights, warrants or
options to which this subsection (b) applies.  To the extent that Class 1
Interests are not delivered after the expiration of such rights or warrants,
the Exercise Rate shall be readjusted to the Exercise Rate which would
otherwise be in effect had the adjustment made upon the issuance of such rights
or warrants been made on the basis of delivery of only the number of Class 1
Interests actually delivered.  In the event that such rights or warrants are
not so issued, the Exercise Rate shall again be adjusted to be the Exercise
Rate which would then be in effect if such date fixed for determination of
holders entitled to receive such rights or warrants had not been so fixed.

    No adjustment shall be made under this subsection (b) if the application of
the formula stated above in this subsection (b) would result in a value of E'
that is lower than the value of E.
    (c)      Adjustment for Other Distributions.





                                       6
<PAGE>   99
    If the Company distributes to all holders of its Class 1 Interests any of
its assets, debt securities or any rights, options or warrants to purchase debt
securities, assets or other interests in or securities of the Company
(including securities or cash, but excluding (1) distributions of Class 1
Membership Interests or interests referred to in subsection (a) and
distributions of rights, warrants or options referred to in subsection (b) and
(2) cash dividends or other cash distributions that are paid out of current or
accumulated earnings), the Exercise Rate shall be adjusted in accordance with
the formula:

             E'  =  E  x   M
                         -----    
                            M-F
where:

E'  =        the adjusted Exercise Rate.

E   =        the current Exercise Rate.

M   =        the Current Market Value per Class 1 Interest on the record date
             for the determination of holders entitled to receive the
             distribution.

F   =        the fair market value (as determined by the Board of Directors
             whose determination shall be conclusive) of the assets,
             securities, interests, rights or warrants applicable to one Class
             1 Interest as of the Time of Determination for the determination
             of holders entitled to receive the distribution.

    The adjustment shall be made successively whenever any such distribution is
made and shall become effective immediately after the record date for the
determination of holders entitled to receive the distribution.

    The Company shall give the Warrant holders at least 10 days notice of a
record date for any dividend payment or other distribution on the Class 1
Interests.

    (d)      Current Market Value; Time of Determination.

    "Current Market Value" per Class 1 Interest or any other interest or
security at any date means, on any date of determination the average of the
Closing Prices of the Class 1 Interests (or such interest or security) for the
20 consecutive Business Days selected by the Board of Directors commencing no
more than 30 Business Days before and ending no later than the day before the
day in question; provided that, in the case of clause (c), if the period
between the date of the public announcement of the dividend or distribution and
the date for the





                                       7

<PAGE>   1
                                                                    EXHIBIT 10.9



                               SUPPORT AGREEMENT


                 THIS SUPPORT AGREEMENT (this "Agreement"), dated as of July
15, 1992 by and between Motorola Inc., a Delaware corporation ("Motorola") and
Iridium, Inc., a Delaware corporation ("Iridium").

                 WHEREAS, Iridium is a company formed to own and operate the
space and system control segments of the IRIDIUM system;

                 WHEREAS, Iridium requires certain administrative, legal,
financial and other services in order to conduct its business and Motorola has
provided, and has agreed to provide, certain of these services to Iridium;

                 AND WHEREAS, Motorola and Iridium wish to memorialize their
agreements as to the services provided, and to be provided, to Iridium and the
payments to be made by Iridium to Motorola for such services;

                 NOW THEREFORE, in consideration of the mutual covenants
contained herein, Motorola and Iridium hereby agree as follows:

                 1.  Legal and Financial Advisors.

                 (a)      Prior to the date hereof, Motorola:

                          (1)     Retained Goldman, Sachs & Co. ("GS&Co") to
                                  act as Iridium's financial advisor in
                                  connection with offerings of its debt and
                                  equity securities.

                          (2)     Retained Kirkland & Ellis ("K&E") to act as
                                  Iridium's legal advisor in connection with
                                  offerings of its debt and equity securities.

                          (3)     Retained Steptoe & Johnson ("S&J") to
                                  represent interest of the Iridium system
                                  before the Federal Communications Commission
                                  and other agencies of the United States
                                  government.

                          (4)     Retained Fletcher, Heald & Hildreth ("F.&H")
                                  to represent the interest of the Iridium
                                  system before the Federal Communications
                                  Commission and other agencies of the United
                                  States government.

<PAGE>   2
                 (b)  Iridium hereby ratifies and approves Motorola's retention
of GS&Co, K&E, S&J and F.&H for such purposes and agrees to reimburse Motorola
on demand for the fees, expenses and other charges of GS&Co, K&E, S&J and F.&H
in connection with services performed on Iridium's behalf.

                 2. Consultants. If an officer of Iridium asks Motorola to
retain a third party consulting organization to provide services to Iridium,
(i) Motorola shall retain such organization for such purpose and (ii) Iridium
shall reimburse Motorola on demand for the fees, expenses and other charges of
such organization in connection with services performed on Iridium's behalf.

                 3.  Motorola Employees.

                 (a) As of October 1, 1991 (or, in certain cases, as of later 
dates), Motorola has seconded the Motorola employees listed on Exhibit A 
hereto (each a "Seconded Employee") to act as officers and employees of
Iridium.  If Motorola and Iridium so agree in writing, additional employees of
Motorola shall become Seconded Employees.

                 (b) Iridium shall reimburse Motorola on demand for the
compensation, benefits and out-of-pocket expenses of each Seconded Employee
from the date such Seconded Employee is seconded to Iridium until the date on
which either (i) such Seconded Employee ceases to act as an officer or employee
of Iridium for whatever reason or (ii) such Seconded Employee resigns his or
her employment with Motorola and becomes an employee of Iridium.

                 (c) If Iridium and Motorola agree that employees of Motorola
other than Seconded Employees shall provide services to Iridium, Iridium shall
reimburse Motorola on demand for the compensation, benefits and out-of-pocket
expenses of such employees for the periods during which such employees provide
services to Iridium.

                 (d) Iridium shall also reimburse Motorola on demand for the
compensation, benefits and out-of-pocket expenses paid or  incurred by Motorola
for each  Iridium employee, including those Iridium employees listed on Exhibit
B hereto as "Other Employees".

                 4.  Books and Records.  Motorola shall (i) keep full and
adequate books of accounts and records reflecting all transactions and matters
covered by this Agreement in accordance with its normal accounting practices
and principles and (ii) make such books and records available to Iridium at all
reasonable times for inspection and copying.

                 5.       Independent Contractor.  In providing services
hereunder, Motorola shall act solely as an independent contractor. Nothing
herein shall create a partnership, joint





                                      -2-
<PAGE>   3
venture or relationship of principal and agent between Motorola and Iridium.
Notwithstanding any other provision hereof, the business and affairs of
Iridium shall at all times be conducted by or under the direction of its board
of directors.

                 6.  Access.  Iridium shall provide Motorola such access to its
properties as is necessary or desirable for Motorola to provide the services
contemplated by this Agreement.

                 7.  Termination.  Either party shall have the right to
terminate this Agreement upon 60 days written notice to the other party and
Motorola shall have the right to terminate this Agreement at any time when
Motorola owns less than half of Iridium's then outstanding voting securities;
provided, however, that Iridium's obligation to pay Motorola for services
rendered prior to the termination of this Agreement under paragraphs 1, 2 and 3
hereof  will survive the termination of this Agreement.

                 8.  Successors and Assigns.  Iridium shall not assign this
Agreement without the prior written consent of Motorola.  All covenants and
agreements contained in this Agreement by or on behalf of either of the parties
hereto shall bind the respective successors and assigns of such parties  and
shall inure to the benefit of the permitted successors and assigns of such
parties, whether so expressed or not.

                 9.  Notices.  All notices and other communications provided
for in this Agreement shall be delivered and sent by first class mail (postage
paid, return receipt requested) to Motorola at:

                          Motorola, Inc.
                          1303 East Algonquin Road
                          Schaumburg, Illinois   60196
                          Facsimile:  708-576-3258
                          Attention: Law Department

or at such other address as Motorola shall have furnished to Iridium and to
Iridium, at:

                          Iridium, Inc.
                          1350 I Street, N.W., Suite 400
                          Washington, D.C.  20005
                          Facsimile: 202-842-3578
                          Attention:   President

 or at such other address as Iridium shall have furnished to Motorola.





                                      -3-
<PAGE>   4
                 10.  Governing Law.  This Agreement will be governed by the
laws of the State of  Illinois without giving effect to any choice of law
provision or rule that would cause the application of the laws of any other
jurisdiction.

                 11.  Amendments and Waivers.  This Agreement  may be amended
and  the observance of any provision hereof may be waived (either generally or
in particular instances and either retroactively or prospectively) only with
the written consent of Motorola and Iridium.

                 12.  Entire Agreement.  This Agreement constitutes the entire
agreement between Motorola and Iridium regarding the subject matter hereof and
supersedes any understandings, agreements, or representations by such parties,
written or oral, made at any time prior to the date hereof that relate to the
subject matter hereof.

                 13.  Descriptive Headings.  The descriptive headings in this
Agreement are inserted for convenience only and are not part of this Agreement.

                 14.  Counterparts.  This Agreement may be executed in separate
counterparts, each of which shall be deemed an original.

                           *     *     *     *     *

                 IN WITNESS WHEREOF, the parties hereto have executed this
Agreement as of the date first above written.


                         MOTOROLA, INC.
                    
                    
                    
                         By:    /s/ Durrell Hillis            
                             ---------------------------------
                    
                         Its:    Corporate Vice  President and General
                                 Manager
                    
                         IRIDIUM, INC.
                    
                    
                    
                         By:     /s/ Jerrold D. Adams      
                              -----------------------------
                    
                         Its:    President and Chief Operating Officer
                    




                                      -4-
<PAGE>   5
                                                                    EXHIBIT A TO
                                                               SUPPORT AGREEMENT


                               SECONDED EMPLOYEES

                               Jerrold D. Adams
                               Elaine Almgren
                               Annette Baretincic
                               Steven Cheston
                               Gordon J. Cornerford
                               Richard Everett
                               James Foley
                               Mark Gercenstein
                               Laurence Groberg
                               Dan Hernandez
                               Robert W. Kinzie
                               Juan H. Macias
                               Leo Mondale
                               Julia Osborne





                                      -5-
<PAGE>   6
                                                                    EXHIBIT B TO
                                                               SUPPORT AGREEMENT



                                OTHER EMPLOYEES

                                William English
                                Robert Pizzimenti
                                Emeric Podraczky
                                John Windolph





                                      -6-
<PAGE>   7
                      AMENDMENT NO. 1 TO SUPPORT AGREEMENT


                 THIS AMENDMENT NO. 1 TO STOCK PURCHASE AGREEMENT is dated  as
of July 26, 1993 and is by and between Iridium, Inc., a Delaware corporation
("Iridium"), and Motorola, Inc., a Delaware corporation ("Motorola").

                 WHEREAS, the parties hereto are parties to a Support Agreement
dated as of July 15, 1992 (the "Support Agreement") pursuant to which, among
other things, Motorola and Iridium memorialized their agreements as to the
services provided, and to be provided, to Iridium and the payments to be made
by Iridium to Motorola for such services;

                 WHEREAS,  the initial offering of Iridium stock to investors
pursuant to the Stock Purchase Agreement dated as of July 19, 1993 (the "Stock
Purchase Agreement") is scheduled to close on July 29, 1993 and the parties
wish to amend the Support Agreement in connection with such closing;

                 NOW, THEREFORE, the parties hereto agree as follows:

                 1.       Amendments to Support Agreement.  The Support
Agreement is hereby amended as follows:

                 1.1      Paragraph 1 of the Support Agreement is hereby
amended to add the following at the end thereof:

                 "(c)     In addition to retaining the foregoing advisors,
                 Motorola has or will retain legal counsel in countries other
                 than the United States for the purpose of obtaining advice
                 with respect to the potential participation of non-United
                 States companies in Iridium's offering of equity securities
                 and Iridium hereby ratifies and approves Motorola's retention
                 of such legal counsel for such purposes and agrees to
                 reimburse Motorola on demand for the fees, expenses and other
                 charges of such counsel in connection with services performed
                 by them at Motorola's or its counsel's request in such regard,
                 regardless of whether companies from the countries with
                 respect to which such advice is sought actually participate in
                 Iridium's offering of equity securities."

                 1.2      Paragraph 6 of the Support Agreement is hereby
amended to add the following at the end thereof:

                 "Iridium shall also indemnify and hold Motorola harmless from
                 and against (I) any liability arising out of claims that
                 Motorola has liabilities or





<PAGE>   8
                 obligations to any employee of Iridium, as a co-employer or
                 otherwise (except with respect to claims arising out of
                 periods during which such employee was a direct employee of
                 Motorola) and (ii) any liability arising out of claims by
                 others that Motorola has liabilities or obligations to them
                 arising out of the acts, omissions or status of any employee
                 of Iridium (except with respect to claims arising out of
                 periods during which such employee was a direct employee of
                 Motorola and not seconded to Iridium pursuant to this
                 Agreement) or of any employee of Motorola who has been
                 seconded to Iridium (only with respect to claims arising out
                 of periods during which such employee was seconded to
                 Iridium)."

                 1.3      Paragraph 7 of the Support Agreement is hereby
amended to read in its entirety as follows:

                 "7.      Access; Post-Closing Cooperation.  Iridium shall
                 provide Motorola such access to its properties as is necessary
                 or desirable for Motorola to provide the services contemplated
                 by this Agreement.  Iridium and Motorola agree that each of
                 the Seconded Employees and such Iridium personnel as Iridium
                 deems appropriate may continue to be employees of Motorola for
                 a transition period after the Closing (as defined in the Stock
                 Purchase Agreement dated as of July 19, 1993 to which Iridium,
                 Motorola and certain investors in Iridium are a party (the
                 "Stock Purchase Agreement")) of between two weeks and nine
                 months after the Closing and Iridium and Motorola shall
                 cooperate in this regard and agree that paragraph 3 hereof
                 shall apply with respect to such Seconded Employees and such
                 other Iridium personnel.  In addition, in recognition of the
                 fact that Motorola will likely become a Covering investor (as
                 defined in the Stock Purchase Agreement), Iridium hereby
                 agrees to fully cooperate with Motorola, at Iridium's sole
                 cost and expense, in Motorola's effort to sell any Iridium
                 shares that Motorola purchases as a Covering investor and to
                 assign any and all rights and obligations associated with such
                 shares.  Such cooperation shall include, without limitation,
                 (i) assisting Motorola in preparing written and oral
                 disclosures to prospective purchasers of such shares of
                 information relating to Iridium and its business, (ii) having
                 Iridium personnel meet with prospective purchasers and make
                 presentations to them regarding Iridium and its business,
                 (iii) providing Motorola with access to Iridium's books and
                 records and (iv) cooperating with Motorola in the production
                 and execution of documents required or advisable in Motorola's
                 judgment to consummate a transfer of Iridium shares by
                 Motorola to any such purchaser.  Iridium shall also indemnify
                 defend and hold harmless Motorola and its directors, officers,
                 employees and agents from and against the entirety of any
                 losses, claims, damages, liabilities and expenses asserted
                 against or imposed upon or





                                      -2-
<PAGE>   9
                 incurred by any of them arising out of, based upon or caused
                 by any untrue or alleged untrue statement of material fact
                 contained in any disclosures or written information provided
                 by or on behalf of Iridium of the kind described in the
                 foregoing sentence or any omission or alleged omission of a
                 material fact required to be stated in any of such disclosures
                 or written information or necessary to make the statements
                 therein not misleading."

                          1.4     Paragraph 8 of the Support Agreement is
        hereby amended to delete the phrase "paragraph 6 hereof" therein and 
        replace it with the phrase "paragraphs 6 and 7 hereof".

                 2.       No Further Effect.  Each of the parties hereto hereby
ratifies and confirms all of its liabilities and obligations under the Support
Agreement and agrees that the Support Agreement continues in full force and
effect as modified in this Amendment. All references in the Support Agreement
to "this Agreement" shall be deemed to refer to the Support Agreement as
amended by this Amendment.

                 3.       Counterparts.  This Amendment may be executed
simultaneously in two or more counterparts, any one of which need not contain
the signatures of more than one party, but all such counterparts taken together
shall constitute one and the same Amendment.

                 IN WITNESS WHEREOF, the parties hereto have executed this
Amendment as of the date first written above.

                              IRIDIUM, INC.
                       
                       

                              By:  /s/ JERROLD D. ADAMS
                                 --------------------------------
                       
                              Its: President and Chief                  
                                   ------------------------------
                                   Operating Officer
                       
                       

                              MOTOROLA, INC.
                       
                       
                       
                              By:                                
                                 --------------------------------
                       
                              Its:                               
                                  -------------------------------
                       




                                      -3-

<PAGE>   1

                                                                 EXHIBIT 10.14


                                   FORM OF
                        GATEWAY AUTHORIZATION AGREEMENT



                 THIS AGREEMENT effective this 31st day of December 1994, by
and between (co. name) (herein referred to as "Investor") and Iridium, Inc., a
Delaware corporation (herein referred to as the "Company"), both together
referred to herein as the "Parties".

                 WHEREAS, the Company and Investor, together with other
investors in the Company, have entered into  stock purchase agreements dated as
of (date) (herein "SPAs") to enable the Company to procure, operate and own the
Space System of the IRIDIUM(R) Communications System;

                 WHEREAS, the SPAs grant to Investor certain Gateway rights and
Service Provider rights and allocate to Investor certain Gateway Service
Territories, which rights and allocations are subject to the timely fulfillment
of various obligations;

                 WHEREAS, the Company and Investor desire to enter into this
Agreement for the purpose of describing in more detail these various rights and
obligations of Investor, as well as those of the Company, with the objective of
ensuring that the IRIDIUM Communications System achieves fully integrated and
timely operation;

                 NOW, THEREFORE, the Parties hereto agree as follows:

                                   ARTICLE I
                                  DEFINITIONS

                 The capitalized terms and phrases used in this Agreement shall
have the meaning set forth in Section 1, entitled "Certain Definitions", of the
SPAs; in Article 1, entitled "Definitions", of the Space System Contract
between the Company and Motorola, Inc. ("Motorola") effective as of July 29,
1993; or in Article 1, entitled "Definitions", of the Operations and
Maintenance Contract between the Company and Motorola effective as of July 29,
1993. Additional capitalized terms and phrases are defined where first used
within this Agreement. An index to such definitions is set forth below.

                 "Clearinghouse" or "IRIDIUM Clearinghouse" is described in 
                 Article IV.

                 "Gateway Configuration" is defined in paragraph 2.3.

                 "Gateway Implementation Plan" is defined in paragraph 2.3.

                 "Gateway Master Plan" is defined in paragraph 2.3.

                 "Gateway Services" means the services provided by a Gateway or
                 Gateways constructed in accordance with the Gateway Interface
                 Specification and would include but not be limited to
                 supporting the subscriber billing/information functions





                                       1
<PAGE>   2
                 in addition to call processing operations and the connection
                 of the IRIDIUM subscriber communications through the public,
                 switched, telephone network (PSTN).

                 "IRIDIUM System Practices" or "ISP" means the set of
                 guidelines, recommendations, rules, plans and other
                 instructions related to technical and operational matters
                 associated with operation of the IRIDIUM Communications
                 System. In order to secure a high degree of network integrity
                 and robustness, some technical and operational portions of
                 these practices are intended to be mandatory and other
                 portions are intended to be recommendations. The ISP will be
                 consistent with applicable decisions and directives of the
                 Iridium Board of Directors and will, in all relevant respects,
                 be developed in consultation with Investor. To the extent that
                 a proposed ISP or a proposed amendment to an existing ISP
                 imposes material obligations on Gateway Operators and/or
                 Service Providers, a reasonable consensus must be reached
                 among investors which have been allocated Gateway Service
                 Territories and the Company prior to approval of the ISP.

                 "Net Settlement Position" is defined in paragraph 4.2.

                 "Network Implementation Plan" is referred to in paragraph 2.1.

                 "Proprietary Information" is defined in paragraph 7.3.1.

                                   ARTICLE II
                          UNDERTAKINGS OF THE PARTIES

GATEWAY CONSTRUCTION AND OPERATIONS

                 2.1      The Company will provide to Investor the proposed
IRIDIUM Communications System Network Implementation Plan which will set forth,
among other things, the proposed construction and operational schedules for
each authorized IRIDIUM Gateway, including Investor's Gateway or Gateways. An
objective of the Network Implementation Plan will be to ensure that the key
ground components of the IRIDIUM Communications System will achieve fully
tested on-line operations commensurate with the completion date of the IRIDIUM
Space System as defined by the completion of Milestone 47 in the Space System
Contract.

                 2.2      The successful and reliable operation of the IRIDIUM
Communications System requires the co-operation of Gateway Operators, Service
Providers, and the Company as well as clearly defined technical interfaces and
division of operational and business responsibilities. The Company will use its
best efforts in cooperation with Investor to define and reach agreement about
the relevant and appropriate interface specifications.

                 2.3      The portions of the Network Implementation Plan
setting forth the specific aspects of Investor's Gateway(s), and any subsequent
material midifions thereto, will be finalizalizy mutual agreement of the Coe
Coy and Investor, taking into nto unt, amo





                                       2
<PAGE>   3
%
her things, suc suclevant cnt criteria as cost and availability of
interconnection to an international switching center and the PSTN, local and
national legal and regulatory requirements, and suitable land availability and
cost. To facilitate the achievement of such mutual agreement, the Company and
Investor will use their reasonable best efforts to promptly agree upon the
specifics of Investor's Gateway(s), including (i) the specific location of
Investor's Gateway(s) within Investor's allocated Gateway Service Territories,
which will become elements of the Iridium network topology plan, (ii) the
communications capacity of each Gateway (the "Gateway Configuration") and (iii)
the specific construction and operational schedule for each Gateway ( the
"Gateway Implementation Plan"). Investor and the Company hereby agree that
Investor shall locate a Gateway(s) in (location) and that Investor shall use
its reasonable best efforts to have such Gateway(s) operational approximately
six months in advance of the scheduled completion date of Milestone 47 as
reflected in Exhibit A to the Space System Contract (currently December 23,
1998). Such locations and operational dates may be modified by Investor in
accordance with the Gateway Implementation Plan agreed to by Investor and the
Company. The agreed upon Gateway Configuration and the Gateway Implementation
Plan are hereinafter referred to as the "Gateway Master Plan".

                 2.4      Investor will use its reasonable best efforts to
undertake and complete on a schedule consistent with the Gateway Master Plan,
and in compliance with applicable governmental regulatory requirements, the
following:

                 2.4.1    apply for, obtain and maintain all governmental
                          authorizations and frequency allocations necessary to
                          (i) construct and operate Investor's Gateway(s) on a
                          schedule consistent with the Gateway Master Plan and
                          (ii) provide Gateway Services in each of Investor's
                          Gateway Service Territories;

                 2.4.2    contract with Motorola and/or other suppliers to
                          design, construct and maintain Investor's Gateway in
                          accordance with the Gateway Master Plan, Network
                          Implementation Plan, and the IRIDIUM System
                          Practices;

                 2.4.3    provide for the staffing, testing and operation of
                          the Gateway(s) in accordance with the ISP as it may
                          be modified from time to time, relevant elements of
                          which will be provided to Investor on a schedule
                          consistent with the Gateway Master Plan, including
                          timely notification of changes to the ISP by the
                          Company;

                 2.4.4    consistent with the applicable requirements of the
                          ISP, establish and maintain appropriate
                          interconnection, access and settlement arrangements
                          through and with such international or other
                          appropriate switching centers as may be required to
                          originate calls from and terminate calls to each
                          public switched telephone network (hereinafter
                          "PSTN") operating within Investor's allocated Gateway
                          Service Territories, as well as such other
                          interconnection arrangements as may be required to
                          effectively distribute and utilize IRIDIUM
                          Communications Services within Investor's allocated
                          territories; and





                                       3
<PAGE>   4
                  2.4.5   provide Gateway Services to its designated Service
                          Providers in each of its allocated Gateway Service
                          Territories.

                  2.5     If requested and under terms and conditions to be
agreed between Investor and the Company, the Company will provide or arrange
for the provision of certain services to assist Investor in the performance of
the undertakings set forth in Section 2.4, above. Examples of these services
are set forth in Annex A hereto.

SERVICE PROVISION

                  2.6     Investor will designate, contract with and supervise
a Service Provider or Service Providers, and/or itself act as a Service
Provider, in each of Investor's Gateway Service Territories for the purpose of
distributing IRIDIUM Communications Services and, where applicable, IRIDIUM
Subscriber Units within those territories. Investor will require each of its
designated Service Providers to comply with applicable policies and practices
set forth in the ISP.

                  2.7     Investor, when acting as a Service Provider, will use
its reasonable best efforts, and, if so agreed and when necessary, will also
require each of its designated Service Providers to use their reasonable best
efforts to obtain and maintain all legal and regulatory authorizations
necessary to provide IRIDIUM Communications Services within their respective
allocated territories, including authorization to carry (including
transborder), operate and use IRIDIUM Subscriber Units.

                  2.8     The Company will provide to Investor in support of
the performance of its undertakings set forth in Sections 2.4.5 and 2.6, above,
on a schedule consistent with the Gateway Master Plan, information with respect
to recommended policies and practices applicable to the selection of Service
Providers and service provision, including suggested global or regional
promotional programs that could be administered on a centralized basis by the
Company (see examples in Annex B hereto).

 ACCESS TO THE IRIDIUM SPACE SYSTEM

                  2.9     The coverage and performance characteristics of the
IRIDIUM Space System shall be as delivered to and accepted by the Company in
accordance with the terms of the IRIDIUM Space System Contract and as
maintained under the terms of the IRIDIUM Operations and Maintenance Contract
or any successor contracts for an IRIDIUM space system and the operation and
maintenance thereof.

                  2.10    The Company shall provide Investor, including its
designated Service Providers, continuous access to the IRIDIUM Space System, in
the form of minutes of use or fractions thereof, commencing at such time as
Investor's Gateway has been constructed, tested and commissioned in accordance
with the Gateway Master Plan and can be demonstrated to the Company to be in
full and satisfactory compliance with the applicable mandatory provisions of
the ISP and all other applicable terms of this Agreement.  This right of
continuous access shall be subject to maintaining full and satisfactory
compliance with the applicable mandatory and material provisions of the ISP,





                                       4
<PAGE>   5
this Agreement and the SPA. The ISP, and the Company in the administration of
the ISP, will provide Investor with specific test criteria and guidance with
respect to the operation of the Investor's Gateway in order to assess such
compliance with the ISP. Such test criteria and guidance shall be supplied to
Investor sufficiently in advance of the dates upon which Investor's Gateway is
expected to comply with the ISP so that Investor has a reasonable opportunity
to bring its Gateway into compliance.

                  2.11    Any transmission to or other use of the Space System
by Investor's Gateway or by any of its designated Service Providers, or their
respective customers, will comply with all applicable and material governmental
rules and regulations and with the applicable mandatory provisions of the ISP
in order to maintain the operating integrity of the IRIDIUM Communications
System. In the event that Investor fails to maintain the Gateway in substantial
compliance with the applicable mandatory provisions of the ISP, then the
Company shall promptly notify Investor of the deficiency. Investor shall take
such action as may be required, in light of the nature of the deficiency, to
eliminate the deficiency within a reasonable time. Investor and the Company
recognize that certain deficiencies may require immediate action to maintain
the integrity and continued operation of the IRIDIUM Communications System.
When, in the Company's reasonable judgement, such action is required, Investor
will comply with instructions of the Company, which may include cessation of
Gateway transmissions or other appropriate actions. The Company shall have the
right to suspend access to the IRIDIUM Space System if the Company reasonably
determines that such continued access would harm overall system operation and
either a) Investor has failed to take previously requested corrective action or
b) the need for immediate action by the Company is required to avoid harm to
overall system operation. When the Company has determined the need for such
immediate action to be taken it will, to the extent practicable, provide
advance notice of such immediate action, but in any event will provide at least
concurrent notice thereof. Such notice will provide the basis for the
determination by the Company that such immediate action is required.

                  2.12    Investor will use its reasonable best efforts to
ensure that its Gateway and, to the extent practicable, any Subscriber Unit
issued by its designated Service Providers operate under specified rules and
commitments that allow the Company to implement the provisions of this
Agreement, including, specifically, Section 2.11, above.

                                  ARTICLE III
                         PRICING POLICIES AND PRACTICES

                  3.1     The Board of Directors of the Company will establish
the pricing policies and practices, including specific rates, and currency
requirements (taking into account the effect of currency fluctuations)
governing access to the IRIDIUM Space System. Initial pricing policies and
practices will be supplied to Investor sufficiently in advance of the date upon
which the IRIDIUM Communications System becomes operational for them to be
implemented by Investor. Any pricing policies and recommendations of the
Company will be developed on the basis of prior consultation with Investor.
Notice of any change in pricing policies and practices shall be given to
Investor no less than sixty (60) calendar days in advance of its effective
date. Investor will comply with these pricing policies and practices to the
extent permitted by applicable law and regulation.





                                       5
<PAGE>   6
                  3.2     The Investor shall cooperate with the Company in
developing and implementing pricing policies, revenue sharing, and distribution
plans which are applicable to the IRIDIUM Communications System.

                                   ARTICLE IV
                            THE IRIDIUM CLEARINGHOUSE

                  4.1     The Company will use its reasonable best efforts to
establish and have operational the IRIDIUM Clearinghouse function on or before
the operational date of the IRIDIUM Communications System. The Clearinghouse
function will be developed in consultation with Investor. The Clearinghouse
function will be designed and operated primarily to:

                  4.1.1   serve as the central point for collection of all call
                          detail records produced within the network;

                  4.1.2   provide the services of correlation, wholesale
                          rating, and re-distribution of the call detail 
                          records;

                  4.1.3   calculate the Net Settlement Position (defined in
                          4.2, below) among each of Iridium, Inc. and all
                          Gateway operators;

                  4.1.4   execute the net settlements; and

                  4.1.5   serve as the publication and distribution
                          organization for various IRIDIUM Communications
                          Services publications.

                  4.2     Net Settlement Position is determined by calculating
the amount owed by every IRIDIUM business entity (Iridium itself and every
Gateway operator) to every other IRIDIUM business entity. Amounts owed by each
entity to another entity are then netted out so as to minimize the number of
payments which must be made.

                  4.3     The Clearinghouse may also provide additional
services that Investor may request from time to time on an as-available basis
under supplemental agreement, including fee, agreed to between the Company and
Investor. Such additional services may include calculation of the Net
Settlement Position among Investor, its designated Service Providers, the
Authorized Entities and, where feasible, its Interconnected Carriers and may
also include provision of a funds management service required for the
implementation of the Net Settlements.

                                   ARTICLE V
                             REPORTING REQUIREMENTS

                  5.1     In order to provide the Company with timely data
necessary to manage the IRIDIUM Communications System, including the functions
of the Clearinghouse, information which includes, but is not limited to, the
following will be provided by Investor in the form, content and frequency
specified in the ISP: call detail records and other





                                       6
<PAGE>   7
network statistics as recorded in Investor's Gateway; operating and financial
data and information, including number of subscribers and users; number of new
and discontinued subscribers and users; number of subscriber units sold or in
use by type; total minutes of use; dropped calls; and, where applicable, number
of debit cards sold and face value thereof. Such data and information will be
made available only to Investor and to others designated by Investor, upon
reasonable request, but only with the consent of the providing Investor.

                                   ARTICLE VI
                GLOBAL SPECTRUM ALLOCATIONS AND OTHER ITU ISSUES

                  6.1     In the interest of ensuring that the IRIDIUM
Communications System, including its space and ground components, receives
sufficient allocations of interference-free radio frequency spectrum,
Investor, with the cooperation and support of the Company, will use its
reasonable best efforts, as provided for in the SPAs, to obtain from the
government of each jurisdiction within its Gateway Service Territories
allocations of the frequencies necessary to operate and use the IRIDIUM
Communications System, including requesting the governments of each
jurisdiction within Investor's Gateway Service Territories to support
Company-approved positions at World Radio Communication Conferences of the
International Telecommunication Union and to facilitate the coordination and
use of frequencies allocated to the System.

                  6.2     In the interest of ensuring that the IRIDIUM
Communications System is able to operate fully and effectively, Investor, with
the cooperation and support of the Company, will use its reasonable best
efforts to support Company-approved positions, including, but not limited to,
assignment of a country code for the IRIDIUM Communications System, at the
International Telecommunication Union and other relevant bodies and shall use
its reasonable best efforts to secure the support of the government of each
jurisdiction within its Gateway Service Territories for such positions.

                                  ARTICLE VII
                               GENERAL PROVISIONS

 7.1             RESOLUTION OF DISPUTES

                  7.1.1   In the event of any dispute arising under this
                          Agreement, including any allegation of breach and any
                          failure to reach mutual agreement hereunder, the
                          parties shall refer the matter for consideration and
                          solution by the responsible executives of the
                          parties. Either party may commence such proceedings
                          by delivering to the other party a written request
                          for such a meeting. Such request shall describe the
                          dispute and identify the requesting party's
                          responsible executive for purposes of resolving the
                          dispute. The party receiving such a request shall
                          have seven (7) calendar days to designate in writing
                          to the requesting party its responsible executive for
                          the purpose of resolving the dispute. The responsible
                          executives shall meet within thirty (30) calendar
                          days at such time and location as may be mutually
                          agreed to resolve the dispute. The responsible
                          executives shall use their reasonable





                                       7
<PAGE>   8
                          best efforts to resolve the dispute within fourteen 
                          (14) calendar days following their meeting.

                  7.1.2   If the responsible executives are unable to resolve
                          the dispute they shall propose a mechanism for
                          resolving the dispute. Such mechanism may include
                          mediation or any other means of resolution. If the
                          responsible executivee unabl o agreagree on a
                          mechanism for dispute resolution or if the mechanism
                          used does not result within a reasonable time in a
                          binding decision, the dispute shall be settled by
                          arbitration.

                  7.1.3   Any arbitration of the dispute shall be conducted in
                          Stockholm, Sweden in accordance with the Rules of the
                          Arbitration Institute of the Stockholm Chamber of
                          Commerce with instructions that the arbitration be
                          conducted in the English language. The arbitration
                          award shall be final and binding on the parties and
                          shall be enforced in accordance with its terms. The
                          arbitration fee shall be borne by the party as
                          designated by the arbitration award. In the course of
                          such arbitration, this Agreement shall be
                          continuously performed except with respect to the
                          part hereof which is the subject of, or which is
                          directly and substantially affected by, the
                          arbitration. In any such arbitration proceeding, any
                          legal proceeding to enforce any arbitration award and
                          any other legal action between or among the parties
                          pursuant to or relating to this Agreement or the
                          transactions contemplated hereby, Investor expressly
                          waives the defense of sovereign immunity and any
                          other defense based on the fact or allegation that it
                          is an agency or instrumentality of a sovereign state.
                          Any award of the arbitrators shall be enforceable by
                          any court having jurisdiction over the party against
                          which the award has been rendered and such award
                          shall be enforceable in accordance with the United
                          Nations Convention on the Reciprocal Enforcement of
                          Arbitral Awards (1958).

 7.2              LIMITATION OF LIABILITY

                  Neither the Company nor Investor, nor any director, officer
                  or employee of either, nor any representative or agent of
                  either acting in the performance of their functions, shall be
                  liable to any Investor or to the Company, nor shall any claim
                  be made against any of them, for injury, loss or damage
                  sustained by reason of any unavailability, delay, faultiness
                  or failure of the facilities and services provided or to be
                  provided by the Company or by Investor pursuant to or as a
                  result of this Agreement.

 7.3              DISCLOSURE AND USE OF INFORMATION BY THE PARTIES

                  7.3.1   "Proprietary Information" is defined as information
                          which the disclosing party at the time of disclosure
                          identifies in writing as Proprietary Information by
                          means of a proprietary legend, marking, stamp or
                          other positive written notice identifying the
                          information to be proprietary. In order for
                          information disclosed orally or visually by a party
                          to this Agreement to be Proprietary Information
                          protected hereunder, the disclosing party shall
                          identify the





                                       8
<PAGE>   9
                          information as proprietary at the time of the
                          disclosure and, within fourteen (14) calendar days
                          after such oral or visual disclosure, reduce the
                          subject matter of the disclosure to writing, properly
                          stamped with the proprietary legend, marking, stamp
                          or other positive written notice and submit it to the
                          receiving party.

                  7.3.2   It is agreed that for a period of ten (10) years
                          following the receipt of Proprietary Information, the
                          receiving party will use such information only for
                          the purposes provided for in this Agreement and shall
                          take reasonable efforts to preserve in confidence
                          such Proprietary Information and prevent disclosure
                          thereof to third parties. Each of the parties agree
                          that it will use the same reasonable efforts to
                          protect the other's Proprietary Information as are
                          used to protect its own but will at least use
                          reasonable care.  Disclosures of such information
                          shall be restricted to those individuals who have a
                          need to know such information and who have been made
                          aware of and consent to abide by the restrictions
                          contained herein concerning the use of such
                          information.

                  7.3.3   The obligation to protect Proprietary Information,
                          and the liability for unauthorized disclosure or use
                          of Proprietary Information, shall not apply with
                          respect to: such information which is now available
                          or becomes available to the public without breach of
                          this Agreement; information received without
                          restrictions from other sources (so long as the
                          receiving party had no reason to believe that the
                          information was obtained by illegal means);
                          information known to the receiving party prior to
                          disclosure and not subject to a separate
                          non-disclosure obligation; information published or
                          disclosed by the disclosing party to others, without
                          restriction; information developed by the receiving
                          party independent of and without use of the
                          information disclosed by the disclosing party;
                          information for which further use or disclosure by
                          the recipient is authorized in writing by the
                          disclosing party; information required to be
                          disclosed to any persons involved in insuring risks
                          hereunder; or information required to be disclosed
                          pursuant to an order of a governmental entity,
                          provided, however, that the party receiving such an
                          order shall submit the requested information under
                          procedures, if available, which will avoid public
                          disclosure of the information.

 7.4             TRADEMARKS

                 Any proposed use of the trademarks, trade names, and service
                 marks owned by the Company shall only be undertaken in
                 accordance with the IRIDIUM Guidelines and Style Manual, which
                 will be prepared and distributed by the Company independently
                 of this Agreement.

 7.5             GOVERNMENT MATTERS





                                       9
<PAGE>   10
                 7.5.1    All undertakings and obligations assumed hereunder by
                          either party are subject to the issuance and
                          continuance of all necessary governmental licenses,
                          waivers, consents, registrations, permissions and
                          approvals.

                 7.5.2    Whenever possible, each provision of this Agreement
                          shall be interpreted in such manner as to be
                          effective and valid under applicable law, but if any
                          provision of this Agreement is held to be prohibited
                          by or invalid under applicable law such provision
                          shall be ineffective only to the extent of such
                          prohibition or invalidity, without invalidating the
                          remainder of this Agreement.

                 7.5.3    Except for taxes based upon profits of the Company
                          arising from the Company doing or determined by law
                          to be doing business within any of Investor's
                          allocated territories, the Company will not be
                          responsible or liable for taxes which may be imposed
                          in any of the territories allocated to Investor
                          arising from any of the services provided or derived
                          from the services provided under this Agreement, and
                          Investor shall indemnify and hold the Company
                          harmless from any such taxes, fees, import duties, or
                          other similar charges that may be so imposed upon the
                          Company.

7.6              ASSIGNMENT

                 This Agreement, including both rights and obligations conveyed
                 hereunder, may not be assigned by either party without the
                 prior written consent of the other party except as provided
                 for in the SPAs. Either party may carry out its
                 responsibilities hereunder through the use of third parties,
                 including joint venture companies established for the purpose
                 of financing and operating a Gateway and distributing IRIDIUM
                 services. However, the party performing its obligations and
                 responsibilities in such manner shall remain obligated for
                 performance hereunder.

7.7              NOTICES

                 All notices and other communications provided for in this
                 Agreement shall be in writing, shall be in the English
                 language, and shall be sufficiently given if made by hand
                 delivery, by telecopier (but only if such notice is also sent
                 by one of the other means described herein), by reputable
                 express courier service charges prepaid, or by registered or
                 certified mail, postage prepaid and returned receipt
                 requested. All such notices and other communications shall be
                 deemed duly to have been given: when delivered by hand, if
                 personally delivered; five (5) business days after being
                 deposited with a reputable express courier service, charges
                 prepaid sent by express cT"; se; se(7) business days after
                 beinbeinposited in the mail, postagetagepaid, if delivered by
                 mail; il; when receipt ipt is acknowledged by the recipient,
                 if telecopied. Notices shall be sent to Iridium at Suite 800,
                 1401 H Street NW, Washington, DC 20005, USA, Attn: V.P.
                 Network Operations; telecopier +1.202.842.0006. Notices to
                 Investor shall be sent to the address and telecopier specified
                 in accordance with Investor's SPAs. Either party may by notice
                 properly given change the address and telecopier number to
                 which notice is to be sent. Business days shall be calculated
                 in accordance with practices at the destination of the notice.





                                       10
<PAGE>   11
7.8              GOVERNING LAW

                 The governing law of this agreement shall be the law of the
                 jurisdiction specified in the section entitled "Governing Law"
                 of the SPAs.

7.9              ENTIRE AGREEMENT

                 Except as provided in this section 7.9, this Agreement
                 constitutes the entire agreement among the parties with
                 respect to its subject matter. It supersedes any
                 understandings, agreements, or representations by the parties,
                 written or oral, made prior to the time this Agreement is
                 entered into, except that it shall not supersede the SPAs. In
                 the event of any conflict between this Agreement and the SPAs,
                 the SPAs shall control except that the resolution of disputes
                 shall be conducted as provided for herein.

7.10             NOTIFICATION OF MODIFICATIONS

                 A copy of each gateway authorization agreement executed with
                 the Company shall be sent to Investor and any modification of
                 such agreement shall be noticed, in writing, to Investor.

                 IN WITNESS WHEREOF, the undersigned have executed this
Agreement on the day and year indicated and first above written.

COMPANY:                                  INVESTOR:

By:                                        By:
   -------------------------------------      ------------------------------

Its: Vice President, Business Operations   Its:
     -----------------------------------       -----------------------------





                                       11
<PAGE>   12
                        GATEWAY AUTHORIZATION AGREEMENT

                                    ANNEX A


Examples of the types of services that could be agreed upon between the Company
and Investor include the following:

                 1.       Staffing requirements by function, including job
                          descriptions and recommendations for staffing levels
                          relative to customer service, MIS, marketing and
                          operations.

                 2.       Training and support relative to implementation of 
                          IRIDIUM System Practices.

                 3.       Planning, negotiation and implementation of
                          interconnect arrangements.

                 4.       Refinement of traffic models and subscriber
                          projections as a basis for proper sizing of the
                          Gateway.

                 5.       The creation of a plan to obtain the appropriate
                          licenses and spectrum needed to commission and
                          operate the Gateway.





                                       12
<PAGE>   13
                        GATEWAY AUTHORIZATION AGREEMENT

                                    ANNEX B


Examples of recommended policies and practices that the Company could provide
to Investor in support of Section 2.8 are:

                 1.       Recommend Service Provider staffing by function,
                          including guidelines with respect to the suggested
                          ratio of sales people and/or customer service, and/or
                          credit and collection, to subscriber count.

                 2.       Recommend promotional budgets, cooperative
                          advertising programs, and other initiative designed
                          to reward star Service Providers.

                 3.       Provide sample agreements which may be used between
                          Investor and its Service Providers.

                 4.       Assist in the identification of qualified Service
                          Provider candidates.

                 5.       Establish target industries and/or companies for
                          penetration based upon (a) global account contacts
                          and/or (b) minutes of use programs which call for
                          corporate discounts based upon usage thresholds.

The Company will also propose for Investor's consideration various discount
pricing approaches designed to stimulate use of the IRIDIUM Communications
System. Such discounts can be based upon several variables, including
achievement, in any given year, of specified minimum use objectives or
thresholds which if achieved would lead to a discount on additional billable
minutes of use.





                                       13

<PAGE>   1
                                                                EXHIBIT 10.15
                                                                        ------

                                                         [EXECUTION COUNTERPART]





       ==================================================================


                                  IRIDIUM LLC

                             ---------------------


                                CREDIT AGREEMENT


                          Dated as of August 21, 1996


                             ----------------------

                                  $750,000,000

                            -----------------------



                             CHASE SECURITIES INC.
                                      and
                     BZW, a division of BARCLAYS BANK PLC,
                              as Global Arrangers,

                           THE CHASE MANHATTAN BANK,
                            as Administrative Agent

                                      and

                               BARCLAYS BANK PLC,
                             as Documentation Agent


       ==================================================================
<PAGE>   2

                               TABLE OF CONTENTS

                 This Table of Contents is not part of the Agreement to which
it is attached but is inserted for convenience of reference only.

<TABLE>
<CAPTION>                                
                                                                                                  Page
                                                                                                  ----
    <S>                                                                                             <C>
    Section 1. Definitions and Accounting Matters . . . . . . . . . . . . . . . . . . . . .          1
         1.01  Certain Defined Terms  . . . . . . . . . . . . . . . . . . . . . . . . . . .          1
         1.02  Accounting Terms and Determinations  . . . . . . . . . . . . . . . . . . . .         15
         1.03  Types of Loans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         16
                                                                                            
    Section 2. Commitments, Loans, Revolving Credit Notes and                                   
               Prepayments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         16
         2.01  Loans  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         16
         2.02  Borrowings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         16
         2.03  Changes of Commitments . . . . . . . . . . . . . . . . . . . . . . . . . . .         17
         2.04  Commitment Fee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         17
         2.05  Lending Offices  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         17
         2.06  Several Obligations; Remedies Independent  . . . . . . . . . . . . . . . . .         17
         2.07  Revolving Credit Notes . . . . . . . . . . . . . . . . . . . . . . . . . . .         18
         2.08  Prepayments and Conversions or Continuations of                              
               Loans  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         18
                                                                                            
    Section 3. Payments of Principal and Interest . . . . . . . . . . . . . . . . . . . . .         19
         3.01  Repayment of Loans . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         19
         3.02  Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         19
                                                                                            
    Section 4. Payments; Pro Rata Treatment; Computations; Etc. . . . . . . . . . . . . . .         20
         4.01  Payments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         20
         4.02  Pro Rata Treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         21
         4.03  Computations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         21
         4.04  Minimum Amounts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         22
         4.05  Certain Notices  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         22
         4.06  Non-Receipt of Funds by the Administrative Agent . . . . . . . . . . . . . .         23
         4.07  Sharing of Payments, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . .         24
                                                                                            
    Section 5. Yield Protection, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . .         26
         5.01  Additional Costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         26
         5.02  Limitation on Types of Loans . . . . . . . . . . . . . . . . . . . . . . . .         28
         5.03  Illegality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         29
         5.04  Treatment of Affected Loans  . . . . . . . . . . . . . . . . . . . . . . . .         29
         5.05  Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         30
         5.06  U.S. Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         31
         5.07  Replacement of Lenders . . . . . . . . . . . . . . . . . . . . . . . . . . .         32
                                                                                            
    Section 6. Conditions Precedent . . . . . . . . . . . . . . . . . . . . . . . . . . . .         33
         6.01  Effectiveness  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         33
         6.02  Initial and Subsequent Loans . . . . . . . . . . . . . . . . . . . . . . . .         35
</TABLE>

        



                                      (i)
<PAGE>   3
<TABLE>  
<CAPTION>
                                                                                                  Page
                                                                                                  ----
    <S>                                                                                             <C>
    Section 7. Representations and Warranties . . . . . . . . . . . . . . . . . . . . . . .         36
         7.01  Legal Existence  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         36
         7.02  Financial Condition  . . . . . . . . . . . . . . . . . . . . . . . . . . . .         36
         7.03  Litigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         37
         7.04  No Breach  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         37
         7.05  Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         37
         7.06  Approvals  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         38
         7.07  Use of Credit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         38
         7.08  ERISA  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         38
         7.09  Taxes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         38
         7.10  Investment Company Act . . . . . . . . . . . . . . . . . . . . . . . . . . .         38
         7.11  Public Utility Holding Company Act . . . . . . . . . . . . . . . . . . . . .         39
         7.12  Capitalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         39
         7.13  Subsidiaries and Certain Investments . . . . . . . . . . . . . . . . . . . .         39
         7.14  True and Complete Disclosure . . . . . . . . . . . . . . . . . . . . . . . .         39
                                                                                            
    Section 8. Covenants of the Company . . . . . . . . . . . . . . . . . . . . . . . . . .         40
         8.01  Financial Statements Etc.  . . . . . . . . . . . . . . . . . . . . . . . . .         40
         8.02  Litigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         43
         8.03  Existence, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         44
         8.04  Insurance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         45
         8.05  Prohibition of Fundamental Changes . . . . . . . . . . . . . . . . . . . . .         45
         8.06  Limitation on Liens  . . . . . . . . . . . . . . . . . . . . . . . . . . . .         45
         8.07  Indebtedness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         47
         8.08  Investments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         48
         8.09  Restricted Payments  . . . . . . . . . . . . . . . . . . . . . . . . . . . .         49
         8.10  Lines of Business  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         49
         8.11  Transactions with Affiliates . . . . . . . . . . . . . . . . . . . . . . . .         49
         8.12  Use of Proceeds  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         50
         8.13  Certain Obligations Respecting Subsidiaries  . . . . . . . . . . . . . . . .         50
         8.14  Modifications of LLC Agreement . . . . . . . . . . . . . . . . . . . . . . .         50
                                                                                            
    Section 9. Events of Default  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         51
                                                                                            
    Section 10. The Agents  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         55
         10.01  Appointment, Powers and Immunities  . . . . . . . . . . . . . . . . . . . .         55
         10.02  Reliance by the Agents  . . . . . . . . . . . . . . . . . . . . . . . . . .         56
         10.03  Defaults  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         57
         10.04  Rights as a Lender  . . . . . . . . . . . . . . . . . . . . . . . . . . . .         57
         10.05  Indemnification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         58
         10.06  Non-Reliance on the Agents and Other Lenders  . . . . . . . . . . . . . . .         58
         10.07  Failure to Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         59
         10.08  Resignation or Removal of the Agents  . . . . . . . . . . . . . . . . . . .         59
         10.09  Consents under Other Credit Documents . . . . . . . . . . . . . . . . . . .         60
                                                                                            
    Section 11. Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         60
         11.01  Waiver  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         60
         11.02  Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         60
         11.03  Expenses, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         60
         11.04  Amendments, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         61
         11.05  Successors and Assigns  . . . . . . . . . . . . . . . . . . . . . . . . . .         62
</TABLE> 
         
         
         
         
         
                                      (ii)
<PAGE>   4
<TABLE>
<CAPTION>
                                                                                                  Page
                                                                                                  ----
         <S>                                                                                        <C>
         11.06  Assignments and Participations  . . . . . . . . . . . . . . . . . . . . . .         62
         11.07  Survival  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         64
         11.08  Captions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         65
         11.09  Counterparts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         65
         11.10  Governing Law; Submission to Jurisdiction . . . . . . . . . . . . . . . . .         65
         11.11  Waiver of Jury Trial  . . . . . . . . . . . . . . . . . . . . . . . . . . .         65
         11.12  Treatment of Certain Information;                                           
                Confidentiality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         66
</TABLE> 



                                   SCHEDULES

SCHEDULE I   -  Commitments
SCHEDULE II  -  Applicable Lending Offices & Addresses for
                    Notices
SCHEDULE III -  Litigation
SCHEDULE IV  -  LLC Membership Interests & Equity Rights
SCHEDULE V   -  Investments
SCHEDULE VI  -  Indebtedness


                         EXHIBITS
                
EXHIBIT A -     Form of Revolving Credit Note
EXHIBIT B -     Form of Motorola Guarantee Agreement
EXHIBIT C -     Form of Opinion of Counsel to
                  the Company
EXHIBIT D-1 -   Form of Opinion of Counsel to Motorola, Inc.
EXHIBIT D-2 -   Form of Opinion of Special New York Counsel to
                Motorola, Inc.
EXHIBIT E -     Form of Opinion of Special New York
                  Counsel to the Global Arrangers
EXHIBIT F -     Form of Assignment and Acceptance
EXHIBIT G -     Form of Confidentiality Agreement
                




                                     (iii)
<PAGE>   5
                           CREDIT AGREEMENT dated as of August 21, 1996, among:

                           IRIDIUM LLC, a limited liability company duly
         organized and validly existing under the laws of the State of Delaware
         (the "Company"; references herein to the Company relating to any time
         prior to July 29, 1996 being references to Iridium, Inc., a Delaware
         corporation and predecessor of Iridium LLC);

                           each of the lenders that is a signatory hereto
         identified under the caption "LENDERS" on the signature pages hereto
         and each lender that becomes a "Lender" after the date hereof pursuant
         to Section 11.06(b) hereof (individually, a "Lender" and,
         collectively, the "Lenders");

                           CHASE SECURITIES INC. and BZW, a division of
         BARCLAYS BANK PLC ("BZW"), each in its capacity as arranger in respect
         of this Agreement (each in such capacity, together with its successors
         in such capacity, a "Global Arranger" and, collectively, the "Global
         Arrangers");

                           THE CHASE MANHATTAN BANK, as administrative agent
         for the Lenders (in such capacity, together with its successors in
         such capacity, the "Administrative Agent"); and

                           BARCLAYS BANK PLC, as documentation agent for the
         Lenders (in such capacity, together with its successors in such
         capacity, the "Documentation Agent").

                           The Company has requested that the Lenders make
revolving credit loans to it in an aggregate principal amount not exceeding
$750,000,000 at any one time outstanding and the Lenders are prepared to make
such loans upon the terms and conditions hereof.  Accordingly, the parties
hereto agree as follows:


                           Section 1.  Definitions and Accounting Matters.

                           1.01  Certain Defined Terms.  As used herein, the
following terms shall have the following meanings (all terms defined in this
Section 1.01 or in other provisions of this Agreement in the singular to have
the same meanings when used in the plural and vice versa):

                           "Affiliate" shall mean any Person that directly or
indirectly controls, or is under common control with, or is controlled by, the
Company. As used in this definition, "control" (including, with its correlative
meanings, "controlled by" and "under common control with") shall mean
possession, directly or indirectly, of power to direct or cause the direction





                                Credit Agreement
<PAGE>   6
                                    - 2 -

of management or policies (whether through ownership of securities or
partnership or other equity interests, by contract or otherwise), provided
that, in any event, any Person that owns directly or indirectly securities
having 10% or more of the voting power for the election of directors or other
governing body of a corporation or 10% or more of the partnership or other
equity interests of any other Person (other than as a limited partner of such
other Person) will be deemed to control such corporation or other Person.
Notwithstanding the foregoing, (a) no individual shall be an Affiliate solely
by reason of his or her being a director, officer or employee of the Company or
any of its Subsidiaries and (b) none of the Subsidiaries of the Company shall
be Affiliates of the Company.

                           "Agents" shall mean the Administrative Agent and the
Documentation Agent.

                           "Aggregate Projected Loan Amount" shall mean, as of
the date of determination thereof, the sum of: (a) the aggregate principal
amount of the Loans outstanding (including any Loans requested to be made) as
of such date (less any prepayments made on such date); (b) accrued and unpaid
interest on the Loans for the period to but excluding such date (less the
amount of any interest payments made on such date); (c) accrued and unpaid
commitment fees for the period to but excluding such date; (d) interest on the
Loans outstanding (including any Loans requested to be made) on such date
calculated (i) in the case of each Base Rate Loan, for the period from and
including such date to but excluding the next succeeding Base Rate Continuation
Date which is at least 30 days thereafter (assuming no change in the Base Rate
during such period) and (ii) in the case of each Eurodollar Loan, for the
period from and including such date to but excluding the last day of the then
current Interest Period for such Eurodollar Loan (or, in the case of any
Eurodollar Loan requested to be made on such date, the Interest Period selected
by the Company for such Loan); and (e) commitment fees calculated in accordance
with Section 2.04 hereof on the aggregate unused amount of the Commitments
(determined on and as of such date after giving effect to any Loans requested
to be made on such date) for the period from and including such date to but
excluding the next Quarterly Date which occurs at least 30 days after such date
of determination.

                           "Applicable Lending Office" shall mean, for each
Lender and for each Type of Loan, the "Lending Office" of such Lender (or of an
affiliate of such Lender) designated for such Type of Loan on Schedule II
hereto or such other office of such Lender (or of an affiliate of such Lender)
as such Lender may from time





                                Credit Agreement
<PAGE>   7
                                    - 3 -

to time specify to the Administrative Agent and the Company as the office by
which its Loans of such Type are to be made and maintained.

                           "Applicable Margin" shall mean 0.25% per annum.

                           "Assignment and Acceptance" shall mean an Assignment
and Acceptance substantially in the form of Exhibit F hereto, duly completed
and executed.

                           "Barclays" shall mean Barclays Bank PLC.

                           "Base Rate" shall mean, for any day, a rate per
annum equal to the higher of (a) the Federal Funds Rate for such day plus 1/2
of 1% and (b) the Prime Rate for such day.  Each change in any interest rate
provided for herein based upon the Base Rate resulting from a change in the
Base Rate shall take effect at the time of such change in the Base Rate.

                           "Base Rate Continuation Date" shall mean, with
respect to any Base Rate Loan, the date (if any) which is 30 days after the
date such Base Rate Loan is made or Converted from a Eurodollar Loan or (in the
event of an existing Base Rate Loan) the last day of the preceding 30-day
period.

                           "Base Rate Loans" shall mean Loans that bear
interest at rates based upon the Base Rate.

                           "Basle Accord" shall mean the proposals for
risk-based capital framework described by the Basle Committee on Banking
Regulations and Supervisory Practices in its paper entitled "International
Convergence of Capital Measurement and Capital Standards" dated July 1988, as
amended, modified and supplemented and in effect from time to time or any
replacement thereof.

                           "Business Day" shall mean any day (a) on which
commercial banks are not authorized or required to close in New York City and
(b) if such day relates to a borrowing of, a payment or prepayment of principal
of or interest on, a Conversion of or into, or an Interest Period for, a
Eurodollar Loan or a notice by the Company with respect to any such borrowing,
payment, prepayment, Conversion or Interest Period, that is also a day on which
dealings in Dollar deposits are carried out in the London interbank market.

                           "BZW" shall mean BZW, a division of Barclays Bank
PLC.





                                Credit Agreement
<PAGE>   8
                                    - 4 -



                           "Capital Lease Obligations" shall mean, for any
Person, all obligations of such Person to pay rent or other amounts under a
lease of (or other agreement conveying the right to use) Property to the extent
such obligations are required to be classified and accounted for as a capital
lease on a balance sheet of such Person under GAAP, and, for purposes of this
Agreement, the amount of such obligations shall be the capitalized amount
thereof, determined in accordance with GAAP.

                           "Chase" shall mean The Chase Manhattan Bank.

                           "Closing Date" shall mean the date upon which the
conditions precedent to effectiveness specified in Section 6.01 hereof are
satisfied or waived.

                           "Commitment" shall mean, as to each Lender, the
obligation of such Lender to make Loans in an aggregate principal amount at any
one time outstanding up to but not exceeding the amount set opposite the name
of such Lender on Schedule I hereto or, in the case of a Person that becomes a
Lender pursuant to an assignment permitted under Section 11.06(b) hereof, as
specified in the respective Assignment and Acceptance or other instrument of
assignment pursuant to which such assignment is effected (as the same may be
reduced at any time or from time to time pursuant to Section 2.03 hereof).

                           "Commitment Termination Date" shall mean the earlier
of (a) August 21, 1998 (or, if such date does not fall on a day that is a
Business day, the next succeeding Business Day) and (b) the date on which any
Permanent Financing shall become effective and the initial borrowing thereunder
shall occur.

                           "Company Default" shall mean any Event of Default
under clauses (a) through (e), (g) and (h) of Section 9 hereof (but, in the
case of clauses (g) and (h), only with respect to the Company or any Subsidiary
of the Company which is subject to said clause (g) or (h)) or any event which
with notice or lapse of time or both would become such an Event of Default.

                           "Continue", "Continuation" and "Continued" shall
refer to the continuation pursuant to Section 2.08 hereof of a Eurodollar Loan
from one Interest Period to the next Interest Period.

                           "Convert", "Conversion" and "Converted" shall refer
to a conversion pursuant to Section 2.08 hereof of one Type of Loan into
another Type of Loan, which may be accompanied by the





                                Credit Agreement
<PAGE>   9
                                    - 5 -

transfer by a Lender (at its sole discretion) of a Loan from one Applicable
Lending Office to another.

                           "Credit Documents" shall mean, collectively, this
Agreement, the Revolving Credit Notes and the Motorola Guarantee Agreement.

                           "Credit Party" shall mean the Company or Motorola.

                           "Default" shall mean an Event of Default or an event
that with notice or lapse of time or both would become an Event of Default.

                           "Dollars" and "$" shall mean lawful money of the
United States of America.

                           "Environmental Laws" shall mean any and all present
and future U.S. Federal, state, local and foreign laws, rules or regulations,
and any orders or decrees, in each case as now or hereafter in effect, relating
to the regulation or protection of the environment or to emissions, discharges,
releases or threatened releases of pollutants, contaminants, chemicals or toxic
or hazardous substances or wastes into the indoor or outdoor environment,
including, without limitation, ambient air, soil, surface water, ground water,
wetlands, land or subsurface strata, or otherwise relating to the manufacture,
processing, distribution, use, treatment, storage, disposal, transport or
handling of pollutants, contaminants, chemicals or toxic or hazardous
substances or wastes.

                           "Equity Rights" shall mean, with respect to any
Person, any subscriptions, options, warrants, commitments, preemptive rights or
agreements of any kind (including, without limitation, any stockholders' or
voting trust agreements) for the issuance, sale, registration or voting of, or
securities convertible into, any additional shares of equity interests of any
type or class of such Person.

                           "ERISA" shall mean the Employee Retirement Income
Security Act of 1974, as amended from time to time.

                           "ERISA Affiliate" of any Person shall mean any
corporation or trade or business that is a member of any group of organizations
(i) described in Section 414(b) or (c) of the U.S. Tax Code of which such
Person is a member and (ii) solely for purposes of potential liability under
Section 302(c)(11) of ERISA and Section 412(c)(11) of the U.S. Tax Code and the
lien created under Section 302(f) of ERISA and Section 412(n) of the U.S. Tax





                                Credit Agreement
<PAGE>   10
                                    - 6 -

Code, described in Section 414(m) or (o) of the U.S. Tax Code of which such
Person is a member.

                           "Eurodollar Base Rate" shall mean, with respect to
any Eurodollar Loan for any Interest Period therefor, the arithmetic mean
(rounded upwards, if necessary, to the nearest 1/16 of 1%), as determined by
the Administrative Agent, of the rates per annum quoted by the respective
Reference Banks at approximately 11:00 a.m. London time (or as soon thereafter
as practicable) on the date two Business Days prior to the first day of such
Interest Period for the offering by the respective Reference Banks to leading
banks in the London interbank market of Dollar deposits having a term
comparable to such Interest Period and in an amount comparable to the principal
amount of the Eurodollar Loan to be made by the respective Reference Banks for
such Interest Period, provided that, if any Reference Bank shall cease to make
such offers, the Eurodollar Base Rate shall be based, for such Reference Bank
for any Interest Period, on the rate per annum (rounded upwards, if necessary,
to the nearest 1/16 of 1%) reported on the date two Business Days prior to the
first day of such Interest Period on Telerate Access Service Page 3750 (British
Bankers Association Settlement Rate) as the London Interbank Offered Rate for
Dollar deposits having a term comparable to such Interest Period and in an
amount of $1,000,000 or more (or, if said Page shall cease to be publicly
available or if the information contained on said Page, in the reasonable
judgment of such Reference Bank, shall cease to accurately reflect such London
Interbank Offered Rate, the Eurodollar Base Rate shall be based on the rate
reported by any publicly available source of similar market data selected by
such Reference Bank that, in the reasonable judgment of such Reference Bank,
accurately reflects such London Interbank Offered Rate).  If any Reference Bank
is not participating in any Eurodollar Loans during any Interest Period
therefor, the Eurodollar Base Rate for such Loans for such Interest Period
shall, except as otherwise provided in the immediately preceding sentence, be
determined by reference to the amount of such Loans that such Reference Bank
would have made or had outstanding had it been participating in such Loan
during such Interest Period.

                           "Eurodollar Loans" shall mean Loans that bear
interest at rates based on rates referred to in the definition of "Eurodollar
Base Rate" in this Section 1.01.

                           "Eurodollar Rate" shall mean, for any Eurodollar
Loan for any Interest Period therefor, a rate per annum (rounded upwards, if
necessary, to the nearest 1/100 of 1%) determined by the Administrative Agent
to be equal to the Eurodollar Base Rate





                                Credit Agreement
<PAGE>   11
                                    - 7 -

for such Loan for such Interest Period divided by 1 minus the Reserve
Requirement (if any) for such Loan for such Interest Period.

                           "Events of Default" shall have the meaning assigned
to such term in Section 9 hereof.

                           "Federal Funds Rate" shall mean, for any day, the
rate per annum (rounded upwards, if necessary, to the nearest 1/100 of 1%)
equal to the weighted average of the rates on overnight Federal funds
transactions with members of the Federal Reserve System arranged by Federal
funds brokers on such day, as published by the Federal Reserve Bank of New York
on the Business Day next succeeding such day, provided that (a) if the day for
which such rate is to be determined is not a Business Day, the Federal Funds
Rate for such day shall be such rate on such transactions on the next preceding
Business Day as so published on the next succeeding Business Day and (b) if
such rate is not so published for any Business Day, the Federal Funds Rate for
such Business Day shall be the average rate charged to Chase on such Business
Day on such transactions as determined by the Administrative Agent.

                           "GAAP" shall mean generally accepted accounting
principles applied on a basis consistent with those that, in accordance with
the last sentence of Section 1.02(a) hereof, are to be used in making the
calculations for purposes of determining compliance with this Agreement.

                           "Governmental Approval" shall mean any permit,
license, variance, certification, no-action letter, clearance, exemption or
other approval issued or granted by any Governmental Authority.

                           "Governmental Authority" shall mean any nation or
government, any state, province, territory or other political subdivision
thereof, any central bank or other equivalent entity and any other agency,
body, department, bureau, authority, instrumentality or other entity exercising
executive, legislative, judicial, regulatory, monetary, taxing or
administrative functions of or pertaining to government.

                           "Guarantee" shall mean a guarantee, an endorsement,
a contingent agreement to purchase or to furnish funds for the payment or
maintenance of, or otherwise to be or become contingently liable under or with
respect to, the Indebtedness, other obligations, net worth, working capital or
earnings of any Person, or a guarantee of the payment of dividends or other





                                Credit Agreement
<PAGE>   12
                                    - 8 -


distributions upon the stock or equity interests of any Person, or an agreement
to purchase, sell or lease (as lessee or lessor) Property, products, materials,
supplies or services primarily for the purpose of enabling a debtor to make
payment of such debtor's obligations or an agreement to assure a creditor
against loss, and including, without limitation, causing a bank or other
financial institution to issue a letter of credit or other similar instrument
for the benefit of another Person, but excluding endorsements for collection or
deposit in the ordinary course of business.  The terms "Guarantee" and
"Guaranteed" used as a verb shall have a correlative meaning.

                           "Indebtedness" shall mean, for any Person (without
duplication): (a) obligations created, issued or incurred by such Person for
borrowed money (whether by loan, the issuance and sale of debt securities or
the sale of Property to another Person subject to an understanding or
agreement, contingent or otherwise, to repurchase such Property from such
Person); (b) obligations of such Person to pay the deferred purchase or
acquisition price of Property or services, other than trade accounts payable
(other than for borrowed money) arising, and accrued expenses incurred, in the
ordinary course of business so long as such trade accounts payable are payable
within 180 days of the date the respective goods are delivered or the
respective services are rendered; (c) Indebtedness of others secured by a Lien
on the Property of such Person, whether or not the respective Indebtedness so
secured has been assumed by such Person; (d) obligations of such Person in
respect of letters of credit or similar instruments issued or accepted by banks
and other financial institutions for account of such Person; (e) Capital Lease
Obligations of such Person; (f) all obligations of such Person to purchase,
redeem, retire, defease or otherwise make any payment in respect of any
Redeemable Equity Interests of such Person (which obligations shall be valued
at the greater of the voluntary and involuntary liquidation preference thereof
plus accrued and unpaid dividends which are required to be paid upon such
purchase, redemption, retirement or defeasance); and (g) Indebtedness of others
Guaranteed by such Person.

                           "Information Memorandum" shall mean the Confidential
Information Memorandum dated June, 1996 with respect to the credit facilities
provided under this Agreement.

                           "Interest Period" shall mean, with respect to any
Eurodollar Loan, each period commencing on the date such Eurodollar Loan is
made or Converted from a Base Rate Loan or (in the event of a Continuation) the
last day of the next preceding Interest Period for such Loan and ending on the
numerically





                                Credit Agreement
<PAGE>   13
                                    - 9 -



corresponding day in the first, second, third or sixth calendar month
thereafter, as the Company may select as provided in Section 4.05 hereof,
except that each Interest Period that commences on the last Business Day of a
calendar month (or on any day for which there is no numerically corresponding
day in the appropriate subsequent calendar month) shall end on the last
Business Day of the appropriate subsequent calendar month.  Notwithstanding the
foregoing:  (i) if any Interest Period would otherwise end after the Commitment
Termination Date, such Interest Period shall end on the Commitment Termination
Date; (ii) each Interest Period that would otherwise end on a day that is not a
Business Day shall end on the next succeeding Business Day (or, if such next
succeeding Business Day falls in the next succeeding calendar month, on the
next preceding Business Day); and (iii) notwithstanding clause (i) above, no
Interest Period shall have a duration of less than one month and, if the
Interest Period for any Eurodollar Loan would otherwise be a shorter period,
such Interest Period shall not be available hereunder.

                           "Interest Rate Protection Agreement" shall mean, for
any Person, an interest rate swap, cap or collar agreement or similar
arrangement between such Person and one or more financial institutions
providing for the transfer or mitigation of interest rate risks either
generally or under specific contingencies.

                           "Investment" shall mean, for any Person:  (a) the
acquisition (whether for cash, Property, services or securities or otherwise)
of bonds, notes, debentures, equity interests of any type or class or other
securities of any other Person or any agreement to make any such acquisition
(including, without limitation, any "short sale" or any sale of any securities
at a time when such securities are not owned by the Person entering into such
sale); (b) the making of any deposit with, or advance, loan or other extension
of credit to, any other Person (including the purchase of Property from another
Person subject to an understanding or agreement, contingent or otherwise, to
resell such Property to such Person), but excluding any such deposit, advance,
loan or extension of credit having a term not exceeding 180 days arising in
connection with the sale of inventory, services or supplies by such Person in
the ordinary course of business; (c) the entering into of any Guarantee of, or
other contingent obligation with respect to, Indebtedness or other liability of
any other Person and (without duplication) any amount committed to be advanced,
lent or extended to such Person; or (d) the entering into of any Interest Rate
Protection Agreement.





                                Credit Agreement
<PAGE>   14
                                      - 10 -

                           "Lien" shall mean, with respect to any Property, any
mortgage, lien, pledge, charge, security interest or encumbrance of any kind in
respect of such Property.  For purposes of this Agreement, a Person shall be
deemed to own subject to a Lien any Property that it has acquired or holds
subject to the interest of a vendor or lessor under any conditional sale
agreement, capital lease or other title retention agreement (other than an
operating lease) relating to such Property.

                           "LLC Agreement" shall mean the Limited Liability
Company Agreement entered into by the members of the Company, dated as of July
29, 1996, pursuant to which the Company is organized, as the same shall be
amended and otherwise modified and in effect from time to time.

                           "Loans" shall mean the loans provided for in Section
2.01 hereof, which may be Base Rate Loans and/or Eurodollar Loans.

                           "Majority Lenders" shall mean Lenders having more
than 50% of the aggregate amount of the Commitments or, if the Commitments
shall have terminated, Lenders holding more than 50% of the aggregate unpaid
principal amount of the Loans.

                           "Margin Stock" shall mean "margin stock" within the
meaning of Regulations G, T, U and X.

                           "Material Adverse Effect" shall mean a material
adverse effect on (a) the financial condition of the Company and its
Subsidiaries taken as a whole or (b) the validity or enforceability against the
Company or Motorola of any of the Credit Documents if, in the case of any of
the foregoing, it could reasonably be likely to have an adverse effect on the
likelihood of the payment of the principal of or interest on the Loans or other
amounts payable in connection therewith, taking into account the Motorola
Guarantee Agreement.

                           "Motorola" shall mean Motorola, Inc., a Delaware
corporation.

                           "Motorola Default" shall mean any Event of Default
under clauses (f) through (n) of Section 9 hereof (but, in the case of clauses
(g) and (h), only with respect to Motorola or any of the Motorola Domestic
Subsidiaries) or any event which with notice or lapse of time or both would
become such an Event of Default.





                                Credit Agreement
<PAGE>   15
                                    - 11 -

                           "Motorola Domestic Subsidiaries" shall have the
meaning assigned to such term in the Motorola Guarantee Agreement.

                           "Motorola Guarantee Agreement" shall mean the
Guarantee Agreement substantially in the form of Exhibit B hereto between
Motorola and the Administrative Agent, as the same shall be modified and
supplemented and in effect from time to time.

                           "Motorola's Net Worth" shall have the meaning
assigned to such term in Section 9(k) hereof.

                           "Multiemployer Plan" of any Person shall mean a
multiemployer plan defined as such in Section 3(37) of ERISA to which
contributions have been made by such Person or any ERISA Affiliate of such
Person and that is covered by Title IV of ERISA.

                           "PBGC" shall mean the Pension Benefit Guaranty
Corporation or any entity succeeding to any or all of its functions under
ERISA.

                           "Permanent Financing" shall mean a credit facility
for the Company arranged by the Global Arrangers in an aggregate principal
amount of not less than $2,000,000,000 for the purpose of financing the Project
(including, without limitation, refinancing Indebtedness of the Company
hereunder).

                           "Permitted Investments" shall mean:  (a) direct
obligations of the United States of America, or of any agency thereof, or
obligations guaranteed as to principal and interest by the United States of
America, or of any agency thereof, in either case maturing not more than 180
days from the date of acquisition thereof; (b) certificates of deposit issued
by, bankers' acceptances created by, or time deposits with, any bank or trust
company organized under the laws of the United States of America or any state
thereof, or any other country that is a member of the Organization for Economic
Cooperation and Development, and (in each case) having capital, surplus and
undivided profits of at least $500,000,000, maturing not more than 180 days
from the date of acquisition thereof; (c) commercial paper rated (on the date
of acquisition thereof by the Company) A-1 or better or P-1 by Standard &
Poor's Ratings Services or Moody's Investors Service, Inc., respectively,
maturing not more than 180 days from the date of acquisition thereof; (d)
Interest Rate Protection Agreements entered into by the Company with one or
more counterparties to protect itself from fluctuations in floating interest
rates with respect to Indebtedness hereunder and other Indebtedness permitted
pursuant





                                Credit Agreement
<PAGE>   16
                                    - 12 -

to Section 8.07 hereof; (e) repurchase agreements with any financial
institution having capital, surplus and undivided profits of at least
$100,000,000, which repurchase agreements are fully collateralized by
obligations of the type described in clause (a) above; and (f) any mutual or
similar fund investing exclusively in Permitted Investments of the type
described in clauses (a), (b) and (c) above.

                           "Person" shall mean any individual, corporation,
company, voluntary association, partnership, limited liability company, joint
venture, trust, unincorporated organization or Governmental Authority.

                           "Plan" of any Person shall mean an employee benefit
or other plan established or maintained by such Person or any ERISA Affiliate
of such Person and that is covered by Title IV of ERISA, other than a
Multiemployer Plan.

                           "Post-Default Rate" shall mean a rate per annum
equal to 2% plus the Base Rate as in effect from time to time, provided that,
with respect to principal of a Eurodollar Loan that shall become due (whether
at stated maturity, by acceleration, by prepayment or otherwise) on a day other
than the last day of the Interest Period therefor, the "Post-Default Rate"
shall be, for the period from and including such due date to but excluding the
last day of such Interest Period, 2% plus the interest rate for such Loan as
provided in Section 3.02(b) hereof and, thereafter, the rate provided for above
in this definition.

                           "Prime Rate" shall mean the rate of interest from
time to time announced by Chase at its principal office in New York, New York
as its prime commercial lending rate.

                           "Project" shall mean the IRIDIUM(R) global wireless
communications system and all systems, Property and businesses and activities
related thereto.

                           "Property" shall mean any right or interest in or to
property of any kind whatsoever, whether real, personal or mixed and whether
tangible or intangible.

                           "Quarterly Dates" shall mean the last Business Day
of March, June, September and December in each year, the first of which shall
be the first such day after the date hereof.

                           "Redeemable Equity Interest" shall mean any
preferred stock or other equity interest of any Person that (a) such Person has
committed to redeem at a fixed or determinable date or dates





                                Credit Agreement
<PAGE>   17
                                    - 13 -

prior to the Commitment Termination Date, whether by operation of a sinking
fund or otherwise, or upon the occurrence of a condition not solely within the
control of such issuer or (b) is redeemable on any date prior to the Commitment
Termination Date at the option of the holder thereof.

                           "Reference Banks" shall mean Chase, Barclays and
such other Lender or Lenders (if any) designated as such by the Global
Arrangers from time to time (or their respective Applicable Lending Offices, as
the case may be).

                           "Regulations A, D, G, T, U and X" shall mean,
respectively, Regulations A, D, G, T, U and X of the Board of Governors of the
Federal Reserve System (or any successor), as the same may be modified and
supplemented and in effect from time to time.

                           "Regulatory Change" shall mean, with respect to any
Lender, any change after the date hereof in U.S.  Federal, state or foreign law
or regulations (including, without limitation, Regulation D) or the adoption or
making after such date of any interpretation, directive or request applying to
a class of banks including such Lender of or under any U.S. Federal, state or
foreign law or regulations (whether or not having the force of law and whether
or not failure to comply therewith would be unlawful) by any court or
Governmental Authority charged with the interpretation or administration
thereof.

                           "Reserve Requirement" shall mean, for any Interest
Period for any Eurodollar Loan, the average maximum rate at which reserves
(including, without limitation, any marginal, supplemental or emergency
reserves) are required to be maintained during such Interest Period under
Regulation D by member banks of the Federal Reserve System in New York City
with deposits exceeding one billion Dollars against "Eurocurrency liabilities"
(as such term is used in Regulation D).  Without limiting the effect of the
foregoing, the Reserve Requirement shall include any other reserves required to
be maintained by such member banks by reason of any Regulatory Change with
respect to (i) any category of liabilities that includes deposits by reference
to which the Eurodollar Base Rate is to be determined as provided in the
definition of "Eurodollar Base Rate" in this Section 1.01 or (ii) any category
of extensions of credit or other assets that includes Eurodollar Loans.

                           "Restricted Payment" shall mean (a) dividends (in
cash, Property or obligations) on, or other payments or distributions on
account of, or the setting apart of money for a sinking or





                                Credit Agreement
<PAGE>   18
                                    - 14 -

other analogous fund for, or the purchase, redemption, retirement or other
acquisition of, any equity interest of the Company or of any warrants, options
or other rights to acquire the same (or any payments to any Person, such as
"phantom stock" payments, where the amount thereof is calculated with reference
to the fair market or equity value of the Company or any of its Subsidiaries),
but excluding any dividend payable solely in equity interests of the Company
(other than Redeemable Equity Interests), and (b) payments in respect of
Indebtedness permitted under Section 8.07(f) hereof.

                           "Revolving Credit Notes" shall mean the promissory
notes provided for by Section 2.07 hereof and all promissory notes delivered in
substitution or exchange therefor, in each case as the same shall be modified
and supplemented and in effect from time to time.

                           "Subsidiary" shall mean, with respect to any Person,
any corporation, partnership, limited liability company or other entity of
which at least a majority of the securities or other equity interests having by
the terms thereof ordinary voting power to elect a majority of the board of
directors or other persons performing similar functions of such corporation,
partnership, limited liability company or other entity (irrespective of whether
or not at the time securities or other equity interests of any other class or
classes of such corporation, partnership, limited liability company or other
entity shall have or might have voting power by reason of the happening of any
contingency) is at the time directly or indirectly owned or controlled by such
Person or one or more Subsidiaries of such Person or by such Person and one or
more Subsidiaries of such Person.

                           "Type" shall have the meaning assigned to such term
in Section 1.03 hereof.

                           "U.S. Bankruptcy Code" shall mean the United States
Federal Bankruptcy Code of 1978, as amended from time to time.

                           "U.S. Tax Code" shall mean the Internal Revenue Code
of 1986, as amended from time to time.

                           "Wholly Owned Subsidiary" shall mean, with respect
to any Person, any corporation, partnership, limited liability company or other
entity of which all of the equity interests (other than, in the case of a
corporation, directors' qualifying shares) are directly or indirectly owned or
controlled by such Person or one or more Wholly Owned Subsidiaries of such
Person or





                                Credit Agreement
<PAGE>   19
                                    - 15 -

by such Person and one or more Wholly Owned Subsidiaries of such Person.

                           1.02  Accounting Terms and Determinations.

                           (a)  Except as otherwise expressly provided herein,
all accounting terms used herein shall be interpreted, and all financial
statements and certificates and reports as to financial matters required to be
delivered to the Administrative Agent or the Lenders hereunder shall (unless
otherwise disclosed to the Administrative Agent or the Lenders in writing at
the time of delivery thereof in the manner described in paragraph (b) below) be
prepared, in accordance with generally accepted accounting principles applied
on a basis consistent with those used in the preparation of the latest
financial statements furnished to the Administrative Agent or the Lenders
hereunder (which, prior to the delivery of the first financial statements under
Section 8.01 hereof, shall mean the audited financial statements as at December
31, 1995 referred to in Section 7.02 hereof).  All calculations made for the
purposes of determining compliance with this Agreement shall (except as
otherwise expressly provided herein) be made by application of generally
accepted accounting principles applied on a basis consistent with those used in
the preparation of the latest annual or quarterly financial statements
furnished to the Administrative Agent or the Lenders pursuant to Section 8.01
hereof (or, prior to the delivery of the first financial statements under
Section 8.01 hereof, used in the preparation of the audited financial
statements as at December 31, 1995 referred to in Section 7.02 hereof) unless
(i) the Company shall have objected to determining such compliance on such
basis at the time of delivery of such financial statements or (ii) the Majority
Lenders shall so object in writing within 30 days after delivery of such
financial statements, in either of which events such calculations shall be made
on a basis consistent with those used in the preparation of the latest
financial statements as to which such objection shall not have been made
(which, if objection is made in respect of the first financial statements
delivered under Section 8.01 hereof, shall mean the audited financial
statements as at December 31, 1995 referred to in Section 7.02 hereof).

                           (b)  The Company shall deliver to the Administrative
Agent (for distribution to the Lenders) at the same time as the delivery of any
annual or quarterly financial statement under Section 8.01 hereof (i) a
description in reasonable detail of any material variation between the
application of accounting principles employed in the preparation of such
statement and the application of accounting principles employed in the
preparation





                                Credit Agreement
<PAGE>   20
                                    - 16 -

of the next preceding annual or quarterly financial statements as to which no 
objection has been made in accordance with the last sentence of subsection (a) 
above and (ii) reasonable estimates of the difference between such statements 
arising as a consequence thereof.

                           (c)  The Company will not change the last day of its
fiscal year from December 31 of each year, or the last days of the first three
fiscal quarters in each of its fiscal years from March 31, June 30 and
September 30 of each year, respectively.

                           1.03  Types of Loans.  Loans hereunder are
distinguished by "Type".  The "Type" of a Loan refers to whether such Loan is a
Base Rate Loan or a Eurodollar Loan, each of which constitutes a Type.


                           Section 2.  Commitments, Loans, Revolving Credit
Notes and Prepayments.

                           2.01  Loans.  Each Lender severally agrees, on the
terms and conditions of this Agreement, to make loans to the Company in Dollars
during the period from and including the Closing Date to but not including the
Commitment Termination Date in an aggregate principal amount at any one time
outstanding up to but not exceeding the amount of the Commitment of such Lender
as in effect from time to time.  Subject to the terms and conditions of this
Agreement, during such period the Company may borrow, repay and reborrow the
amount of the Commitments by means of Base Rate Loans and Eurodollar Loans and
may Convert Loans of one Type into Loans of another Type (as provided in
Section 2.08 hereof) or Continue Loans of one Type as Loans of the same Type
(as provided in Section 2.08 hereof); provided that no more than six separate
Interest Periods in respect of Eurodollar Loans from each Lender may be
outstanding at any one time.

                           2.02  Borrowings.  The Company shall give the
Administrative Agent notice of each borrowing hereunder as provided in Section
4.05 hereof.  Not later than 1:00 p.m. New York time on the date specified for
each borrowing hereunder, each Lender shall make available the amount of the
Loan or Loans to be made by it on such date to the Administrative Agent, at an
account in New York, New York specified by the Administrative Agent, in
immediately available funds, for account of the Company.  The amount so
received by the Administrative Agent shall, subject to the terms and conditions
of this Agreement, be made available to the Company by depositing the same, in
immediately available funds, in an account of the Company





                                Credit Agreement
<PAGE>   21
                                    - 17 -

designated by the Company and maintained with Chase in New York, New York.

                           2.03  Changes of Commitments.

                           (a)  The aggregate amount of the Commitments shall
be automatically reduced to zero on the Commitment Termination Date.

                           (b)  The Company shall have the right at any time or
from time to time (i) so long as no Loans are outstanding, to terminate the
Commitments and (ii) to reduce the aggregate unused amount of the Commitments;
provided that (x) the Company shall give notice of each such termination or
reduction as provided in Section 4.05 hereof and (y) each partial reduction
shall be in an aggregate amount at least equal to $25,000,000 (or a larger
multiple of $1,000,000).

                           (c)  The Commitments once terminated or reduced may
not be reinstated.

                           2.04  Commitment Fee.  The Company shall pay to the
Administrative Agent for account of each Lender a commitment fee on the daily
average unused amount of such Lender's Commitment, for the period from and
including the Closing Date to but not including the earlier of the date such
Commitment is terminated and the Commitment Termination Date, at a rate per
annum equal to 0.10%.  Accrued commitment fee shall be payable on each
Quarterly Date and on the earlier of the date the Commitments are terminated
and the Commitment Termination Date.

                           2.05  Lending Offices.  The Loans of each Type made
by each Lender shall be made and maintained at such Lender's Applicable Lending
Office for Loans of such Type.

                           2.06  Several Obligations; Remedies Independent.
The failure of any Lender to make any Loan to be made by it on the date
specified therefor shall not relieve any other Lender of its obligation to make
its Loan on such date, but neither any Lender nor any Agent shall be
responsible for the failure of any other Lender to make a Loan to be made by
such other Lender, and (except as otherwise provided in Section 4.06 hereof) no
Lender shall have any obligation to either Agent or any other Lender for the
failure by such Lender to make any Loan required to be made by such Lender.
The amounts payable by the Company at any time hereunder and under the
Revolving Credit Notes to each Lender shall be a separate and independent debt
and each Lender shall be entitled to protect and enforce its rights arising out
of this Agreement and the Revolving Credit Notes, and it shall not be





                                Credit Agreement
<PAGE>   22
                                    - 18 -

necessary for any other Lender or any Agent to consent to, or be joined as an
additional party in, any proceedings for such purposes.

                           2.07  Revolving Credit Notes.

                           (a)  The Loans made by each Lender shall be
evidenced by a single promissory note of the Company substantially in the form
of Exhibit A hereto, dated the date hereof, payable to such Lender in a
principal amount equal to the amount of its Commitment as originally in effect
and otherwise duly completed.

                           (b)  The date, amount, Type, interest rate and
duration of Interest Period (if applicable) of each Loan made by each Lender to
the Company, and each payment made on account of the principal thereof, shall
be recorded by such Lender on its books and, prior to any transfer of the
Revolving Credit Note held by it, endorsed by such Lender on the schedule
attached to such Revolving Credit Note or any continuation thereof; provided
that the failure of such Lender to make any such recordation or endorsement
shall not affect the obligations of the Company to make a payment when due of
any amount owing hereunder or under such Revolving Credit Note in respect of
the Loans.

                           (c)  No Lender shall be entitled to have its
Revolving Credit Note substituted or exchanged for any reason, or subdivided
for promissory notes of lesser denominations, except in connection with a
permitted assignment of all or any portion of such Lender's Commitment, Loans
and Revolving Credit Note pursuant to Section 11.06 hereof (and, if requested
by any Lender, the Company agrees to so exchange any Revolving Credit Note).

                           2.08  Prepayments and Conversions or Continuations
of Loans.

                           (a)  Subject to Section 4.04 hereof, the Company
shall have the right to prepay Loans, or to Convert Loans of one Type into
Loans of another Type or Continue Loans of one Type as Loans of the same Type,
at any time or from time to time, provided that:  (i) the Company shall give
the Administrative Agent notice of each such prepayment, Conversion or
Continuation as provided in Section 4.05 hereof (and, upon the date specified
in any such notice of prepayment, the amount to be prepaid shall become due and
payable hereunder), which notice shall, in the case of each Conversion or
Continuation, be accompanied by the certificate specified in said Section 4.05;
and (ii) any prepayment of or Conversion of any Eurodollar Loan on a day other
than the last





                                Credit Agreement
<PAGE>   23
                                    - 19 -

day of an Interest Period for such Loan shall be subject to Section 5.05
hereof.  Notwithstanding the foregoing, and without limiting the rights and
remedies of the Lenders under Section 9 hereof, in the event that any Event of
Default shall have occurred and be continuing, the Administrative Agent may
(and at the request of the Majority Lenders shall) suspend the right of the
Company to Convert any Loan into a Eurodollar Loan, or to Continue any Loan as
a Eurodollar Loan, in which event all Loans shall be Converted (on the last
day(s) of the respective Interest Periods therefor) or Continued, as the case
may be, as Base Rate Loans.

                           (b)  In the event that (i) on the date of any
borrowing, Conversion or Continuation (after giving effect thereto) or on any
Base Rate Continuation Date the Aggregate Projected Loan Amount determined as
of such date shall exceed $745,000,000 and (ii) such Aggregate Projected Loan
Amount shall not be reduced to or below $745,000,000 within three Business Days
after such date, the Company shall immediately prepay in full all of the Loans,
together with accrued interest thereon and all other amounts payable by the
Company hereunder and under the Revolving Credit Notes and the Commitments
shall automatically be terminated.

                           Section 3.  Payments of Principal and Interest.

                           3.01  Repayment of Loans.  The Company hereby
promises to pay to the Administrative Agent for account of each Lender the
entire outstanding principal amount of such Lender's Loans, and each Loan shall
mature, on the Commitment Termination Date.

                           3.02  Interest.  The Company hereby promises to pay
to the Administrative Agent for account of each Lender interest on the unpaid
principal amount of each Loan made by such Lender for the period from and
including the date of such Loan to but excluding the date such Loan shall be
paid in full, at the following rates per annum:

                           (a)  during such periods as such Loan is a Base Rate
         Loan, the Base Rate (as in effect from time to time) and

                           (b)  during such periods as such Loan is a
         Eurodollar Loan, for each Interest Period relating thereto, the
         Eurodollar Rate for such Loan for such Interest Period plus the
         Applicable Margin.

Notwithstanding the foregoing, the Company hereby promises to pay to the
Administrative Agent for account of each Lender interest





                                Credit Agreement
<PAGE>   24
                                    - 20 -

at the applicable Post-Default Rate on any principal of any Loan made by such
Lender and on any other amount payable by the Company hereunder or under the
Revolving Credit Note held by such Lender to or for account of such Lender,
that shall not be paid in full when due (whether at stated maturity, by
acceleration or otherwise), for the period from and including the due date
thereof to but excluding the date the same is paid in full.  Accrued interest
on each Loan shall be payable (i) in the case of a Base Rate Loan, quarterly on
the Quarterly Dates, (ii) in the case of a Eurodollar Loan, on the last day of
each Interest Period therefor and, if such Interest Period is longer than three
months, at three-month intervals following the first day of such Interest
Period, and (iii) in the case of any Loan, upon the payment or prepayment
thereof or the Conversion of such Loan to a Loan of another Type (but only on
the principal amount so paid, prepaid or Converted), except that interest
payable at the Post-Default Rate on any past due amount shall be payable from
time to time on demand.  Promptly after the determination of any interest rate
provided for herein or any change therein, the Administrative Agent shall give
notice thereof to the Lenders to which such interest is payable and to the
Company.


                           Section 4.  Payments; Pro Rata Treatment;
Computations; Etc.

                           4.01  Payments.

                           (a)  Except to the extent otherwise provided herein,
all payments of principal, interest and other amounts to be made by the Company
under this Agreement and the Revolving Credit Notes shall be made to the
Administrative Agent at an account in New York, New York specified by the
Administrative Agent in Dollars, in immediately available funds, without
deduction, set-off or counterclaim, not later than 1:00 p.m. New York time on
the date on which such payment shall become due (each such payment made after
such time on such due date to be deemed to have been made on the next
succeeding Business Day).

                           (b)  Any Lender for whose account any such payment
is to be made may (but shall not be obligated to) debit the amount of any such
payment that is not made by such time to any ordinary deposit account of the
Company with such Lender (with notice to the Company and the Administrative
Agent).

                           (c)  The Company shall, at the time of making each
payment under this Agreement or any Revolving Credit Note for account of any
Lender, specify to the Administrative Agent (which





                                Credit Agreement
<PAGE>   25
                                    - 21 -

shall so notify the intended recipient(s) thereof) the Loans or other amounts
payable by the Company hereunder to which such payment is to be applied (and in
the event that the Company fails to so specify, or if an Event of Default has
occurred and is continuing, the Administrative Agent may distribute such
payment to the Lenders for application in such manner as it or the Majority
Lenders, subject to Section 4.02 hereof, may determine to be appropriate).

                           (d)  Each payment received by the Administrative
Agent under this Agreement or any Revolving Credit Note for account of any
Lender shall be paid by the Administrative Agent promptly to such Lender, in
immediately available funds, for account of such Lender's Applicable Lending
Office for the Loan or other obligation in respect of which such payment is
made.

                           (e)  If the due date of any payment under this
Agreement or any Revolving Credit Note would otherwise fall on a day that is
not a Business Day, such date shall be extended to the next succeeding Business
Day, and interest shall be payable for any principal so extended for the period
of such extension.

                           4.02  Pro Rata Treatment.  Except to the extent
otherwise provided herein:  (a) each borrowing from the Lenders under Section
2.01 hereof shall be made from the Lenders, each payment of commitment fee
under Section 2.04 hereof shall be made for account of the Lenders, and each
termination or reduction of the amount of the Commitments under Section 2.03
hereof shall be applied to the respective Commitments of the Lenders, pro rata
according to the amounts of their respective Commitments; (b) except as
otherwise provided in Section 5.04 hereof, Eurodollar Loans having the same
Interest Period shall be allocated pro rata among the Lenders according to the
amounts of their respective Commitments (in the case of the making of Loans) or
their respective Loans (in the case of Conversions and Continuations of Loans);
(c) each payment or prepayment of principal of Loans by the Company shall be
made for account of the Lenders pro rata in accordance with the respective
unpaid principal amounts of the Loans held by them; and (d) each payment of
interest on Loans by the Company shall be made for account of the Lenders pro
rata in accordance with the amounts of interest on such Loans then due and
payable to the respective Lenders.

                           4.03  Computations.  Interest on Eurodollar Loans
and commitment fee shall be computed on the basis of a year of 360 days and
actual days elapsed (including the first day but excluding the last day)
occurring in the period for which payable and interest on Base Rate Loans shall
be computed on the basis of





                                Credit Agreement
<PAGE>   26
                                    - 22 -

a year of 365 or 366 days, as the case may be, and actual days elapsed
(including the first day but excluding the last day) occurring in the period
for which payable.  Notwithstanding the foregoing, for each day that the Base
Rate is calculated by reference to the Federal Funds Rate, interest on Base
Rate Loans shall be computed on the basis of a year of 360 days and actual days
elapsed.

                           4.04  Minimum Amounts.  Except for Conversions or
prepayments made pursuant to Section 5.04 hereof, each borrowing, Conversion,
Continuation and partial prepayment of principal of Loans shall be in an
aggregate amount at least equal to $10,000,000 or a larger multiple of
$1,000,000 (borrowings, Conversions, Continuations or prepayments of or into
Loans of different Types or, in the case of Eurodollar Loans, having different
Interest Periods at the same time hereunder to be deemed separate borrowings,
Conversions, Conversions and prepayments for purposes of the foregoing, one for
each Type or Interest Period), provided that the aggregate principal amount of
Eurodollar Loans having the same Interest Period shall be in an amount at least
equal to $20,000,000 or a larger multiple of $5,000,000 and, if any Eurodollar
Loans would otherwise be in a lesser principal amount for any period, such
Loans shall be Base Rate Loans during such period.

                           4.05  Certain Notices.  Notices by the Company to
the Administrative Agent of terminations or reductions of the Commitments and
of borrowings, Conversions, Continuations and optional prepayments of Loans, of
Types of Loans and of the duration of Interest Periods shall be irrevocable and
shall be effective only if received by the Administrative Agent not later than
10:00 a.m. New York time on the number of Business Days prior to the date of
the relevant termination, reduction, borrowing, Conversion, Continuation or
prepayment or the first day of such Interest Period specified below:

<TABLE>
<CAPTION>
                                                                  Number of
                                                                  Business
              Notice                                             Days Prior
              ------                                             ----------
         <S>                                                      <C>
         Termination or reduction
         of Commitments                                               3

         Borrowing or prepayment of,
         or Conversions into,
         Base Rate Loans                                          same day

         Borrowing or prepayment of,
         Conversions into, Continuations
         as, or duration of Interest
         Period for, Eurodollar Loans                                 3
</TABLE>




                                Credit Agreement

<PAGE>   27
                                    - 23 -

Each such notice of termination or reduction shall specify the amount of the
Commitments to be terminated or reduced.  Each such notice of borrowing,
Conversion, Continuation or optional prepayment shall specify the Loans to be
borrowed, Converted, Continued or prepaid and the amount (subject to Section
4.04 hereof) and Type of each Loan to be borrowed, Converted, Continued or
prepaid and the date of borrowing, Conversion, Continuation or optional
prepayment (which shall be a Business Day), and each such notice of borrowing,
Conversion or Continuation, as the case may be, shall be accompanied by a
certificate of the Company setting forth in reasonable detail the calculation
of the Aggregate Projected Loan Amount as of the date of such borrowing,
Conversion or Continuation, as the case may be.   Each such notice of the
duration of an Interest Period shall specify the Loans to which such Interest
Period is to relate.  The Administrative Agent shall promptly notify the
Lenders of the contents of each notice referred to in this Section 4.05. In the
event that the Company fails to select the Type of Loan, or the duration of any
Interest Period for any Eurodollar Loan, within the time period and otherwise
as provided in this Section 4.05, such Loan (if outstanding as a Eurodollar
Loan) will be automatically Converted into a Base Rate Loan on the last day of
the then current Interest Period for such Loan or (if outstanding as a Base
Rate Loan) will remain as, or (if not then outstanding) will be made as, a Base
Rate Loan.  In addition, not later than 10:00 a.m. New York time on each Base
Rate Continuation Date the Company shall deliver to the Administrative Agent a
certificate of the Company setting forth in reasonable detail the calculation
of the Aggregate Projected Loan Amount as of such date.

           4.06  Non-Receipt of Funds by the Administrative Agent.  Unless the
Administrative Agent shall have been notified by a Lender or the Company (the
"Payor") prior to the date on which the Payor is to make payment to the
Administrative Agent of (in the case of a Lender) the proceeds of a Loan to be
made by such Lender hereunder or (in the case of the Company) a payment to the
Administrative Agent for account of one or more of the Lenders hereunder (such
payment being herein called the "Required Payment"), which notice shall be
effective upon receipt, that the Payor does not intend to make the Required
Payment to the Administrative Agent, the Administrative Agent may assume that
the Required Payment has been made and may, in reliance upon such assumption
(but shall not be required to), make the amount thereof available to the
intended recipient(s) on such date; and, if the Payor has not in fact made the
Required Payment to the Administrative Agent, the recipient(s) of such payment
shall, on demand, repay to the Administrative Agent the amount so made





                                Credit Agreement
<PAGE>   28
                                    - 24 -

available together with interest thereon in respect of each day during the
period commencing on the date (the "Advance Date") such amount was so made
available by the Administrative Agent until the date the Administrative Agent
recovers such amount at a rate per annum equal to the Federal Funds Rate for
such day and, if such recipient(s) shall fail promptly to make such payment,
the Administrative Agent shall be entitled to recover such amount, on demand,
from the Payor, together with interest as aforesaid, provided that if neither
the recipient(s) nor the Payor shall return the Required Payment to the
Administrative Agent within three Business Days of the Advance Date, then,
retroactively to the Advance Date, the Payor and the recipient(s) shall each be
obligated to pay interest on the Required Payment as follows:

                 (i)  if the Required Payment shall represent a payment to be
         made by the Company to the Lenders, the Company and the recipient(s)
         shall each be obligated retroactively to the Advance Date to pay
         interest in respect of the Required Payment at the Post-Default Rate
         (without duplication of the obligation of the Company under Section
         3.02 hereof to pay interest on the Required Payment at the
         Post-Default Rate), it being understood that the return by the
         recipient(s) of the Required Payment to the Administrative Agent shall
         not limit such obligation of the Company under said Section 3.02 to
         pay interest at the Post-Default Rate in respect of the Required
         Payment; and

                 (ii)  if the Required Payment shall represent proceeds of a
         Loan to be made by a Lender to the Company, the Payor and the Company
         shall each be obligated retroactively to the Advance Date to pay
         interest in respect of the Required Payment pursuant to whichever of
         the rates specified in Section 3.02 hereof is applicable to the Type
         of such Loan, it being understood that the return by the Company of
         the Required Payment to the Administrative Agent shall not limit any
         claim the Company may have against the Payor in respect of such
         Required Payment.

                 4.07  Sharing of Payments, Etc.

                 (a)  The Company agrees that, in addition to (and without
limitation of) any right of set-off, banker's lien or counterclaim a Lender may
otherwise have, each Lender shall be entitled, at its option (to the fullest
extent permitted by law), to set off and apply any deposit (general or special,
time or demand, provisional or final), or other indebtedness, held by it for
the credit or account of the Company at any of its offices,





                                Credit Agreement
<PAGE>   29
                                    - 25 -

in Dollars or in any other currency, against any principal of or interest on
any of such Lender's Loans or any other amount payable to such Lender
hereunder, that is not paid when due (regardless of whether such deposit or
other indebtedness is then due to the Company), in which case it shall promptly
notify the Company and the Administrative Agent thereof, provided that such
Lender's failure to give such notice shall not affect the validity thereof.

                 (b)  If any Lender shall obtain from the Company payment of
any principal of or interest on any Loan owing to it or payment of any other
amount under this Agreement or any other Credit Document through the exercise
of any right of set-off, banker's lien or counterclaim or similar right or
otherwise (other than from the Administrative Agent as provided herein), and,
as a result of such payment, such Lender shall have received a greater
percentage of the principal of or interest on the Loans or such other amounts
then due hereunder or thereunder by the Company to such Lender than the
percentage received by any other Lender, it shall promptly purchase from such
other Lenders participations in (or, if and to the extent specified by such
Lender, direct interests in) the Loans or such other amounts, respectively,
owing to such other Lenders (or in interest due thereon, as the case may be) in
such amounts, and make such other adjustments from time to time as shall be
equitable, to the end that all the Lenders shall share the benefit of such
excess payment (net of any expenses that may be incurred by such Lender in
obtaining or preserving such excess payment) pro rata in accordance with the
unpaid principal of and/or interest on the Loans or such other amounts,
respectively, owing to each of the Lenders.  To such end all the Lenders shall
make appropriate adjustments among themselves (by the resale of participations
sold or otherwise) if such payment is rescinded or must otherwise be restored.

                 (c)  The Company agrees that any Lender so purchasing such a
participation (or direct interest) may exercise all rights of set-off, banker's
lien, counterclaim or similar rights with respect to such participation as
fully as if such Lender were a direct holder of Loans or other amounts (as the
case may be) owing to such Lender in the amount of such participation (and the
Company's obligations will be reduced accordingly).

                 (d)  Nothing contained herein shall require any Lender to
exercise any such right or shall affect the right of any Lender to exercise,
and retain the benefits of exercising, any such right with respect to any other
indebtedness or obligation of the Company.  If, under any applicable
bankruptcy, insolvency







                                Credit Agreement
<PAGE>   30
                                    - 26 -

or other similar law, any Lender receives a secured claim in lieu of a set-off
to which this Section 4.07 applies, such Lender shall, to the extent
practicable, exercise its rights in respect of such secured claim in a manner
consistent with the rights of the Lenders entitled under this Section 4.07 to
share in the benefits of any recovery on such secured claim.


                 Section 5.  Yield Protection, Etc.

                 5.01  Additional Costs.

                 (a)  The Company shall pay directly to each Lender from time
to time such amounts as such Lender may determine to be necessary to compensate
such Lender for any costs that such Lender determines are attributable to its
making or maintaining of any Eurodollar Loans or its obligation to make any
Eurodollar Loans hereunder, or any reduction in any amount receivable by such
Lender hereunder in respect of any of such Loans or such obligation, resulting
from any Regulatory Change that:

                    (i)  shall subject any Lender (or its Applicable Lending
         Office for any of such Loans) to any tax, duty or other charge in
         respect of such Loans or its Revolving Credit Note or change the basis
         of taxation of any amounts payable to such Lender under this Agreement
         or its Revolving Credit Note in respect of any of such Loans
         (excluding changes in the taxation of the overall net income of such
         Lender or of such Applicable Lending Office by the jurisdiction in
         which such Lender has its principal office or such Applicable Lending
         Office), provided that this Section 5.01(a)(i) shall not apply to any
         amounts excluded pursuant to the proviso to Section 5.06(a) hereof; or

                    (ii)  imposes or modifies any reserve, special deposit or
         similar requirements (other than the Reserve Requirement utilized in
         the determination of the Eurodollar Rate for such Loan) relating to
         any extensions of credit or other assets of, or any deposits with or
         other liabilities of, such Lender (including, without limitation, any
         of such Loans or any deposits referred to in the definition of
         "Eurodollar Base Rate" in Section 1.01 hereof), or any commitment of
         such Lender (including, without limitation, the Commitment of such
         Lender hereunder); or

                    (iii) imposes any other condition affecting this Agreement 
         or its Revolving Credit Note (or any of such extensions of credit or
         liabilities) or its Commitment.







                                Credit Agreement
<PAGE>   31
                                    - 27 -

If any Lender requests compensation from the Company under this Section
5.01(a), the Company may, by notice to such Lender (with a copy to the
Administrative Agent), suspend the obligation of such Lender thereafter to make
or Continue Eurodollar Loans, or to Convert Base Rate Loans into Eurodollar
Loans, until the Regulatory Change giving rise to such request ceases to be in
effect (in which case the provisions of Section 5.04 hereof shall be
applicable), provided that such suspension shall not affect the right of such
Lender to receive the compensation so requested.

                 (b)  Without limiting the effect of the foregoing provisions
of this Section 5.01 (but without duplication), the Company shall pay directly
to each Lender from time to time on request such amounts as such Lender may
determine to be necessary to compensate such Lender (or, without duplication,
the bank holding company of which such Lender is a subsidiary) for any costs
that it determines are attributable to the maintenance by such Lender (or any
Applicable Lending Office or such bank holding company), pursuant to any law or
regulation or any interpretation, directive or request (whether or not having
the force of law and whether or not failure to comply therewith would be
unlawful) of any court or Governmental Authority (i) following any Regulatory
Change or (ii) implementing any risk-based capital guideline or other
requirement (whether or not having the force of law and whether or not the
failure to comply therewith would be unlawful) hereafter issued by any
Governmental Authority implementing at the national level the Basle Accord, of
capital in respect of its Commitment or Loans (such compensation to include,
without limitation, an amount equal to any reduction of the rate of return on
assets or equity of such Lender (or any Applicable Lending Office or such bank
holding company) to a level below that which such Lender (or any Applicable
Lending Office or such bank holding company) could have achieved but for such
law, regulation, interpretation, directive or request).

                 (c)  Each Lender shall notify the Company of any event
occurring after the date hereof entitling such Lender to compensation under
paragraph (a) or (b) of this Section 5.01 as promptly as practicable, but in
any event within 45 days, after such Lender obtains actual knowledge thereof;
provided that (i) if any Lender fails to give such notice within 45 days after
it obtains actual knowledge of such an event, such Lender shall, with respect
to compensation payable pursuant to this Section 5.01 in respect of any costs
resulting from such event, only be entitled to payment under this Section 5.01
for costs incurred from and after the date 45 days prior to the date that such
Lender does give such notice and (ii) each Lender will







                                Credit Agreement
<PAGE>   32
                                    - 28 -

designate a different Applicable Lending Office for the Loans of such Lender
affected by such event if such designation will avoid the need for, or reduce
the amount of, such compensation and will not, in the sole opinion of such
Lender, be disadvantageous to such Lender, except that such Lender shall have
no obligation to designate an Applicable Lending Office located in the United
States of America.  Each Lender will furnish to the Company a certificate
setting forth the basis and amount of each request by such Lender for
compensation under paragraph (a) or (b) of this Section 5.01.  Determinations
and allocations by any Lender for purposes of this Section 5.01 of the effect
of any Regulatory Change pursuant to paragraph (a) of this Section 5.01, or of
the effect of capital maintained pursuant to paragraph (b) of this Section
5.01, on its costs or rate of return of maintaining Loans or its obligation to
make Loans, or on amounts receivable by it in respect of Loans, and of the
amounts required to compensate such Lender under this Section 5.01, shall be
conclusive, provided that such determinations and allocations are made on a
reasonable basis.

                 5.02  Limitation on Types of Loans.  Anything herein to the
contrary notwithstanding, if, on or prior to the determination of any
Eurodollar Base Rate for any Interest Period:

                 (a)  the Administrative Agent determines, which determination
         shall be conclusive, that quotations of interest rates for the
         relevant deposits referred to in the definition of "Eurodollar Base
         Rate" in Section 1.01 hereof are not being provided in the relevant
         amounts or for the relevant maturities for purposes of determining
         rates of interest for Eurodollar Loans as provided herein; or

                 (b)  the Majority Lenders determine, which determination shall
         be conclusive, and notify the Administrative Agent that the relevant
         rates of interest referred to in the definition of "Eurodollar Base
         Rate" in Section 1.01 hereof upon the basis of which the rate of
         interest for Eurodollar Loans for such Interest Period is to be
         determined are not likely adequately to cover the cost to such Lenders
         of making or maintaining Eurodollar Loans for such Interest Period;

then the Administrative Agent shall give the Company and each Lender prompt
notice thereof and, so long as such condition remains in effect, the Lenders
shall be under no obligation to make additional Eurodollar Loans, to Continue
Eurodollar Loans or to Convert Base Rate Loans into Eurodollar Loans, and the
Company







                                Credit Agreement
<PAGE>   33
                                    - 29 -

shall, on the last day(s) of the then current Interest Period(s) for the
outstanding Eurodollar Loans, either prepay such Loans or Convert such Loans
into Base Rate Loans in accordance with Section 2.08 hereof.

                 5.03  Illegality.  Notwithstanding any other provision of this
Agreement, in the event that it becomes unlawful for any Lender or its
Applicable Lending Office to honor its obligation to make or maintain
Eurodollar Loans hereunder (and, in the sole opinion of such Lender, the
designation of a different Applicable Lending Office would either not avoid
such unlawfulness or would be disadvantageous to such Lender), then such Lender
shall promptly notify the Company thereof (with a copy to the Administrative
Agent) and such Lender's obligation to make or Continue, or to Convert Loans of
any other Type into, Eurodollar Loans shall be suspended until such time as
such Lender may again make and maintain Eurodollar Loans (in which case the
provisions of Section 5.04 hereof shall be applicable).

                 5.04  Treatment of Affected Loans.  If the obligation of any
Lender to make Eurodollar Loans or to Continue, or to Convert Base Rate Loans
into, Eurodollar Loans shall be suspended pursuant to Section 5.01 or 5.03
hereof, such Lender's Eurodollar Loans shall be automatically Converted into
Base Rate Loans on the last day(s) of the then current Interest Period(s) for
Eurodollar Loans (or, in the case of a Conversion resulting from a circumstance
described in Section 5.03 hereof, on such earlier date as such Lender may
specify to the Company with a copy to the Administrative Agent) and, unless and
until such Lender gives notice as provided below that the circumstances
specified in Section 5.01 or 5.03 hereof that gave rise to such Conversion no
longer exist:

                 (a)  to the extent that such Lender's Eurodollar Loans have
         been so Converted, all payments and prepayments of principal that
         would otherwise be applied to such Lender's Eurodollar Loans shall be
         applied instead to its Base Rate Loans; and

                 (b)  all Loans that would otherwise be made or Continued by
         such Lender as Eurodollar Loans shall be made or Continued instead as
         Base Rate Loans, and all Base Rate Loans of such Lender that would
         otherwise be Converted into Eurodollar Loans shall remain as Base Rate
         Loans.

If such Lender gives notice to the Company with a copy to the Administrative
Agent that the circumstances specified in Section 5.01 or 5.03 hereof that gave
rise to the Conversion of







                                Credit Agreement
<PAGE>   34
                                    - 30 -

such Lender's Eurodollar Loans pursuant to this Section 5.04 no longer exist
(which such Lender agrees to do promptly upon such circumstances ceasing to
exist) at a time when Eurodollar Loans made by other Lenders are outstanding,
such Lender's Base Rate Loans shall be automatically Converted, on the first
day(s) of the next succeeding Interest Period(s) for such outstanding
Eurodollar Loans, to the extent necessary so that, after giving effect thereto,
all Base Rate and Eurodollar Loans are allocated among the Lenders ratably (as
to principal amounts, Types and Interest Periods) in accordance with their
respective Commitments.

                 5.05  Compensation.  The Company shall pay to the
Administrative Agent for account of each Lender, upon the request of such
Lender through the Administrative Agent, such amount or amounts as shall be
sufficient (in the reasonable opinion of such Lender) to compensate it for any
loss (other than lost profit), cost or expense that such Lender reasonably
determines is attributable to:

                 (a)  any payment, prepayment or Conversion of a Eurodollar
         Loan made by such Lender for any reason (including, without
         limitation, the acceleration of the Loans pursuant to Section 9
         hereof) on a date other than the last day of the Interest Period for
         such Loan; or

                 (b)  any failure by the Company for any reason (including,
         without limitation, the failure of any of the conditions precedent
         specified in Section 6 hereof to be satisfied) to borrow a Eurodollar
         Loan from such Lender on the date for such borrowing specified in the
         relevant notice of borrowing given pursuant to Section 2.02 hereof.

Without limiting the effect of the preceding sentence, such compensation shall
include an amount equal to the excess, if any, of (i) the amount of interest
that otherwise would have accrued on the principal amount so paid, prepaid,
Converted or not borrowed for the period from the date of such payment,
prepayment, Conversion or failure to borrow to the last day of the then current
Interest Period for such Loan (or, in the case of a failure to borrow, the
Interest Period for such Loan that would have commenced on the date specified
for such borrowing) at the applicable rate of interest for such Loan provided
for herein (but excluding the Applicable Margin, if any) over (ii) the amount
of interest that otherwise would have accrued on such principal amount at a
rate per annum equal to the interest component of the amount such Lender would
have bid in the London interbank market for Dollar deposits of leading banks in
amounts







                                Credit Agreement
<PAGE>   35
                                    - 31 -

comparable to such principal amount and with maturities comparable to such
period (as reasonably determined by such Lender), or if such Lender shall cease
to make such bids, the equivalent rate, as reasonably determined by such
Lender, derived from Telerate Access Service Page 3750 (British Bankers
Association Settlement Rate) or other publicly available source as described in
the definition of "Eurodollar Base Rate" in Section 1.01 hereof).

                 5.06  U.S. Taxes.

                 (a)  The Company agrees to pay to each Lender that is not a
U.S. Person such additional amounts as are necessary in order that the net
payment of any amount due to such non-U.S. Person hereunder after deduction for
or withholding in respect of any U.S. Taxes imposed with respect to such
payment (or in lieu thereof, payment of such U.S. Taxes by such non-U.S.
Person), will not be less than the amount stated herein to be then due and
payable, provided that the foregoing obligation to pay such additional amounts
shall not apply:

                   (i)  to any payment to any Lender hereunder unless such
         Lender is, on the date hereof (or on the date it becomes a Lender
         hereunder as provided in Section 11.06(b) hereof) and on the date of
         any change in the Applicable Lending Office of such Lender, entitled
         to submit either a Form 1001 (relating to such Lender and entitling it
         to a complete exemption from withholding on all interest to be
         received by it hereunder in respect of the Loans) or Form 4224
         (relating to all interest to be received by such Lender hereunder in
         respect of the Loans), or

                  (ii) to any U.S. Taxes to the extent imposed by reason of the
         failure by such non-U.S. Person to comply with applicable
         certification, information, documentation or other reporting
         requirements concerning the nationality, residence, identity or
         connections with the United States of America of such non-U.S. Person
         if such compliance is required by statute or regulation of the United
         States of America as a precondition to reduction of or relief or
         exemption from such U.S. Taxes.

For the purposes of this Section 5.06(a), (A) "U.S. Person" shall mean a
citizen, national or resident of the United States of America, a corporation,
partnership or other entity created or organized in or under any laws of the
United States of America or any State thereof, or any estate or trust that is
subject to U.S. Federal income taxation regardless of the source of its income,







                                Credit Agreement
<PAGE>   36
                                    - 32 -

(B) "U.S. Taxes" shall mean any present or future tax, assessment or other
charge or levy imposed by or on behalf of the United States of America or any
taxing authority thereof or therein, (C) "Form 1001" shall mean Form 1001
(Ownership, Exemption, or Reduced Rate Certificate) of the Department of the
Treasury of the United States of America and (D) "Form 4224" shall mean Form
4224 (Exemption from Withholding of Tax on Income Effectively Connected with
the Conduct of a Trade or Business in the United States) of the Department of
the Treasury of the United States of America (or in relation to either such
Form such successor and related forms as may from time to time be adopted by
the relevant taxing authorities of the United States of America to document a
claim to which such Form relates).  Each of the Forms referred to in the
foregoing clauses (C) and (D) shall include such successor and related forms as
may from time to time be adopted by the relevant taxing authorities of the
United States of America to document a claim to which such Form relates.

                 (b)  Within 30 days after paying any amount to the
Administrative Agent or any Lender from which it is required by law to make any
deduction or withholding, and within 30 days after it is required by law to
remit such deduction or withholding to any relevant taxing or other authority,
the Company shall deliver to the Administrative Agent for delivery to such
non-U.S. Person evidence satisfactory to such Person of such deduction,
withholding or payment (as the case may be).

                 5.07  Replacement of Lenders.  If any Lender requests
compensation pursuant to Section 5.01 or 5.06 hereof, or any Lender's
obligation to make or Continue, or to Convert Loans of any Type into, the other
Type of Loan shall be suspended pursuant to Section 5.01 or 5.03 hereof (any
such Lender requesting such compensation, or whose obligations are so
suspended, being herein called a "Requesting Lender"), the Company, upon three
Business Days' notice, may require that such Requesting Lender transfer all of
its right, title and interest under this Agreement and such Requesting Lender's
Revolving Credit Note to any bank or other financial institution (a "Proposed
Lender") identified by the Company that is satisfactory to the Administrative
Agent (i) if such Proposed Lender agrees to assume all of the obligations of
such Requesting Lender hereunder, and to purchase all of such Requesting
Lender's Loans hereunder for consideration equal to the aggregate outstanding
principal amount of such Requesting Lender's Loans, together with interest
accrued thereon to the date of such purchase, and satisfactory arrangements are
made for payment to such Requesting Lender of all other amounts payable
hereunder to such Requesting Lender on or prior to the date of such transfer
(including any fees accrued hereunder and







                                Credit Agreement
<PAGE>   37
                                      - 33 -

any amounts that would be payable under Section 5 hereof as if all of such
Requesting Lender's Loans were being prepaid in full on such date) and (ii) if
such Requesting Lender has requested compensation pursuant to Section 5.01 or
5.06 hereof, such Proposed Lender's aggregate requested compensation, if any,
pursuant to said Section 5.01 or 5.06 with respect to such Requesting Lender's
Loans is lower than that of the Requesting Lender.  Subject to the provisions
of Section 11.06(b) hereof, such Proposed Lender shall be a "Lender" for all
purposes hereunder.  Without prejudice to the survival of any other agreement
of the Company hereunder the agreements of the Company contained in Sections
5.01, 5.06 and 11.03 hereof (without duplication of any payments made to such
Requesting Lender by the Company or the Proposed Lender) shall survive for the
benefit of such Requesting Lender under this Section 5.07 with respect to the
time prior to such replacement.

                 Section 6.  Conditions Precedent.

                 6.01  Effectiveness.  The effectiveness of this Agreement is
subject to the conditions precedent that the Agents shall have received the
following documents, each of which shall be satisfactory to the Agents (and to
the extent specified below, to the Lenders) in form and substance:

                 (a)  Charter Documents.  Certified copies of the LLC Agreement
         and of the certificate of incorporation and by-laws of Motorola, and
         of all corporate or other authority for each Credit Party (including,
         without limitation, board of directors resolutions and evidence of the
         incumbency, including specimen signatures, of officers) with respect
         to the execution, delivery and performance of such of the Credit
         Documents to which each Credit Party is intended to be a party and
         each other document to be delivered by such Credit Party from time to
         time in connection herewith or therewith and the Loans hereunder (and
         each Agent and each Lender may conclusively rely on such certificate
         until it receives notice in writing from the respective Credit Party
         to the contrary).

                 (b)  Revolving Credit Notes.  A Revolving Credit Note, duly
         completed and executed for each Lender.

                 (c)  Motorola Guarantee Agreement.  The Motorola Guarantee
         Agreement, duly executed and delivered by Motorola and the
         Administrative Agent.







                                Credit Agreement
<PAGE>   38
                                    - 34 -

                 (d)   Company Officer's Certificate.  A certificate of a
         senior officer of the Company, dated the Closing Date, to the effect
         that:

                       (i)  no Company Default shall have occurred and be
                 continuing; and

                       (ii)  the representations and warranties made by the
                 Company in Section 7 hereof shall be true and complete on and
                 as of the Closing Date with the same force and effect as if
                 made on and as of such date (or, if any such representation or
                 warranty is expressly stated to have been made as of a
                 specific date, as of such specific date).

                 (e)  Motorola Officer's Certificate.  A certificate of a
         senior officer of Motorola, dated the Closing Date, to the effect
         that:

                       (i)  no Motorola Default shall have occurred and be
                 continuing; and

                       (ii)  the representations and warranties made by
                 Motorola in Section 3 of the Motorola Guarantee Agreement
                 shall be true and complete on and as of the Closing Date with
                 the same force and effect as if made on and as of such date
                 (or, if any such representation or warranty is expressly
                 stated to have been made as of a specific date, as of such
                 specific date).

                 (f)  Opinion of Counsel to the Company.  An opinion, dated the
         Closing Date, of Sullivan & Cromwell, counsel to the Company,
         substantially in the form of Exhibit C hereto and covering such other
         matters as any Agent or any Lender may reasonably request (and the
         Company hereby instructs such counsel to deliver such opinion to the
         Lenders and the Agents).

                 (g)  Opinions of Counsel to Motorola.  (i) An opinion, dated
         the Closing Date, of James Markey, Esq., counsel to Motorola, and (ii)
         an opinion, dated the Closing Date, of Kirkland & Ellis, special New
         York counsel to Motorola, substantially in the forms of Exhibits D-1
         and D-2 hereto, respectively, and covering such other matters as any
         Agent or any Lender may reasonably request (and Motorola hereby
         instructs such counsel to deliver such opinions to the Lenders and the
         Agents).







                                Credit Agreement
<PAGE>   39
                                    - 35 -

                 (h)  Opinion of Special New York Counsel to Global Arrangers.
         An opinion, dated the Closing Date, of Milbank, Tweed, Hadley &
         McCloy, special New York counsel to the Global Arrangers,
         substantially in the form of Exhibit E hereto (and the Global
         Arrangers hereby instruct such counsel to deliver such opinion to the
         Lenders and the Agents).

                 (i)  Other Documents.  Such other documents as any Agent or
         any Lender or special New York counsel to the Global Arrangers may
         reasonably request.

The effectiveness of this Agreement is also subject to the payment by the
Company of such fees and expenses as the Company shall have agreed to pay or
deliver to the Global Arrangers, any Lender and/or any Agent in connection
herewith, including, without limitation, the reasonable fees and expenses of
Milbank, Tweed, Hadley & McCloy, special New York counsel to the Global
Arrangers, in connection with the negotiation, preparation, execution and
delivery of this Agreement, the Revolving Credit Notes and the other Credit
Documents and the making of the Loans hereunder (to the extent that statements
for such fees and expenses have been delivered to the Company).

                 6.02  Initial and Subsequent Loans.  The obligation of the
Lenders to make any Loan to the Company upon the occasion of each borrowing
hereunder (including the initial borrowing) is subject to the further
conditions precedent that, both immediately prior to the making of such Loan
and also after giving effect thereto and to the intended use thereof:

                 (a)  no Company Default shall have occurred and be continuing;

                 (b)  the representations and warranties made by the Company in
         Section 7 hereof shall be true and complete on and as of the date of
         the making of such Loan with the same force and effect as if made on
         and as of such date (or, if any such representation or warranty is
         expressly stated to have been made as of a specific date, as of such
         specific date);

                 (c)  no Motorola Default shall have occurred and be
         continuing;

                 (d)  the representations and warranties made by Motorola in
         Section 3 of the Motorola Guarantee Agreement shall be true and
         complete on and as of the date of the







                                Credit Agreement
<PAGE>   40
                                    - 36 -

         making of such Loan with the same force and effect as if made on and
         as of such date (or, if any such representation or warranty is
         expressly stated to have been made as of a specific date, as of such
         specific date); and

                 (e)  the Aggregate Projected Loan Amount, determined as of
         such borrowing date (after giving effect to such borrowing), shall not
         exceed $745,000,000.

Each notice of borrowing by the Company hereunder shall constitute a
certification (i) by the Company to the effect set forth in clauses (a), (b)
and (e) above and (ii) by Motorola to the effect set forth in clauses (c) and
(d) of the preceding sentence (in each case, both as of the date of such notice
and, unless the Company or Motorola, respectively, otherwise notifies the
Administrative Agent prior to the date of such borrowing, as of the date of
such borrowing).

                 Section 7.  Representations and Warranties.  The Company
represents and warrants to the Agents and the Lenders that:

                 7.01  Legal Existence.  Each of the Company and its
Subsidiaries: (a) is a limited liability company, corporation, partnership or
other entity duly organized, validly existing and in good standing under the
laws of the jurisdiction of its organization; (b) has all requisite corporate
or other power, and has all material Governmental Approvals necessary, to own
its assets and carry on its business as now being or as proposed to be
conducted with such exceptions as could not reasonably be likely (either
individually or in the aggregate) to have a Material Adverse Effect; and (c) is
qualified to do business and is in good standing in all jurisdictions in which
the nature of the business conducted by it makes such qualification necessary
and where failure so to qualify could reasonably be likely (either individually
or in the aggregate) to have a Material Adverse Effect.

                 7.02  Financial Condition.  The Company has heretofore
furnished to each of the Lenders the balance sheet of the Company as at
December 31, 1995 and the related statements of income, retained earnings and
cash flows of the Company for the fiscal year ended on said date, with the
opinion thereon of KPMG Peat Marwick LLP, and the unaudited balance sheet of
the Company as at June 30, 1996 and the related statements of income, retained
earnings and cash flows of the Company for the six-month period ended on such
date.  All such financial statements present







                                Credit Agreement
<PAGE>   41
                                    - 37 -

fairly, in all material respects, the financial condition of the Company, as at
said dates and the results of its operations for the fiscal year and six-month
period ended on said dates (subject, in the case of such financial statements
as at June 30, 1996, to normal year-end audit adjustments), all in accordance
with generally accepted accounting principles and practices applied on a
consistent basis.  Since December 31, 1995, there has been no material adverse
change in the financial condition, operations or business of the Company from
that set forth in said financial statements as at said date, except such as
could not reasonably be likely (either individually or in the aggregate) to
have a Material Adverse Effect.

                 7.03  Litigation.  Except as set forth in Schedule III hereto,
there are no legal or arbitral proceedings, or any proceedings by or before any
Governmental Authority, now pending or (to the knowledge of the Company)
threatened against the Company or any of its Subsidiaries that could reasonably
be likely (either individually or in the aggregate) to have a Material Adverse
Effect.

                 7.04  No Breach.  None of the execution and delivery of the
Credit Documents to which it is a party, the consummation of the transactions
herein and therein contemplated or compliance with the terms and provisions
hereof and thereof will conflict with or result in a breach of, or require any
consent (other than any consent which has been obtained and is in full force
and effect) under, the LLC Agreement, or any applicable law or regulation, or
any order, writ, injunction or decree of any court or Governmental Authority,
or any agreement or instrument to which the Company or any of its Subsidiaries
is a party or by which any of them or any of their Property is bound or to
which any of them is subject, or constitute a default under any such agreement
or instrument, or result in the creation or imposition of any Lien upon any
Property of the Company or any of its Subsidiaries pursuant to the terms of any
such agreement or instrument (other than any Liens in favor of Motorola).

                 7.05  Action.  The Company has all necessary power, authority
and legal right to execute, deliver and perform its obligations under each of
the Credit Documents to which it is a party; the execution, delivery and
performance by the Company of each of the Credit Documents to which it is a
party have been duly authorized by all necessary action on its part (including,
without limitation, any required member or shareholder approvals); and this
Agreement has been duly and validly executed and delivered by the Company and
constitutes, and each of the Revolving Credit Notes when executed and delivered
for value will







                                Credit Agreement
<PAGE>   42
                                    - 38 -

constitute, its legal, valid and binding obligation, enforceable against the
Company in accordance with its terms, subject to bankruptcy, insolvency,
reorganization, moratorium or similar laws of general applicability affecting
the enforcement of creditors' rights.

                 7.06  Approvals.  No authorizations, approvals or consents of,
and no filings or registrations with, any Governmental Authority, or any
securities exchange, are necessary for the execution, delivery or performance
by the Company of any of the Credit Documents to which it is a party or for the
legality, validity or enforceability hereof or thereof.

                 7.07  Use of Credit.  Neither the Company nor any of its
Subsidiaries is engaged principally, or as one of its important activities, in
the business of extending credit for the purpose, whether immediate, incidental
or ultimate, of buying or carrying Margin Stock, and no part of the proceeds of
the Loans hereunder will be used to buy or carry any Margin Stock.

                 7.08  ERISA.  Each Plan, and, to the knowledge of the Company,
each Multiemployer Plan, of the Company is in material compliance with, and has
been administered in material compliance with, the applicable provisions of
ERISA, the U.S. Tax Code and any other U.S. Federal or State law.  No event or
condition has occurred and is continuing as to which the Company would be under
an obligation to furnish a report to the Administrative Agent under Section
8.01(d) hereof (other than any event or condition as to which a report has been
given).

                 7.09  Taxes.  The Company and its Subsidiaries have filed all
U.S. Federal income tax returns and all other material tax returns and
information statements that are required to be filed by them and have paid all
taxes due pursuant to such returns or pursuant to any assessment received by
the Company or any of its Subsidiaries, except for any such tax being contested
in good faith and by proper proceedings and as to which adequate reserves have
been set aside by the Company in accordance with GAAP.  The charges, accruals
and reserves on the books of the Company and its Subsidiaries in respect of
taxes and other governmental charges are, in the opinion of the Company,
adequate.

                 7.10  Investment Company Act.  Neither the Company nor any of
its Subsidiaries is an "investment company", or a company "controlled" by a
company registered as an "investment company", as such terms are defined in the
Investment Company Act of 1940, as amended.







                                Credit Agreement
<PAGE>   43
                                    - 39 -

                 7.11  Public Utility Holding Company Act.  Neither the Company
nor any of its Subsidiaries is a "holding company", or an "affiliate" of a
"holding company" or a "subsidiary company" of a "holding company", within the
meaning of the Public Utility Holding Company Act of 1935, as amended.

                 7.12  Capitalization.  The Company has heretofore delivered to
the Agents a true and complete copy of the LLC Agreement.  The only members of
the Company on the date hereof are identified in Part A of Schedule IV hereto.
As of the date hereof, (a) except as identified in Part B of Schedule IV
hereto, there are no outstanding Equity Rights with respect to the Company and
(b) except as identified in said Part B, there are no outstanding obligations
of the Company or any of its Subsidiaries to repurchase, redeem, or otherwise
acquire any equity interests of the Company nor are there any outstanding
obligations of the Company or any of its Subsidiaries to make payments to any
Person, such as "phantom stock" payments, where the amount thereof is
calculated with reference to the fair market value or equity value of the
Company or any of its Subsidiaries.

                 7.13  Subsidiaries and Certain Investments.  Set forth in (a)
Part A of Schedule V hereto is a complete and correct list of all Subsidiaries
of the Company on the date hereof and (b) Part B of Schedule V hereto is a
complete and correct list of all Investments (other than Permitted Investments
and Investments identified in said Part A) held by the Company or any of its
Subsidiaries in any Person on the date hereof and, for each such Investment,
the identity of the Person or Persons holding such Investment and the nature of
such Investment.

                 7.14  True and Complete Disclosure.  The information, reports,
financial statements, exhibits and schedules (other than projections) furnished
in writing by or on behalf of the Company to any Agent or any Lender in
connection with the negotiation, preparation or delivery of this Agreement and
the other Credit Documents or included herein or therein or delivered pursuant
hereto or thereto (other than projections), when taken as a whole (together
with the Information Memorandum) do not contain any untrue statement of
material fact or omit to state any material fact necessary to make the
statements herein or therein, in light of the circumstances under which they
were made, not misleading.  The projections, estimates and/or pro forma
financial statements furnished by or on behalf of the Company to the Agents or
any Lender in connection with the negotiation, execution and delivery of this
Agreement and the other Credit Documents or included herein or therein or
delivered pursuant hereto or thereto, have been prepared by the Company in good
faith on the basis of







                                Credit Agreement
<PAGE>   44
                                    - 40 -

information and assumptions that the Company believed to be reasonable as of
the date of such information.  All written information furnished after the date
hereof by the Company and its Subsidiaries to the Agents and the Lenders in
connection with this Agreement and the other Credit Documents and the
transactions contemplated hereby and thereby will not contain any untrue
statement of material fact or omit to state any material fact necessary to make
the statements therein, in light of the circumstances under which they were
made, not misleading, or (in the case of projections, estimates and pro forma
financial statements) will be prepared in good faith on the basis of
information and assumptions believed by the Company to be reasonable as of the
date of such information.  There is no fact known to the Company that could
reasonably be likely to have a Material Adverse Effect that has not been
disclosed herein, in the other Credit Documents or in a report, financial
statement, exhibit, schedule, disclosure letter or other writing furnished to
the Lenders for use in connection with the transactions contemplated hereby or
thereby.

                 Section 8.  Covenants of the Company.  The Company covenants
and agrees with the Lenders and the Agents that, so long as any Commitment or
Loan is outstanding and until payment in full of all amounts payable by the
Company hereunder:

                 8.01  Financial Statements Etc.  The Company shall deliver to
the Administrative Agent:

                 (a)  as soon as available and in any event within 60 days
         after the end of each of the first three quarterly fiscal periods of
         each fiscal year of the Company, consolidated statements of income,
         retained earnings and cash flows of the Company and its Subsidiaries
         for such period and for the period from the beginning of the
         respective fiscal year to the end of such period, and the related
         consolidated balance sheet of the Company and its Subsidiaries as at
         the end of such period, setting forth in each case in comparative form
         the corresponding consolidated figures for the corresponding periods
         in the preceding fiscal year (except that, in the case of balance
         sheets, such comparison shall be to the last day of the prior fiscal
         year), accompanied by a certificate of a senior financial officer of
         the Company, which certificate shall state that said consolidated
         financial statements present fairly, in all material respects, the
         consolidated financial condition and results of operations of the
         Company and its Subsidiaries, in each case in accordance with
         generally







                                Credit Agreement
<PAGE>   45
                                    - 41 -

         accepted accounting principles, consistently applied, as at the end
         of, and for, such period (subject to normal year-end audit
         adjustments);

                 (b)  as soon as available and in any event within 120 days
         after the end of each fiscal year of the Company, consolidated
         statements of income, retained earnings and cash flows of the Company
         and its Subsidiaries for such fiscal year and the related consolidated
         balance sheet of the Company and its Subsidiaries as at the end of
         such fiscal year, setting forth in each case in comparative form the
         corresponding consolidated figures for the preceding fiscal year (and
         accompanied by an opinion thereon of KPMG Peat Marwick LLP or other
         independent certified public accountants of recognized national
         standing, which opinion shall state that said consolidated financial
         statements present fairly, in all material respects, the consolidated
         financial condition and results of operations of the Company and its
         Subsidiaries as at the end of, and for, such fiscal year in accordance
         with generally accepted accounting principles), in each case in
         accordance with generally accepted accounting principles, consistently
         applied, as at the end of, and for, such fiscal year;

                 (c)  promptly upon their becoming available, copies of all
         registration statements and regular periodic reports, if any, that the
         Company shall have filed with the Securities and Exchange Commission
         (or any governmental agency substituted therefor) or any national
         securities exchange;

                 (d)  promptly after the Company knows or has reason to believe
         that any of the events or conditions specified below with respect to
         any Plan or Multiemployer Plan of the Company (which events or
         conditions, either individually or in the aggregate, could reasonably
         be likely to have a Material Adverse Effect) has occurred or exists, a
         statement signed by a senior financial officer of the Company setting
         forth details respecting such event or condition and the action, if
         any, that the Company or its ERISA Affiliate proposes to take with
         respect thereto (and a copy of any report or notice filed with or
         given to the PBGC by the Company or an ERISA Affiliate of the Company
         with respect to such event or condition):

                       (i)  any reportable event, as defined in Section 4043(c)
                 of ERISA and the regulations issued thereunder, with respect
                 to a Plan of the Company, as to which the PBGC has not by
                 regulation waived the







                                Credit Agreement
<PAGE>   46
                                    - 42 -

                 requirement of Section 4043(a) of ERISA that it be notified
                 within 30 days of the occurrence of such event (provided that
                 a failure to meet the minimum funding standard of Section 412
                 of the U.S. Tax Code or Section 302 of ERISA, including,
                 without limitation, the failure to make on or before its due
                 date a required installment under Section 412(m) of the U.S.
                 Tax Code or Section 302(e) of ERISA, shall be a reportable
                 event regardless of the issuance of any waivers in accordance
                 with Section 412(d) of the U.S. Tax Code); and any request for
                 a waiver under Section 412(d) of the U.S. Tax Code for any
                 Plan of the Company;

                          (ii)  the distribution under Section 4041 of ERISA of
                 a notice of intent to terminate any Plan of the Company or any
                 action taken by the Company or an ERISA Affiliate of the
                 Company to terminate any Plan of the Company (other than
                 pursuant to Section 4041(b) of ERISA);

                          (iii) the institution by the PBGC of proceedings
                 under Section 4042 of ERISA for the termination of, or the
                 appointment of a trustee to administer, any Plan of the
                 Company, or the receipt by the Company or any ERISA Affiliate
                 of the Company of a notice from a Multiemployer Plan of the
                 Company that such action has been taken by the PBGC with
                 respect to such Multiemployer Plan;

                          (iv)  the complete or partial withdrawal from a
                 Multiemployer Plan of the Company by the Company or any ERISA
                 Affiliate of the Company that results in liability under
                 Section 4201 or 4204 of ERISA (including the obligation to
                 satisfy secondary liability as a result of a purchaser
                 default) or the receipt by the Company or any ERISA Affiliate
                 of the Company of notice from a Multiemployer Plan of the
                 Company that it is in reorganization or insolvency pursuant to
                 Section 4241 or 4245 of ERISA or that it intends to terminate
                 or has terminated under Section 4041A of ERISA;

                          (v)   the institution of a proceeding by a fiduciary
                 of any Multiemployer Plan of the Company against the Company
                 or any ERISA Affiliate of the Company to enforce Section 515
                 of ERISA, which proceeding is not dismissed within 30 days;
                 and







                                Credit Agreement
<PAGE>   47
                                    - 43 -

                          (vi)  the adoption of an amendment to any Plan of the
                 Company that, pursuant to Section 401(a)(29) of the U.S. Tax
                 Code or Section 307 of ERISA, would result in the loss of
                 tax-exempt status of the trust of which such Plan is a part if
                 the Company or an ERISA Affiliate of the Company fails to
                 timely provide security to such Plan in accordance with the
                 provisions of said Sections;

                 (e)  promptly after the Company knows or has reason to believe
         that any Default has occurred, a notice of such Default describing the
         same in reasonable detail and, together with such notice or as soon
         thereafter as possible, a description of the action that the Company
         has taken or proposes to take with respect thereto; and

                 (f)  from time to time such other information regarding the
         financial condition, operations or business of the Company or any of
         its Subsidiaries as any Lender (through the Administrative Agent) or
         any Agent may reasonably request.

The Company will furnish to the Administrative Agent, at the time it furnishes
each set of financial statements pursuant to paragraph (a) or (b) above, a
certificate of a senior financial officer of the Company (i) to the effect that
no Default has occurred and is continuing (or, if any Default has occurred and
is continuing, describing the same in reasonable detail and describing the
action that the Company has taken or proposes to take with respect thereto) and
(ii) setting forth in reasonable detail the computations, if any, necessary to
determine whether the Company is in compliance with Sections 8.07, 8.08 and
8.09 hereof as of the end of the respective quarterly fiscal period or fiscal
year.  Upon receipt of any financial statement, notice or other information
from the Company under this Section 8.01, the Administrative Agent shall
promptly deliver a copy of the same to each of the Lenders.

                 8.02  Litigation.  The Company will promptly give to each
Lender notice of all legal or arbitral proceedings, and of all proceedings by
or before any Governmental Authority, and any material development in respect
of such legal or other proceedings, affecting the Company or any of its
Subsidiaries, except proceedings that, if adversely determined, could not
reasonably be likely (either individually or in the aggregate) to have a
Material Adverse Effect.  Without limiting the generality of the foregoing, the
Company will give to each Lender notice of the assertion of any environmental
matter by any Person against,





                                Credit Agreement
<PAGE>   48
                                    - 44 -

or with respect to the activities of, the Company or any of its Subsidiaries
and notice of any alleged violation of or non-compliance with any Environmental
Laws or any permits, licenses or authorizations, other than any environmental
matter or alleged violation that, if adversely determined, could not reasonably
be likely (either individually or in the aggregate) to have a Material Adverse
Effect.

                 8.03  Existence, Etc.  The Company will, and will cause each
of its Subsidiaries to:

                 (a)  preserve and maintain its legal existence and all of its
         material rights, privileges, licenses, approvals, consents and
         franchises, including, without limitation, all material permits,
         licenses and authorizations required from time to time to be obtained
         under applicable Environmental Laws, provided that nothing in this
         Section 8.03 shall prohibit any transaction expressly permitted under
         Section 8.05 hereof;

                 (b)  comply with the requirements of all applicable laws
         (including, without limitation, Environmental Laws), rules,
         regulations and orders of Governmental Authorities if failure to
         comply with such requirements could reasonably be likely (either
         individually or in the aggregate) to have a Material Adverse Effect;

                 (c)  pay and discharge all material taxes, assessments and
         governmental charges or levies imposed on it or on its income or
         profits or on any of its Property prior to the date on which penalties
         attach thereto, except for any such tax, assessment, charge or levy
         the payment of which is being contested in good faith and by proper
         proceedings and against which, in the opinion of the Company, adequate
         reserves are being maintained;

                 (d)  maintain all of its Properties used or useful in its
         business in good working order and condition, ordinary wear and tear
         excepted, provided that nothing in this Section 8.03(d) shall prevent
         the Company or any of its Subsidiaries from discontinuing such
         maintenance if such discontinuance is, in the judgment of the Company,
         desirable in the conduct of its business and the business of any of
         its Subsidiaries and not disadvantageous in any material respect to
         the Lenders;

                 (e)  keep adequate records and books of account, in which
         complete entries will be made in accordance with







                                Credit Agreement
<PAGE>   49
                                    - 45 -

         generally accepted accounting principles consistently applied; and

                 (f)  permit representatives of any Lender or any Agent, during
         normal business hours and upon reasonable notice, to examine, copy and
         make extracts from its books and records, to inspect any of its
         Properties, and to discuss its business and affairs with its officers,
         all to the extent reasonably requested by such Lender or Agent (as the
         case may be).

                 8.04  Insurance.  The Company will, and will cause each of its
Subsidiaries to, maintain insurance with financially sound and reputable
insurance companies, and with respect to Property and risks of a character
usually maintained by entities engaged in the same or similar business
similarly situated, against loss, damage and liability of the kinds and in the
amounts customarily maintained by such entities.

                 8.05  Prohibition of Fundamental Changes.  The Company shall
not consolidate with or merge into any other Person or convey, transfer or
lease its Property substantially as an entirety to any Person, and the Company
shall not permit any Person to consolidate with or merge into it or convey,
transfer or lease its Property substantially as an entirety to it, except that
the Company may transfer all or substantially all of the assets of the Company
to a Wholly Owned Subsidiary (which, for this purpose, may include a limited
liability company which is at least 99% directly owned by the Company),
provided that, at the time of such transfer and after giving effect thereto,
(a) no Default shall have occurred and be continuing, (b) such Subsidiary shall
be organized under the laws of the United States or any State thereof, (c)
concurrently with such transfer, Motorola and the Administrative Agent shall
have entered into the amendments to the Motorola Guarantee Agreement referred
to in Section 4.07(a) thereof and (d) concurrently with such transfer, such
Subsidiary shall assume in writing all of the obligations of the Company under
this Agreement and the Revolving Credit Notes and the Company shall be released
therefrom, and thereafter (unless the context otherwise requires) references
herein or in the other Credit Documents to "the Company" shall be deemed to
refer to such Subsidiary (and the Company, such Subsidiary, the Lenders and the
Agents shall enter into such amendments to this Agreement as shall be
reasonably requested by the Administrative Agent or the Company to give effect
to the foregoing).

                 8.06  Limitation on Liens.  The Company will not, nor will it
permit any of its Subsidiaries to, create, incur, assume







                                Credit Agreement
<PAGE>   50
                                    -46 -

or suffer to exist any Lien upon any of its Property, whether now owned or
hereafter acquired, except:

                 (a)  Liens in existence on the date hereof and Liens in favor
         of Motorola, the Company or any of its Subsidiaries;

                 (b)  Liens imposed by any Governmental Authority for taxes,
         assessments or charges not yet due or that are being contested in good
         faith and by appropriate proceedings if, in the opinion of the
         Company, adequate reserves with respect thereto are maintained on the
         books of the Company or the affected Subsidiaries, as the case may be,
         in accordance with GAAP;

                 (c)  carriers', warehousemen's, mechanics', materialmen's,
         repairmen's, landlords' or other like Liens arising in the ordinary
         course of business that are not overdue for a period of more than 30
         days or that are being contested in good faith and by appropriate
         proceedings and Liens securing judgments but only to the extent for an
         amount and for a period not resulting in an Event of Default under
         Section 9(e) hereof;

                 (d)  pledges or deposits under worker's compensation,
         unemployment insurance and other social security legislation;

                 (e)  deposits to secure the performance of bids, trade
         contracts (other than for Indebtedness), leases, utilities, statutory
         obligations, surety and appeal bonds, performance bonds and other
         obligations of a like nature incurred in the ordinary course of
         business;

                 (f)  easements, rights-of-way, restrictions and other similar
         encumbrances incurred in the ordinary course of business and
         encumbrances consisting of zoning restrictions, easements, licenses,
         restrictions on the use of Property or minor defects, irregularities
         or imperfections in title, and encumbrances and statutory Liens, that,
         in the aggregate, are not material in amount, and that do not in any
         case materially detract from the value of the Property subject thereto
         or interfere with the ordinary conduct of the business of the Company
         or any of its Subsidiaries;

                 (g)  Liens in favor of any Governmental Authority to secure
         progress, advance or other payments, or pursuant to any contract,
         license, permit or provision of any statute;







                                Credit Agreement
<PAGE>   51
                                    - 47 -

                 (h)  Liens on Property existing at the time of acquisition
         thereof (including acquisition through merger or consolidation);

                 (i)  bankers' Liens arising out of or with respect to the
         credit balance maintained by the Company in one or more deposit
         accounts to the extent not prohibited by Section 8.08 hereof;

                 (j)  Liens on Property to secure the payment of all or any
         part of the purchase price or construction cost thereof or to secure
         any Indebtedness incurred prior to, at the time of, or within 180 days
         after, the acquisition of such Property, the completion of any
         construction or the commencement of full operation, for the purpose of
         financing all or any part of the purchase price or construction cost
         thereof;

                 (k)  Liens in connection with any Capital Lease Obligation not
         prohibited pursuant to Section 8.07 hereof; and

                 (l)  any extension, renewal or replacement (or successive
         extensions, renewals or replacements), as a whole or in part, of any
         Lien referred to in the foregoing clauses (a) through (k), inclusive,
         provided that such extension, renewal or replacement Lien shall be
         limited to all or a part of the same Property secured by the Lien so
         extended, renewed or replaced (plus improvements on such Property).

                 8.07  Indebtedness.  The Company will not, nor will it permit
any of its Subsidiaries to, create, incur or suffer to exist any Indebtedness
except:

                 (a)  Indebtedness to the Lenders hereunder;

                 (b)  Indebtedness outstanding on the date hereof and
         identified in Schedule VI hereto;

                 (c)  Indebtedness of the Company or any of its Subsidiaries to
         Motorola;

                 (d)  Indebtedness of Subsidiaries of the Company to the
         Company or to other Subsidiaries of the Company;

                 (e)  Indebtedness secured by a Lien permitted under Section
         8.06 hereof;







                                Credit Agreement
<PAGE>   52
                                    - 48 -

                 (f)  Indebtedness that by its terms is subordinated in right
         of payment to the Loans (the terms of which shall be approved by the
         Global Arrangers, which approval shall not be unreasonably withheld);

                 (g)  Indebtedness that by its terms ranks pari passu to the
         Loans in right of payment, provided that, immediately after giving
         effect to the incurrence of such Indebtedness and the receipt and
         application of the proceeds thereof, the sum of the aggregate
         outstanding principal amount of Indebtedness of the Company and its
         Subsidiaries incurred pursuant to this Agreement and this paragraph
         (g) would be less than $2,600,000,000;

                 (h)  Indebtedness incurred or given in exchange for, or the
         proceeds of which are used to, extend, refinance, renew, replace,
         substitute, defease or refund any Indebtedness outstanding on the date
         hereof or incurred by the Company or any of its Subsidiaries in
         accordance with the terms of this Agreement (other than pursuant to
         paragraph (c) of this Section 8.07), provided that such Indebtedness
         does not exceed the amount of Indebtedness being so extended,
         refinanced, renewed, replaced, substituted, defeased or refunded; and

                 (i)  obligations of the Company in respect of (i) the Space
         System Contract effective July 29, 1993, (ii) the Operations and
         Maintenance Contract effective July 29, 1993 and (iii) the Terrestrial
         Network Development Contract effective January 1, 1993, in each case
         between the Company and Motorola and as amended and in effect from
         time to time.

                 8.08  Investments.  The Company will not, nor will it permit
any of its Subsidiaries to, make or permit to remain outstanding any
Investments except:

                 (a)  Investments outstanding on the date hereof and identified
         in Schedule V hereto;

                 (b)  deposit accounts with banks;

                 (c)  Permitted Investments;

                 (d)  Investments by the Company and its Subsidiaries in the
         Company and its Subsidiaries; and

                 (e)  other Investments in an aggregate outstanding amount not
         at any time exceeding $100,000,000 (measured by







                                Credit Agreement
<PAGE>   53
                                    - 49 -

         the amount of each such Investment as of the time such Investment is
         made).

                 8.09  Restricted Payments.  The Company will not, nor will it
permit any of its Subsidiaries to, declare or make any Restricted Payment at
any time, except that:

                 (a)  the Company may effect the transfer of assets expressly
         permitted under Section 8.05 hereof;

                 (b)  so long as no Default shall have occurred and be
         continuing, the Company may make distributions to its members pursuant
         to Section 3.07(c) of the LLC Agreement with respect to the members'
         U.S. tax liability, and any Wholly Owned Subsidiary to which the
         assets of the Company shall have been transferred pursuant to Section
         8.05 hereof may make distributions to the Company (and its other
         member or members) for the purpose of enabling the Company to make
         distributions required to be made under said Section 3.07(c); and

                 (c)  the Company may make payments (but no prepayments) of
         principal of and interest on Indebtedness incurred under Section
         8.07(f) hereof as required in accordance with the terms thereof, but
         only, in each case, to the extent required by (and subject to the
         subordination provisions applicable thereto) the indenture or other
         agreement pursuant to which such Indebtedness was issued.

Except as expressly limited by the preceding sentence, nothing herein shall be
deemed to prohibit the payment of distributions or dividends by any Subsidiary
of the Company to the Company or to any other Subsidiary of the Company.

                 8.10  Lines of Business.  The Company will not, nor will it
permit any of its Subsidiaries to, engage to any substantial extent in any line
or lines of business activity other than the business of operating a global
wireless satellite-based communications system and related businesses
(including activities relating to the financing of such businesses).

                 8.11  Transactions with Affiliates.  Except as expressly
permitted by this Agreement, the Company will not, nor will it permit any of
its Subsidiaries to, directly or indirectly:  (a) make any Investment in an
Affiliate; (b) transfer, sell, lease, assign or otherwise dispose of any
Property to an Affiliate; or (c) merge into or consolidate with or purchase or
acquire Property from an Affiliate; provided that







                                Credit Agreement
<PAGE>   54
                                    - 50 -

the Company and its Subsidiaries may enter into any such transaction not
otherwise prohibited by the terms of this Agreement (i) provided for and
pursuant to any agreements that the Company is or will be a party to in
connection with the development, construction, installation, ownership and
maintenance of the Project, (ii) if the monetary or business consideration
arising therefrom would, in the opinion of the Company, be substantially as
advantageous to the Company and its Subsidiaries as the monetary or business
consideration that would obtain in a comparable transaction with a Person not
an Affiliate or (iii) provided that the aggregate amount of all such
transactions (other than any such permitted under clauses (i) and (ii) above)
does not exceed $10,000,000 in the aggregate.

                 8.12  Use of Proceeds.  The Company will use the proceeds of
the Loans hereunder solely (i) to make payments to Motorola at the times and in
the amounts required pursuant to the contracts referred to in Section 8.07(i)
hereof, (ii) to make payments of other Project-related costs and expenses,
(iii) to pay fees and expenses payable to the Global Arrangers, the Agents and
the Lenders in connection with this Agreement and (iv) for other general
purposes of the Company (in each case, in compliance with all applicable legal
and regulatory requirements, including, without limitation, Regulations G, T, U
and X and the Securities Act of 1933 and the Securities Exchange Act of 1934
and the regulations thereunder); provided that neither any Agent nor any Lender
shall have any responsibility as to the use of any of such proceeds.

                 8.13  Certain Obligations Respecting Subsidiaries.  The
Company will not permit any of its Subsidiaries to enter into, after the date
hereof, any indenture, agreement, instrument or other arrangement that,
directly or indirectly, prohibits or restrains, or has the effect of
prohibiting or restraining, or imposes materially adverse conditions upon, the
incurrence or payment of Indebtedness owed to the Company or any other
Subsidiary of the Company, the granting of Liens, the declaration or payment of
dividends, the making of loans, advances or Investments to or in the Company or
any other Subsidiary of the Company or the sale, assignment, transfer or other
disposition of Property.

                 8.14  Modifications of LLC Agreement.  The Company will not
consent to any modification, supplement or waiver of any of the provisions of
the LLC Agreement that could reasonably be likely to adversely affect the
interests of the Lenders.  Promptly following the execution and delivery of
each modification, supplement or waiver relating to the LLC Agreement,







                                Credit Agreement
<PAGE>   55
                                    - 51 -

the Company shall furnish a copy thereof to the Administrative Agent.

                 Section 9.  Events of Default.  If one or more of the
following events (herein called "Events of Default") shall occur and be
continuing:

                 (a)  The Company shall:  (i) default in the payment of any
         principal of any Loan when due (whether at stated maturity or at
         prepayment); or (ii) default in the payment of any interest on any
         Loan or any fee payable by it hereunder or under any other Credit
         Document when due and such default shall have continued unremedied for
         three or more Business Days; or (iii) default in the payment of any
         other amount payable by it hereunder when due and such default shall
         have continued unremedied for fifteen or more days; or

                 (b)  The Company or any of its Subsidiaries shall default in
         the payment when due (after the expiration of applicable grace
         periods) of any principal of or interest on any of its other
         Indebtedness having an outstanding principal amount of $10,000,000
         individually or in the aggregate; or any event specified in any note,
         agreement, indenture or other document evidencing or relating to any
         such Indebtedness shall occur if the effect of such event is to cause,
         or (with the giving of any notice or the lapse of time or both) to
         permit the holder or holders of such Indebtedness (or a trustee or
         agent on behalf of such holder or holders) to cause, such Indebtedness
         to become due, or to be prepaid in full (whether by redemption,
         purchase, offer to purchase or otherwise), prior to its stated
         maturity or to have the interest rate thereon reset to a level so that
         securities evidencing such Indebtedness trade at a level specified in
         relation to the par value thereof; or

                 (c)  Any representation, warranty or certification made or
         deemed made by the Company herein (or in any modification or
         supplement hereto), or in any certificate furnished to any Lender or
         any Agent pursuant to the provisions hereof, shall prove to have been
         false or misleading as of the time made or furnished in any material
         respect; or

                 (d)  The Company shall default in the performance of any of
         its obligations under any of Sections 8.01(e) (with respect to Company
         Defaults only), 8.05, 8.07, 8.09 or 8.12 hereof or the first sentence
         of Section 8.14 hereof; or the






                                Credit Agreement
<PAGE>   56
                                    - 52 -

         Company shall default in the performance of any of its other
         obligations in this Agreement and such default shall continue
         unremedied for a period of 30 or more days after notice thereof to the
         Company by the Administrative Agent or any Lender (through the
         Administrative Agent); or

                 (e)  A final judgment or judgments for the payment of money of
         $10,000,000 or more in the aggregate (exclusive of judgment amounts
         fully covered by insurance where the insurer has admitted liability in
         respect of such judgment) shall be rendered by one or more courts,
         administrative tribunals or other bodies having jurisdiction against
         the Company or any of its Subsidiaries and the same shall not be
         discharged (or provision shall not be made for such discharge), or a
         stay of execution thereof shall not be procured, within 30 days from
         the date of entry thereof and the Company or the relevant Subsidiary
         shall not, within said period of 30 days, or such longer period during
         which execution of the same shall have been stayed, appeal therefrom
         and cause the execution thereof to be stayed during such appeal; or

                 (f)  Motorola or any of the Motorola Domestic Subsidiaries
         shall admit in writing its inability to, or be generally unable to,
         pay its debts as such debts become due; or

                 (g)  The Company, or one or more Subsidiaries which,
         individually or in the aggregate, have at least 10% of the assets or
         revenues of the Company and its Subsidiaries taken as a whole, or
         Motorola or any of the Motorola Domestic Subsidiaries, shall (i) apply
         for or consent to the appointment of, or the taking of possession by,
         a receiver, custodian, trustee, examiner or liquidator of itself or of
         all or a substantial part of its Property, (ii) make a general
         assignment for the benefit of its creditors, (iii) commence a
         voluntary case under the U. S. Bankruptcy Code, (iv) file a petition
         seeking to take advantage of any other law relating to bankruptcy,
         insolvency, reorganization, liquidation, dissolution, arrangement or
         winding-up, or composition or readjustment of debts, (v) fail to
         controvert in a timely and appropriate manner, or acquiesce in writing
         to, any petition filed against it in an involuntary case under the
         U.S. Bankruptcy Code or (vi) take any corporate or other analogous
         action for the purpose of effecting any of the foregoing; or







                                Credit Agreement
<PAGE>   57
                                    - 53 -

                 (h)  A proceeding or case shall be commenced, without the
         application or consent of the Company, or one or more Subsidiaries
         which, individually or in the aggregate, have at least 10% of the
         assets or revenues of the Company and its Subsidiaries taken as a
         whole, or Motorola or any of the  Motorola Domestic Subsidiaries, in
         any court of competent jurisdiction, seeking (i) its reorganization,
         liquidation, dissolution, arrangement or winding-up, or the
         composition or readjustment of its debts, (ii) the appointment of a
         receiver, custodian, trustee, examiner, liquidator or the like of the
         Company or such Subsidiary, or Motorola or such Motorola Domestic
         Subsidiary, as the case may be, or of all or any substantial part of
         its Property or (iii) similar relief in respect of the Company or such
         Subsidiary, or Motorola or such Motorola Domestic Subsidiary, as the
         case may be, under any law relating to bankruptcy, insolvency,
         reorganization, winding-up, or composition or adjustment of debts, and
         such proceeding or case shall continue undismissed, or an order,
         judgment or decree approving or ordering any of the foregoing shall be
         entered and continue unstayed and in effect, for a period of 60 or
         more days; or an order for relief against the Company or such
         Subsidiary, or Motorola or such Motorola Domestic Subsidiary, as the
         case may be, shall be entered in an involuntary case under the U.S.
         Bankruptcy Code; or

                 (i)  Any representation, warranty or certification made or
         deemed made by Motorola in the Motorola Guarantee Agreement (or in any
         modification or supplement thereto) or herein, or in any certificate
         furnished to any Lender or any Agent pursuant to the provisions of the
         Motorola Guarantee Agreement or Section 6.01(e) or 6.02 hereof, shall
         prove to have been false or misleading as of the time made or
         furnished in any material respect; or

                 (j)  Motorola shall default in the performance of any of its
         obligations under any of Sections 2, 4.01(e), 4.04, 4.05 and 4.06 of
         the Motorola Guarantee Agreement; or Motorola shall default in the
         performance of any of its other obligations in the Motorola Guarantee
         Agreement and such default shall continue unremedied for a period of
         30 or more days after notice thereof to the Company and Motorola by
         the Administrative Agent or any Lender (through the Administrative
         Agent); or

                 (k)  Motorola or any of the Motorola Domestic Subsidiaries
         shall default in the payment when due (after the expiration of
         applicable grace periods) of any principal







                                Credit Agreement
<PAGE>   58
                                    - 54 -

         of or interest on any of its Indebtedness aggregating in amount at
         least equal to 3% of amount of total stockholders' equity for Motorola
         and its consolidated Subsidiaries (determined on a consolidated basis
         without duplication in accordance with generally accepted accounting
         principles) as at the last day of the most recently completed fiscal
         quarter of Motorola ("Motorola's Net Worth"); or any event specified
         in any note, agreement, indenture or other document evidencing or
         relating to any such Indebtedness shall occur if the effect of such
         event is to cause, or (with the giving of any notice or the lapse of
         time or both) to permit the holder or holders of such Indebtedness (or
         a trustee or agent on behalf of such holder or holders) to cause, such
         Indebtedness to become due, or to be prepaid in full (whether by
         redemption, purchase, offer to purchase or otherwise), prior to its
         stated maturity or to have the interest rate thereon reset to a level
         so that securities evidencing such Indebtedness trade at a level
         specified in relation to the par value thereof; or

                 (l)  A final judgment or judgments for the payment of money in
         excess of 3% of Motorola's Net Worth (exclusive of judgment amounts
         fully covered by insurance where the insurer has admitted liability in
         respect of such judgment) shall be rendered by one or more courts,
         administrative tribunals or other bodies having jurisdiction against
         the Motorola or any of the Motorola Domestic Subsidiaries and the same
         shall not be discharged (or provision shall not be made for such
         discharge), or a stay of execution thereof shall not be procured,
         within 60 days from the date of entry thereof and Motorola or the
         relevant Motorola Domestic Subsidiary shall not, within said period of
         60 days, or such longer period during which execution of the same
         shall have been stayed, appeal therefrom and cause the execution
         thereof to be stayed during such appeal; or

                 (m)  Except for expiration in accordance with its terms, the
         Motorola Guarantee Agreement shall for whatever reason be terminated
         or cease to be in full force and effect, or the enforceability thereof
         shall be contested by Motorola; or

                 (n)  Motorola shall cease to own, free and clear of all Liens,
         directly or indirectly, at least (i) 20% of the aggregate voting
         equity interests of the Company, assuming full exercise of any
         warrants or full conversion of any convertible securities issued to
         Motorola or any of its Subsidiaries (whether or not currently
         exercisable or







                                Credit Agreement
<PAGE>   59
                                    - 55 -

         convertible) but before giving effect to any dilutive effect of any
         public offering of stock or other equity interests or (ii) 15% of the
         aggregate voting equity interests of the Company;

THEREUPON:  (1) in the case of an Event of Default other than one referred to
in clause (g) or (h) of this Section 9 with respect to the Company, the
Administrative Agent may and, upon request of the Majority Lenders, will, by
notice to the Company, terminate the Commitments and/or declare the principal
amount then outstanding of, and the accrued interest on, the Loans and all
other amounts payable by the Company hereunder and under the Revolving Credit
Notes (including, without limitation, any amounts payable under Section 5.05
hereof) to be forthwith due and payable, whereupon such amounts shall be
immediately due and payable without presentment, demand, protest or other
formalities of any kind, all of which are hereby expressly waived by the
Company; and (2) in the case of the occurrence of an Event of Default referred
to in clause (g) or (h) of this Section 9 with respect to the Company, the
Commitments shall automatically be terminated and the principal amount then
outstanding of, and the accrued interest on, the Loans and all other amounts
payable by the Company hereunder and under the Revolving Credit Notes
(including, without limitation, any amounts payable under Section 5.05 hereof)
shall automatically become immediately due and payable without presentment,
demand, protest or other formalities of any kind, all of which are hereby
expressly waived by the Company; provided that (x) any acceleration under
clause (1) of this Section 9 shall not become effective until three Business
Days after receipt of notice thereof by each of the Company and Motorola (and
such notice shall be deemed rescinded if, prior to such third Business Day, any
amount then due and owing hereunder (other than as a result of such
acceleration) shall be paid in full and all other Events of Default then
existing shall have been cured) and (y) upon payment by Motorola of the
Guaranteed Obligations under, and as defined in, the Motorola Guarantee
Agreement (subject to Section 2.09 thereof), the Commitments then in effect
shall automatically terminate.

                 Section 10.  The Agents.

                 10.01  Appointment, Powers and Immunities.  Each Lender hereby
appoints and authorizes each Agent to act as its agent hereunder and under the
other Credit Documents with such powers as are specifically delegated to such
Agent by the terms of this Agreement and of the other Credit Documents,
together with such







                                Credit Agreement
<PAGE>   60
                                    - 56 -

other powers as are reasonably incidental thereto.  Neither Agent (which term
as used in this sentence and in Section 10.05 and the first sentence of Section
10.06 hereof shall include reference to its affiliates and its own and its
affiliates' officers, directors, employees and agents):

                 (a)  shall have any duties or responsibilities except those
         expressly set forth in this Agreement and in the other Credit
         Documents, or shall by reason of this Agreement or any other Credit
         Document be a trustee for any Lender;

                 (b)  shall be responsible to the Lenders for any recitals,
         statements, representations or warranties contained in this Agreement
         or in any other Credit Document, or in any certificate or other
         document referred to or provided for in, or received by any of them
         under, this Agreement or any other Credit Document, or for the value,
         validity, effectiveness, genuineness, enforceability or sufficiency of
         this Agreement or any other Credit Document or any other document
         referred to or provided for herein or therein or for any failure by
         the Company or any other Person to perform any of its obligations
         hereunder or thereunder;

                 (c)  shall be required to initiate or conduct any litigation
         or collection proceedings hereunder or under any other Credit
         Document; or

                 (d)  shall be responsible for any action taken or omitted to
         be taken by it hereunder or under any other Credit Document or under
         any other document or instrument referred to or provided for herein or
         therein or in connection herewith or therewith, except for its own
         gross negligence or willful misconduct.

Each Agent may employ agents and attorneys-in-fact and shall not be responsible
for the negligence or misconduct of any such agents or attorneys-in-fact
selected by it in good faith.  The Administrative Agent may deem and treat the
payee of a Revolving Credit Note as the holder thereof for all purposes hereof
unless and until a notice of the assignment or transfer thereof shall have been
filed with such Administrative Agent, together with the consent of the Company
to such assignment or transfer (to the extent required by Section 11.06(b)
hereof).
                 10.02  Reliance by the Agents.  Each Agent shall be entitled
to rely upon any certification, notice or other communication (including,
without limitation, any thereof by







                                Credit Agreement
<PAGE>   61
                                    - 57 -

telephone, telecopy, telegram or cable) reasonably believed by it to be genuine
and correct and to have been signed or sent by or on behalf of the proper
Person or Persons, and upon advice and statements of legal counsel, independent
accountants and other experts selected by such Agent.  As to any matters not
expressly provided for by this Agreement or any other Credit Document, each
Agent shall in all cases be fully protected in acting, or in refraining from
acting, hereunder or thereunder in accordance with instructions given by the
Majority Lenders, and such instructions of the Majority Lenders and any action
taken or failure to act pursuant thereto shall be binding on all of the
Lenders.

                 10.03  Defaults.  Neither Agent shall be deemed to have
knowledge or notice of the occurrence of a Default unless such Agent has
received notice from a Lender, the Company or Motorola specifying such Default
and stating that such notice is a "Notice of Default".  In the event that the
Administrative Agent receives such a notice of the occurrence of a Default, the
Administrative Agent shall give prompt notice thereof to the Lenders.  The
Administrative Agent shall (subject to Section 10.07 hereof) take such action
with respect to such Default as shall be directed by the Majority Lenders,
provided that, unless and until the Administrative Agent shall have received
such directions, the Administrative Agent may (but shall not be obligated to)
take such action, or refrain from taking such action, with respect to such
Default as it shall deem advisable in the best interest of the Lenders except
to the extent that this Agreement expressly requires that such action be taken,
or not be taken, only with the consent or upon the authorization of the
Majority Lenders or all of the Lenders.

                 10.04  Rights as a Lender.  With respect to its Commitment and
the Loans made by it, each of Chase and Barclays (and any successor acting as
Administrative Agent or Documentation Agent, as the case may be) in its
capacity as a Lender hereunder shall have the same rights and powers hereunder
as any other Lender (if it shall be a Lender hereunder) and may exercise the
same as though it were not acting as the Administrative Agent or Documentation
Agent, as the case may be, and the term "Lender" or "Lenders" shall, unless the
context otherwise indicates, include the Administrative Agent or the
Documentation Agent, as the case may be, in its individual capacity.  Each of
Chase and Barclays (and any successor acting as Administrative Agent or
Documentation Agent, as the case may be) and its affiliates may (without having
to account therefor to any Lender) accept deposits from, lend money to, make
investments in and generally engage in any kind of banking, trust or other







                                Credit Agreement
<PAGE>   62
                                    - 58 -

business with the Company (and any of its Subsidiaries or Affiliates) as if it
were not acting as the Administrative Agent or the Documentation Agent, as the
case may be, and each of Chase and Barclays (and any such successor) and its
affiliates may accept fees and other consideration from the Company (and any of
its Subsidiaries or Affiliates) for services in connection with this Agreement
or otherwise without having to account for the same to the other Agent or the
Lenders.

                 10.05  Indemnification.  The Lenders agree to indemnify each
Agent (to the extent not reimbursed under Section 11.03 hereof, but without
limiting the obligations of the Company under said Section 11.03) ratably in
accordance with the aggregate principal amount of the Loans held by the Lenders
(or, if no Loans are at the time outstanding, ratably in accordance with their
respective Commitments) for any and all liabilities, obligations, losses,
damages, penalties, actions, judgments, suits, costs, expenses or disbursements
of any kind and nature whatsoever that may be imposed on, incurred by or
asserted against such Agent (including by any Lender) arising out of or by
reason of any investigation in or in any way relating to or arising out of this
Agreement or any other Credit Document or any other documents contemplated by
or referred to herein or therein or the transactions contemplated hereby or
thereby (including, without limitation, the costs and expenses that the Company
is obligated to pay under Section 11.03 hereof, but excluding, unless a Default
has occurred and is continuing, normal administrative costs and expenses
incident to the performance of its agency duties hereunder) or the enforcement
of any of the terms hereof or thereof or of any such other documents, provided
that no Lender shall be liable for any of the foregoing to the extent they
arise from the gross negligence or willful misconduct of the party to be
indemnified.

                 10.06  Non-Reliance on the Agents and Other Lenders.  Each
Lender agrees that it has, independently and without reliance on the Agents or
any other Lender, and based on such documents and information as it has deemed
appropriate, made its own credit analysis of the Company and Motorola and
decision to enter into this Agreement and that it will, independently and
without reliance upon the Agents or any other Lender, and based on such
documents and information as it shall deem appropriate at the time, continue to
make its own analysis and decisions in taking or not taking action under this
Agreement or under any other Credit Document.  Neither Agent shall be required
to keep itself informed as to the performance or observance by either Credit
Party of this Agreement or any of the other Credit Documents or any other
document referred to or provided for







                                Credit Agreement
<PAGE>   63
                                    - 59 -



herein or therein or to inspect the Properties or books of the Company or
Motorola.  Except for notices, reports and other documents and information
expressly required to be furnished to the Lenders by the Agents hereunder or
under any of the other Credit Documents, neither Agent shall have any duty or
responsibility to provide any Lender with any credit or other information
concerning the affairs, financial condition or business of the Company or
Motorola (or any of their respective Subsidiaries or affiliates) that may come
into the possession of such Agent or any of its affiliates.

                 10.07  Failure to Act.  Except for action expressly required
of the Agents hereunder and under the other Credit Documents, each Agent shall
in all cases be fully justified in failing or refusing to act hereunder and
thereunder unless it shall receive further assurances to its satisfaction from
the Lenders of their indemnification obligations under Section 10.05 hereof
against any and all liability and expense that may be incurred by it by reason
of taking or continuing to take any such action.

                 10.08  Resignation or Removal of the Agents.  Subject to the
appointment and acceptance of a successor Agent as provided below, any Agent
may resign at any time by giving notice thereof to the other Agent, the Lenders
and the Company, and any Agent may be removed at any time with or without cause
by the Majority Lenders.  Upon any such resignation or removal, the Majority
Lenders shall have the right to appoint a successor Agent with the prior
consent of the Company (which consent shall not be unreasonably withheld or
delayed).  If no successor Agent shall have been so appointed by the Majority
Lenders and shall have accepted such appointment within 30 days after the
retiring Agent's giving of notice of resignation or the Majority Lenders'
removal of the retiring Agent, then the retiring Agent may, on behalf of the
Lenders, appoint a successor Agent, that shall be a bank that has an office in
New York, New York with a combined capital and surplus of at least
$500,000,000.  Upon the acceptance of any appointment as an Agent hereunder by
a successor Agent, such successor Agent shall thereupon succeed to and become
vested with all the rights, powers, privileges and duties of the retiring
Agent, and the retiring Agent shall be discharged from its duties and
obligations hereunder.  After any retiring Agent's resignation or removal
hereunder as Agent, the provisions of this Section 10 shall continue in effect
for the benefit of such Agent in respect of any actions taken or omitted to be
taken by it while it was acting as an Agent.







                                Credit Agreement
<PAGE>   64
                                    - 60 -

                 10.09  Consents under Other Credit Documents.  Except as
otherwise provided in Section 11.04 hereof with respect to this Agreement, the
Administrative Agent may, with the prior consent of the Majority Lenders (but
not otherwise), consent to any modification, supplement or waiver under the
Motorola Guarantee Agreement, provided that, without the prior consent of all
of the Lenders, the Administrative Agent shall not (a) amend any of Sections 2,
5.03 and 5.04 thereof or (b) release Motorola from any of its obligations under
said Section 2 or 5.03 or otherwise agree to terminate the Motorola Guarantee
Agreement (except as expressly contemplated by the terms thereof).


                 Section 11.  Miscellaneous.

                 11.01  Waiver.  No failure on the part of any Agent or any
Lender to exercise and no delay in exercising, and no course of dealing with
respect to, any right, power or privilege under this Agreement or any Revolving
Credit Note shall operate as a waiver thereof, nor shall any single or partial
exercise of any right, power or privilege under this Agreement or any Revolving
Credit Note preclude any other or further exercise thereof or the exercise of
any other right, power or privilege.  The remedies provided herein are
cumulative and not exclusive of any remedies provided by law.

                 11.02  Notices.  All notices, requests and other
communications provided for herein (including, without limitation, any
modifications of, or waivers, requests or consents under, this Agreement) shall
be given or made in writing (including, without limitation, by telecopy)
delivered to the intended recipient at the "Address for Notices" specified
below its name on the signature pages hereof or on Schedule II hereto; or, as
to any party, at such other address as shall be designated by such party in a
notice to each other party.  Except as otherwise provided in this Agreement,
all such communications shall be deemed to have been duly given when
transmitted by telecopier or personally delivered or, in the case of a mailed
notice, upon receipt, in each case given or addressed as aforesaid.

                 11.03  Expenses, Etc.  The Company agrees to pay or reimburse
each of the Global Arrangers, the Agents and the Lenders for: (a) all
reasonable out-of-pocket costs and expenses of the Global Arrangers and the
Agents (including, without limitation, the reasonable fees and expenses of
Milbank, Tweed, Hadley & McCloy, special New York counsel to the Global
Arrangers, but not including any fees or expenses for any other







                                Credit Agreement
<PAGE>   65
                                    - 61 -

counsel to the Global Arrangers, the Agents or the Lenders) in connection with
(i) the negotiation, preparation, execution and delivery of this Agreement and
the other Credit Documents and the making of the Loans hereunder and (ii) the
negotiation or preparation of any modification, supplement or waiver of any of
the terms of this Agreement or any of the other Credit Documents (whether or
not consummated); (b) all reasonable out-of-pocket costs and expenses of the
Lenders and the Agents (including, without limitation, the reasonable fees and
expenses of legal counsel) in connection with (i) any Default and any
enforcement or collection proceedings resulting therefrom, including, without
limitation, all manner of participation in or other involvement with (x)
bankruptcy, insolvency, receivership, foreclosure, winding up or liquidation
proceedings, (y) judicial or regulatory proceedings and (z) workout,
restructuring or other negotiations or proceedings (whether or not the workout,
restructuring or transaction contemplated thereby is consummated) and (ii) the
enforcement of this Section 11.03; and (c) all transfer, stamp, documentary or
other similar taxes, assessments or charges levied by any Governmental
Authority in respect of this Agreement or any of the other Credit Documents or
any other document referred to herein or therein.

                 The Company hereby agrees to indemnify each Global Arranger,
each Agent and each Lender and their respective directors, officers, employees,
attorneys and agents from, and hold each of them harmless against, any and all
losses, liabilities, claims, damages or expenses incurred by any of them
(including, without limitation, any and all losses, liabilities, claims,
damages or expenses incurred by any Agent to any Lender), whether or not any
Agent or any Lender is a party thereto, arising out of or by reason of any
investigation or litigation or other proceedings (including any threatened
investigation or litigation or other proceedings) relating to the Loans
hereunder or any actual or proposed use by the Company or any of its
Subsidiaries of the proceeds of any of the Loans hereunder, including, without
limitation, the reasonable fees and disbursements of counsel incurred in
connection with any such investigation or litigation or other proceedings (but
excluding any such losses, liabilities, claims, damages or expenses incurred by
reason of the gross negligence or willful misconduct of the Person to be
indemnified).

                 11.04  Amendments, Etc.  Except as otherwise expressly
provided in this Agreement, any provision of this Agreement may be modified or
supplemented only by an instrument in writing signed by the Company, Motorola
and the Majority Lenders, or by the Company, Motorola and the Administrative
Agent acting with






                                Credit Agreement
<PAGE>   66
                                    - 62 -

the consent of the Majority Lenders, and any provision of this Agreement may be
waived by the Majority Lenders or by the Administrative Agent acting with the
consent of the Majority Lenders; provided that:  (a) no modification,
supplement or waiver shall, unless by an instrument signed by all of the
Lenders or by the Administrative Agent acting with the consent of all of the
Lenders:  (i) increase, or extend the term of the Commitments, or extend the
time or waive any requirement for the reduction or termination of the
Commitments, (ii) extend the date fixed for the payment of principal of or
interest on any Loan or any fee hereunder, (iii) reduce the amount of any such
payment of principal, (iv) reduce the rate at which interest is payable thereon
or any fee is payable hereunder, (v) alter the rights or obligations of the
Company to prepay Loans, (vi) alter the manner in which payments or prepayments
of principal, interest or other amounts hereunder shall be applied as between
the Lenders or Types of Loans, (vii) alter the terms of Section 10.09 hereof or
this Section 11.04, (viii) modify the definition of the term "Majority Lenders"
or modify in any other manner the number or percentage of the Lenders required
to make any determinations or waive any rights hereunder or to modify any
provision hereof or (ix) waive any of the conditions precedent set forth in
Section 6.01 hereof; and (b) any modification or supplement of Section 10
hereof, or of any of the rights or duties of any Agent hereunder, shall require
the consent of such Agent.  Notwithstanding the foregoing, the Lenders and the
other Agent hereby authorize the Administrative Agent to enter into, on behalf
of the Lenders and the Agents, the amendments contemplated by Section 8.05
hereof and Section 4.07(a) of the Motorola Guarantee Agreement without further
consent of the Lenders.

                 11.05  Successors and Assigns.  This Agreement shall be
binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns.

                 11.06  Assignments and Participations.

                 (a)  Except in connection with the transfer of assets
permitted under Section 8.05 hereof, the Company may not assign any of its
rights or obligations hereunder or under the Revolving Credit Notes without the
prior consent of all of the Lenders and the Agents.

                 (b)  Each Lender may assign any of its Loans, its Revolving
Credit Note, and its Commitment (but only with the consent of the Company and
the Administrative Agent, which consent in each case shall not be unreasonably
withheld or delayed); provided that







                                Credit Agreement
<PAGE>   67
                                    - 63 -

                 (i)  no such consent by the Company or the Administrative
         Agent shall be required in the case of any assignment to another
         Lender or to an affiliate of the assigning Lender;

                 (ii) except to the extent the Company and the Administrative
         Agent shall otherwise consent, any such partial assignment (other than
         to another Lender) shall be in an amount at least equal to $10,000,000
         and, after giving effect to such assignment, such assigning Lender
         shall hold a Commitment in an amount at least equal to $10,000,000;

                 (iii) each such assignment by a Lender of its Loans,
         Revolving Credit Note or Commitment shall be made in such manner so
         that the same portion of its Loans, Revolving Credit Note and
         Commitment is assigned to the respective assignee; and

                 (iv)  in order to evidence each such assignment, the assignor
         and assignee shall execute and deliver an Assignment and Acceptance.

Upon execution and delivery by the assignor and the assignee of such Assignment
and Acceptance (and the delivery thereof to the Administrative Agent (with a
copy to the Company) for recordation of the assignment provided therein), and
upon consent thereto by the Company and the Administrative Agent to the extent
required above, the assignee shall have, to the extent of such assignment
(unless otherwise consented to by the Company and the Administrative Agent),
the obligations, rights and benefits of a Lender hereunder holding the
Commitment and Loans (or portions thereof) assigned to it and specified in such
Assignment and Acceptance (in addition to the Commitment and Loans, if any,
theretofore held by such assignee) and the assigning Lender shall, to the
extent of such assignment, be released from the Commitment (or portion thereof)
so assigned.  Upon each such assignment the assigning Lender shall pay the
Administrative Agent an assignment fee of $3,000.

                 (c)  A Lender may sell or agree to sell to one or more other
Persons (each a "Participant") a participation in all or any part of any Loans
held by it, or in its Commitment, provided that such Participant shall not have
any rights or obligations under this Agreement or any Revolving Credit Note or
any other Credit Document (the Participant's rights against such Lender in
respect of such participation to be those set forth in the agreements executed
by such Lender in favor of the Participant).  All amounts payable by the
Company to any Lender under Section 5





                               Credit Agreement

<PAGE>   68
                                    - 64 -


hereof in respect of Loans held by it, and its Commitment, shall be determined
as if such Lender had not sold or agreed to sell any participations in such
Loans and Commitment, and as if such Lender were funding each of such Loans and
Commitment in the same way that it is funding the portion of such Loan and
Commitment in which no participations have been sold.  In no event shall a
Lender that sells a participation agree with the Participant to take or refrain
from taking any action hereunder or under any other Credit Document except that
such Lender may agree with the Participant that it will not, without the
consent of the Participant, agree to (i) increase or extend the term of such
Lender's Commitment, (ii) extend the date fixed for the payment of principal of
or interest on the related Loan or Loans or any portion of any fee hereunder
payable to the Participant, (iii) reduce the amount of any such payment of
principal, (iv) reduce the rate at which interest is payable thereon, or any
fee hereunder payable to the Participant, to a level below the rate at which
the Participant is entitled to receive such interest or fee or (v) consent to
any modification, supplement or waiver hereof or of any of the other Credit
Documents to the extent that the same, under Section 10.09 or 11.04 hereof,
requires the consent of each Lender.

                 (d)  In addition to the assignments and participations
permitted under the foregoing provisions of this Section 11.06, any Lender may
(without notice to the Company, any Agent or any other Lender and without
payment of any fee) assign and pledge all or any portion of its Loans and its
Revolving Credit Note to any Federal Reserve Bank as collateral security
pursuant to Regulation A and any Operating Circular issued by such Federal
Reserve Bank. No such assignment shall release the assigning Lender from its
obligations hereunder.

                 (e)  A Lender may furnish any information concerning the
Company or Motorola (or any of their respective Subsidiaries and affiliates) or
the Project in the possession of such Lender from time to time to assignees and
Participants (including prospective assignees and Participants), subject,
however, to the provisions of Section 11.12(b) hereof.

                 (f)  Anything in this Section 11.06 to the contrary
notwithstanding, no Lender may assign or participate any interest in any Loan
held by it hereunder to the Company or Motorola (or any of their respective
Subsidiaries or affiliates) without the prior consent of each Lender.

                 11.07  Survival.  The obligations of the Company under
Sections 5.01, 5.05, 5.06 and 11.03 hereof, and the obligations







                                Credit Agreement
<PAGE>   69
                                    - 65 -


of the Lenders under Section 10.05 hereof, shall survive the repayment of the
Loans and the termination of the Commitments and, in the case of any Lender
that may assign any interest in its Commitment or Loans hereunder, shall
survive the making of such assignment with respect to matters occurring prior
to such assignment, notwithstanding that such assigning Lender may cease to be
a "Lender" hereunder.  In addition, each representation and warranty made, or
deemed to be made by a notice of any Loan, herein or pursuant hereto shall
survive the making of such representation and warranty, and no Lender shall be
deemed to have waived, by reason of making any Loan, any Default that may arise
by reason of such representation or warranty proving to have been false or
misleading, notwithstanding that such Lender or any Agent may have had notice
or knowledge or reason to believe that such representation or warranty was
false or misleading at the time such Loan was made.

                 11.08  Captions.  The table of contents and captions and
section headings appearing herein are included solely for convenience of
reference and are not intended to affect the interpretation of any provision of
this Agreement.

                 11.09  Counterparts.  This Agreement may be executed in any
number of counterparts, all of which taken together shall constitute one and
the same instrument and any of the parties hereto may execute this Agreement by
signing any such counterpart.

                 11.10  Governing Law; Submission to Jurisdiction.  This
Agreement and the Revolving Credit Notes shall be governed by, and construed in
accordance with, the law of the State of New York.  The Company hereby submits
to the nonexclusive jurisdiction of the United States District Court for the
Southern District of New York and of the Supreme Court of the State of New York
sitting in New York County (including its Appellate Division), and of any other
appellate court in the State of New York, for the purposes of all legal
proceedings arising out of or relating to this Agreement or the transactions
contemplated hereby.  The Company hereby irrevocably waives, to the fullest
extent permitted by applicable law, any objection that it may now or hereafter
have to the laying of the venue of any such proceeding brought in such a court
and any claim that any such proceeding brought in such a court has been brought
in an inconvenient forum.

                 11.11  Waiver of Jury Trial.  EACH OF THE COMPANY, THE AGENTS,
THE GLOBAL ARRANGERS AND THE LENDERS HEREBY IRREVOCABLY







                                Credit Agreement
<PAGE>   70
                                    - 66 -

WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO
TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS
AGREEMENT, THE REVOLVING CREDIT NOTES OR THE TRANSACTIONS CONTEMPLATED HEREBY.

                 11.12  Treatment of Certain Information; Confidentiality.

                 (a)  The Company acknowledges that from time to time financial
advisory, investment banking and other services may be offered or provided to
the Company or one or more of its Subsidiaries (in connection with this
Agreement or otherwise) by any Lender or by one or more subsidiaries or
affiliates of such Lender.  The Company hereby agrees that, in the event any
such services are provided to the Company or any of its Subsidiaries, each
Lender providing such services is authorized to share any information delivered
to such Lender by the Company and its Subsidiaries pursuant to this Agreement,
or in connection with the decision of such Lender to enter into this Agreement,
to any such subsidiary or affiliate providing such services, provided that any
such subsidiary or affiliate receiving such information agrees to be bound by
the provisions of paragraph (b) below as if it were a Lender hereunder.  Such
authorization shall survive the repayment of the Loans and the termination of
the Commitments.

                 (b)  Each Lender, each Agent and each Global Arranger agrees
(on behalf of itself and each of its affiliates, directors, officers, employees
and representatives) to restrict dissemination of any Confidential Information
(as defined below) only to those of its directors, officers, employees and
representatives who are involved in the evaluation of such information, and to
use reasonable precautions to keep such information confidential, in accordance
with its customary procedures for handling confidential information of the same
nature and in accordance with safe and sound banking practices. For purposes of
this Agreement, "Confidential Information" shall mean any non-public
information supplied to it by the Company, including its contractors,
consultants or sponsors, pursuant to this Agreement or by Motorola pursuant to
the Motorola Guarantee Agreement, that is identified (in writing, in the case
of written information) by the Company or Motorola, as the case may be, as
being confidential at the time the same is delivered to the Lenders, the Agents
or the Global Arrangers, provided that nothing herein shall limit the
disclosure of any such information by any Lender, Agent or Global Arranger (i)
after such information shall have become public (other than through a violation
of this Section 11.12 by such Lender, Agent or Global







                                Credit Agreement
<PAGE>   71
                                    - 67 -


Arranger), (ii) to the extent required by statute, rule, regulation or judicial
process, (iii) to counsel or other experts for any of the Lenders, Agents or
Global Arrangers, provided that such counsel or experts shall be bound by the
requirements of this Section 11.12(b) with respect to any such information,
(iv) to bank examiners (or any other regulatory authority having jurisdiction
over any Lender, Agent or Global Arranger), or to auditors or accountants, (v)
to any Global Arranger, any Agent or any other Lender (or to any of their
respective affiliates, provided that any such disclosure to any such affiliate
shall be made on a "need to know" basis only for use by such affiliates (and
each of its officers, directors and employees) solely in connection with the
transactions contemplated by this Agreement and each such affiliate (and each
of its officers, directors and employees) shall agree (for the benefit of the
Company and Motorola) to be bound to keep such information confidential on the
same terms as set forth in this Section 11.12), (vi) in connection with any
litigation to which any one or more of the Lenders, the Global Arrangers or the
Agents is a party, or in connection with the enforcement of rights or remedies
hereunder or under any other Credit Document, provided that the party intending
to make such disclosure shall use reasonable efforts to cooperate with the
Company or with Motorola, as the case may be, to reasonably minimize the extent
of any such disclosure or to obtain confidential treatment of information to be
disclosed, (vii) to a subsidiary or affiliate of such Lender as provided in
paragraph (a) above or (viii) to any assignee or participant (or prospective
assignee or participant) so long as such assignee or participant (or
prospective assignee or participant) first executes and delivers to the
respective Lender, the Company and Motorola a Confidentiality Agreement
substantially in the form of Exhibit G hereto; provided, further, that in no
event shall any Lender, Agent or Global Arranger be obligated or required to
return any materials furnished by the Company or Motorola hereunder or under
the Motorola Guarantee Agreement, respectively, except to the extent it has
agreed to do so in writing in conjunction with the receipt of such information.
The obligations of any assignee that has executed a Confidentiality Agreement
in the form of Exhibit G hereto shall be superseded by this Section 11.12 on
the date upon which such assignee becomes a Lender hereunder pursuant to
Section 11.06(b) hereof.







                                Credit Agreement
<PAGE>   72
                                    - 68 -

                 IN WITNESS WHEREOF, the parties hereto have caused this Credit
Agreement to be duly executed and delivered as of the day and year first above
written.

                                  IRIDIUM LLC
                      
                      
                      
                                  By  /s/ PAUL DAVERIO
                                    -------------------------
                                    Name:  Paul Daverio
                                    Title: Chief Financial Officer
                      
                                  Address for Notices:
                      
                                  Iridium LLC
                                  1401 H Street, N.W.
                                  Washington, D.C.  20005
                      
                                  Attention:  Paul Daverio
                      
                                  Telecopier No.:  (202) 842-0006
                                  Telephone No.:   (202) 326-5710
                      
                      
                 
                 
                 
                 
                 
                                Credit Agreement                 
                 
<PAGE>   73
                                    - 69 -




                                          LENDERS
                                          -------
                                       
                                          THE CHASE MANHATTAN BANK
                                       
                                       
                                       
                                          By /s/ ANN B. KERNS
                                            -----------------------
                                            Name:  Ann B. Kerns
                                            Title: Vice President
                                       
                                       
                                          BARCLAYS BANK PLC
                                       
                                       
                                       
                                          By /s/ JOHN GIANONNE
                                            -----------------------
                                            Name:  John Gianonne
                                            Title: Director
                                       
                                       
                                          ABN AMRO BANK N.V.
                                       
                                       
                                       
                                          By /s/ JAMES J. JOHNSTON
                                            -----------------------
                                            Name:  James J. Johnston
                                            Title: Vice President
                                       
                                       
                                       
                                          By /s/ JOHN E. ROBERTSON
                                            -----------------------
                                            Name:  John E. Robertson
                                            Title: Vice President
                                       
                                       
                                          BANK OF AMERICA NT&SA
                                       
                                       
                                       
                                          By /s/ DOUG BONTEMPS
                                            -----------------------
                                            Name:  Doug Bontemps
                                            Title: Vice President
                                       
                                       





                                Credit Agreement                 

<PAGE>   74
                                    - 70 -




                                           BANK OF MONTREAL
                                
                                
                                
                                           By /s/ ALLEGRA GRIFFITHS
                                             -----------------------
                                             Name:  ALLEGRA GRIFFITHS
                                             Title: Director
                                
                                
                                           THE BANK OF NEW YORK
                                
                                
                                
                                           By /s/ JAMES W. WHITAKER
                                             -----------------------
                                             Name:  James W. Whitaker
                                             Title: Vice President
                                
                                
                                           THE BANK OF NOVA SCOTIA
                                
                                
                                
                                           By /s/ F.C.H. ASHBY
                                             -----------------------
                                             Name:  F.C.H. ASHBY
                                             Title: Senior Manager-
                                                    Loan Operations
                                
                                
                                           THE BANK OF TOKYO-MITSUBISHI,
                                             LTD., CHICAGO BRANCH
                                
                                
                                
                                           By /s/ TOKUTARO SEKINE
                                             -----------------------
                                             Name:  TOKUTARO SEKINE
                                             Title: General Manager
                                
                                
                                           BANQUE NATIONALE DE PARIS
                                
                                
                                
                                           By /s/ FREDRICK H. MORYL, JR.
                                             ---------------------------
                                             Name:  Fredrick H. Moryl, Jr.
                                             Title: Senior Vice President
                                
                                
                                
                                




                               Credit Agreement
<PAGE>   75
                                    - 71 -


                                        BAYERISCHE HYPOTHEKEN-UND
                                          WECHSEL-BANK
                                          AKTIENGESELLSCHAFT,
                                          NEW YORK BRANCH
                                
                                
                                
                                        By /s/ SUSANNE WITT
                                          -----------------------
                                          Name:  Susanne Witt
                                          Title: AVP
                                
                                
                                
                                        By /s/ DAVID ROCKWELL
                                          -----------------------
                                          Name:  David Rockwell
                                          Title: SVP
                                
                                
                                        CIBC INC.
                                
                                
                                
                                        By /s/ MARISA J. HARNEY
                                          -----------------------
                                          Name:  Marisa J. Harney
                                          Title: Director, CIBC Wood Gundy
                                                 Securities Corp acting as
                                                 Agent for CIBC, Inc.
                                
                                
                                        CITIBANK, N.A.
                                
                                
                                
                                        By /s/ JAMES M. WALSH
                                          -----------------------
                                          Name:  James M. Walsh
                                          Title: Attorney-in-fact
                                
                                
                                        CREDIT LYONNAIS
                                          CHICAGO BRANCH
                                
                                
                                
                                        By /s/ MICHEL BUYSSCHAERT
                                          -----------------------
                                          Name:  Michel Buysschaert
                                          Title: vice President
                                
                                
                                





                               Credit Agreement
<PAGE>   76
                                    -72 -


                            
                                CREDIT SUISSE
                            
                            
                            
                                By /s/ WILLIAM P. MURRAY
                                  -----------------------
                                  Name:  William P. Murray
                                  Title: Member of Senior 
                                          Management
                            
                            
                                By /s/ KRISTINN R. KRISTINSSON
                                  -----------------------------
                                  Name:  Kristinn R. Kristinsson
                                  Title: Associate
                            
                            
                                DEUTSCHE BANK, AG -
                                  CHICAGO BRANCH
                            
                            
                            
                                By /s/ HANS RODERICH
                                  -----------------------
                                  Name:  Hans Roderich
                                  Title: Associate
                            
                            
                                By /s/ VIRGINIA N. BROWN
                                  -----------------------
                                  Name:  Virginia N. Brown
                                  Title: Assistant Vice President
                            
                            
                                DRESDNER BANK AG, NEW YORK AND
                                  GRAND CAYMAN BRANCHES
                            
                            
                            
                                By /s/ LAWRENCE E. JONES
                                  -----------------------
                                  Name:  Lawrence E. Jones
                                  Title: Vice President
                            
                            
                            
                                By /s/ JUERGEN H. THIEME
                                  -----------------------
                                  Name:  Juergen H. Thieme
                                  Title: First Vice President
                            
                            


                   
                   
                   
                               Credit Agreement
                   
<PAGE>   77
                                    - 73 -



                                      THE FIRST NATIONAL BANK
                                        OF CHICAGO



                                      By /s/ DEBRA L. ROGGE
                                        -----------------------
                                        Name:  Debra L. Rogge
                                        Title: Authorized Agent


                                      THE INDUSTRIAL BANK OF JAPAN,
                                        LIMITED, NEW YORK BRANCH



                                      By /s/ JUN WATANABE
                                        -----------------------
                                        Name:  Jun Watanabe
                                        Title: Senior Vice President


                                      LTCB TRUST COMPANY



                                      By /s/ SATORU OTSUBO
                                        -----------------------
                                        Name:  Satoru Otsubo
                                        Title: Executive Vice President


                                      THE MITSUBISHI TRUST AND
                                        BANKING CORPORATION



                                      By /s/ PATRICIA LORET DE MOLA
                                        ---------------------------
                                        Name:  Patricia Loret de Mola
                                        Title: Senior Vice President


                                      NATIONSBANK OF TEXAS, N.A.



                                      By /s/ PAMELA S. KURTZMAN
                                        -----------------------
                                        Name:  Pamela S. Kurtzman
                                        Title: Vice President








                               Credit Agreement
<PAGE>   78
                                    - 74 -



                                        ROYAL BANK OF CANADA



                                        By /s/ CYNTHIA K. WONG
                                          -----------------------
                                          Name:  Cynthia K. Wong
                                          Title: Manager


                                        THE SANWA BANK, LIMITED
                                          NEW YORK BRANCH



                                        By /s/ LAURANCE J. BRESSLER
                                          -------------------------
                                          Name:  Laurance J. Bressler
                                          Title: Vice President & Area
                                                  Manager


                                        SOCIETE GENERALE



                                        By /s/ SETH F. ASOFSKY
                                          -----------------------
                                          Name:  Seth F. Asofsky
                                          Title: Vice President


                                        TORONTO-DOMINION (NEW YORK),
                                          INC.



                                        By /s/ M. BAWDZIERZ
                                          -----------------------
                                          Name:  M. BAWDZIERZ
                                          Title: Managing Director









                               Credit Agreement
<PAGE>   79
                                   - 75 -


 
                                 UNION BANK OF SWITZERLAND,
                                   NEW YORK BRANCH
 
 
 
                                 By /s/ RICHARD H. ENNIS
                                   -----------------------
                                   Name:  Richard H. Ennis
                                   Title: Vice President
 
 
 
                                 By /s/ DEBORAH MALDEN
                                   -----------------------
                                   Name:  Deborah Malden
                                   Title: Managing Director
 
 
                                 WESTDEUTSCHE LANDESBANK
                                   GIROZENTRALE,
                                   NEW YORK BRANCH
 
 
 
                                 By /s/ SALVATORE BATTINELLI
                                   -------------------------
                                   Name:  Salvatore Battinelli
                                   Title: Vice President-
                                          Credit Department
 
 
 
                                 By /s/ C. D. ROCKEY
                                   -----------------------
                                   Name:  C. D. Rockey
                                   Title: Associate
 
 
                                 THE ASAHI BANK, LTD.
 
 
 
                                 By /s/ JUNICHI YAMADA
                                   -----------------------
                                   Name:  Mr. Junichi Yamada
                                   Title: Senior Deputy General
                                           Manager
 
 






                               Credit Agreement
<PAGE>   80
                                   - 76 -

                        AUSTRALIA AND NEW ZEALAND
                          BANKING GROUP LIMITED



                        By /s/ IAN P. SANDERS
                          ---------------------
                          Name:  Ian P. Sanders
                          Title: Vice President


                        BANCA COMMERCIALE ITALIANA -
                          NEW YORK BRANCH



                        By /s/ SARAH KIM
                          ---------------------
                          Name:  Sarah Kim
                          Title: AVP


                        By /s/ BRIAN CARLSON
                          ---------------------
                          Name:  Brian Carlson
                          Title: AVP


                        BANCA CRT S.p.A.


                        By /s/ GIORGIO CUCCULO
                          ---------------------
                          Name:  Giorgio Cucculo
                          Title: Manager & EVP


                        By /s/ C. VINCENT CALVO
                          ---------------------
                          Name:  C. Vincent Calvo
                          Title: Vice President


                        BANCA MONTE DEI PASCHI DI
                                 SIENA SPA



                        By /s/ S.M. SONDAK      
                          ---------------------
                          Name:  S.M. Sondak     
                          Title: F.V.P. & Dep. General Manager


                        By /s/ BRIAN R. LANDY   
                          ---------------------
                          Name:  Brian R. Landy
                          Title: Vice President



                               Credit Agreement
<PAGE>   81
                                   - 77 -

                         BANCA NAZIONALE DEL LAVORO
                           S.p.A. - NEW YORK BRANCH



                         By /s/ CARLO VECCHI
                           ---------------------
                           Name:  Carlo Vecchi
                           Title: Senior Vice President


                         By /s/ MIGUEL J. MEDIDA
                           ---------------------
                           Name:  Miguel J. Medida
                           Title: Vice President



                         BANK AUSTRIA
                           AKTIENGESELLSCHAFT



                         By /s/ J. ANTHONY SEAY
                           ---------------------
                           Name:  J. Anthony Seay
                           Title: Vice President



                         By /s/ JONATHAN B. BAKKER
                           -----------------------
                           Name:  Jonathan B. Bakker
                           Title: Vice President


                         BANK OF IRELAND



                         By /s/ RANDOLPH M. ROSS
                           ---------------------
                           Name:  Randolph M. Ross
                           Title: Vice President




                               Credit Agreement
<PAGE>   82
                                   - 78 -

                                        BAYERISCHE LANDESBANK
                                          GIROZENTRALE
                                          CAYMAN ISLANDS BRANCH
                                        
                                        
                                        
                                        By /s/ BERT VON STUELPNAGEL
                                          ---------------------
                                          Name: Bert Von Stuelpnagel
                                          Title: Executive Vice President 
                                                 & Manager
                                        
                                        
                                        By /s/ PETER OBERMANN
                                          ---------------------
                                          Name: Peter Obermann
                                          Title: Manager Lending Division
                                        
                                        
                                        BHF-BANK AKTIENGESELLSCHAFT
                                        
                                        
                                        
                                        By /s/ ERIN CONTOS
                                          ---------------------
                                          Name: Erin Contos
                                          Title: VP
                                        
                                        
                                        
                                        By /s/ THOMAS J. SELFO
                                          ---------------------
                                          Name: Thomas J. Selfo
                                          Title: Assistant Vice President
                                        
                                        
                                        CAISSE NATIONALE DE CREDIT
                                          AGRICOLE (CNCA)
                                        
                                        
                                        
                                        By /s/ ALAIN BUTZBACH
                                          ---------------------
                                          Name: Alain Butzbach
                                          Title: Executive Vice President
                                                  Deputy General Manager




                               Credit Agreement
<PAGE>   83
                                   - 79 -

                                        COMMERZBANK AG
                                        
                                        
                                        
                                        By /s/ ANDREW JACOBYANSKY
                                          -------------------------
                                          Name: Andrew Jacobyansky
                                          Title: Vice President
                                        
                                        
                                        By /s/ CARYN COSENTINI
                                          -------------------------
                                          Name: Caryn Cosentini
                                          Title: Vice President
                                        
                                        
                                        COMPAGNIE FINANCIERE DE CIC
                                          ET DE L'UNION EUROPEENNE
                                        
                                        
                                        
                                        By /s/ A. CALO
                                          -------------------------
                                          Name: A. Calo
                                          Title: VP
                                        
                                        By /s/ MARTHA SKIDMORE
                                          -------------------------
                                          Name: Martha Skidmore
                                          Title: VP
                                        

                                        COOPERATIEVE CENTRALE
                                          RAIFFEISEN-BOERENLEENBANK
                                          B.A., "RABOBANK
                                          NEDERLAND", NEW YORK BRANCH
                                        
                                        
                                        
                                        By /s/ WILLIAM H. WELCH
                                          -------------------------
                                          Name: William H. Welch
                                          Title: Vice President & Manager
                                        

                                        By /s/ W. JEFFREY VOLLACK
                                          -------------------------
                                          Name: W. Jeffery Vollack
                                          Title: Vice President, Manager
                                        



                               Credit Agreement
<PAGE>   84
                                   - 80 -

                                        CREDIT LOCAL DE FRANCE,
                                          NEW YORK AGENCY
                                        
                                        
                                        
                                        By /s/ DAVID H. EISENDRATH
                                          ---------------------------
                                          Name: David H. Eisendrath
                                          Title: Deputy General Manager
                                        
                                        
                                        THE DAI-ICHI KANGYO BANK, LTD.
                                        
                                        
                                        
                                        By /s/ TAKESHI KURITA
                                          ---------------------------
                                          Name: Takeshi Kurita
                                          Title: Vice President
                                        
                                        
                                        EXPORT DEVELOPMENT CORPORATION
                                        
                                        
                                        
                                        By /s/ PETER FORAN
                                          ---------------------------
                                          Name: Peter Foran
                                          Title: Team Leader - 
                                                 Information Technologies

                                        By /s/ PETER HEPBURN
                                          ---------------------------
                                          Name: Peter Hepburn
                                          Title: Team Leader - 
                                                 Project Finance
                                        
                                        
                                        THE FIRST NATIONAL BANK
                                          OF BOSTON
                                        
                                        
                                        
                                        By /s/ SHEPARD D. RAINIE
                                          ---------------------------
                                          Name: Shepard D. Rainie
                                          Title: Director
                                        
                                        
                                        FLEET NATIONAL BANK
                                        
                                        
                                        
                                        By /s/ PAULA H. LANG
                                          ---------------------------
                                          Name: Paula H. Lang
                                          Title: SVP
                                        



                               Credit Agreement
<PAGE>   85
                                   - 81 -
                                        
                                        THE FUJI BANK, LIMITED
                                          CHICAGO BRANCH
                                        
                                        
                                        
                                        By /s/ HIDEKAZU SEO
                                          ---------------------------
                                          Name: Hidekazu Seo
                                          Title: Joint General Manager
                                        
                                        
                                        GULF INTERNATIONAL BANK B.S.C.
                                        
                                        
                                        
                                        
                                        By /s/ THOMAS E. FITZHERBERT
                                          ---------------------------
                                          Name: Thomas E. Fitzherbert
                                          Title: Vice President
                                        
                                        
                                        By /s/ ISSA N. BACONI
                                          ---------------------------
                                          Name: Issa N. Baconi
                                          Title: SVP & Branch Manager
                                        
                                        
                                        ISTITUTO BANCARIO SAN PAOLO
                                          DI TORINO S.P.A.
                                        
                                        
                                        
                                        By /s/ WILLIAM J. DE ANGELO
                                          ---------------------------
                                          Name: William J. De Angelo
                                          Title: First Vice President
                                        
                                        
                                        KB FINANCIAL SERVICES (IRELAND)
                                        
                                        
                                        
                                        By /s/ CORMAC O ROURKE
                                          ---------------------------
                                          Name: Cormac O Rourke
                                          Title: General Manager
                                        
                                        By /s/ BRIAN DUNNE
                                          ---------------------------
                                          Name: Brian Dunne
                                          Title: Associate Director
                                        
                                        



                               Credit Agreement
<PAGE>   86
                                   - 82 -

                                        LANDESBANK HESSEN-THURINGEN
                                          GIROZENTRALE
                                        
                                        
                                        
                                        By /s/ JOHN A. GREGORY
                                          ----------------------------
                                          Name: John A. Gregory
                                          Title: Vice President-
                                                  Structured Finance
                                        
                                        
                                        
                                        By /s/ SYLVIA MORVAN
                                          ----------------------------
                                          Name: Sylvia Morvan
                                          Title: Assistant Vice President-
                                                  Structured Finance

                                        
                                        MERITA BANK LTD-
                                          NEW YORK BRANCH
                                        
                                        
                                        
                                        By /s/ CHARLES J. LANSDOWN
                                          ----------------------------
                                          Name: Charles J. Lansdown
                                          Title: Vice President
                                        
                                        
                                        By /s/ ERIC I. MANN
                                          ----------------------------
                                          Name: Eric I. Mann
                                          Title: Vice President
                                        
                                        
                                        THE MITSUI TRUST AND BANKING
                                          COMPANY, LIMITED
                                        
                                        
                                        
                                        By /s/ SHIGERU TSUJIMOTO
                                          ----------------------------
                                          Name: Shigeru Tsujimoto
                                          Title: Senior Vice President
                                                   & Manager
                                        
                                        
                                        THE NIPPON CREDIT BANK, LTD.
                                        
                                        
                                        
                                        By /s/ PETER CAPITELLI
                                          ----------------------------
                                          Name: Peter Capitelli
                                          Title: Vice President & Manager





                               Credit Agreement
<PAGE>   87
                                   - 83 -

                                    THE NORTHERN TRUST COMPANY
                                
                                
                                
                                    By /s/ SIDNEY R. DILLARD
                                      ----------------------------
                                      Name: Sidney R. Dillard
                                      Title: Vice President
                                
                                
                                    PNC BANK, NATIONAL ASSOCIATION
                                
                                
                                
                                    By /s/ TOM PARTRIDGE
                                      ----------------------------
                                      Name: Tom Partridge
                                      Title: Assistant Vice President
                                
                                
                                    THE SAKURA BANK, LIMITED
                                
                                
                                
                                    By /s/ TAMIHIRO KAWAUCHI
                                      ----------------------------
                                      Name: Tamihiro Kawauchi
                                      Title: Senior Vice President &
                                               Head of Real Estate/
                                               Project Finance Dept.
                                
                                
                                    THE SUMITOMO TRUST &
                                      BANKING CO., LTD.,
                                      NEW YORK BRANCH
                                
                                
                                
                                    By /s/ SURAJ P. BHATIA
                                      ----------------------------
                                      Name: Suraj P. Bhatia
                                      Title: Senior Vice President
                                               Manager, Corporate
                                               Finance Dept.
                                
                                
                                
                                



                               Credit Agreement
<PAGE>   88
                                   - 84 -


                           SWISS BANK CORPORATION,
                             NEW YORK BRANCH
                        
                        
                        
                           By /s/ THOMAS R. SALZANO
                             --------------------------
                             Name: Thomas R. Salzano
                             Title: Associate Director
                                      Banking Finance Support
                        
                        
                        
                           By /s/ SABINA WU
                             --------------------------
                             Name: Sabina Wu
                             Title: Director, 
                                      Credit Risk Management
                        
                        
                           THE TOKAI BANK, LIMITED
                        
                        
                        
                           By /s/ DENNIS C. LONGWELL
                             --------------------------
                             Name: Dennis C. Longwell
                             Title: Executive Vice President
                        
                        
                           UNION BANK OF CALIFORNIA, N.A.
                        
                        
                           By /s/ B. ADAM TROUT
                             --------------------------
                             Name: B. Adam Trout
                             Title: Assistant Vice President
                        
                        
                           YASUDA TRUST & BANKING CO.,
                             LTD.
                        
                        
                        
                           By /s/ NORIO MIYASHITA
                             --------------------------
                             Name: Norio Miyashita
                             Title: Vice President
                        
                        
                        



                               Credit Agreement
<PAGE>   89
                                   - 85 -

                                     GLOBAL ARRANGERS
                                     ----------------
                                     
                                     CHASE SECURITIES INC.,
                                       as a Global Arranger
                                     
                                     
                                     By /s/ THOMAS CASSIN
                                       ---------------------
                                       Title: Vice President
                                     
                                     
                                     BZW, a division of
                                       BARCLAYS BANK PLC,
                                       as a Global Arranger
                                     
                                     
                                     By /s/ JOHN GIANONNE
                                       ---------------------
                                       Title: Director
                                     





                               Credit Agreement
<PAGE>   90
                                   - 86 -


                                      ADMINISTRATIVE AGENT
                                      --------------------
                                      
                                      THE CHASE MANHATTAN BANK
                                      
                                      
                                      By /s/ ANN B. KEARNS
                                        ---------------------
                                        Title: Vice President
                                      
                                      
                                      Address for Notices:
                                      
                                      The Chase Manhattan Bank
                                      Agent Bank Services Group
                                      140 East 45th Street, 29th Floor
                                      New York, New York  10017
                                      Attention:  Sandra Miklave
                                      
                                      Telecopier No.:  (212) 622-0122
                                      Telephone No.:   (212) 622-0004






                               Credit Agreement
<PAGE>   91
                                   - 87 -


                                     DOCUMENTATION AGENT
                                     -------------------
                                     
                                     BARCLAYS BANK PLC
                                     
                                     
                                     By /s/ JOHN GIANONNE
                                       ---------------------
                                       Title: Director
                                     
                                     Address for Notices:
                                     
                                     Barclays Bank Plc
                                     c/o BZW
                                     222 Broadway
                                     New York, New York  10038
                                     
                                     Attention:  Michael Wynne
                                     
                                     Telecopier No.:  (212) 412-6709
                                     Telephone No.:   (212) 412-6788






                               Credit Agreement
<PAGE>   92
                                                                      SCHEDULE I

                                  Commitments

<TABLE>
<CAPTION>
Lenders                                              Amount
- -------                                              ------
<S>                                                <C>
THE CHASE MANHATTAN BANK                           $15,625,000

BARCLAYS BANK PLC                                   15,625,000

ABN AMRO BANK N.V.                                  14,750,000

BANK OF AMERICA NT&SA                               14,750,000

BANK OF MONTREAL                                    14,750,000

THE BANK OF NEW YORK                                14,750,000

THE BANK OF NOVA SCOTIA                             14,750,000

THE BANK OF TOKYO-MITSUBISHI,
  LTD., CHICAGO BRANCH                              14,750,000

BANQUE NATIONALE DE PARIS                           14,750,000

BAYERISCHE HYPOTHEKEN-UND
  WECHSEL-BANK
  AKTIENGESELLSCHAFT,
  NEW YORK BRANCH                                   14,750,000

CIBC INC.                                           14,750,000

CITIBANK, N.A.                                      14,750,000

CREDIT LYONNAIS
  CHICAGO BRANCH                                    14,750,000

CREDIT SUISSE                                       14,750,000

DEUTSCHE BANK, AG -
  CHICAGO BRANCH                                    14,750,000

DRESDNER BANK AG, NEW YORK AND
  GRAND CAYMAN BRANCHES                             14,750,000

THE FIRST NATIONAL BANK
  OF CHICAGO                                        14,750,000

THE INDUSTRIAL BANK OF JAPAN,
  LIMITED, NEW YORK BRANCH                          14,750,000

LTCB TRUST COMPANY                                  14,750,000
</TABLE>





                                   Schedule I
<PAGE>   93
                                     - 2 -

<TABLE>
<S>                                                 <C>
THE MITSUBISHI TRUST AND
  BANKING CORPORATION                               14,750,000

NATIONSBANK OF TEXAS, N.A.                          14,750,000

ROYAL BANK OF CANADA                                14,750,000

THE SANWA BANK, LIMITED
  NEW YORK BRANCH                                   14,750,000

SOCIETE GENERALE                                    14,750,000

TORONTO-DOMINION (NEW YORK),
  INC.                                              14,750,000

UNION BANK OF SWITZERLAND,
  NEW YORK BRANCH                                   14,750,000

WESTDEUTSCHE LANDESBANK
  GIROZENTRALE,
  NEW YORK BRANCH                                   14,750,000

THE ASAHI BANK, LTD.                                10,000,000

AUSTRALIA AND NEW ZEALAND
  BANKING GROUP LIMITED                             10,000,000

BANCA COMMERCIALE ITALIANA -
  NEW YORK BRANCH                                   10,000,000

BANCA CRT S.P.A.                                    10,000,000

BANCA MONTE DEI PASCHI DI
  SIENA SPA                                         10,000,000

BANCA NAZIONALE DEL LAVORO
  S.P.A. - NEW YORK BRANCH                          10,000,000

BANK AUSTRIA
  AKTIENGESELLSCHAFT                                10,000,000

BANK OF IRELAND                                     10,000,000

BAYERISCHE LANDESBANK
   GIROZENTRALE
  CAYMAN ISLANDS BRANCH                             10,000,000

BHF-BANK AKTIENGESELLSCHAFT                         10,000,000
</TABLE>





                                   Schedule I
<PAGE>   94
                                     - 3 -

<TABLE>
<S>                                                 <C>
CAISSE NATIONALE DE CREDIT
  AGRICOLE (CNCA)                                   10,000,000

COMMERZBANK AG                                      10,000,000

COMPAGNIE FINANCIERE DE CIC
  ET DE L'UNION EUROPEENNE                          10,000,000

COOPERATIEVE CENTRALE
   RAIFFEISEN-BOERENLEENBANK
  B.A., "RABOBANK
  NEDERLAND", NEW YORK BRANCH                       10,000,000

CREDIT LOCAL DE FRANCE,
  NEW YORK AGENCY                                   10,000,000

THE DAI-ICHI KANGYO BANK, LTD.                      10,000,000

EXPORT DEVELOPMENT CORPORATION                      10,000,000

THE FIRST NATIONAL BANK
  OF BOSTON                                         10,000,000

FLEET NATIONAL BANK                                 10,000,000

THE FUJI BANK, LIMITED
  CHICAGO BRANCH                                    10,000,000

GULF INTERNATIONAL BANK B.S.C.                      10,000,000

ISTITUTO BANCARIO SAN PAOLO
  DI TORINO S.P.A.                                  10,000,000

KB FINANCIAL SERVICES (IRELAND)                     10,000,000

LANDESBANK HESSEN-THURINGEN
  GIROZENTRALE                                      10,000,000

MERITA BANK LTD.-
  NEW YORK BRANCH                                   10,000,000

THE MITSUI TRUST AND BANKING
  COMPANY, LIMITED                                  10,000,000

THE NIPPON CREDIT BANK, LTD.                        10,000,000

THE NORTHERN TRUST COMPANY                          10,000,000
</TABLE>





                                   Schedule I
<PAGE>   95
                                     - 4 -

<TABLE>
<S>                                               <C>
PNC BANK, NATIONAL ASSOCIATION                      10,000,000

THE SAKURA BANK, LIMITED                            10,000,000

THE SUMITOMO TRUST &
  BANKING CO., LTD.,
  NEW YORK BRANCH                                   10,000,000

SWISS BANK CORPORATION,
  NEW YORK BRANCH                                   10,000,000

THE TOKAI BANK, LIMITED                             10,000,000

UNION BANK OF CALIFORNIA, N.A.                      10,000,000

YASUDA TRUST & BANKING CO.,
  LTD.                                              10,000,000
                                                              
                                                ----------------

                                                  $750,000,000
</TABLE>





                                   Schedule I
<PAGE>   96
                                                                     SCHEDULE II

           Applicable Lending Offices & Addresses for Notices

(1) THE CHASE MANHATTAN BANK

     Applicable Lending Office:
 
             Base Rate Loans:
             The Chase Manhattan Bank
             270 Park Avenue
             New York, NY  10017

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Archie Rigopoulis
             The Chase Manhattan Bank
             Agent Bank Services Group
             140 East 45th Street
             29th Floor
             New York, NY  10017

             Telephone:  (212) 622-0013
             Fax:        (212) 622-0002


(2) BARCLAYS BANK PLC

     Applicable Lending Office:

             Base Rate Loans:
             Barclays Bank PLC
             BZW
             222 Broadway
             New York, NY 10038


             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             John Livingston
             Barclays Bank PLC
             222 Broadway
             New York, NY  10038

             Telephone:  (212) 412-7588
             Fax:        (212) 412-7511





                                  Schedule II
<PAGE>   97
                                     - 2 -

(3) ABN AMRO BANK N.V.

     Applicable Lending Office:
     
             Base Rate Loans:
             ABN Amro Bank, N.V., Chicago Branch
             135 South LaSalle Street, Suite 625
             Chicago, IL 60674-9135

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Joanna M. Riopelle
             ABN Amro Bank, N.V.
             Chicago Branch
             135 South LaSalle St.
             Suite 625
             Chicago IL  60674-9135

             Telephone:  (312) 904-2955
             Fax:        (312) 904-8425

(4) THE ASAHI BANK, LTD.

     Applicable Lending Office:

             Base Rate Loans:
             The Asahi Bank, Ltd.
             1 World Trade Center, Suite 6011
             New York, NY  10048-0476

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Douglas E. Price
             The Asahi Bank, Ltd.
             1 World Trade Center
             Suite 6011
             New York, NY  10048-0476

             Telephone:  (212) 912-7037
             Fax:        (212) 432-1135





                                  Schedule II
<PAGE>   98
                                     - 3 -

(5) AUSTRALIA AND NEW ZEALAND BANKING GROUP LIMITED

     Applicable Lending Office:
     
             Base Rate Loans:
             Australia and New Zealand Banking Group Limited
             1177 Avenue of the Americas
             New York, NY  10036

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Robert Sloan
             Australia and New Zealand Banking
               Group Limited
             1177 Avenue of the Americas
             New York, NY  10036

             Telephone:  (212) 801-9800
             Fax:        (212) 801-9131

(6) BANCA COMMERCIALE ITALIANA - NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Banca Commerciale Italiana
             One William Street
             New York, NY  10004

             ii) Eurodollar Loans:
                    -same as above-

     Address for Notices:

             Sara Kim
             Banca Commerciale Italiana
             One William Street
             New York, NY  10004

             Telephone:  (212) 607-3868
             Fax:        (212) 809-2124





                                  Schedule II
<PAGE>   99
                                     - 4 -

(7) BANCA CRT S.P.A.

     Applicable Lending Office:

             Base Rate Loans:
             Banca CRT S.p.A., New York Branch
             500 Park Avenue
             New York, NY  10022

             Eurodollar Loans:
             Banca CRT S.p.A., Cayman Branch
             c/o 500 Park Avenue
             New York, NY  10022

     Address for Notices:

             William J. O'Brien
             Banca CRT S.p.A.,
               NEW YORK BRANCH
             500 Park Avenue
             New York, NY  10022

             Telephone:  (212) 980-3884
             Fax:        (212) 980-0809

(8) BANCA MONTE DEI PASCHI DI SIENA SPA

     Applicable Lending Office:

             Base Rate Loans:
             Banca Monte Dei Paschi Di Siena SpA
             245 Park Avenue - 26th Floor
             New York, NY  10167

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Robert E. Woods
             Banca Monte Dei Paschi Di Siena SpA
             245 Park Avenue
             26th Floor
             New York, NY  10167

             Telephone:  (212) 557-8111
             Fax:        (212) 557-8039





                                  Schedule II
<PAGE>   100
                                     - 5 -

(9) BANCA NAZIONALE DEL LAVORO S.P.A. - NEW YORK BRANCH

     Applicable Lending Office:
     
             Base Rate Loans:
             Banca Nazionale del Lavoro S.p.A. - New York Branch
             25 West 51st Street
             New York, NY  10019

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Giulio Giovine
             Banca Nazionale del Lavoro S.p.A.
             New York Branch
             25 West 51st Street
             New York, NY  10019

             Telephone:  (212) 581-0710
             Fax:        (212) 765-2978

(10) BANK AUSTRIA AKTIENGESELLSCHAFT

     Applicable Lending Office:

             Base Rate Loans:
             Bank Austria Aktiengesellschaft, New York Branch
             565 Fifth Avenue
             New York, NY  10017

             Eurodollar Loans:
             Bank Austria, Grand Cayman Branch
             565 Fifth Avenue
             New York, NY  10017

     Address for Notices:

             Jonathan Bakker
             Bank Austria Aktiengesellschaft
             New York Branch
             565 Fifth Avenue
             New York, NY  10017

             Telephone:  (212) 880-1074
             Fax:        (212) 880-1080





                                  Schedule II
<PAGE>   101
                                     - 6 -

(11) BANK OF AMERICA NT&SA

     Applicable Lending Office:

             Base Rate Loans:
             Bank of America NT&SA
             1850 Gateway Boulevard
             Concord, CA  94520

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Doug Bontemps
             Bank of America NT&SA
             335 Madison Avenue
             New York, NY  10017

             Telephone:  (212) 503-8074
             Fax:        (212) 503-7878

(12) BANK OF IRELAND

     Applicable Lending Office:

             Base Rate Loans:
             Bank of Ireland International Finance
             La Touche House, I.F.S.C., Custom House Docks
             Dublin 1, Ireland

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Niamf O'Flynn
             Bank of Ireland International Finance
             La Touche House, I.F.S.C.
             Custom House Docks
             Dublin 1, Ireland

             Telephone:  (353 1) 609 3491
             Fax:        (353 1) 829 0129





                                  Schedule II
<PAGE>   102
                                     - 7 -

(13) BANK OF MONTREAL

     Applicable Lending Office:

             Base Rate Loans:
             Bank of Montreal
             115 South LaSalle Street
             Chicago, IL 60603

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Patrick Keleher
             Bank of Montreal
             430 Park Avenue
             New York, NY 10022

             Telephone:  (212) 605-1477
             Fax:        (212) 605-1648/1621

(14) THE BANK OF NEW YORK

     Applicable Lending Office:

             Base Rate Loans:
             The Bank of New York
             One Wall Street - 18th Floor
             New York, NY 10286

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             James Whitaker
             The Bank of New York
             One Wall Street
             16th Floor
             New York, NY 10286

             Telephone:  (212) 635-8843
             Fax:        (212) 635-8595





                                  Schedule II
<PAGE>   103
                                     - 8 -

(15) THE BANK OF NOVA SCOTIA

     Applicable Lending Office:

             Base Rate Loans:
             The Bank of Nova Scotia
             600 Peachtree St. NE, Suite 2700
             Atlanta, GA 30308

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Keith Rauschenberger
             The Bank of Nova Scotia
             181 W. Madison Street
             Suite 3700
             Chicago, IL 60602

             Telephone:  (312) 201-4183
             Fax:        (312) 201-4108

(16) THE BANK OF TOKYO-MITSUBISHI, LTD., CHICAGO BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             The Bank of Tokyo-Mitsubishi, Ltd., Chicago Branch
             227 W. Monroe Street, Suite 2300
             Chicago, IL 60606

             Eurodollar Loans:
                  -same as above-

     Address for Notices:
             Wayne Yamanaka
             The Bank of Tokyo-Mitsubishi, Ltd., Chicago Branch
             227 W. Monroe Street
             Suite 2300
             Chicago, IL 60606

             Telephone:  (312) 696-4664
             Fax:        (312) 696-4535





                                  Schedule II
<PAGE>   104
                                     - 9 -

(17) BANQUE NATIONALE DE PARIS

     Applicable Lending Office:

             Base Rate Loans:
             Banque Nationale de Paris
             209 S. LaSalle
             Chicago, IL 60604

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Rosalie Hawley
             Banque Nationale De Paris
             209 S. LaSalle
             Chicago, IL 60604

             Telephone:  (312) 977-2203
             Fax:        (312) 977-1380

(18) BAYERISCHE HYPOTHEKEN- UND WECHSEL-BANK AKTIENGESELLSCHAFT,
          NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Bayerische Hypotheken- und Wechsel-Bank
               Aktiengesellschaft, New York Branch
             Financial Square, 32 Old Slip
             New York, NY 10005

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Christian Walter
             Bayerische Hypotheken- und Wechsel-Bank
               Aktiengesellschaft, New York Branch
             Financial Square, 32 Old Slip
             New York, NY 10005

             Telephone:  (212) 440-0742
             Fax:        (212) 440-0741





                                  Schedule II
<PAGE>   105
                                     - 10 -

(19) BAYERISCHE LANDESBANK GIROZENTRALE, CAYMAN ISLANDS BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Bayerische Landesbank Girozentrale, Cayman Islands
               Branch
             560 Lexington Avenue - 17th Floor
             New York, NY 10022

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Patricia Sanchez
             Bayerische Landesbank Girozentrale, Cayman Islands
               Branch
             560 Lexington Avenue
             17th Floor
             New York, NY 10022

             Telephone:  (212) 310-9810
             Fax:        (212) 310-9868





                                  Schedule II
<PAGE>   106
                                     - 11 -

(20) BHF-BANK AKTIENGESELLSCHAFT

     Applicable Lending Office:

             Base Rate Loans:
             BHF-BANK AG, New York Branch
             590 Madison Avenue
             New York, NY 10022-2540

             Eurodollar Loans:
             BHF-BANK AG, Grand Cayman Branch
             c/o BHF-BANK AG, NY Branch
             590 Madison Avenue
             New York, NY  10022-2540

     b) Address for Notices:

             John W. Holmquist
             BHF-BANK Aktiengesellschaft
             111 West Ocean Boulevard
             Suite 1325
             Long Beach, CA 90832-2186


             Telephone:  (310) 983-5009
             Fax:        (310) 983-5015





                                  Schedule II
<PAGE>   107
                                     - 12 -

(21) CAISSE NATIONALE DE CREDIT AGRICOLE (CNCA)

     Applicable Lending Office:

             Base Rate Loans:
             Caisse Nationale De Credit Agricole (CNCA)
             55 E. Monroe, 47th Floor
             Chicago, IL 60603

             Eurodollar Loans:
             CNCA-Chicago
             55 E. Monroe, 47th Floor
             Chicago, IL  60603

     Address for Notices:

             Phillip Salter
             Caisse Nationale De Credit Agricole (CNCA)
             55 E. Monroe, 47th Floor
             Chicago, IL 60603

             Telephone:  (312) 917-7417
             Fax:        (312) 372-2830





                                  Schedule II
<PAGE>   108
                                     - 13 -

(22) CIBC INC.

     Applicable Lending Office:

             Base Rate Loans:
             CIBC Inc.
             Two Paces Ferry Road
             2727 Paces Ferry Road
             Suite 1200
             Atlanta, GA 30339

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Miriam McCart
             CIBC Inc.
             Two Paces Ferry Road
             2727 Paces Ferry Road
             Suite 1200
             Atlanta, GA 30339

             Telephone:  (770) 319-4842
             Fax:        (770) 319-4950





                                  Schedule II
<PAGE>   109
                                     - 14 -

(23) CITIBANK, N.A.

     Applicable Lending Office:

             Base Rate Loans:
             Citibank, N.A.
             399 Park Avenue
             New York, NY 10043

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             James M. Walsh
             Citibank, N.A.
             399 Park Avenue
             New York, NY 10043

             Telephone:  (212) 559-7538
             Fax:        (212) 593-0054

(24) COMMERZBANK AG

     Applicable Lending Office:

             Base Rate Loans:
             Commerzbank Ag Grand Cayman Branch
             2 World Financial Center
             New York, NY 10281

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Andrew Jacobyansky
             Commerzbank Ag Grand Cayman Branch
             2 World Financial Center
             New York, NY 10281

             Telephone:  (212) 266-7568
             Fax:        (212) 266-7530





                                  Schedule II
<PAGE>   110
                                     - 15 -


(25) COMPAGNIE FINANCIERE DE CIC ET DE L'UNION EUROPEENNE

     Applicable Lending Office:

             Base Rate Loans:
             Compagnie Financiere De Cic Et De L'Union Europeenne
             520 Madison Avenue, 37th Floor
             New York, NY 10022

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Albert M. Calo
             Compagnie Financiere De Cic Et De L'Union Europeenne
             520 Madison Avenue
             37th Floor
             New York, NY 10022

             Telephone:  (212) 715-4425
             Fax:        (212) 715-4535

(26) CREDIT LOCAL DE FRANCE, NEW YORK AGENCY

     Applicable Lending Office:

             Base Rate Loans:
             Credit Local de France
             450 Park Avenue, 3rd Floor
             New York, NY 10022

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Michael Wiskind
             Credit Local de France
             450 Park Avenue, 3rd Floor
             New York, NY 10022

             Telephone:  (212) 753-2349
             Fax:        (212) 753-5522





                                  Schedule II
<PAGE>   111
                                     - 16 -

(27) CREDIT LYONNAIS CHICAGO BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Credit Lyonnais Chicago Branch
             227 West Monroe Street
             Suite 3800
             Chicago, IL 60606

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             David Payne
             Credit Lyonnais Chicago Branch
             227 West Monroe Street
             Suite 3800
             Chicago, IL 60606

             Telephone:  (312) 220-7310
             Fax:        (312) 641-0527

(28) CREDIT SUISSE

     Applicable Lending Office:

             Base Rate Loans:
             Hazel Leslie
             Risk Management
             Credit Suisse
             12 East 49th Street
             New York, NY 10017

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Michael Viazzoli
             cc:  Jackie Bragen
             Credit Suisse
             227 West Monroe Street
             Suite 4000
             Chicago, IL 60606

             Telephone:  (312) 630-0086
             Fax:        (312) 630-0359





                                  Schedule II
<PAGE>   112
                                     - 17 -

(29) THE DAI-ICHI KANGYO BANK, LTD.

     Applicable Lending Office

             Base Rate Loans:
             The Dai-Ichi Kangyo Bank, Ltd.
             1 World Trade Center, 48th Floor
             New York, NY 10048

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Takeshi Kurita
             The Dai-Ichi Kangyo Bank, Ltd.
             1 World Trade Center, 48th Floor
             New York, NY 10048

             Telephone:  (212) 432-6616
             Fax:        (212) 488-8955

(30) DEUTSCHE BANK AG - CHICAGO BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Deutsche Bank AG, Chicago Branch
             227 West Monroe, Suite 4350
             Chicago, IL 60606

             Eurodollar Loans:
             Deutsche Bank AG, Cayman Islands Branch
             c/o Deutsche Bank AG, New York Branch
             31 West 52nd Street
             New York, NY  10019

     Address for Notices:

             Hans Roderich
             Deutsche Bank AG, Chicago Branch
             227 West Monroe, Suite 4350
             Chicago, IL 60606

             Telephone:  (312) 578-4100
             Fax:        (312) 578-4111

                                  Schedule II
<PAGE>   113
                                     - 18 -

(31) DRESDNER BANK AG, NEW YORK AND GRAND CAYMAN BRANCHES

     Applicable Lending Office:

             Base Rate Loans:
             Dresdner Bank
             75 Wall Street
             New York, NY  10005-2889


             Eurodollar Loans:
             -same as above-

     Address for Notices:

             Lawrence Jones
             Dresdner Bank (New York)
             75 Wall Street
             New York, NY  10005-2889


             Telephone:  (212) 429-2730
             Fax:        (212) 429-2129

(32) EXPORT DEVELOPMENT CORPORATION

     Applicable Lending Office:

             Base Rate Loans:
             Export Development Corporation
             151 O'Connor Street
             Ottawa, Ontario K1A 1K3
             Canada

             Eurodollar Loans:
             -same as above-

     Address for Notices:

             Robert Forbes
             Export Development Corporation
             151 O'Connor Street
             Ottawa, Ontario K1A 1K3
             Canada

             Telephone:  (613) 598-2844
             Fax:        (613) 598-6858


                                  Schedule II
<PAGE>   114
                                     - 19 -

(33) THE FIRST NATIONAL BANK OF BOSTON

     Applicable Lending Office:

             Base Rate Loans:
             The First National Bank of Boston
             100 Federal Street
             Boston, MA 02110

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Lisa Gallagher
             The First National Bank of Boston
             100 Federal Street
             Boston, MA 02110

             Telephone:  (617) 434-7156
             Fax:        (617) 434-3401

(34) THE FIRST NATIONAL BANK OF CHICAGO

     Applicable Lending Office:

             Base Rate Loans:
             The First National Bank of Chicago
             One First National Plaza
             Chicago, IL 60670-0324

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Michael W. McCorkle
             The First National Bank of Chicago
             One First National Plaza
             Chicago, IL 60670-0324

             Telephone:  (312) 732-3568
             Fax:        (312) 732-5296


                                  Schedule II
<PAGE>   115
                                     - 20 -

(35) FLEET NATIONAL BANK

     Applicable Lending Office:

             Base Rate Loans:
             Fleet National Bank
             75 State Street
             Boston, MA  02109

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Paula H. Lang
             Fleet National Bank
             75 State Street
             Boston, MA  02109

             Telephone:  (617) 346-3773
             Fax:        (617) 346-3777

(36) THE FUJI BANK, LIMITED CHICAGO BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             The Fuji Bank, Limited Chicago Branch
             225 West Wacker Drive, Suite 2000
             Chicago, IL  60606

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Robert W. Heller
             THE Fuji Bank, Limited
               Chicago Branch
             225 West Wacker Drive
             Suite 2000
             Chicago, IL  60606

             Telephone:  (312) 621-0521
             Fax:        (312) 621-0539


                                  Schedule II
<PAGE>   116
                                     - 21 -

(37) GULF INTERNATIONAL BANK B.S.C.

     Applicable Lending Office:

             Base Rate Loans:
             Gulf International Bank B.S.C.
             380 Madison Avenue
             New York, NY  10017

             Eurodollar Loans:
             Gulf International Bank B.S.C. Grand Cayman Branch
             c/o New York Branch, 380 Madison Avenue
             New York, NY  10017

     Address for Notices:

             Thomas E. Fitzherbert
             Gulf International Bank B.S.C.
             380 Madison Avenue
             New York, NY  10017

             Telephone:  (212) 922-2320
             Fax:        (212) 922-2309/2339

(38) THE INDUSTRIAL BANK OF JAPAN,
       LIMITED, NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             The Industrial Bank of Japan,
               Limited, New York Branch
             245 Park Avenue, 23rd Floor
             New York, NY  10167

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             William Chin
             The Industrial Bank of Japan,
               Limited, New York Branch
             245 Park Avenue, 23rd Floor
             New York, NY  10167

             Telephone:  (212) 309-6674
             Fax:        (212) 661-8629


                                  Schedule II
<PAGE>   117
                                     - 22 -

(39) ISTITUTO BANCARIO SAN PAOLO DI TORINO S.p.A.

     Applicable Lending Office:

             Base Rate Loans:
             Istituto Bancario San Paolo Di Torino S.p.A.
             245 Park Avenue, 35th Floor
             New York, NY  10167

             Eurodollar Loans:
             Istituto Bancario San Paolo Di Torino Bahamas S.p.A.
             245 Park Avenue, 35th Floor
             New York, NY  10167

     Address for Notices:

             Luca Sacchi
             Istituto Bancario San Paolo
               Di Torino S.p.A.
             245 Park Avenue
             35th Floor
             New York, NY  10167

             Telephone:  (212) 692-3130
             Fax:        (212) 599-5303

(40) KB FINANCIAL SERVICES (IRELAND)

     Applicable Lending Office:

             Base Rate Loans:
             KBFSI c/o Kredietbank N.V.
             125 West 55th Street
             New York, NY  10019

             Eurodollar Loans:
             KBFSI (Paul O'Leary)
             91 Merrion Square
             Dublin 2, Ireland

     Address for Notices:

             Faicra Nagle/John Kirwan
             KBFSI
             IFSC House, Customs House Quay
             Dublin 1, Ireland

             Telephone:  (011) 35-31-670-0888
             Fax:        (011) 35-31-670-0855


                                  Schedule II
<PAGE>   118
                                     - 23 -

(41) LANDESBANK HESSEN-THURINGEN GIROZENTRALE

     Applicable Lending Office:

             Base Rate Loans:
             Landesbank Hessen-Thuringen Girozentrale
             420 Fifth Avenue, 24th Floor
             New York, NY  10018

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Cornelius J. McMorrow
             Landesbank Hessen-Thuringen
               Girozentrale
             420 Fifth Avenue
             24th Floor
             New York, NY  10018

             Telephone:  (212) 703-5224
             Fax:        (212) 703-5256

(42) LTCB TRUST COMPANY

     Applicable Lending Office:

             Base Rate Loans:
             LTCB Trust Company
             165 Broadway, 49th Floor
             New York, NY  10006

             Eurodollar Loans:
                  -same as above-
     Address for Notices:

             Tetsuya Fukunaga
             LTCB Trust Company
             165 Broadway
             49th Floor
             New York, NY  10006

             Telephone:  (212) 335-4549
             Fax:        (212) 608-2371


                                  Schedule II
<PAGE>   119
                                     - 24 -

(43) MERITA BANK LTD - NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Merita Bank Ltd - New York Branch
             437 Madison Avenue, 21st Floor
             New York, NY  10022

             Eurodollar Loans:
                  -same as above-
     Address for Notices:

             Charles J. Lansdown
             Merita Bank Ltd,
               New York Branch
             437 Madison Avenue
             21st Floor
             New York, NY  10022

             Telephone:  (212) 318-9562
             Fax:        (212) 421-4420

(44) THE MITSUBISHI TRUST AND BANKING CORPORATION

     Applicable Lending Office:

             Base Rate Loans:
             The Mitsubishi Trust and Banking Corporation
             520 Madison Avenue
             New York, NY  10022

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Anthony Rock
             The Mitsubishi Trust and
               Banking Corporation
             520 Madison Avenue
             New York, NY  10022

             Telephone:  (212) 891-8425
             Fax:        (212) 844-6825 or 593-4691


                                  Schedule II
<PAGE>   120
                                     - 25 -

(45) THE MITSUI TRUST AND BANKING COMPANY, LIMITED

     Applicable Lending Office:

             Base Rate Loans:
             THE Mitsui Trust and Banking Company, Limited
             One World Financial Ctr, 21st Floor
             200 Liberty Street
             New York, NY  10281

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Paul Dellova, Jr.
             The Mitsui Trust and Banking
               Company, Limited
             One World Financial Center
             21st Floor
             200 Liberty Street
             New York, NY  10281

             Telephone:  (212) 341-0469
             Fax:        (212) 945-4171/4170

(46) NATIONSBANK OF TEXAS, N.A.

     Applicable Lending Office:

             Base Rate Loans:
             Nationsbank of Texas, N.A.
             901 Main Street
             Dallas, TX  75202

             ii) Eurodollar Loans:
                    -same as above-

     Address for Notices:

             Tony Cacheria
             Nationsbank of Texas, N.A.
             901 Main Street
             64th Floor
             Dallas, TX  75202

             Telephone:  (214) 508-0157
             Fax:        (214) 508-9390


                                  Schedule II
<PAGE>   121
                                     - 26 -

(47) THE NIPPON CREDIT BANK, LTD.

     Applicable Lending Office:

             Base Rate Loans:
             The Nippon Credit Bank, Ltd.
             245 Park Avenue
             New York, NY  10167

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Peter Capitelli
             The Nippon Credit Bank, Ltd.
             245 Park Avenue
             New York, NY  10167
             Telephone:  (212) 984-1331
             Fax:        (212) 490-3895

(48) THE NORTHERN TRUST COMPANY

     Applicable Lending Office:

             Base Rate Loans:
             The Northern Trust Company
             50 S. LaSalle Street
             Chicago, IL  60675

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Diane M. Baer
             The Northern Trust Company
             50 S. LaSalle Street
             Chicago, IL  60675

             Telephone:  (312) 444-5802
             Fax:        (312) 444-5055


                                  Schedule II
<PAGE>   122
                                     - 27 -

(49) PNC BANK, NATIONAL ASSOCIATION

     Applicable Lending Office:

             Base Rate Loans:
             PNC Bank, N.A.
             100 South Broad Street
             9th Floor
             Philadelphia, PA  19101

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Tom Partridge
             PNC Bank, N.A.
             100 South Broad Street
             9th Floor
             Philadelphia, PA  19101

             Telephone:  (215) 585-8457
             Fax:        (215) 585-6680


                                  Schedule II
<PAGE>   123
                                     - 28 -

(50) COOPERATIVE CENTRALE RAIFFEISEN-BOERENLEENBANK B.A.,
       "RABOBANK NEDERLAND", NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Rabobank Nederland, New York Branch
             Corporate Services
             215 Park Avenue
             New York, NY  10167

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Douglas W. Zylstra
             Rabobank Nederland
             300 South Wacker Drive
             Suite 3500
             Chicago, IL  60606

             Telephone:  (312) 408-8248
             Fax:        (312) 786-0052

             with a copy to:

             Guillermo Bilbao
             Rabobank Nederland
             245 Park Avenue
             New York, NY  10167

             Telephone:  (212) 916-7864
             Fax:        (212) 916-7880


                                  Schedule II
<PAGE>   124
                                     - 29 -

(51) ROYAL BANK OF CANADA

     Applicable Lending Office:

             Base Rate Loans:
             Royal Bank of Canada, New York Branch
             Financial Square, 23rd Floor
             New York, NY  10005-3531

             Eurodollar Loans:
             Royal Bank of Canada, New York Branch
             Financial Square
             23rd Floor
             New York, NY  10005-3531

     Address for Notices:

             Royal Bank of Canada
             New York Branch
             Financial Square, 23rd Floor
             New York, NY  10005-3531
             Attention:  Manager, Credit Administration

             Telephone:  (212) 428-6311
             Fax:        (212) 428-2372

             with a copy to:

             John Page
             Royal Bank of Canada
             Financial Square
             24th Floor
             New York, NY  10005-3531

             Telephone:  (212) 428-6551
             Fax:        (212) 428-6460


                                  Schedule II
<PAGE>   125
                                     - 30 -

(52) THE SAKURA BANK, LIMITED

     Applicable Lending Office:

             Base Rate Loans:
             The Sakura Bank, Limited, New York Branch
             277 Park Avenue, 46th Floor
             New York, NY  10172-0098

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Mr. Kazuhiro Kuramoto
             The Sakura Bank, Limited,
               New York Branch
             277 Park Avenue
             46th Floor
             New York, NY  10172-0098

             Telephone:  (212) 756-6802
             Fax:        (212) 888-7651

(53) THE SANWA BANK, LIMITED
        NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             The Sanwa Bank, Limited
               New York Branch
             55 East 52nd Street
             New York, NY  10055

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Laurance J. Bressler
             The Sanwa Bank, Limited
               New York Branch
             55 East 52nd Street
             New York, NY  10055

             Telephone:  (212) 339-6213
             Fax:        (212) 754-2360


                                  Schedule II
<PAGE>   126
                                     - 31 -

(54) SOCIETE GENERALE

     Applicable Lending Office:

             Base Rate Loans:
             Societe Generale
             181 West Madison Street-Suite 3400
             Chicago, Illinois  60602

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Seth Asofsky
             Societe Generale
             181 West Madison Street
             Suite 3400
             Chicago, IL  60602

             Telephone:  (312) 578-5055
             Fax:        (312) 578-5099

(55) THE SUMITOMO TRUST & BANKING CO., LTD., NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             The Sumitomo Trust & Banking Co., Ltd.,
               New York Branch
             527 Madison Avenue
             New York, NY  10022

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Robin Schreiber
             The Sumitomo Trust & Banking Co., Ltd.,
               New York Branch
             527 Madison Avenue
             New York, NY  10022

             Telephone:  (212) 326-0781
             Fax:        (212) 418-4848


                                  Schedule II
<PAGE>   127
                                     - 32 -

(56) SWISS BANK CORPORATION, NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Swiss Bank Corporation, New York Branch
             222 Broadway
             New York, NY  10038

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Sean Kelly
             Swiss Bank Corporation,
               New York Branch
             222 Broadway
             4th Floor
             New York, NY  10038

             Telephone:  (212) 335-1875
             Fax:        (212) 574-3228

(57) THE TOKAI BANK, LIMITED

     Applicable Lending Office:

             Base Rate Loans:
             The Tokai Bank, Limited New York Branch
             55 East 52nd Street
             New York, NY  10055

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             John Quigley
             The Tokai Bank, Limited
               New York Branch
             55 East 52nd Street
             New York, NY  10055

             Telephone:  (212) 339-1091
             Fax:        (212) 754-2170


                                  Schedule II
<PAGE>   128
                                     - 33 -

(58) TORONTO DOMINION (NEW YORK), INC.

     Applicable Lending Office:

             Base Rate Loans:
             Toronto Dominion (New York), Inc.
             909 Fannin Street, 17th Floor
             Houston, TX  77010

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Debbie Greene
             The Toronto-Dominion Bank
             909 Fannin Street
             17th Floor
             Houston, TX  77010

             Telephone:  (713) 653-8245
             Fax:        (713) 951-9921

(59) UNION BANK OF CALIFORNIA, N.A.

     Applicable Lending Office:

             Base Rate Loans:
             Union Bank of California
             445 S. Figueroa Street
             Los Angeles, CA  90071

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             Kevin Sampson
             Union Bank of California
             445 S. Figueroa Street
             Suite 700
             Los Angeles, CA  90071

             Telephone:  (213) 236-6585
             Fax:        (213) 236-5747


                                  Schedule II
<PAGE>   129
                                     - 34 -

(60) UNION BANK OF SWITZERLAND, NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Union Bank of Switzerland
             299 Park Avenue
             New York, NY  10171

             Eurodollar Loans:
             Union Bank of Switzerland, New York Branch
             299 Park Avenue
             New York, NY  10171

     Address for Notices:

             Richard Ennis
             Union Bank of Switzerland
             299 Park Avenue
             New York, NY  10171

             Telephone:  (212) 821-3949
             Fax:        (212) 821-3689

(61) WESTDEUTSCHE LANDESBANK GIROZENTRALE, NEW YORK BRANCH

     Applicable Lending Office:

             Base Rate Loans:
             Westdeutsche Landesbank Girozentrale,
               New York Branch
             1211 Avenues of the Americas
             New York, NY  10036

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             John B. Hall
             Westdeutsche Landesbank
               Girozentrale,
               Chicago Rep. Office
             181 West Madison Street
             Chicago, IL  60602

             Telephone:  (312) 553-1600
             Fax:        (312) 553-1608


                                  Schedule II
<PAGE>   130
                                     - 35 -

(62) YASUDA TRUST & BANKING CO., LTD.

     Applicable Lending Office:

             Base Rate Loans:
             Yasuda Trust & Banking Co., Ltd.
             666 Fifth Avenue, Suite 801
             New York, NY  10103

             Eurodollar Loans:
                  -same as above-

     Address for Notices:

             DoHoon Kim
             Yasuda Trust & Banking Co., Ltd.
             666 Fifth Avenue
             Suite 801
             New York, NY  10103

             Telephone:  (212) 373-5879
             Fax:        (212) 373-5796


                                  Schedule II
<PAGE>   131
                                                                    SCHEDULE III

                                   Litigation

                                     None.





                                  Schedule III
<PAGE>   132
                                                                     SCHEDULE IV

                    LLC Membership Interests & Equity Rights


Part A -- Members:

See attached Annex B from the Iridium LLC Limited Liability Company Agreement.

On the closing date Motorola will receive one Series B Class 2 Interest and 75
Series C Class 2 Interests



Part B -- Equity Rights:

Iridium LLC has issued or intends to issue the following Equity Rights:

1.       A warrant to Motorola (the "Motorola Warrant") to purchase Series M
         Class 2 Interests, the designations of which are as set forth in
         Section 4.04 of the LLC Agreement.

2.       Warrants to certain Members to purchase in the aggregate 68,427 Class
         1 Interests.

3.       Series A Class 2 Interests, the designations of which are as set forth
         in Section 4.05 of the LLC Agreement and which are convertible into
         Class 1 Interests.

4.       The Company is authorized to issue warrants to purchase up to 150,000
         Class 1 Interests to guarantors of its obligations under this Credit
         Agreement.

5.       The Company is authorized to issue warrants to purchase up to 122,200
         Class 1 Interests to gateway territory owners.





                                  Schedule IV





<PAGE>   133
                                    ANNEX B

                                   INTERESTS


<TABLE>
<CAPTION>
                                                                Series M            Series A         Series B          Series C
                                               Class 1         Convertible         Class 2           Class 2           Class 2
     Name and Business Address               Interests     Class 2 Interests       Interests         Interests         Interests
     -------------------------               ---------     -----------------       ---------         ---------         ---------
<S>                                          <C>                     <C>             <C>                  <C>               <C>
BCE Mobile Communications, Inc.                  --                  --              8,000                --                --
  8501 Trans Canada Highway                 
  ST - Laurent, Quebec                      
  Canada                                    
                                            
Iridium Africa Corporation                   40,000                  --                 --                --                --
  c/o Mawarid Services (UK) Ltd.            
  Barkeley Square House, 6th Floor          
  Barkeley Square                           
  London W1X 5PN England                    
                                            
Iridium Andes-Caribe                          2,000                  --                 --                --                --
  Ed. Maploca II - Piso 4                   
  Av. Principal de Los Cortijos de Lourdes  
  Caracas, Venezuela                        
                                            
Iridium Brasil S/A                            2,523                  --                 --                --                --
  CX. Postal 7060                           
  80021 - Curitiba - PR -                   
  Brazil                                    
                                            
Iridium Canada, Inc.                         70,000                  --                 --                --                --
  c/o BCE Mobile                            
  20 Carlson Court                          
  Etobloke, Ontario                         
  Canada  M9W 6V4                           
                                            
Iridium China (Hong Kong) Ltd.               70,000                  --                 --                --                --
  12/F Conic Investment Building           
  13 Hok Yuan Street                        
  Hunghom, Kowloon, Hong Kong               
                                            
Iridium Middle East Corporation              80,000                  --                 --                --                --
  c/o Carlyle International                 
  1001 Pennsylvania Ave., N.W.              
  Washington, D.C. 20004                    
</TABLE>





                                   ANNEX B
<PAGE>   134
                                    - 2 -

<TABLE>
<CAPTION>
                                                                 Series M           Series A          Series B          Series C
                                                Class 1         Convertible         Class 2           Class 2           Class 2
     Name and Business Address                Interests     Class 2 Interests       Interests         Interests         Interests
     -------------------------                ---------     -----------------       ---------         ---------         ---------
<S>                                              <C>                  <C>            <C>                   <C>               <C>
  -or-                                      

  c/o Mawarid Services (UK) Ltd.            
  Berkeley Square House, 6th Floor          
  Berkeley Square                           
  London W1X 5PN England                    
                                            
Iridium India Telecom Limited                     70,000              --                 --                --                --
  c/o Industrial Development Bank of India  
  IBDI Tower, Cuffe Parade                  
  Bombay - 400 005 India                    
                                            
Iridium SudAmerica Corporation                   140,000              --                 --                --                --
  Ed. Maploca II - Piso 4                   
  Av. Principal de Los Cortijos de Lourdes  
  Caracas, Venezuela                        
                                            
Khrunichev State Research and               
  Production Space Center                         70,000              --             11,775                --                --
    18, Novozsvodskaja St.                  
    Moscow 121309                           
    Russian Federation                      
                                            
Korea Mobile Telecommunications             
  Corporation                                     70,000              --             11,775                --                --
    6th Floor, Namsan Green Building 267    
    5-ga, Namdaemunno                       
   Chung-gue, Seoul Korea                   
                                            
Lockheed Martin Corporation                       20,000              --                 --                --                --
  1111 Lockheed Way                         
  ORGN 50-01, Bldg. 104                     
  Sunnyvale, CA  94089                      
                                            
Motorola, Inc.                                   318,919              --                 --                --                --
  1303 East Algonquin Rd.                   
  Schaumburg, IL  60196                     
                                            
Nippon Iridium (Bermuda) Limited                 210,000              --                 --                --                --
  c/o NIPPON IRIDIUM CORPORATION            
</TABLE>





                                   ANNEX B
<PAGE>   135
                                    - 3 -

<TABLE>
<CAPTION>
                                                                  Series M           Series A          Series B          Series C
                                                 Class 1         Convertible         Class 2           Class 2           Class 2
     Name and Business Address                 Interests     Class 2 Interests       Interests         Interests         Interests
     -------------------------                 ---------     -----------------       ---------         ---------         ---------
<S>                                             <C>                    <C>            <C>                   <C>              <C>
Ichibancho FS Building 8                      
  Ichibancho Chiyoda-ku                       
  Tokyo 102 Japan                             
                                              
Pacific Electric Wire & Cable, Co., Ltd.           70,000              --                 --                --                --
  4th Floor, Pacific Commercial Bldg.         
  285, Chung Hsiao East Road, Section 4       
  Taipel 106, Taiwan                          
                                              
Raytheon Company                                   12,000              --                 --                --                --
  1001 Boston Post Road                       
  Marlboro, MA  01752                        
                                              
STET - Societa Finanziaria Telefonica              60,000              --                 --                --                --
  per Azioni                                  
    c/o Telecom Italia SpA                    
    Via Flaminia 189                          
    00196 Rome Italy                          
                                              
Sprint Iridium, Inc.                               70,000              --             11,775                --                --
  2330 Shawnee Mission Parkway                
  Westwood, KS  66205                         
                                              
Thai Satellite Telecommunications Co.,             70,000              --                 --                --               --
  Ltd.                                        
    c/o United Communication                  
      Industry Co. Ltd.                       
    20 Phahonyothin Rd.                       
    Soi 11 Phayathai                          
    Bangkok 10400, Thailand                   
                                              
VEBACOM Holdings, Inc.                            165,705              --                 --                --                --
  c/o VEBACOM GmbH                            
  Am. Bonneshof 35                            
  D-40474 Dusseldorf Germany                  
                                              
          Totals                                1,611,147              --             43,325                --                --
</TABLE>





                                   ANNEX B
<PAGE>   136
                                                                      SCHEDULE V

                          Subsidiaries and Investments

                        [See Sections 7.13 and 8.08(a)]

Part A -- Subsidiaries:


None.



Part B -- Other Investments:


None.





                                   Schedule V
<PAGE>   137
                                                                     SCHEDULE VI

                                  Indebtedness

                             [See Section 8.07(b)]



1.       $480,150,000 principal amount at maturity of 14 1/2% Senior
         Subordinated Discount Notes Due 2006 owing to members of Iridium LLC
         or affiliates of such members.





                                  Schedule VI

<PAGE>   1
                                                                   EXHIBIT 10.16


                                                                  EXECUTION COPY



                         AGREEMENT REGARDING GUARANTEE


                 Agreement Regarding Guarantee, dated as of August 21, 1996
between Motorola, Inc., a Delaware corporation (the "Guarantor"), and Iridium
LLC, a Delaware limited liability company (the "Company").

                 1.   Bridge Financing Guarantee.  The Guarantor has
concurrently herewith entered into a Guarantee Agreement attached hereto as
Annex A (the "Bridge Agreement Guarantee") pursuant to which the Guarantor will
guarantee the payment of up to $750,000,000 of the obligations of the Company
under the Credit Agreement, dated as of August 21, 1996, between the Company
and the banks named therein (as such agreement exists when originally executed,
the "Bridge Agreement"), attached hereto as Annex B. The Company will provide
the Guarantor with written notice at least five full Business Days (and no more
than ten Business Days) prior to giving notice to the banks under the Bridge
Agreement of a proposed borrowing.  Capitalized terms used herein which are
defined in the Bridge Agreement shall have the meanings set forth in the Bridge
Agreement unless otherwise defined herein.

                 2.   Possible Takeout Financing Guarantee.  The Guarantor and
the Company acknowledge that the Company will seek to arrange for one or more
debt facilities to secure appropriate bank financing to complete the project
(which may include an extension of the Bridge Agreement) which will refinance
the Bridge Agreement (the "Takeout Financing Facility") and that any such
facilities will likely require guarantees or other credit support.  The
Guarantor has offered to provide a guarantee or other credit support for up to
$750 million of the Company's obligations under the Takeout Financing Facility
(the "Takeout Financing Facility Guarantee"), subject to the completion of
negotiations with the senior lenders under the Takeout Financing Facility
satisfactory to the Guarantor with respect to the amount and other terms and
conditions of the Takeout Financing Facility Guarantee and of the Takeout
Financing Facility.  Any agreement by Guarantor to extend the Takeout Financing
Facility Guarantee would be subject to the terms and conditions set forth in
Guarantor's Proposal to the Company, dated May 9, 1996 (revised), attached
hereto as Annex C (the "Proposal").
<PAGE>   2
                 3.  Reimbursement Obligation.

                 (a) Company Default.  Other than as set forth under Section
3(b) below, if and to the extent that the Lenders or the Administrative Agent
demand that the Guarantor pay, and the Guarantor does pay, any Bridge Agreement
Amount (as defined below) pursuant to the Bridge Agreement Guarantee (a "Bridge
Guarantee Payment"), the Company shall, promptly upon receipt from the
Guarantor of a written demand for reimbursement, reimburse the Guarantor for
such Bridge Guarantee Payment, plus interest accruing at a rate equal to that
which would be in effect under the Bridge Agreement, without duplication.
"Bridge Agreement Amount" means any amount due from the Company under the
Bridge Agreement or any Revolving Credit Note.

                 (b) Guarantor Default. If a Bridge Guarantee Payment relates
to a Bridge Agreement Amount that has been accelerated or otherwise become due
as a result of a Motorola-Based Default (as defined below), then (i) the
Guarantor shall assume and become subject to the obligations of the Lenders and
the Agents under the Bridge Agreement vis-a-vis the Company (including, without
limitation, the obligation to make Loans in the aggregate principal amount of
the Lenders' Commitments), (ii) the Guarantor shall assume and become entitled
to the benefits of the rights of the Lenders and the Agents under the Bridge
Agreement vis-a-vis the Company (including, without limitation, the right to
receive payments in respect of Loans made under the Bridge Agreement), but not
including any provisions relating to the Bridge Agreement Guarantee or the
occurrence of a Motorola Default (as defined in the Bridge Agreement), (iii)
the Company shall become obligated to reimburse the Guarantor for such Bridge
Guarantee Payment and to repay any additional amounts for which the Company may
become indebted to the Guarantor pursuant to clause (ii) above on the terms and
conditions contained in the Bridge Agreement as the Bridge Agreement is
modified by clause (ii) above, and (iv) the Company shall continue to be
subject to the terms and conditions of the Bridge Agreement (including, without
limitation, the covenants contained therein), as the Bridge Agreement is
modified by clause (ii) above.

                 (c)  Costs and Expenses.  The Company further agrees to
reimburse the Guarantor for all reasonable out-of-pocket costs and expenses
(including, without limitation, the fees and expenses of legal counsel) in
connection with any enforcement of the Company's obligations under Sections
3(a)(including, without limitation, any





                                     - 2 -
<PAGE>   3
fees and expenses incurred in connection with any bankruptcy proceedings).

                 4.   Compensation to Guarantor.  The Company shall compensate
the Guarantor for entering into the Bridge Agreement Guarantee and, subject to
the terms and conditions of Section 2 hereof and the terms and conditions of
the Proposal, any Takeout Financing Facility Guarantee by issuing warrants to
purchase Class 1 Interests in the Company("Shares") to the Guarantor in
substantially the form attached hereto as Annex D(the "Warrants").  On the 45th
day following the end of each quarter during which either the Bridge Agreement
Guarantee or the Takeout Financing Facility Guarantee (collectively, the
"Guarantees") remains outstanding or the Guarantor has made any payment under
either of the Guarantees, the Company shall issue a certificate to the
Guarantor evidencing the Warrants earned by the Guarantor in respect of the
Guarantee in such quarter.  The Guarantor shall earn Warrants based on the
Outstanding Guarantee Amount during any period according to the following
formula:

(A)              11,000 x [A x (B / 365)]

                 where "A" equals the Outstanding Guarantee Amount divided by
                 100,000,000 and "B" equals the number of days during which
                 Outstanding Guarantee Amount is at least $750,000,000, for
                 example, if the Guarantor guarantees  $750,000,000 of the
                 Company's obligations under the Bridge Agreement for a period
                 of one year, the Guarantor will have earned Warrants relating
                 to 82,500 Shares;

(B)              8,500 x [A x (C / 365)]

                 where "A" equals the Outstanding Guarantee Amount divided by
                 100,000,000 and "C" equals the number of days during which
                 Outstanding Guarantee Amount is less than $750,000,000 but at
                 least $500,000,000, for example, if the Guarantor guarantees
                 $500,000,000 of the Company's obligations under the Bridge
                 Agreement for a period of one year, the Guarantor will have
                 earned Warrants relating to 42,500 Shares; and

(C)              5,500 x [A x (D / 365)]

                 where "A" equals the Outstanding Guarantee Amount divided by
                 100,000,000 and "D" equals the number of days during which
                 Outstanding Guarantee Amount is any positive amount





                                     - 3 -
<PAGE>   4
                 less than $500,000,000, for example, if the Guarantor
                 guarantees  $250,000,000 of the Company's obligations under
                 the Bridge Agreement for a period of one year, the Guarantor
                 will have earned Warrants relating to 13,750 Shares.

Notwithstanding the foregoing, in no event shall the Warrants relate to more
than 150,000 Shares (subject to antidilution adjustments in accordance with the
terms of the Warrants and to recourse reduction milestones acceptable to the
Guarantor).  "Outstanding Guarantee Amount" means the amount of the Company's
obligations which the Guarantor has guaranteed (regardless of the actual amount
of the Company's obligations outstanding to the lender at any time during such
period) together, without duplication, with the amount the Guarantor has paid
pursuant to the Guarantees which has not been reimbursed by the Company
pursuant to this Agreement.

                 5.   Gateway Territory Incentives. The Company shall issue the
warrants earned by gateway owners pursuant to Section II.D. of the Proposal no
later than (i) in respect of the completion of each gateway owner's gateway
activities prior to the start of commercial service according to the commercial
activation plan ("Commercial Activation"), 30 days after Commercial Activation
and (ii) in respect of service revenue generated by each gateway owner, 17
months after Commercial Activation.

                 6.   Asset Drop Down.  The Guarantor consents and agrees that
the Company may establish a limited liability company Subsidiary at least
ninety-nine percent of the equity of which would be owned by the Company
("Iridium Sub") and transfer to Iridium Sub all or substantially all of the
assets of the Company (the "Asset Drop Down"); provided the Iridium Sub shall
assume in writing certain of the Company's obligations under this Agreement and
the Security Agreement, with the Company remaining subject to the remainder of
such obligations, all on terms and conditions mutually agreeable to the Company
and the Guarantor.

                 7.   Amendments to SSC, TNDC and O&M Contract; Letter
Agreement.  The Company represents and warrants that it has duly authorized,
executed and delivered (a) Amendment No. 6 dated August 16, 1996, to the Space
System Contract effective July 29, 1993 (the "SSC"), between the Company and
the Guarantor, in the form attached hereto as Annex E, (b) Amendment No. 2,
dated August 16, 1996, to the Terrestrial Network Development Contract
effective January 1, 1993 (the "TNDC") between the Company and the Guarantor,
in the





                                     - 4 -
<PAGE>   5
form attached hereto as Annex F, (c) Amendment No. 6 dated August 16, 1996, to
the Operations and Maintenance Contract effective July 29, 1993 (the "O&M
Contract"), between the Company and the Guarantor, in the form attached hereto
as Annex G and (d) that certain Letter Agreement with the Guarantor, in the
form attached hereto as Annex H, with respect to the FCC license to build and
operate the Iridium system.

                 8.   Authorization of Capital Call.  The Company represents
and warrants that Section 4.02 of the Limited Liability Company Agreement of
the Company is in full force and effect and the Company acknowledges that it is
obligated to call for additional capital on the terms and subject to the
conditions expressly stated therein.

                 9.   Security Agreement.  The Company shall enter into a
Security Agreement, in the form attached hereto as Annex I, granting the
Guarantor a security interest in the Collateral (as defined therein).

                 10.  Additional Company Representations and Warranties. The
Company represents and warrants that

                 (a)  the representations and warranties of the Company set
         forth in Section 7 of the Bridge Agreement are true and correct as of
         the date given under the Bridge Agreement;

                 (b)  the Certificates of Designation relating to the Company's
         Series B Class 2 Interests and Series C Class 2 Interests have been
         duly adopted by the Company's Banking and Financing Committee in the
         form attached hereto as Annex J and all other necessary corporate
         actions have been taken to duly authorize the issuance to the
         Guarantor of the Series B Class 2 Interests and Series C Class 2
         Interests;

                 (c)  The execution, delivery and performance of this
         Agreement, the Warrants, the amendments and waiver letter contemplated
         by Section 5 hereof and all other agreements contemplated hereby to
         which the Company is a party, have been duly authorized by the
         Company.  This Agreement, the Warrants, such amendments, such waiver
         letter and the Certificates of Designation relating to the Company's
         Series B Class 2 Interests and Series C Class 2 Interests and all
         other agreements contemplated hereby to which the Company is a party
         each constitutes a valid and binding obligation of the Company,
         enforceable in accordance with its terms.  The





                                     - 5 -
<PAGE>   6
         execution and delivery by the Company of this Agreement, the Warrants,
         such amendments, such waiver letter and all other agreements
         contemplated hereby to which the Company is a party, the offering,
         sale and issuance of the Company's Series B Class 2 Interests and
         Series C Class 2 Interests and the Warrants hereunder, the issuance of
         the Company's Class 1 Interests upon exercise of Warrants and the
         fulfillment of and compliance with the respective terms hereof and
         thereof by the Company, do not and shall not (i) conflict with or
         result in a breach of the terms, conditions or provisions of, (ii)
         constitute a default under, (iii) , except as provided in the Security
         Agreement, result in the creation of any lien, security interest,
         charge or encumbrance upon the Company's or any Subsidiary's equity
         capital or assets pursuant to, (iv) give any third party the right to
         modify, terminate or accelerate any obligation under, (v) result in a
         violation of, or (vi) require any authorization, consent, approval,
         exemption or other action by or notice or declaration to, or filing
         with, any court or administrative or governmental body or agency
         pursuant to, the charter, limited liability company agreement or
         bylaws of the Company or any Subsidiary, or any law, statute, rule or
         regulation to which the Company or any Subsidiary is subject, or any
         agreement, instrument, order, judgment or decree to which the Company
         or any Subsidiary is subject.

                 11.  Guarantor Protection Rights.  So long as Guarantor's
guarantee of any amount of the Company's debt, under the Bridge Agreement
Guarantee, is in effect the Company shall not without the prior written
approval of Guarantor (which may be withheld in the absolute discretion of
Guarantor):

                 (a)  subject to the terms of Section 6, sell, lease or
                      otherwise dispose of, or permit any Subsidiary to sell,
                      lease or otherwise dispose of, more than 5% of the
                      consolidated assets of the Company and its Subsidiaries
                      (computed on the basis of book value, determined in
                      accordance with generally accepted accounting principles
                      consistently applied, or fair market value, determined by
                      the Company's board of directors in its reasonable good
                      faith judgment) in any transaction or series of related
                      transactions or sell or permanently dispose of any of its
                      or any Subsidiary's Intellectual Property Rights (other
                      than commercially available software designed for





                                     - 6 -
<PAGE>   7
                      operation on a personal computer or network of personal
                      computers);

                 (b)  merge or consolidate with any Person or permit any
                      Subsidiary to merge or consolidate with any Person (other
                      than a Wholly-Owned Subsidiary);

                 (c)  liquidate, dissolve or effect a recapitalization or
                      reorganization of the Company's capital structure in any
                      form of transaction;

                 (d)  effect a change in the equity capitalization of the
                      Company that requires the approval of the holders of
                      Shares other than in connection with an initial public
                      offering of the Company's equity securities;

                 (e)  directly or indirectly declare or pay any dividends or
                      make any distributions upon any of its equity capital
                      other than distributions to members made pursuant to
                      Section 3.07(a) of the LLC Agreement with respect to
                      certain members' U.S. tax liabilities;

                 (f)  directly or indirectly redeem (other than a redemption of
                      the Series B or C, Class 2 interests of the Company
                      pursuant to the LLC Agreement), purchase or otherwise
                      acquire, or permit any Subsidiary to redeem, purchase or
                      otherwise acquire, any of the Company's or any
                      Subsidiary's capital stock or other equity securities
                      (including, without limitation, warrants, options and
                      other rights to acquire such capital stock or other
                      equity securities) other than pursuant to the exercise of
                      the Company's remedies against any holder of Shares
                      pursuant to the terms of the LLC Agreement or the 1993
                      Stock Purchase Agreement (as defined in the LLC
                      Agreement);

                 (g)  incur any indebtedness for borrowed money other than
                      indebtedness the amount, terms and conditions (including
                      without limitations, the subordination provisions) of
                      which have been approved in advance by the lenders to the
                      extent required under the Bridge Agreement; or





                                     - 7 -
<PAGE>   8
                 (h)  take any action or permit any circumstances to exist
                      which is prohibited under the terms of the Bridge
                      Agreement or fail to take any action required to be taken
                      by it under the terms of the Bridge Agreement, in each
                      case subject to the grace period applicable to any
                      default created by such action or circumstance pursuant
                      to Section 9 of the Bridge Agreement; provided, however,
                      that this clause (h) shall not apply to any action or
                      circumstance which would constitute a Motorola Default
                      (as defined in the Bridge Agreement).

                 12.  Amendments and Modifications to Bridge Agreement. The
Company shall not enter into any amendment, waiver, supplement or modification
of the Bridge Agreement without the prior written consent of the Guarantor,
which consent may be granted or withheld by the Guarantor in its sole
discretion, but acting in good faith.

                 13.  Referral of Matters to Related Party Contracts Committee.
The Company acknowledges and agrees that the Contract Committee (as defined in
the LLC Agreement) of the Company's board of directors has a limited scope of
authority with respect to the relationship between Guarantor and the Company,
and that only those matters specifically required by the LLC Agreement and
matters related to the Guarantee, other contracts between the Guarantor and the
Company and actions or claims by the Company against the Guarantor will be
taken to the Contract Committee for approval.

                 14.  Use of Proceeds. The Company will use the proceeds of the
Loans solely (i) to make payments to the Guarantor at the times and in the
amounts required pursuant to the SSC or TNDC, (ii) to pay fees and expenses
payable to the Global Arrangers, the Agents and the Lenders in connection with
the Bridge Agreement and (iii) for general corporate purposes so long as the
amount subject to this clause (iii) does not exceed the amounts budgeted for
such purposes in the budget plans approved by the Company's board of directors
from time to time.

                 15.  Network Implementation; Review Procedures.  The Company
agrees to use its best efforts to comply with Part I, Section IV of the
Proposal relating to network implementation and review procedures.

                 16.  Copies of Information and Notices. Any and all
information, notices and correspondence provided by or on behalf of the Company
or Iridium Sub to the Global Arrangers, the





                                     - 8 -
<PAGE>   9
Administrative Agent or any Lender or by or on behalf of the Global Arrangers,
the Administrative Agent or any Lender to the Company or Iridium Sub (in each
case whether or not required under the Bridge Agreement) shall be provided at
the same time to the Guarantor.

                 17.  Access.  The Company shall permit the Guarantor to have
access to relevant meetings, documents or other materials, other than Internal
Meetings, Documents and Materials (as defined below), directly relating to the
Guarantee, the Bridge Agreement, the Takeout Facility Guarantee or the Takeout
Financing Facility. "Internal Meetings, Documents and Materials" means meetings
between or among executives or employees of the Company or between or among the
Company and its consultants, advisors and/or counsel; documents or other
materials which are prepared in connection with such meetings; and documents or
other materials which are circulated solely between or among executives or
employees of the Company or between or among the Company and its consultants,
advisors and/or counsel.

                 18.  Notices under this Agreement. All notices, requests,
demands, claims, and other communications hereunder will be in writing.  Any
notice, request, demand, claim, or other communication hereunder shall be
deemed duly given (i) when delivered, if personally delivered, (ii) when
receipt is electronically confirmed, if faxed (with hard copy to follow via
first class mail, postage prepaid) or (iii) one day after deposit with a
reputable overnight courier, in each case addressed to the intended recipient
as set forth below:

If to the Company:

Iridium, LLC
1401 H Street, NW
Washington, D.C. 20005
Attention: Vice President and Chief Financial Officer
           and Vice President - General Counsel
Telecopy #: (202)842-0006

If to the Guarantor:

Motorola, Inc.
1303 East Algonquin Road
Schaumburg, Illinois 60196
Attention: Treasurer
Telecopy #: (847)576-4768





                                     - 9 -
<PAGE>   10
with a copy (which shall not constitute notice) to:

Motorola, Inc.
425 North Martingale Road
Schaumburg, Illinois 60173
Attention: Vice President - Law Department, Iridium Matters
Telecopy #: (847)435-3328

                 19.  Definitions. The following terms when used in this
Agreement have the following meanings.

                 "Intellectual Property Rights" means all (i) patents, patent
         applications, patent disclosures and inventions, (ii) trademarks,
         service marks, trade dress, trade names, logos and corporate names and
         registrations and applications for registration thereof together with
         all of the goodwill associated therewith, (iii) copyrights (registered
         or unregistered) and copyrightable works and registrations and
         applications for registration thereof, (iv) mask works and
         registrations and applications for registration thereof, (v) computer
         software, data, data bases and documentation thereof, (vi) trade
         secrets and other confidential information (including, without
         limitation, ideas, formulas, compositions, inventions (whether
         patentable or unpatentable and whether or not reduced to practice),
         know-how, manufacturing and production processes and techniques,
         research and development information, drawings, specifications,
         designs, plans, proposals, technical data, copyrightable works,
         financial and marketing plans and customer and supplier lists and
         information), (vii) other intellectual property rights and (viii)
         copies and tangible embodiments thereof (in whatever form or medium).

                 "LLC Agreement" means the Limited Liability Company Agreement
         of Iridium LLC dated as of July 19, 1996.

                 "Motorola-Based Default" means (i) a Motorola Default as
         defined in the Bridge Agreement other than

                 (A) a Motorola Default occurring as the result of the
                 ownership percentage of the Guarantor and its affiliates
                 falling below the thresholds set forth in Section 9(n) of the
                 Bridge Agreement unless it falls below such thresholds as the
                 result of the Guarantor or





                                     - 10 -
<PAGE>   11
                 an affiliate disposing of the Company's voting securities; and

                 (B) any Motorola Default in existence on or prior to a date on
                 which the Company provides a notice of borrowing to the
                 Lenders pursuant to Section 4.05 of the Bridge Agreement if
                 the Company fails to provide prior notice to the Guarantor of
                 such borrowing in the manner prescribed in Section 1 hereof,
                 and

         (ii) a demand for payment under the Bridge Agreement Guarantee which
         has arisen as a result of a material default by the Guarantor under

                 (1) the SSC, the TNDC or the O&M Contract, so long as the
                 Company has fully complied in all material respects with its
                 obligations under the SSC, the TNDC and the O&M Contract and
                 the Guarantor's default is the primary cause for the default
                 under the Bridge Agreement which has caused such demand for
                 payment or

                 (2) under any gateway purchase agreement between Guarantor and
                 a gateway purchaser, so long as the default by the Guarantor
                 thereunder was not excused or caused by any default on the
                 part of the purchaser thereunder.

                 "Person" means an individual, a partnership, a corporation, a
         limited liability company, an association, a joint stock company, a
         trust, a joint venture, an unincorporated organization and a
         governmental entity or any department, agency or political subdivision
         thereof.

                 "Subsidiary" means, with respect to any Person, any
         corporation, limited liability company, partnership, association or
         other business entity of which (i) if a corporation, a majority of the
         total voting power of shares of stock entitled (without regard to the
         occurrence of any contingency) to vote in the election of directors,
         managers or trustees thereof is at the time owned or controlled,
         directly or indirectly, by that Person or one or more of the other
         Subsidiaries of that Person or a combination thereof, or (ii) if a
         limited liability company, partnership, association 





                                     - 11 -
<PAGE>   12
         or other business entity, a majority of the partnership or other 
         similar ownership interest thereof is at the time owned or controlled, 
         directly or indirectly, by any Person or one or more Subsidiaries of 
         that Person or a combination thereof.  For purposes hereof, a Person 
         or Persons shall be deemed to have a majority ownership interest in a 
         limited liability company, partnership, association or other business 
         entity if such Person or Persons shall be allocated a majority of 
         limited liability company, partnership, association or other business 
         entity gains or losses or shall be or control any managing director 
         or general partner of such limited liability company, partnership, 
         association or other business entity.

                 20.  Complete Agreement.  This Agreement embodies the complete
agreement and understanding among the parties with respect to the matters
addressed herein and supersedes and preempts any prior understandings,
agreements or representations by or among the parties, written or oral, which
may have related to the subject matter hereof in any way.

                 21.  Miscellaneous.  This Agreement Regarding Guarantee (a) is
made under and shall be governed by the laws of the State of New York without
regard to principles of conflict of laws, (b) is intended for the benefit of
the parties hereto and is not intended to benefit any other person and no
person other than the parties hereto may rely upon the provisions hereof, (c)
may be executed in counterparts, each of which taken together shall constitute
one and the same instrument, and (d) may be amended or waived only if such
amendment or waiver is in writing and signed by the party against whom it is
sought to be enforced.

                           *     *     *     *     *





                                     - 12 -
<PAGE>   13
                                                                  EXHIBIT 10.16

                 IN WITNESS WHEREOF, the parties have entered into this
Agreement Regarding Guarantee in each case as of the date first above written.

                             IRIDIUM LLC
                          
                          
                             By:      /s/ PAUL DAVERIO
                                      --------------------------------
                                      Name: Paul Daverio
                                      Title: Chief Financial Officer
                          
                          
                          
                             MOTOROLA, INC.
                          
                          
                             By:      /s/ GARTH L. MILNE
                                      --------------------------------
                                      Name: Garth L. Milne
                                      Title: Senior Vice President
                                             and Treasurer




                                     - 13 -
<PAGE>   14
                                List of Annexes


Annex A    -     Bridge Agreement Guarantee
Annex B    -     Bridge Agreement
Annex C    -     Proposal
Annex D    -     Form of Warrant
Annex E    -     Amendment to SSC
Annex F    -     Amendment to TNDC
Annex G    -     Amendment to O&M Contract
Annex H    -     Letter Agreement
Annex I    -     Security Agreement
Annex J    -     Certificates of Designation





                                     - 14 -

<PAGE>   1
                                                                 Exhibit 23.1

                             Accountants' Consent


The Boards of Directors, Members and Stockholders
Iridium LLC and Iridium World Communications Ltd.:

We consent to the use of our reports included herein and to the references to
our firm under the headings "Selected Financial Data" and "Experts" in the
prospectus.






                                         /s/ KPMG PEAT MARWICK LLP
                                         -------------------------
                                             KPMG Peat Marwick LLP

Washington, D.C.
April 17, 1997


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