WHITTAKER CORP
8-K, 1998-05-08
MISCELLANEOUS FABRICATED METAL PRODUCTS
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<PAGE>
 
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 8-K



                            CURRENT REPORT PURSUANT
                         TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934



          Date of report (Date of earliest event reported) MAY 4, 1998



                             WHITTAKER CORPORATION
             (Exact Name of Registrant as Specified in Its Charter)



                                    DELAWARE
                 (State or Other Jurisdiction of Incorporation)



        0-20609                                        95-4033076
  (Commission File Number)                (I.R.S. Employer Identification No.)



                 1955 N. SURVEYOR AVENUE, SIMI VALLEY, CA 93063
                    (Address of Principal Executive Offices)



                                 (805) 526-5700
              (Registrant's Telephone Number, Including Area Code)
<PAGE>
 
ITEM 5.  OTHER EVENTS

     The Company and Hughes Electronics Corporation ("Hughes") have entered into
a Second Amendment to Stock Purchase Agreement, dated as of May 4, 1998 (the
"Amendment"), to modify certain terms of the Company's 1995 purchase of Hughes
LAN Systems, Inc. (now known as Whittaker Communications, Inc. ("WCI")) from
Hughes.

     Under the Stock Purchase Agreement between the Company and Hughes, dated
April 24, 1995 (the "Prior Agreement"), the Company issued to Hughes a 7%
convertible subordinated note in the principal amount of $15 million, due May 1,
2005 (the "Note").  At Hughes' election, the principal amount of the Note was
convertible into shares of the Company's Common Stock ("Whittaker Common Stock")
at $24.25 per share (the "Conversion Price").  Under the Prior Agreement, the
Company also agreed, until October 31, 1999, to make payments to Hughes based
upon sales of products utilizing Enterprise Hub technology ("Contingent
Payments"), and, upon the occurrence of specified change-in-control events, to
pay a total of $17,500,000 less any Contingent Payments paid to Hughes prior to
the date of the first to occur of such events (the "Mandatory Payment").  Under
the terms of the Company's credit agreement, the Company is prohibited from
making Contingent Payments so long as the Company's Fixed Charge Coverage Ratio
(as defined in the credit agreement) is less than 1.50 to 1.00.  As a result of
failing to maintain a Fixed Charge Coverage Ratio in excess of 1.50 to 1.00, the
Company has been prohibited from paying Contingent Payments that have accrued
since April 30, 1996.  In addition, the Company has accrued interest on past due
Contingent Payments.

     The Amendment provides that Whittaker may elect to pay the unpaid
Contingent Payments and accrued interest in cash or in shares of Whittaker
Common Stock.  In accordance with the terms of the Amendment, the Company has
elected to pay to Hughes the unpaid Contingent Payments and accrued interest in
107,841 newly issued shares of Whittaker Common Stock.  The Second Amendment
also provides that no further Contingent Payments and no Mandatory Payments
shall be payable by the Company.  The Company and Hughes have also agreed in the
Amendment to release any and all existing claims against each other.

     The Amendment modifies the Note by (a) changing the Conversion Price from
$24.25 per share to $16.97 per share; and (b) if the Company redeems all or a
portion of the Note prior to May 4, 2002, obligating Whittaker to issue to
Hughes a warrant to purchase the number of shares of Whittaker Common Stock
which Hughes could have received upon conversion of the principal amount so
redeemed by the Company ("Warrant").  The form of Warrant states that the
exercise price of the Warrant will be based on the Conversion Price of $16.97
and adjusted in accordance with customary anti-dilutive protections similar to
those affecting the conversion of the Note.  The form of Warrant also provides
that number of shares subject to the Warrant will be adjusted based upon similar
anti-dilutive principles.  If the entire principal amount of the Note was
converted as of the date of the Amendment into Whittaker Common Stock, the
Company would be required (under the Amendment and the Note, as amended) to
issue, and has thus reserved for issuance, 883,912 shares of Whittaker Common
Stock.

                                       2
<PAGE>
 
ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS

(C)  EXHIBITS

     Exhibit No.    Description
     -----------    -----------

     10.1           Second Amendment to Stock Purchase Agreement, dated May 4,
                    1998, between Whittaker Corporation and Hughes Electronics
                    Corporation.

     10.2           Allonge No. 1, dated May 4, 1998, by Whittaker Corporation.



                                   SIGNATURES


     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                         WHITTAKER CORPORATION



                          By: /s/ Lynne M. O. Brickner
                              ---------------------------------------
                              Lynne M. O. Brickner
                                Vice President, Secretary and General Counsel
 



Dated:  May 7, 1998

                                       3
<PAGE>
 
                                 EXHIBIT INDEX
                                 -------------



                                                                   Sequential
Exhibit No.    Description                                          Page No.
- -----------    -----------                                          --------

10.1           Second Amendment to Stock Purchase Agreement, 
               dated May 4, 1998, between Whittaker Corporation 
               and Hughes Electronics Corporation.

10.2           Allonge No. 1, dated May 4, 1998, by Whittaker
               Corporation.

                                       4

<PAGE>
 
                                                                    EXHIBIT 10.1

                               SECOND AMENDMENT
                                      TO
                           STOCK PURCHASE AGREEMENT


This Second Amendment to Stock Purchase Agreement, dated and effective as of May
4, 1998 ("Second Amendment"), is made and entered into by and between Hughes 
Electronics Corporation, a Delaware corporation ("Hughes") for itself and as 
assignee of Hughes Aircraft Company, a Delaware corporation ("HAC"), and 
Whittaker Corporation, a Delaware corporation ("Whittaker"), with reference to 
the following facts:

A.  HAC and Whittaker entered into a Stock Purchase Agreement dated March 23,
    1995 (the "Stock Purchase Agreement"), as amended April 24, 1995 (the "First
    Amendment," collectively with the Stock Purchase Agreement, the
    "Agreement"), by which Whittaker purchased from HAC all of the outstanding
    capital stock of Hughes LAN Systems, Inc., a California corporation (now
    known as Whittaker Communications, Inc. ("WCI")).

B.  As partial consideration for the purchase of WCI, Whittaker agreed to (i)
    deliver the Note (as defined in the Stock Purchase Agreement), and (ii) make
    Contingent Payments (as defined in the Stock Purchase Agreement) to HAC. By
    the First Amendment, (x) HAC, among other things, assigned all of its right,
    title and interest in the Note and the Contingent Payments to its sole
    stockholder. Hughes: (y) Whittaker agreed to such assignment and to issue
    the Note to Hughes and further agreed that all references to HAC in Exhibit
    1.3(c) and Section 4.4 of the Stock Purchase Agreement shall refer to
    Hughes: and (z) Hughes accepted and affirmed the representations of HAC in
    Section 3.23 of the Stock Purchase Agreement.

C.  Upon the closing of the sale by HAC on April 24, 1995, Whittaker and Hughes
    entered into the Registration Agreement, Whittaker issued the Note to Hughes
    and all references to "HAC" in Exhibit 1.3(c) and Section 4.4 of the
    Agreement were amended to mean "Hughes".

D.  Under the terms of its Amended and Restated Credit Agreement, dated as of
    April 10, 1996 and as amended to date, among Whittaker, NationsBank of
    Texas, N.A., as agent and lender, and the financial institutions party
    thereto, Whittaker has been restricted from paying to Hughes the Contingent
    Payments that have accrued since April 28, 1996. As of the date of this
    Agreement, the aggregate amount of Contingent Payments, plus interest
    thereon, which are accrued and unpaid, as mutually agreed by the parties, is
    $1,432,565 (the "Unpaid Contingent Payment").

E.  Whittaker has asserted various claims against HAC for, among other things,
    (i) an adjustment in the Cash Payment under Section 1.6 of the Agreement due
    to an alleged reduction in Working Capital below the Base Amount, and (ii)
    various alleged breaches of representations and warranties, general claims
    of misrepresentation or other claims for indemnification under Article XII
    of the Agreement or otherwise under applicable law (all such claims which
    have been asserted by Whittaker, or which could have been

                                       1
<PAGE>
 
     asserted by Whittaker, at or prior to the Effective Date are referred 
     to herein as the "Outstanding Whittaker Claims").

F.   Each of Hughes and HAC has contested the validity of the Outstanding
     Whittaker Claims and each has denied any liability or obligation to
     Whittaker with respect to any such Outstanding Whittaker Claims.

G.   Hughes has claimed that, by virtue of certain transactions effected by
     Whittaker, the amounts specified in Section 2.2 of Exhibit 1.3 (c) to
     the Agreement (the "Mandatory Payment"), plus interest thereon, is owing to
     Hughes (the "Outstanding Hughes Claims").

H.   Whittaker has contested the validity of the Outstanding Hughes Claims and
     has denied any liability or obligation to Hughes with respect to such
     Outstanding Hughes Claims.

I.   Each of Hughes and Whittaker now seeks to modify and amend the Agreement
     and the Note and to release each other from all claims, whether known or
     unknown, arising from or in connection with the Agreement and the sale
     of WCI by HAC, except as otherwise provided in this Second Amendment.

NOW THEREFORE, in consideration of the mutual promises contained herein, the 
parties agree as follows:

1.   Definitions.
     ------------

     "Effective Date" shall mean the date of this Second Amendment.

     "Whittaker Common Stock" shall mean the common stock, $.01 par value, of 
     Whittaker.

     Except as otherwise expressly defined herein, all capitalized terms used in
     this Second Amendment shall have the same meaning as defined in the
     Agreement.

2.   Representations and Warranties
     ------------------------------

     2.1  Representations of Hughes
          -------------------------

          Hughes represents and warrants to Whittaker as follows:

          (a) This Second Amendment and the agreements executed in connection
              herewith, and the transactions contemplated hereby and thereby,
              have been duly authorized by the Executive Committee of Hughes,
              and this Second Amendment and such related agreements are valid
              and binding obligations of Hughes, enforceable against Hughes in
              accordance with the terms hereof and thereof, except as may be
              limited by bankruptcy, insolvency, moratorium or other laws
              affecting creditors' rights generally and subject to general
              principles of equity.

                                       2
<PAGE>  
 
          (b)     Under the Master Separation Agreement dated as of December 16,
                  1997 by and among General Motors Corporation ("GM"), HE
                  Holdings, Inc., formerly named "Hughes Aircraft Company"
                  ("HAC"), Delco Electronics Corporation and Hughes Electronics
                  Corporation, a Delaware corporation formerly named Hughes
                  Network Systems, Inc., and the related Assignment, Capital
                  Contribution and Assumption Agreement between HAC and Hughes
                  dated as of December 16, 1997, or otherwise in connection with
                  the transactions referred to in such agreement, Hughes has
                  been assigned, and has assumed, all rights and obligations of
                  the entity formerly named "Hughes Electronics Corporation" and
                  of the entity formerly named "Hughes Aircraft Company" under
                  the Agreement, the Note and the Registration Agreement,
                  including any rights or obligations released by this Second
                  Amendment. Without limiting the generality of the foregoing,
                  Hughes is the sole owner of the Outstanding Hughes Claims and
                  has not assigned or otherwise transferred any of such
                  Outstanding Hughes Claims. Hughes has the legal right to
                  execute this Second Amendment, as successor to, or assignee
                  of, the entities formerly known as "Hughes Electronics
                  Corporation" or "Hughes Aircraft Company."

          (c)     If the Shares are issued to Hughes in accordance with Section
                  3(a) of this Second Amendment, Hughes will acquire such Shares
                  for its own account for investment, not as a nominee or agent,
                  and not with a view to the resale or distribution of such
                  Shares or any part thereof or participation therein except
                  pursuant to the Registration Statement provided for in Section
                  3(b).

2.2       REPRESENTATIONS OF WHITTAKER
          ----------------------------

          Whittaker represents and warrants to Hughes as follows:

          (a)     This Second Amendment and the agreements executed in
                  connection herewith, and the transactions contemplated hereby
                  and thereby, have been duly authorized by the Board of
                  Directors of Whittaker, and this Second Amendment and such
                  related agreements are valid and binding obligations of
                  Whittaker, enforceable against Whittaker in accordance with
                  the terms hereof and thereof, except as may be limited by
                  bankruptcy, insolvency, moratorium or other laws affecting
                  creditors' rights generally and subject to general principles
                  of equity.

          (b)     Whittaker is the sole owner of the Outstanding Whittaker
                  Claims and has not assigned or otherwise transferred any of
                  such Outstanding Whittaker Claims.

          (c)     The Note, as amended by Allonge No. 1 thereto ("Amended
                  Note"), is duly authorized and validly issued and the
                  requisite number of shares of

                                       3
<PAGE>
 
               Whittaker Common Stock have been reserved for issuance upon
               conversion of the Amended Note, and upon conversion of all or
               part of the Amended Note into Whittaker Common Stock in
               accordance with the Amended Note, or upon issuance of the
               Warrants in accordance with the Amended Note, if such conversion
               or issuance occurs, the shares of Whittaker Common Stock, or
               Warrants therefor, as applicable, issued to Hughes will be duly
               authorized, validly issued, fully paid and nonassessable and will
               be free of preemptive or other rights.

          (d)  If the Shares are issued pursuant to Section 3(a) of this Second
               Amendment, they will be duly authorized, validly issued, fully
               paid and nonassessable and will be free of preemptive or other
               similar rights.

       2.3   Indemnification. The representations and warranties in this Section
             ---------------
             2 shall be considered representations or warranties of the parties
             under the Agreement, for purposes of Article XII of the Agreement.

3.  Contingent Payment.
    ------------------

    (a)  Upon execution and delivery of this Second Amendment, the Unpaid
         Contingent Payment shall be paid to Hughes by Whittaker at Whittaker's
         option (i) in cash equal to the Unpaid Contingent Payment or (ii) as
         described in the following sentence, in shares of Whittaker Common
         Stock with a value equal to 111.11% of the dollar amount of the Unpaid
         Contingent Payment. If Whittaker elects to pay the Unpaid Contingent
         Payment in shares, the number of shares of Whittaker Common Stock which
         shall be issued to Hughes shall be equal to 111.11% of the dollar
         amount of the Unpaid Contingent Payment divided by $14.76 (such shares,
         if issued, are referred to herein as the "Shares").

    (b)  If Whittaker elects to pay the Unpaid Contingent Payment in Shares,
         Whittaker will (i) deliver to Hughes within 15 business days of the
         Effective Date, a certificate for the Shares and (ii) prepare and file
         with the SEC, within 30 days after the Effective Date, a registration
         statement on Form S-3 covering all the Shares issued to Hughes (the
         "Registration Statement"). The Shares shall be considered "Registrable
         Securities" for purposes of the Registration Agreement and the
         Registration Statement shall be considered a "Demand Registration"
         under the Registration Agreement; provided, however, that Hughes shall
         continue to be entitled to deliver one additional Demand Notice (as
         defined in the Registration Agreement) with respect to any other
         Registrable Securities (in additional to the Shares) which it may
         hereafter acquire. The parties also agree that any shares of Whittaker
         Common Stock or other security which may be issued upon exercise of the
         Warrants (if issued pursuant to the Note) shall be considered
         "Registrable Securities" under the Registration Agreement.

    (c)  From and after the Effective Date, no further Contingent Payments,
         Mandatory Payments, or any other amounts otherwise required to be paid
         under Exhibit 1.3(c) of the Agreement shall be payable by Whittaker,
         and Exhibit 1.3(c) to the Agreement shall be void and of no further
         effect.

                                       4
<PAGE>
 
4.  Amendments to Agreement.
    -----------------------

    (a)  From and after the Effective Date, Sections 1.3, 8.9 and 12.8 of the 
         Agreement shall be deleted and shall be void and of no further effect.

    (b)  Whittaker acknowledges and consents to the transactions referred to in
         Section 2.1(b) of this Second Amendment. All references to Hughes in
         the Agreement or any Related Document shall mean Hughes Electronics
         Corporation, the party to this Second Amendment.

    (c)  Sections 12.1(a) and (b) of the Agreement are amended to read as 
         follows:

         "(a) any third party claim which arises out of or relates to any
              inaccuracy or misrepresentation in or breach of any representation
              or warranty of Hughes in the Second Amendment or in Sections 3.2,
              3.4, 3.6, 3.7(b), (c), (d) or (e), the first sentence of Section
              3.8(a) or Sections 3.12(b), 3.16 or 3.23 of the Agreement.

          (b) the breach or failure by Hughes to perform after the Effective
              Date any of its covenants or agreements under the Agreement, as
              amended, or any of the Related Documents;"

    (d)  Sections 12.2(a) and (b) of the Agreement are amended to read as 
         follows:

         "(a) any third party claim which arises out of or relates to any
              inaccuracy or misrepresentation in or breach of any representation
              or warranty of Whittaker in the Agreement, as amended;

          (b) the breach or failure by Whittaker to perform after the Effective
              Date any of its covenants or agreements under the Agreement, as
              amended, or any of the Related Documents;"

    (e)  Section 13.2 of the Agreement is amended to provide that the respective
         addresses for notices under the Agreement shall be as follows:


    If to Hughes:    Hughes Electronics Corporation
                     200 N. Sepulveda
                     Bldg. 001, MS A126
                     El Segundo, CA 90245
                     Attention: P. T. Doyle,
                     Vice President - Corporate Development
                     Fax No. (310) 640-0433 

                                       5
<PAGE>
 
     If to Whittaker:    Whittaker Corporation
                         1995 N. Surveyor Avenue
                         Simi Valley, CA 93063
                         Attention: J.K. Otto, Vice President
                         CFO & Treasurer
                         Fax No. (805) 584-4148

5.  Amendment to Note.  From and after the Effective Date, the Note shall be 
    -----------------
    amended as set forth in the Allonge No. 1 attached hereto as Exhibit 1 and 
    incorporated herein by this reference.

6.  Mutual Release.
    --------------

    (a)  Hughes and its successors and assigns, hereby release (on behalf of
         itself, HE, GM and HAC), acquit and forever discharge Whittaker and its
         successors, assigns, affiliates, subsidiaries, stockholders, directors,
         officers, employees, attorneys, consultants, representatives and agents
         from any and all manner of actions or causes of action (in law or in
         equity), debts, liens, contracts, agreements, promises, liabilities,
         obligations, claims (including without limitation, the Outstanding
         Hughes Claims), rights, demands, damages, losses, costs or expenses of
         any nature whatsoever, known or unknown, fixed or contingent, which
         they now have or may hereafter have against Whittaker and its
         successors, assigns, affiliates, subsidiaries, stockholders, directors,
         officers, employees, attorneys, consultants, representatives, and
         agents by reason of any matter, event, action, cause, or thing arising
         out of, based upon or relating in any way to the Agreement or the
         transactions contemplated therein which arose or have arisen prior to
         the Effective Date; provided, however that the foregoing release shall
         not apply to (i) this Second Amendment; or (ii) the Note, as amended
         hereby, or (iii) the Registration Agreement; or (iv) claims for
         indemnification pursuant to Article XII of the Agreement, as amended by
         this Second Amendment, that are based on third party claims against
         Hughes that are unknown to Hughes as of the Effective Date.

    (b)  Whittaker and its successors and assigns, hereby release, acquit and
         forever discharge Hughes (including for these purpose, HAC, GM and HE),
         and its successors, assigns, affiliates, subsidiaries, stockholders,
         directors, officers, employees, attorneys, consultants,
         representatives, and agents from any and all manner of action or causes
         of action (in law or equity), debts, liens, contracts, agreements,
         promises, liabilities, obligations, claims (including, without
         limitation, the Outstanding Whittaker Claims), rights, demands,
         damages, losses, costs or expenses of any nature whatsoever, known or
         unknown, fixed or contingent, which it now has or may hereafter have
         against Hughes and its successors, assigns, affiliates, subsidiaries,
         stockholders, directors, officers, employees, attorneys, consultants,
         representatives and agents by reason of any matter, event,

                                       6
<PAGE>
 
          action, cause or thing arising out of, based upon or relating to the
          Agreement or the transactions contemplated therein which arose or have
          arisen prior to the Effective Date; provided, however, that the
          foregoing release shall not apply to (i) this Second Amendment, or
          (ii) the Note, as amended hereby, or (iii) the Registration Agreement,
          or (iv) claims for indemnification pursuant to Article XII of the
          Agreement, as amended by this Second Amendment, that are based on
          third party claims against Whittaker that are unknown to Whittaker as
          of the Effective Date.

     (c)  It is hereby expressly understood that Section 1542 of the California
          Civil Code ("Section 1542") provides as follows:


A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR 
SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF 
KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT WITH THE DEBTOR.

Hughes, on one hand, and Whittaker, on the other hand, expressly waive and 
relinquish to the full extent that they may lawfully do so, all rights and 
benefits they have or may have under Section 1542 and/or the provisions of all 
comparable, equivalent or similar statutes and principles of common law of 
California. The parties to this Second Amendment further acknowledge and agree 
that this waiver is an essential and material term of this Second Amendment. In 
connection with said waiver and relinquishment regarding Civil Code Section 
1542, Hughes, on one hand, and Whittaker, on the other hand, acknowledge that 
they are aware that they or their attorneys may hereafter discover facts 
different from or in addition to the facts of which they or their attorneys now 
are aware with respect to the subject matter of this Second Amendment. Hughes, 
on one hand, and Whittaker, on the other hand, and each of them acknowledge that
they have been advised by an attorney at law as to the meaning and effect of, 
and understand, Section 1542.

     (d)  (i)  Hughes hereby agrees and covenants, and to the extent allowable
               under law agrees and covenants on behalf of its successors,
               assigns, affiliates and agents, not to commence, prosecute or aid
               in any way any action or other proceeding (whether legal,
               equitable or administrative) against Whittaker and/or its
               successors, assigns, affiliates, subsidiaries, stockholders,
               directors, officers, employees, attorneys, consultants,
               representatives and agents, based upon or relating in any way to
               the Agreement, which is the subject of the release by Hughes
               contained herein, either affirmatively or by way of cross-
               complaint, defense or counterclaim.

          (ii)  Whittaker hereby agrees and covenants, and to the extent
                allowable under law agrees and covenants on behalf of its
                successors, assigns, affiliates and agents, not to commence,
                prosecute or aid in any way any action or other proceeding
                (whether legal, equitable or administrative) against Hughes
                and/or its successors, assigns, affiliates, subsidiaries,
                stockholders, directors, officers, employees, attorneys,
                consultants, representatives and agents, based upon or relating
                in any way to the Agreement, which is the subject of the release
                by

                                       7
<PAGE>
 
               Whittaker contained herein, either affirmatively or by way of 
               cross-complaint, defense, or counterclaim.

      (e)  The parties hereto have entered into this Second Amendment for the
           purpose of obtaining the complete and final settlement of the
           disputes between them and to avoid the burden, inconvenience and
           expense of litigation. Nothing in this Second Amendment shall be
           construed to constitute an admission of liability of any kind
           whatsoever by any party, or of any unlawful or actionable conduct.
           Nothing in this Second Amendment shall be construed to constitute an
           adjudication of the merits of any claim or any issue of fact or law
           between the parties hereto.

7.  Effect of Second Amendment. Except as expressly amended hereby, the
    --------------------------
    Agreement, the Note and the Registration Agreement are each ratified and
    confirmed and shall remain in effect in accordance with their respective
    terms. All references in the Agreement or any Related Document to the
    Agreement shall mean the Agreement as amended by this Second Amendment.


IN WITNESS WHEREOF, this Second Amendment to Stock Purchase Agreement has been 
duly executed by the duly authorized officers of Whittaker and Hughes as of the 
date first written above.


                                               WHITTAKER CORPORATION,
                                               a Delaware corporation

                                               By:  /s/ John K. Otto
                                                   ----------------------------

                                               Its: Chief Financial Officer



                                               HUGHES ELECTRONICS
                                               CORPORATION,
                                               a Delaware corporation

                                               By:  /s/ Roxanne S. Austin
                                                   ----------------------------

                                               Its: Senior VP and CFO

                                       8
<PAGE>
 
                                                                       EXHIBIT 1
                                                                       ---------



                                 ALLONGE NO.1
                                 ------------


                                                         Los Angeles, California
                                                                     May 4, 1998



                                   RECITALS

     WHEREAS, the undersigned, Whittaker Corporation, a Delaware corporation
(the "Company"), issued that certain 7% Convertible Subordinated Note due May 1,
2005, dated April 24, 1995 (the "Note"), in favor of Hughes Electronics
Corporation, a Delaware corporation ("Hughes");


                                    ALLONGE


     NOW THEREFORE, the Company hereby agrees with Hughes that, effective as of
the date of this Allonge No. 1 (the "Effective Date"):


     1.  A new Section 3.1(f) is hereby added to the Note as follows:

         If the Company redeems this Note in whole or in part prior to May 4,
         2002, the Company shall issue to Hughes warrants to purchase the number
         of shares of Common Stock of the Company which would have been issued
         by the Company if Hughes had elected to convert the principal amount of
         the Note subject to such redemption at the conversion price, as defined
         in Section 4.1. The exercise price of the warrants shall be equal to
         the conversion price, as defined in Section 4.1, and such warrants
         shall expire on May 4, 2002. The form of such warrant is attached
         hereto as Exhibit A.

     2.  Section 4.1 of the Note is hereby amended in its entirely as follows:

         4.1 Conversion. The Holder of this Note shall have the right, at his
             ----------
         option, at any time up to and including April 25, 2005 (except that,
         with respect to any Note or portion of a Note which shall be called for
         redemption pursuant to Section 3.1 or repurchase pursuant to Section
         3.2, such right shall terminate, except as provided in Section 3.3, at
         the close of business on the fifth Business Day prior to the Redemption
         Date fixed for such Note or portion of a Note), to convert, subject to
         the terms and provisions of this Section 4, all or any part (but not
         less than $1,000,000
<PAGE>
 
         or the unpaid principal balance of this Note, whichever is less) of the
         principal of this Note into shares of Common Stock of the Company at
         $16.97 per share; or, in case an adjustment of such price has taken
         place pursuant to the provisions of Section 4.3, then at the price as
         last adjusted (such price or adjusted price being referred to herein as
         the "conversion price"), upon surrender of the Note, the principal of
         which is so to be converted, accompanied by a conversion notice in the
         form provided (or separate written notice reasonably satisfactory to
         the Company) (hereinafter referred to as the "conversion notice") duly
         executed, to the Company at any time during usual business hours and,
         if so required by the Company, accompanied by a written instrument or
         instruments of transfer in form satisfactory to the Company duly
         executed by the Holder or his attorney duly authorized in writing. For
         convenience, the conversion of all or any portion of the principal of
         any Note into the Common Stock is hereinafter sometimes referred to as
         the "conversion" of such Note.

     3.  Section 4.4 of the Note is hereby amended in its entirety as follows:

         4.4 Fractional Shares and Fractional Warrants. No fractional shares or
             -----------------------------------------
         fractional warrants or scrip representing fractional shares or
         fractional warrants shall be issued upon the conversion of any Note or
         the issuance of any warrants pursuant to Section 3.1(f) hereof. If the
         conversion of any Note or the issuance of any warrants pursuant to
         Section 3.1(f) hereof results in a fraction, the Holder shall be paid
         an amount equal to such fraction multiplied by the Current Market Price
         (determined as provided in Section 4.3(d)).

     4.  Except as otherwise expressly defined herein, all capitalized terms
         used in this Allonge No. 1 shall have the same meaning as defined in
         the Note.

     The Company hereby authorizes Hughes to attach this Allonge No. 1 to the 
front of the Note.

                                            WHITTAKER CORPORATION


                                            By:    
                                                  ---------------------------
                                            Name:  
                                                  ---------------------------
                                            Title:
                                                  --------------------------- 


                                       2
<PAGE>
 
                                                                       EXHIBIT A
                                                                       ---------

                                                              [Date of Issuance]

               THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE 
         SECURITIES ACT OF 1933 NOR UNDER APPLICABLE STATE SECURITIES
          LAWS AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED
               OF UNLESS IT HAS BEEN REGISTERED UNDER SUCH LAWS
                OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE

                              WARRANT TO PURCHASE
                                 COMMON STOCK
                                      OF
                             WHITTAKER CORPORATION

                            VOID AFTER MAY 4, 2002


     THIS CERTIFIES that, for value received, Hughes Electronics Corporation 
("Warrant Holder"), is entitled, subject to the terms of Section 1 hereof, to 
subscribe for and purchase from Whittaker Corporation, a Delaware corporation 
(the "Company"), at the price of [the conversion price of the 7% Convertible 
Subordinated Note due May 1, 2005, dated April 24, 1995, as adjusted by Allonge 
No. 1 thereto in effect on the date of issuance of the Warrant] per share, or in
case an adjustment of such price has taken place pursuant to the provisions of 
Section 2 hereof, then at the price as last adjusted (such price or adjusted 
price, hereinafter called the "Warrant Price"), up to [the principal amount of 
the 7% Convertible Subordinated Note due May 1, 2005, dated April 24, 1995, as 
adjusted by Allonge No. 1 thereto, being redeemed, divided by the Warrant Price 
in effect on the date of issuance of the Warrant] fully paid, nonassessable 
shares of Common Stock, $.01 par value, of the Company ("Common Stock"), or in 
case an adjustment in the number of shares of Common Stock has taken place 
pursuant to Section 2 hereof, then such adjusted number of shares of Common 
Stock, subject, however, to the provisions and upon the terms and conditions 
hereinafter set forth, including, without limitation, the provisions of Section 
3 hereof.

     1.  Exercise of Warrant.
         -------------------

         (a)  This Warrant shall be exercisable at any time or from time to time
after the date of issuance on or prior to May 4, 2002.  This Warrant may be 
exercised by the Warrant Holder hereof, in whole or in part (but not for less 
than the number of shares of Common Stock determined by dividing $1,000,000 by 
the Warrant Price, or the total number of shares of Common Stock subject to the 
Warrant, whichever is less), by the completion of the subscription form attached
hereto and by the surrender of this Warrant (properly endorsed) at the principal
executive offices of the Company (or at such other agency or office of the 
Company in the United States as it may designate by notice in writing to the 
Warrant Holder at the address of the Warrant Holder appearing on the books of 
the Company), and by payment to the Company of the Warrant Price, in cash, by 
wire transfer in immediately available funds, or by certified or official bank 
check, for each share of Common Stock being purchased.

                                  Page 1 or 9
<PAGE>
 
      (b)  As promptly as practicable after the exercise of rights represented 
by the Warrant, the Company shall deliver or cause to be delivered to the 
Warrant Holder certificates representing the number of fully paid and 
nonassessable shares of Common Stock so purchased.  Such exercise shall be 
deemed to have been made at the close of business on the date that the Warrant 
shall have been exercised with the subscription form duly executed, so that the 
rights of the Warrant Holder as such holder shall cease at such time and, 
subject to the following provisions of this paragraph, the Warrant Holder shall 
be treated for all purposes as having become the record holder of such shares of
Common Stock at such time, and such exercise shall be at the Warrant Price in 
effect at such time; provided, however, that no such exercise on any date when 
the stock transfer books of the Company shall be closed shall be effective to 
constitute the Warrant Holder as the record holder of such shares of Common 
Stock on such date, but such exercise shall be effective to constitute the 
Warrant Holder as the record holder thereof for all purposes at the close of 
business on the next succeeding day on which such stock transfer books are open;
such exercise shall be at the Warrant Price in effect on the date that such 
Warrant shall have been exercised, as if the stock transfer books of the Company
had not been closed.

      (c)  If the Warrant shall be exercised in part, then the Company shall,
upon surrender of the Warrant to the Company, issue a new Warrant entitling the
Warrant Holder to subscribe for and purchase, on the terms hereof, the number of
shares of Common Stock equal to the difference between (i) the number of shares
of Common Stock subject to subscription and purchase pursuant to the Warrant
being surrendered and (ii) the number of shares of Common Stock being purchased
pursuant to such partial exercise.

      (d)  If the last day for the exercise of the Warrant shall not be a 
Business Day, then the Warrant may be exercised on the next succeeding Business 
Day.

  2.  Antidilution Provisions.
      -----------------------

  The Warrant Price and the number of shares of Common Stock issuable upon
exercise of the Warrant shall be subject to adjustment from time to time as
follows:

      (a)  If the Company shall (i) pay a dividend or make a distribution on the
outstanding shares of its Common Stock in shares of its Common Stock, (ii) 
subdivide or reclassify the outstanding shares of its Common Stock into a 
greater number of shares, or (iii) combine or reclassify the outstanding shares 
of its Common Stock into a smaller number of shares, (x) the number of shares of
Common Stock issuable upon exercise of the Warrant at the time of the record 
date for such dividend or distribution or the effective date of such 
subdivision, combination or reclassification shall be proportionately adjusted 
so that the Warrant Holder upon exercise of the Warrant after such time shall be
entitled to receive the number of shares of Common Stock which the Warrant 
Holder would have owned or been entitled to receive had the Warrant been 
exercised immediately prior to such time and (y) the Warrant Price in effect at 
the time of the record date for such dividend or distribution or the effective 
date of such subdivision, combination or reclassification shall be adjusted 
immediately thereafter so that it shall equal the price determined by 
multiplying the Warrant Price in effect immediately prior thereto by a fraction 
of which the numerator shall be the number of shares of Common Stock issuable 
upon exercise of the Warrant immediately prior to the adjustment in the 
preceding clause (x) and of which the denominator shall be the number of shares 
of Common Stock issuable upon exercise

                                  Page 2 of 9
<PAGE>
 
of the Warrant immediately after the adjustment in the preceding clause (x). 
Any shares of Common Stock issuable in payment of a dividend shall be deemed to 
have been issued immediately prior to the time of the record date for such 
dividend for purposes of calculating the number of outstanding shares of Common 
Stock under subsections (b) and (c) below. Such adjustment shall be made 
successively whenever any event specified above shall occur.

          (b)   If the Company shall fix a record date for the issuance of 
rights or warrants (other than this Warrant or replacements thereof) to all 
holders of its Common Stock entitling them to subscribe for or purchase shares 
of its Common Stock (or securities convertible into shares of its Common Stock) 
at a price per share (or having a conversion price per share) less than the 
Current Market Price (as defined in subsection (d) below) of a share of Common 
Stock on such record date, (i) the Warrant Price shall be adjusted immediately 
thereafter so that it shall equal the price determined by multiplying the 
Warrant Price in effect immediately prior thereto by a fraction ("Fraction B"),
of which the numerator shall be the number of shares of Common Stock outstanding
on such record date plus the number of shares of Common Stock which the 
aggregate offering price of the total number of shares of such Common Stock so 
offered for subscription or purchase would purchase at the Current Market Price 
per share (determined by multiplying such total number of shares by the exercise
price of such rights or warrants (or by the applicable conversion price in the 
case of convertible securities) and dividing the product so obtained by such 
Current Market Price), and of which the denominator shall be the number of 
shares of Common Stock outstanding on such record date plus the number of 
additional shares of Common Stock offered for subscription or purchase (or into 
which the convertible securities so offered are initially convertible); and (ii)
the number of shares of Common Stock issuable upon exercise of the Warrant 
shall be adjusted immediately thereafter so that such number shall equal the 
number of shares of Common Stock issuable upon exercise of the Warrant 
immediately prior thereto multiplied by the reciprocal of Fraction B. Shares 
of Common Stock owned by or held for the account of Company or its Subsidiaries 
shall not be deemed outstanding for the purpose of any such computation. Such 
adjustment shall be made successively whenever such a record date is fixed. In 
the event that such rights or warrants are not so issued, the Warrant Price then
in effect shall be readjusted to the Warrant Price which would then be in effect
if such record date had not been fixed.

          (c)   If the Company shall fix a record date for the making of a 
distribution to all holders of shares of its Common Stock (i) of shares of any 
class of its Capital Stock other than its Common Stock or (ii) of evidences of 
its indebtedness or (iii) of other assets (excluding non-extraordinary cash 
dividends or distributions, and dividends or distributions referred to in 
subsection (a) above) or (iv) of rights or warrants to subscribe for or purchase
its securities (excluding those referred to in subsection (b) above and other 
than this Warrant or replacements thereof), than in each such case (x) the 
Warrant Price shall be adjusted immediately thereafter so that it shall equal 
the price determined by multiplying the Warrant Price in effect immediately 
prior thereto by a fraction ("Fraction C"), of which the numerator shall be the
total number of shares of Common Stock outstanding  multiplied by the Current 
Market Price per share on such record date, less the fair market value (as
determined by the Board of Directors of the Company in good faith, and described
in a resolution of the Board of Directors of the Company) of said shares or
evidences of indebtedness or assets or rights or warrants so distributed, and of
which the denominator shall be the total number of shares of Common Stock
outstanding multiplied by such Current Market Price per share; and (y) the
number of shares of Common Stock issuable

                                  Page 3 of 9
<PAGE>
 
upon exercise of the Warrant shall be adjusted immediately thereafter so that 
such number shall equal the number of shares of Common Stock issuable upon 
exercise of the Warrant immediately prior thereto multiplied by the reciprocal 
of Fraction C. Such adjustment shall be made successively whenever such a record
date is fixed. In the event that such distribution is not so made, the Warrant 
Price then in effect shall be readjusted to the Warrant Price which would then 
be in effect if such record date had not been fixed.

     (d)  For the purpose of any computation under subsections (b) and (c) 
above, the Current Market Price per share on any date shall be deemed to be the 
average of the daily closing prices for the 10 consecutive trading days 
immediately preceding such date. The closing price for each day shall be the 
last reported sales price regular way or, in case no such reported sale takes 
place on such day, the average of the reported closing bid and asked prices 
regular way, in either case on the New York Stock Exchange, or, if the Common 
Stock is not listed or admitted to trading on such Exchange, on the principal 
national securities exchange or national automated quotation system on which the
Common Stock is listed or admitted to trading or quoted or, if not so listed or 
admitted to trading or quoted, the average of the closing bid and asked prices 
in the over-the-counter market as furnished by any New York Stock Exchange firm 
selected from time to time by the Company for that purpose and reasonably 
satisfactory to the Warrant Holder. For purposes of this subsection (d), the 
term "trading day" shall not include any day on which securities are not traded 
on such exchange or in such market.

     (e)  In any case in which this Section 2 shall require that an adjustment
shall become effective immediately after a record date or an effective date for
an event, the Company may defer until the occurrence of such event issuing to
the Warrant Holder upon exercise of the Warrant after such record date or
effective date and before the occurrence of such event the shares issuable upon
such exercise. If such adjustment results in a reduction of the Warrant Price,
the Company shall return to the Warrant Holder the difference between the amount
previously received by the Company from the Warrant Holder in connection with
such exercise and such lesser amount due as a result of such reduction in the
Warrant Price. If such adjustment results in an increase in the Warrant Price,
the Warrant Holder shall deliver to the Company the difference between such
greater amount due in connection with such exercise as a result of such increase
in the Warrant Price and the amount previously received by the Company in
connection with such exercise.

     (f)  No adjustment in the Warrant Price shall be required unless such 
adjustment would require an increase or decrease of at least 1% in such price; 
provided, however, that any adjustment which by reason of this subsection (f) is
not required to be made shall be carried forward and taken into account in any 
subsequent adjustment.

                                  Page 4 of 9
<PAGE>
 


          (g)   Whenever the Warrant Price and number of shares of Common Stock
issuable upon exercise of the Warrant are adjusted as provided in this Section
2, the Company shall promptly provided the Warrant Holder (i) an Officers'
Certificate in the case of any adjustment pursuant to subsection (a) of this
Section 2 or (ii) an Opinion of Counsel in the case of any other adjustment, in
each case setting forth the Warrant Price and number of shares of Common Stock
issuable upon exercise of the Warrant after such adjustment and setting forth a
brief statement of the facts requiring such adjustment and the computation
thereof, which Officers' Certificate or Opinion of Counsel, as the case may be,
shall be prima facie evidence of the correctness of any such adjustment absent
manifest error.

          (h)   All calculations under this Section 2 shall be made to the
nearest cent or to the nearest one-hundredth of a share, as the case may be.

    3.    Fractional Shares.  No fractional shares or scrip representing 
          ----------------- 
fractional shares shall be issued upon the exercise of the Warrant.

    4.    Mergers, Etc.
          -------------

          (a) In case of any consolidation with or merger of the Company into
another corporation (other than a merger or consolidation in which the Company
is the continuing corporation), or in case of any sale, lease or conveyance to
another Person of the property of the Company as an entirety or substantially as
an entirety, such successor, leasing or purchasing corporation, as the case may
be, shall execute a supplemental instrument to this Warrant providing that the
Warrant Holder shall have the right thereafter to exercise this Warrant for the
kind and amount of shares of stock, other securities or property, including
cash, receivable upon such consolidation, merger, sale, lease or conveyance by a
holder of the number of shares of Common Stock for which this Warrant might have
been exercised immediately prior to such consolidation, merger, sale, lease or
conveyance.

          (b) In case of (i) any reclassification or change of the shares of
Common Stock of the Company issuable upon exercise of this Warrant or (ii) any
consolidation with or merger of another corporation into the Company in which
the Company is the continuing corporation and in which there is a
reclassification or change of the shares of Common Stock issuable upon exercise
of this Warrant (in each case, other than a change in par value, or from par
value to no par value, or as a result of a subdivision or combination subject to
Section 2(a), but including any change in the shares of Common Stock into two or
more classes or series of shares), the Company shall execute a supplemental
instrument to this Warrant providing that the Warrant Holder shall have the
right thereafter to exercise this Warrant for the kind and amount of shares of
stock, other securities or property, including cash, receivable upon such
reclassification, change, consolidation or merger by a holder of the number of
shares of Common Stock for which this Warrant might have been exercised
immediately prior to such reclassification, change, consolidation or merger.


                                  Page 5 of 9



<PAGE>
 
      
             (c) Any supplemental instrument entered into pursuant to this
Section 4 shall (i) where appropriate, state the Warrant Price in terms of one
full share of Common Stock or one full share of the Capital Stock of any
successor, leasing or purchasing corporation and (ii) provide for adjustments,
which shall be as nearly equivalent as may be practicable to the adjustments
provided for in this Warrant. A copy of each such supplemental instrument shall
be promptly provided to each Warrant Holder.

             (d)  The above provisions of this Section 4 shall similarly apply 
to successive reclassifications and changes of shares and to successive 
consolidations, mergers, sales or conveyances.

         5.  Reservation of Shares.  The Company covenants that it will at all 
             --------------------- 
times reserve and keep available, free from pre-emptive rights, out of its 
authorized Common Stock, solely for the purpose of issue upon exercise of the
Warrant as herein provided, such number of shares of Common Stock as shall then
be issuable upon the exercise of the Warrant. The Company covenants that all
shares of Common Stock which shall be so issuable shall be duly and validly
issued and fully paid and nonassessable.

         6.  Corporate Action.
             ----------------

             (a)  Before taking any action which would cause an adjustment 
reducing the Warrant Price below the then stated or par value of the shares of 
Common Stock issuable upon exercise of the Warrants, the Company will take any
corporate action which may, in the opinion of its counsel, be necessary in order
that the Company may validly and legally issue fully paid and nonassessable
shares of such Common Stock at such adjusted Warrant Price.

             (b)  The Company covenants that if any shares of Common Stock, 
required to be reserved for purposes of exercise of the Warrant hereunder, 
require registration with or approval of any governmental authority under any 
United States Federal or State Law, or listing upon the New York Stock Exchange
or any other applicable national securities exchange or quotation system, before
such shares may be issued upon exercise, the Company will in good faith and as
expeditiously as possible endeavor to cause such shares to be duly registered,
approved or listed, as the case may be.

         7.  No Charge.  The issuance of certificates for shares of Common Stock
             ---------
upon the exercise of the Warrant shall be made without charge to the Warrant
Holder for any tax in respect of the issuance of such certificates, and such
certificates shall be issued in the name of the Warrant Holder.

         8.  Notice.  If at any time the Company shall propose:
             ------

             (a)  to pay any dividend or make any distribution on shares of its 
Common Stock in shares of its Common Stock or to fix a record date for the
making of any other distribution (other than a non-extraordinary cash dividend
or distribution) to all holders of shares of its Common Stock; or

                                  Page 6 of 9

      
          
  
<PAGE>
 


          (b)   to fix a record date for the issuance of rights or warrants
(other than this Warrant or replacements thereof) to all holders of shares of
its Common Stock entitling them to purchase any additional shares of its Common
Stock or any other securities; or

          (c)   to effect any reclassification, subdivision or combination of 
outstanding shares of its Common Stock; or

          (d)   to effect any liquidation, dissolution or winding-up of the 
Company;

then, and in any one or more of such cases, the Company shall cause notice 
thereof to be mailed to the Warrant Holder at the Warrant Holder's last address 
known to the Company at least 30 days prior to the date on which (i) the books 
of the Company shall close, or a record shall be taken, for such dividend, 
distribution or issuance of rights or warrants or (ii) such reclassification, 
subdivision, combination, liquidation, dissolution or winding-up shall become 
effective, as the case may be.

     9.  No Stockholder Rights or Liabilities.  This Warrant shall not entitle 
         ------------------------------------   
the Warrant Holder to any voting rights or other rights as a stockholder of the
Company. No provision hereof, in the absence of affirmative action by the
Warrant Holder to purchase shares of Common Stock, and no mere enumeration
herein of the rights or privileges of the Warrant Holder, shall give rise to any
lability of the Warrant Holder for the Warrant Price or as a stockholder of the
Company, whether such liability is asserted by the Company or by creditors of
the Company.

    10.  No Impairment. The Company will not, by amendment of its Certificate 
         -------------
of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of the
terms to be observed or performed under this Warrant by the Company, but will at
all times in good faith assist in carrying out all of the provisions of this
Warrant in order to protect the rights of the Warrant Holder against impairment
of the exercise rights provided for herein.

   11.  Lost, Stolen, Mutilated or Destroyed Warrant.  If this Warrant is lost, 
        --------------------------------------------
stolen, mutilated or destroyed, the Company may, on such terms as to indemnity 
or otherwise as it may in its discretion reasonably impose (which shall, in the 
case of a mutilated Warrant, include the surrender thereof), issue a new Warrant
of like denomination and tenor as the Warrant so lost, stolen, mutilated or 
destroyed.  Any such new Warrant shall constitute an original contractual 
obligation of the Company, whether or not the allegedly lost, stolen, mutilated
or destroyed Warrant shall be at any time enforceable by anyone.


                                  Page 7 of 9


<PAGE>
 
     12.  Notices. All notices, requests and other communications required or 
          -------
permitted to be given or delivered hereunder shall be in writing, and shall be 
delivered, or shall be sent by national overnight courier service or by 
certified or registered mail, postage prepaid and addressed, if to the Warrant 
Holder, to the Warrant Holder at the address shown on the records of the Company
or at such other address as shall have been furnished to the Company by notice 
from the Warrant Holder and, if to the Company, addressed to the Company at 1955
North Surveyor Avenue, Simi Valley, California 93063, Attention: President, or 
at such other address as shall have been furnished to the Warrant Holder by 
notice from the Company.

     13.  Definitions. Except as otherwise expressly defined herein, capitalized
          ----------- 
terms used in this Warrant shall have the same meaning as defined in that 
certain 7% Convertible Subordinated Note, dated April 24, 1995, as adjusted by 
Allonge No. 1 thereto.

     IN WITNESS WHEREOF, WHITTAKER CORPORATION, has executed this Warrant on and
as of the day and year first above written.


                                                   WHITTAKER CORPORATION


                                               By
                                                   ------------------------
                                                   [Title]


[Corporate Seal]




Attest:


_________________________
Secretary

                                  Page 8 of 9
<PAGE>
 
                       SUBSCRIPTION FORM TO BE EXECUTED
                         UPON EXERCISE OF THE WARRANT

                                                           Date_________________


To Whittaker Corporation:

      The undersigned, pursuant to the provisions set forth in the within 
Warrant, hereby agrees to subscribe for and purchase ______ shares of Common 
Stock covered by such Warrant, and herewith tenders $______ in full payment of 
the purchase price for such shares.


                                               HUGHES ELECTRONICS CORPORATION


                                               By 
                                                  ---------------------------

                                               Address
                                                       ----------------------

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

                                  Page 9 of 9

<PAGE>
 
                                                                    EXHIBIT 10.2

                                 ALLONGE NO. 1
                                 -------------


                                                         Los Angeles, California
                                                                     May 4, 1998



                                   RECITALS

     WHEREAS, the undersigned, Whittaker Corporation, a Delaware corporation
(the "Company"), issued that certain 7% Convertible Subordinated Note due May 1,
2005, dated April 24, 1995 (the "Note"), in favor of Hughes Electronics
Corporation, a Delaware corporation ("Hughes");


                                    ALLONGE

     NOW THEREFORE, the Company hereby agrees with Hughes that, effective as of
the date of this Allonge No. 1 (the "Effective Date"):

     1.   A new Section 3.1(f) is hereby added to the Note as follows:

          If the Company redeems this Note in whole or in part prior to May 4,
          2002, the Company shall issue to Hughes warrants to purchase the
          number of shares of Common Stock of the Company which would have been
          issued by the Company if Hughes had elected to convert the principal
          amount of the Note subject to such redemption at the conversion price,
          as defined in Section 4.1.  The exercise price of the warrants shall
          be equal to the conversion price, as defined in Section 4.1, and such
          warrants shall expire on May 4, 2002.  The form of such warrant is
          attached hereto as Exhibit A.

     2.   Section 4.1 of the Note is hereby amended in its entirety as follows:

          4.1  Conversion.  The Holder of this Note shall have the right, at his
               ----------                                                       
          option, at any time up to and including April 25, 2005 (except that,
          with respect to any Note or portion of a Note which shall be called
          for redemption pursuant to Section 3.1 or repurchase pursuant to
          Section 3.2, such right shall terminate, except as provided in Section
          3.3, at the close of business on the fifth Business Day prior to the
          Redemption Date fixed for such Note or portion of a Note), to convert,
          subject to the terms and provisions of this Section 4, all or any part
          (but not less than $1,000,000
<PAGE>
 
          or the unpaid principal balance of this Note, whichever is less) of
          the principal of this Note into shares of Common Stock of the Company
          at $16.97 per share; or, in case an adjustment of such price has taken
          place pursuant to the provisions of Section 4.3, then at the price as
          last adjusted (such price or adjusted price being referred to herein
          as the "conversion price"), upon surrender of the Note, the principal
          of which is so to be converted, accompanied by a conversion notice in
          the form provided (or separate written notice reasonably satisfactory
          to the Company) (hereinafter referred to as the "conversion notice")
          duly executed, to the Company at any time during usual business hours
          and, if so required by the Company, accompanied by a written
          instrument or instruments of transfer in form satisfactory to the
          Company duly executed by the Holder or his attorney duly authorized in
          writing.  For convenience, the conversion of all or any portion of the
          principal of any Note into the Common Stock is hereinafter sometimes
          referred to as the "conversion" of such Note.

     3.   Section 4.4 of the Note is hereby amended in its entirety as follows:

          4.4  Fractional Shares and Fractional Warrants.  No fractional shares
               -----------------------------------------                       
          or fractional warrants or scrip representing fractional shares or
          fractional warrants shall be issued upon the conversion of any Note or
          the issuance of any warrants pursuant to Section 3.1(f) hereof.  If
          the conversion of any Note or the issuance of any warrants pursuant to
          Section 3.1(f) hereof results in a fraction, the Holder shall be paid
          an amount equal to such fraction multiplied by the Current Market
          Price (determined as provided in Section 4.3(d)).

     4.   Except as otherwise expressly defined herein, all capitalized terms
          used in this Allonge No. 1 shall have the same meaning as defined in
          the Note.


     The Company hereby authorizes Hughes to attach this Allonge No. 1 to the
front of the Note.

                              WHITTAKER CORPORATION


                              BY:     /S/ JOHN K. OTTO
                                      ----------------
                              NAME:   JOHN K. OTTO
                                      ------------
                              TITLE:  CHIEF FINANCIAL OFFICER
                                      -----------------------

                                       2
<PAGE>
 
                                                                       EXHIBIT A
                                                                       ---------

                                                              [DATE OF ISSUANCE]

               THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE 
         SECURITIES ACT OF 1933 NOR UNDER APPLICABLE STATE SECURITIES 
         LAWS AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED 
               OF UNLESS IT HAS BEEN REGISTERED UNDER SUCH LAWS 
                OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE

                              WARRANT TO PURCHASE
                                 COMMON STOCK
                                      OF
                             WHITTAKER CORPORATION

                            VOID AFTER MAY 4, 2002

     THIS CERTIFIES that, for value received, Hughes Electronics Corporation
("Warrant Holder"), is entitled, subject to the terms of Section 1 hereof, to
subscribe for and purchase from Whittaker Corporation, a Delaware corporation
(the "Company"), at the price of [the conversion price of the 7% Convertible
Subordinated Note due May 1, 2005, dated April 24, 1995, as adjusted by Allonge
No. 1 thereto in effect on the date of issuance of the Warrant] per share, or in
case an adjustment of such price has taken place pursuant to the provisions of
Section 2 hereof, then at the price as last adjusted (such price or adjusted
price, hereinafter called the "Warrant Price"), up to [the principal amount of
the 7% Convertible Subordinated Note due May 1, 2005, dated April 24, 1995, as
adjusted by Allonge No. 1 thereto, being redeemed, divided by the Warrant Price
in effect on the date of issuance of the Warrant] fully paid, nonassessable
shares of Common Stock, $.01 par value, of the Company ("Common Stock"), or in
case an adjustment in the number of shares of Common Stock has taken place
pursuant to Section 2 hereof, then such adjusted number of shares of Common
Stock, subject, however, to the provisions and upon the terms and conditions
hereinafter set forth, including, without limitation, the provisions of Section
3 hereof.

     1.   Exercise of Warrant.
          ------------------- 

          (a) This Warrant shall be exercisable at any time or from time to time
after the date of issuance on or prior to May 4, 2002.  This Warrant may be
exercised by the Warrant Holder hereof, in whole or in part (but not for less
than the number of shares of Common Stock determined by dividing $1,000,000 by
the Warrant Price, or the total number of shares of Common Stock subject to the
Warrant, whichever is less), by the completion of the subscription form attached
hereto and by the surrender of this Warrant (properly endorsed) at the principal
executive offices of the Company (or at such other agency or office of the
Company in the United States as it may designate by notice in writing to the
Warrant Holder at the address of the Warrant Holder appearing on the books of
the Company), and by payment to the Company of the Warrant Price, in cash, by
wire transfer in immediately available funds, or by certified or official bank
check, for each share of Common Stock being purchased.

                                  Page 1 of 9
<PAGE>
 
          (b) As promptly as practicable after the exercise of rights
represented by the Warrant, the Company shall deliver or cause to be delivered
to the Warrant Holder certificates representing the number of fully paid and
nonassessable shares of Common Stock so purchased.  Such exercise shall be
deemed to have been made at the close of business on the date that the Warrant
shall have been exercised with the subscription form duly executed, so that the
rights of the Warrant Holder as such holder shall cease at such time and,
subject to the following provisions of this paragraph, the Warrant Holder shall
be treated for all purposes as having become the record holder of such shares of
Common Stock at such time, and such exercise shall be at the Warrant Price in
effect at such time; provided, however, that no such exercise on any date when
the stock transfer books of the Company shall be closed shall be effective to
constitute the Warrant Holder as the record holder of such shares of Common
Stock on such date, but such exercise shall be effective to constitute the
Warrant Holder as the record holder thereof for all purposes at the close of
business on the next succeeding day on which such stock transfer books are open;
such exercise shall be at the Warrant Price in effect on the date that such
Warrant shall have been exercised, as if the stock transfer books of the Company
had not been closed.

          (c) If the Warrant shall be exercised in part, then the Company shall,
upon surrender of the Warrant to the Company, issue a new Warrant entitling the
Warrant Holder to subscribe for and purchase, on the terms hereof, the number of
shares of Common Stock equal to the difference between (i) the number of shares
of Common Stock subject to subscription and purchase pursuant to the Warrant
being surrendered and (ii) the number of shares of Common Stock being purchased
pursuant to such partial exercise.

          (d) If the last day for the exercise of the Warrant shall not be a
Business Day, then the Warrant may be exercised on the next succeeding Business
Day.

     2.   Antidilution Provisions.
          ----------------------- 

     The Warrant Price and the number of shares of Common Stock issuable upon
exercise of the Warrant shall be subject to adjustment from time to time as
follows:

          (a) If the Company shall (i) pay a dividend or make a distribution on
the outstanding shares of its Common Stock in shares of its Common Stock, (ii)
subdivide or reclassify the outstanding shares of its Common Stock into a
greater number of shares, or (iii) combine or reclassify the outstanding shares
of its Common Stock into a smaller number of shares, (x) the number of shares of
Common Stock issuable upon exercise of the Warrant at the time of the record
date for such dividend or distribution or the effective date of such
subdivision, combination or reclassification shall be proportionately adjusted
so that the Warrant Holder upon exercise of the Warrant after such time shall be
entitled to receive the number of shares of Common Stock which the Warrant
Holder would have owned or been entitled to receive had the Warrant been
exercised immediately prior to such time and (y) the Warrant Price in effect at
the time of the record date for such dividend or distribution or the effective
date of such subdivision, combination or reclassification shall be adjusted
immediately thereafter so that it shall equal the price determined by
multiplying the Warrant Price in effect immediately prior thereto by a fraction
of which the numerator shall be the number of shares of Common Stock issuable
upon exercise of the Warrant immediately prior to the adjustment in the
preceding clause (x) and of which the denominator shall be the number of shares
of Common Stock issuable upon exercise 

                                  Page 2 of 9
<PAGE>
 
of the Warrant immediately after the adjustment in the preceding clause (x). Any
shares of Common Stock issuable in payment of a dividend shall be deemed to have
been issued immediately prior to the time of the record date for such dividend
for purposes of calculating the number of outstanding shares of Common Stock
under subsections (b) and (c) below. Such adjustment shall be made successively
whenever any event specified above shall occur.

          (b) If the Company shall fix a record date for the issuance of rights
or warrants (other than this Warrant or replacements thereof) to all holders of
its Common Stock entitling them to subscribe for or purchase shares of its
Common Stock (or securities convertible into shares of its Common Stock) at a
price per share (or having a conversion price per share) less than the Current
Market Price (as defined in subsection (d) below) of a share of Common Stock on
such record date, (i) the Warrant Price shall be adjusted immediately thereafter
so that it shall equal the price determined by multiplying the Warrant Price in
effect immediately prior thereto by a fraction ("Fraction B"), of which the
numerator shall be the number of shares of Common Stock outstanding on such
record date plus the number of shares of Common Stock which the aggregate
offering price of the total number of shares of such Common Stock so offered for
subscription or purchase would purchase at the Current Market Price per share
(determined by multiplying such total number of shares by the exercise price of
such rights or warrants (or by the applicable conversion price in the case of
convertible securities) and dividing the product so obtained by such Current
Market Price), and of which the denominator shall be the number of shares of
Common Stock outstanding on such record date plus the number of additional
shares of Common Stock offered for subscription or purchase (or into which the
convertible securities so offered are initially convertible); and (ii) the
number of shares of Common Stock issuable upon exercise of the Warrant shall be
adjusted immediately thereafter so that such number shall equal the number of
shares of Common Stock issuable upon exercise of the Warrant immediately prior
thereto multiplied by the reciprocal of Fraction B.  Shares of Common Stock
owned by or held for the account of Company or its Subsidiaries shall not be
deemed outstanding for the purpose of any such computation.  Such adjustment
shall be made successively whenever such a record date is fixed.  In the event
that such rights or warrants are not so issued, the Warrant Price then in effect
shall be readjusted to the Warrant Price which would then be in effect if such
record date had not been fixed.

          (c) If the Company shall fix a record date for the making of a
distribution to all holders of shares of its Common Stock (i) of shares of any
class of its Capital Stock other than its Common Stock or (ii) of evidences of
its indebtedness or (iii) of other assets (excluding non-extraordinary cash
dividends or distributions, and dividends or distributions referred to in
subsection (a) above) or (iv) of rights or warrants to subscribe for or purchase
its securities (excluding those referred to in subsection (b) above and other
than this Warrant or replacements thereof), then in each such case (x) the
Warrant Price shall be adjusted immediately thereafter so that it shall equal
the price determined by multiplying the Warrant Price in effect immediately
prior thereto by a fraction ("Fraction C"), of which the numerator shall be the
total number of shares of Common Stock outstanding multiplied by the Current
Market Price per share on such record date, less the fair market value (as
determined by the Board of Directors of the Company in good faith, and described
in a resolution of the Board of Directors of the Company) of said shares or
evidences of indebtedness or assets or rights or warrants so distributed, and of
which the denominator shall be the total number of shares of Common Stock
outstanding multiplied by such Current Market Price per share; and (y) the
number of shares of Common Stock issuable

                                  Page 3 of 9
<PAGE>
 
upon exercise of the Warrant shall be adjusted immediately thereafter so that
such number shall equal the number of shares of Common Stock issuable upon
exercise of the Warrant immediately prior thereto multiplied by the reciprocal
of Fraction C. Such adjustment shall be made successively whenever such a record
date is fixed. In the event that such distribution is not so made, the Warrant
Price then in effect shall be readjusted to the Warrant Price which would then
be in effect if such record date had not been fixed.

          (d) For the purpose of any computation under subsections (b) and (c)
above, the Current Market Price per share on any date shall be deemed to be the
average of the daily closing prices for the 10 consecutive trading days
immediately preceding such date.  The closing price for each day shall be the
last reported sales price regular way or, in case no such reported sale takes
place on such day, the average of the reported closing bid and asked prices
regular way, in either case on the New York Stock Exchange, or, if the Common
Stock is not listed or admitted to trading on such Exchange, on the principal
national securities exchange or national automated quotation system on which the
Common Stock is listed or admitted to trading or quoted or, if not so listed or
admitted to trading or quoted, the average of the closing bid and asked prices
in the over-the-counter market as furnished by any New York Stock Exchange firm
selected from time to time by the Company for that purpose and reasonably
satisfactory to the Warrant Holder.  For purposes of this subsection (d), the
term "trading day" shall not include any day on which securities are not traded
on such exchange or in such market.

          (e) In any case in which this Section 2 shall require that an
adjustment shall become effective immediately after a record date or an
effective date for an event, the Company may defer until the occurrence of such
event issuing to the Warrant Holder upon exercise of the Warrant after such
record date or effective date and before the occurrence of such event the shares
issuable upon such exercise.  If such adjustment results in a reduction of the
Warrant Price, the Company shall return to the Warrant Holder the difference
between the amount previously received by the Company from the Warrant Holder in
connection with such exercise and such lesser amount due as a result of such
reduction in the Warrant Price.  If such adjustment results in an increase in
the Warrant Price, the Warrant Holder shall deliver to the Company the
difference between such greater amount due in connection with such exercise as a
result of such increase in the Warrant Price and the amount previously received
by the Company in connection with such exercise.

          (f) No adjustment in the Warrant Price shall be required unless such
adjustment would require an increase or decrease of at least 1% in such price;
provided, however, that any adjustment which by reason of this subsection (f) is
not required to be made shall be carried forward and taken into account in any
subsequent adjustment.

                                  Page 4 of 9
<PAGE>
 
          (g) Whenever the Warrant Price and number of shares of Common Stock
issuable upon exercise of the Warrant are adjusted as provided in this Section
2, the Company shall promptly provide the Warrant Holder (i) an Officers'
Certificate in the case of an adjustment pursuant to subsection (a) of this
Section 2 or (ii) an Opinion of Counsel in the case of any other adjustment, in
each case setting forth the Warrant Price and number of shares of Common Stock
issuable upon exercise of the Warrant after such adjustment and setting forth a
brief statement of the facts requiring such adjustment and the computation
thereof, which Officers' Certificate or Opinion of Counsel, as the case may be,
shall be prima facie evidence of the correctness of any such adjustment absent
manifest error.

          (h) All calculations under this Section 2 shall be made to the nearest
cent or to the nearest one-hundredth of a share, as the case may be.

     3.   Fractional Shares.  No fractional shares or scrip representing
          -----------------                                             
fractional shares shall be issued upon the exercise of the Warrant.

     4.   Mergers, Etc.
          -------------

          (a) In case of any consolidation with or merger of the Company into
another corporation (other than a merger or consolidation in which the Company
is the continuing corporation), or in case of any sale, lease or conveyance to
another Person of the property of the Company as an entirety or substantially as
an entirety, such successor, leasing or purchasing corporation, as the case may
be, shall execute a supplemental instrument to this Warrant providing that the
Warrant Holder shall have the right thereafter to exercise this Warrant for the
kind and amount of shares of stock, other securities or property, including
cash, receivable upon such consolidation, merger, sale, lease or conveyance by a
holder of the number of shares of Common Stock for which this Warrant might have
been exercised immediately prior to such consolidation, merger, sale, lease or
conveyance.

          (b) In case of (i) any reclassification or change of the shares of
Common Stock of the Company issuable upon exercise of this Warrant or (ii) any
consolidation with or merger of another corporation into the Company in which
the Company is the continuing corporation and in which there is a
reclassification or change of the shares of Common Stock issuable upon exercise
of this Warrant (in each case, other than a change in par value, or from par
value to no par value, or as a result of a subdivision or combination subject to
Section 2(a), but including any change in the shares of Common Stock into two or
more classes or series of shares), the Company shall execute a supplemental
instrument to this Warrant providing that the Warrant Holder shall have the
right thereafter to exercise this Warrant for the kind and amount of shares of
stock, other securities or property, including cash, receivable upon such
reclassification, change, consolidation or merger by a holder of the number of
shares of Common Stock for which this Warrant might have been exercised
immediately prior to such reclassification, change, consolidation or merger.

                                  Page 5 of 9
<PAGE>
 
          (c) Any supplemental instrument entered into pursuant to this Section
4 shall (i) where appropriate, state the Warrant Price in terms of one full
share of Common Stock or one full share of the Capital Stock of any successor,
leasing or purchasing corporation and (ii) provide for adjustments, which shall
be as nearly equivalent as may be practicable to the adjustments provided for in
this Warrant.  A copy of each such supplemental instrument shall be promptly
provided to each Warrant Holder.

          (d) The above provisions of this Section 4 shall similarly apply to
successive reclassifications and changes of shares and to successive
consolidations, mergers, sales or conveyances.

     5.   Reservation of Shares.  The Company covenants that it will at all
          ---------------------                                            
times reserve and keep available, free from pre-emptive rights, out of its
authorized Common Stock, solely for the purpose of issue upon exercise of the
Warrant as herein provided, such number of shares of Common Stock as shall then
be issuable upon the exercise of the Warrant.  The Company covenants that all
shares of Common Stock which shall be so issuable shall be duly and validly
issued and fully paid and nonassessable.

     6.   Corporate Action.
          ---------------- 

          (a) Before taking any action which would cause an adjustment reducing
the Warrant Price below the then stated or par value of the shares of Common
Stock issuable upon exercise of the Warrants, the Company will take any
corporate action which may, in the opinion of its counsel, be necessary in order
that the Company may validly and legally issue fully paid and nonassessable
shares of such Common Stock at such adjusted Warrant Price.

          (b) The Company covenants that if any shares of Common Stock, required
to be reserved for purposes of exercise of the Warrant hereunder, require
registration with or approval of any governmental authority under any United
States Federal or State Law, or listing upon the New York Stock Exchange or any
other applicable national securities exchange or quotation system, before such
shares may be issued upon exercise, the Company will in good faith and as
expeditiously as possible endeavor to cause such shares to be duly registered,
approved or listed, as the case may be.

     7.   No Charge.  The issuance of certificates for shares of Common Stock
          ---------                                                          
upon the exercise of the Warrant shall be made without charge to the Warrant
Holder for any tax in respect of the issuance of such certificates, and such
certificates shall be issued in the name of the Warrant Holder.

     8.   Notice.  If at any time the Company shall propose:
          ------                                            

          (a) to pay any dividend or make any distribution on shares of its
Common Stock in shares of its Common Stock or to fix a record date for the
making of any other distribution (other than a non-extraordinary cash dividend
or distribution) to all holders of shares of its Common Stock; or

                                  Page 6 of 9
<PAGE>
 
          (b) to fix a record date for the issuance of rights or warrants (other
than this Warrant or replacements thereof) to all holders of shares of its
Common Stock entitling them to purchase any additional shares of its Common
Stock or any other securities; or

          (c) to effect any reclassification, subdivision or combination of
outstanding shares of its Common Stock; or

          (d) to effect any liquidation, dissolution or winding-up of the
Company;

then, and in any one or more of such cases, the Company shall cause notice
thereof to be mailed to the Warrant Holder at the Warrant Holder's last address
known to the Company at least 30 days prior to the date on which (i) the books
of the Company shall close, or a record shall be taken, for such dividend,
distribution or issuance of rights or warrants or (ii) such reclassification,
subdivision, combination, liquidation, dissolution or winding-up shall become
effective, as the case may be.

     9.   No Stockholder Rights or Liabilities.  This Warrant shall not entitle
          ------------------------------------                                 
the Warrant Holder to any voting rights or other rights as a stockholder of the
Company.  No provision hereof, in the absence of affirmative action by the
Warrant Holder to purchase shares of Common Stock, and no mere enumeration
herein of the rights or privileges of the Warrant Holder, shall give rise to any
liability of the Warrant Holder for the Warrant Price or as a stockholder of the
Company, whether such liability is asserted by the Company or by creditors of
the Company.

     10.  No Impairment.  The Company will not, by amendment of its Certificate
          -------------                                                        
of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of the
terms to be observed or performed under this Warrant by the Company, but will at
all times in good faith assist in carrying out all of the provisions of this
Warrant in order to protect the rights of the Warrant Holder against impairment
of the exercise rights provided for herein.

     11.  Lost, Stolen, Mutilated or Destroyed Warrant.  If this Warrant is
          --------------------------------------------                     
lost, stolen, mutilated or destroyed, the Company may, on such terms as to
indemnity or otherwise as it may in its discretion reasonably impose (which
shall, in the case of a mutilated Warrant, include the surrender thereof), issue
a new Warrant of like denomination and tenor as the Warrant so lost, stolen,
mutilated or destroyed.  Any such new Warrant shall constitute an original
contractual obligation of the Company, whether or not the allegedly lost,
stolen, mutilated or destroyed Warrant shall be at any time enforceable by
anyone.

                                  Page 7 of 9
<PAGE>
 
     12.  Notices.  All notices, requests and other communications required or
          -------                                                             
permitted to be given or delivered hereunder shall be in writing, and shall be
delivered, or shall be sent by national overnight courier service or by
certified or registered mail, postage prepaid and addressed, if to the Warrant
Holder, to the Warrant Holder at the address shown on the records of the Company
or at such other address as shall have been furnished to the Company by notice
from the Warrant Holder and, if to the Company, addressed to the Company at 1955
North Surveyor Avenue, Simi Valley, California 93063, Attention:  President, or
at such other address as shall have been furnished to the Warrant Holder by
notice from the Company.

     13.  Definitions.  Except as otherwise expressly defined herein,
          -----------                                                
capitalized terms used in this Warrant shall have the same meaning as defined in
that certain 7% Convertible Subordinated Note, dated April 24, 1995, as adjusted
by Allonge No. 1 thereto.

     IN WITNESS WHEREOF, WHITTAKER CORPORATION, has executed this Warrant on and
as of the day and year first above written.


                                      WHITTAKER CORPORATION


                                  By
                                      --------------------------
                                      [Title]


[Corporate Seal]



Attest:


__________________________ 
Secretary

                                  Page 8 of 9
<PAGE>
 
                       SUBSCRIPTION FORM TO BE EXECUTED
                         UPON EXERCISE OF THE WARRANT


                                                               Date_____________


To Whittaker Corporation:

     The undersigned, pursuant to the provisions set forth in the within
Warrant, hereby agrees to subscribe for and purchase _______ shares of Common
Stock covered by such Warrant, and herewith tenders $________ in full payment of
the purchase price for such shares.


                                                  HUGHES ELECTRONICS CORPORATION


                                                  By
                                                    ----------------------------

                                                  Address_______________________

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

                                  Page 9 of 9


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