ORBITAL SCIENCES CORP /DE/
S-8, 1995-11-22
GUIDED MISSILES & SPACE VEHICLES & PARTS
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        As filed with the Commission on November 21, 1995   File No. 33-

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   ----------
                                    FORM S-8
                            REGISTRATION STATEMENT 
                                     UNDER
                           THE SECURITIES ACT OF 1933
                                   ----------
                         ORBITAL SCIENCES CORPORATION 
               (Exact name of issuer as specified in its charter)

       Delaware                                            06-1209561    
(State or other jurisdiction of                         (IRS Employer
incorporation or organization)                        Identification No.)

21700 Atlantic Boulevard
                             Dulles, Virginia  20166               
          (Address of principal executive offices, including zip code)

                    MACDONALD, DETTWILER AND ASSOCIATES LTD.
          AMENDED AND RESTATED KEY EMPLOYEE SHARE OPTION PLAN - 1994,
                     KEY EMPLOYEE SHARE OPTION PLAN - 1993,
                   KEY EMPLOYEE SHARE OPTION PLAN - 1988, AND
                       EMPLOYEE SHARE OPTION PLAN - 1988
                           (Full title of the plans)

                                Leslie C. Seeman
            Senior Vice President, General Counsel and Secretary
                          Orbital Sciences Corporation
                            21700 Atlantic Boulevard
                            Dulles, Virginia 20166
                                (703) 406-5000                       
           (Name, address and telephone number of agent for service)

<TABLE>
<CAPTION>
                        CALCULATION OF REGISTRATION FEE

        Title of      Amount      Proposed    Proposed     Amount of
        Securities    to be       maximum     maximum      registration
        to be         registered  offering    aggregate    fee(2)
        registered                price per   offering     
                                  share(1)    price(1)
<S>     <C>           <C>         <C>         <C>          <C>

        Common Stock  328,399(3)  $6.14311    $2,017,391   $696
        par value,    
        $.01

</TABLE>

(1)  Represents the weighted average offering price of shares registered
     hereunder.  The offering price for each share registered hereunder, each
     of which is subject to an option on the date hereof, is the actual
     exercise price of such option. 
(2)  Registration fee consists of (a) $215.17 payable in respect of 101,412
     shares subject to options at an exercise price of $6.15 per share, (b)
     $39.02 payable in respect of 61,137 shares subject to options at an
     exercise price of $1.85 per share, (c) $215.12 payable in respect of
     81,085 shares subject to options at an exercise price of $7.69 per share,
     (d) $197.97 payable in respect of 75,603 shares subject to options at an
     exercise price of $7.59 per share, and (e) $28.54 payable in respect of
     9,162 shares subject to options at an exercise price of $9.03 per share.
(3)  Plus, pursuant to Rule 416(c), such indeterminate number of additional
     shares of Common Stock as may be required in the event of a stock
     dividend, reverse stock split or combination of shares, recapitalization
     or other change in the Company's capital stock.

                                  PAGE 1

Item 3.  Incorporation of Documents by Reference.

     Orbital Sciences Corporation (the "Registrant" or the "Company") hereby
incorporates the following documents herein by reference:

     (a)  The Company's Annual Report on Form 10-K for the fiscal year ended
          December 31, 1994;

     (b)   The Company's Quarterly Reports on Form 10-Q for the quarters ended
     March 31, 1995, June 30, 1995, and September 30, 1995;

     (c)   The Company's Report on Form 8-K dated November 2, 1995;

     (d)   The Company's Report on Form 8-K/A dated November 6, 1995; and

     (e)   The Description of the Company's Common Stock contained in the
     Company's Registration Statement on Form 8-A filed under Section 12 of the
     Securities and Exchange Act of 1934, as amended (the "Exchange Act") and
     all amendments or reports filed for the purpose of updating such
     description.

     All other documents filed by the Company pursuant to Section 13(a), 13(c),
14 or 15(d) of the Exchange Act subsequent to the date of this Registration
Statement and prior to the termination of the offering of the securities
offered hereby shall be deemed to be incorporated by reference in this
Registration Statement and to be a part hereof from the date of filing of such
documents.  Any statement contained herein or in a document incorporated or
deemed to be incorporated by reference herein shall be deemed to be modified or
superseded for purposes of this Registration Statement to the extent that a
statement contained herein or in any subsequently filed document that also is
or is deemed to be incorporated by reference herein modifies or supersedes such
statement.  Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Registration
Statement.

Item 6.   Indemnification of Directors and Officers.

     The Company is a Delaware Corporation.  Section 145 of the Delaware
General Corporation Law sets forth provisions that define the extent to which a
corporation organized under the laws of Delaware may indemnify directors,
officers, employees or agents.  Section 145 provides as follows:

          (a)  A corporation shall have power to indemnify any person who was
     or is a party or is threatened to be made a party to any threatened,
     pending or completed action, suit or proceeding, whether civil, criminal,
     administrative or investigative (other than an action by or in the right
     of the corporation) by reason of the fact that he is or was a director,
     officer, employee or agent of the corporation, or is or was serving at the
     request of the corporation as a director, officer, employee or agent of
     another corporation, partnership, joint venture, trust or other
     enterprise, against expenses (including attorneys' fees), judgments, fines
     and amounts paid in settlement actually and reasonably incurred by him in
     connection with such action, suit or proceeding if he acted in good faith
     and in a manner he reasonably believed to be in or not opposed to the best
     interests of the corporation, and, with respect to any criminal action or
     proceeding, had no reasonable cause to believe his conduct was unlawful. 
     The termination of any action, suit or proceeding by judgment, order,
     settlement, conviction, or upon a plea of nolo contendere or its
     equivalent, shall not, of itself, create a presumption that the person did
     not act in good faith and in a manner which he reasonably believed to be
     in or not opposed to the best interests of the corporation, and, with
     respect to any criminal action or proceeding, had reasonable cause to
     believe that his conduct was unlawful.

                                    PAGE 2

          (b)  A corporation shall have power to indemnify any person who was
     or is a party or is threatened to be made a party to any threatened,
     pending or completed action or suit by or in the right of the corporation
     to procure a judgment in its favor by reason of the fact that he is or was
     a director, officer, employee or agent of the corporation, or is or was
     serving at the request of the corporation as a director, officer, employee
     or agent of another corporation, partnership, joint venture, trust or
     other enterprise against expenses (including attorneys' fees) actually and
     reasonably incurred by him in connection with the defense or settlement of
     such action or suit if he acted in good faith and in a manner he
     reasonably believed to be in or not opposed to the best interests of the
     corporation and except that no indemnification shall be made in respect of
     any claim, issue or matter as to which such person shall have been
     adjudged to be liable to the corporation unless and only to the extent
     that the Court of Chancery or the court in which such action or suit was
     brought shall determine upon application that, despite the adjudication of
     liability but in view of all the circumstances of the case, such person is
     fairly and reasonably entitled to indemnity for such expenses which the
     Court of Chancery or such other court shall deem proper.

          (c)  To the extent that a director, officer, employee or agent of a
     corporation has been successful on the merits or otherwise in defense of
     any action, suit or proceeding referred to in subsections (a) and (b), or
     in defense of any claim, issue or matter therein, he shall be indemnified
     against expenses (including attorneys' fees) actually and reasonably
     incurred by him in connection therewith.

          (d)  Any indemnification under subsections (a) and (b) (unless
     ordered by a court) shall be made by the corporation only as authorized in
     the specific case upon a determination that indemnification of the
     director, officer, employee or agent is proper in the circumstances
     because he has met the applicable standard of conduct set forth in
     subsections (a) and (b).  Such determination shall be made (1) by the
     board of directors by a majority vote of a quorum consisting of directors
     who were not parties to such action, suit or proceeding, or (2) if such a
     quorum is not obtainable, or, even if obtainable a quorum of disinterested
     directors so directs, by independent legal counsel in a written opinion,
     or (3) by the stockholders.

          (e)  Expenses (including attorneys' fees) incurred by an officer or
     director in defending any civil, criminal, administrative, or
     investigative action, suit or proceeding may be paid by the corporation in
     advance of the final disposition of such action, suit or proceeding upon
     receipt of an undertaking by or on behalf of such director or officer to
     repay such amount if it shall ultimately be determined that he is not
     entitled to be indemnified by the corporation as authorized in this
     Section.  Such expenses (including attorneys' fees) incurred by other
     employees and agents may be so paid upon such terms and conditions, if
     any, as the board of directors deems appropriate.

          (f)  The indemnification and advancement of expenses provided by, or
     granted pursuant to, the other subsections of this section shall not be
     deemed exclusive of any other rights to which those seeking
     indemnification or advancement of expenses may be entitled under any by-
     law, agreement, vote of stockholders or disinterested directors or
     otherwise, both as to action in his official capacity and as to action in
     another capacity while holding such office.

          (g)  A corporation shall have power to purchase and maintain
     insurance on behalf of any person who is or was a director, officer,
     employee or agent of the corporation, or is or was serving at the request
     of the corporation as a director, officer, employee or agent of another
     corporation, partnership, joint venture, trust or other enterprise against
     any liability asserted against him and incurred by him in any such
     capacity, or arising out of his status as such, whether or not the
     corporation would have the power to indemnify him against such liability
     under the provisions of this section.

                                  PAGE 3

          (h)  For purposes of this Section, references to "the corporation"
     shall include, in addition to the resulting corporation, any constituent
     corporation (including any constituent of a constituent) absorbed in a
     consolidation or merger which, if its separate existence had continued,
     would have had power and authority to indemnify its directors, officers,
     and employees or agents, so that any person who is or was a director,
     officer, employee or agent of such constituent corporation, or is or was
     serving at the request of such constituent corporation as a director,
     officer, employee or agent of another corporation, partnership, joint
     venture, trust or other enterprise, shall stand in the same position under
     the provisions of this Section with respect to the resulting or surviving
     corporation as he would have with respect to such constituent corporation
     if its separate existence had continued.

          (i)  For purposes of this Section, references to "other enterprises"
     shall include employee benefit plans; references to "fines" shall include
     any excise taxes assessed on a person with respect to an employee benefit
     plan; and references to "serving at the request of the corporation" shall
     include any service as a director, officer, employee or agent of the
     corporation which imposes duties on, or involves services by, such
     director, officer, employee or agent with respect to an employee benefit
     plan, its participants, or beneficiaries; and a person who acted in good
     faith and in a manner he reasonably believed to be in the interest of the
     participants and beneficiaries of an employee benefit plan shall be deemed
     to have acted in a manner "not opposed to the best interests of the
     corporation" as referred to in this Section.

          (j)  The indemnification and advancement of expenses provided by, or
     granted pursuant to, this section shall, unless otherwise provided when
     authorized or ratified, continue as to a person who has ceased to be a
     director, officer, employee or agent and shall inure to the benefit of the
     heirs, executors and administrators of such a person.

     Paragraph Ten of the Company's Restated Certificate of Incorporation
provides that the Company shall, to the maximum extent permitted by Delaware
law, indemnify and, upon request, advance expenses to any person:

          ...who is or was a party or is threatened to be made a party to any
     threatened, pending or completed action, suit, proceeding or claim,
     whether civil, criminal, administrative or investigative, by reason of the
     fact that such person is or was or has agreed to be a director or officer
     of this Corporation or while a director or officer is or was serving at
     the request of this Corporation as a director, officer, partner, trustee,
     employee or agent of any corporation, partnership, joint venture, trust or
     other enterprise, including service with respect to employee benefit
     plans, against expenses (including attorney's fees and expenses),
     judgments, fines, penalties and amount paid in settlement incurred in
     connection with the investigation, preparation to defend or defense of
     such action, suit, proceeding or claim, provided, however, that the
     foregoing shall not require this Corporation to indemnify or advance
     expenses to any person in connection with any action, suit, proceeding,
     claim or counterclaim initiated by or on behalf of such person.  Any
     person seeking indemnification under this Paragraph 10 shall be deemed to
     have met the standard of conduct required for such indemnification unless
     the contrary shall be established.

     Section 102(b)(7) of the Delaware General Corporation Law permits
corporations to eliminate or limit the personal liability of their directors by
adding to the Certificate of Incorporation a provision eliminating or limiting
the personal liability of a director to the corporation or its stockholders for
monetary damages for breach of fiduciary duty as a director, provided that such
provision shall not eliminate or limit the liability of a director for (a) any
breach of any director's duty of loyalty to the corporation or its
stockholders, (b) acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (c) payment of dividends
or repurchases or redemptions of stock other than from lawfully available
funds, or (d) any transaction from which the director derived an improper
personal benefit.  Paragraph Nine of the Company's Restated Certificate of
Incorporation provides that no director of the Company shall be liable to the
Company or its stockholders for 

                                  PAGE 4

monetary damages for breach of fiduciary duty as a director, except to the 
extent that exculpation from liability is not permitted under the 
Delaware General Corporation Law as in effect at the time
such liability is determined.
                                 
     In addition, the Company has entered into substantially identical
indemnification agreements with each of its Directors and Executive Officers
and certain other officers.  The Company has agreed, to the full extent
permitted by the Delaware General Corporation Law, as amended from time to
time, to indemnify each indemnitee against all loss and expense incurred by the
indemnitee because he was, is or is threatened to be made a party to any
completed, pending or threatened action, suit or proceeding, whether civil,
criminal, administrative or investigative, by reason of the fact that he was a
director, officer, employee or agent of the Company or any of its affiliates,
or because the Company has a right to judgment in its favor because of his
position with the Company or any of its affiliates.  The indemnitee will be
indemnified so long as he acted in good faith and in a manner reasonably
believed by him to be in or not opposed to the Company's best interests.  The
agreement further provides that the indemnification thereunder is not exclusive
of any other rights the indemnitee may have under the Company's Restated
Certificate of Incorporation, By-Laws or any agreement or vote of stockholders,
nor may the Restated Certificate of Incorporation or By-Laws be amended to
effect adversely the rights of any indemnitee.

Item 8.  Exhibits.

     The following exhibits are filed as a part of this Registration Statement. 
Where such filing is made by incorporation by reference (I/B/R) to a previously
filed statement or report, such statement or report is identified in
parentheses.

Exhibit
No.                          Description                        Page No.

3.1                 Restated Certificate of                      I/B/R
                    Incorporation (Exhibit 3.1 to
                    the Company's Registration
                    Statement on Form S-1 (File
                    Number 33-33453) filed on
                    February 9, 1990 and effective
                    on April 24, 1990).

3.2                 By-Laws of the Company (Exhibit              I/B/R
                    3 to the Company's Quarterly
                    Report on Form 10-Q for the
                    fiscal quarter ended September
                    30, 1995).

4.1                 Specimen Certificate of Common               I/B/R
                    Stock (Exhibit 4.1 to the
                    Company's Registration
                    Statement on Form S-1 (File
                    Number 33-33453) filed on
                    February 9, 1990 and effective
                    on April 24, 1990).

4.2                 Orbital Sciences Corporation                 I/B/R
                    1990 Stock Option Plan (Exhibit
                    4.4 to the Company's
                    Registration Statement on Form
                    S-8 (File Number 33-47789)
                    filed on and effective on May
                    11, 1992).

4.3                 Orbital Sciences Corporation                 I/B/R
                    1990 Stock Option Plan for Non-
                    Employee Directors (Exhibit 4.5
                    to the Company's Registration
                    Statement on Form S-8 (File
                    Number 33-47789) filed on and
                    effective on May 11, 1992).

                             PAGE 5

4.4                 Form of Indenture dated as of                I/B/R
                    January 26, 1993 among the
                    Company and Security Trust
                    Company, National Association
                    as Trustee (Exhibit 4.4 to the
                    Company's Annual Report on Form
                    10-K for the fiscal year ended
                    December 31, 1992).

4.5                 Form of 6 3/4% Convertible                   I/B/R
                    Subordinated Debenture due 2003
                    (Exhibit 4.5 to the Company's
                    Annual Report on Form 10-K for
                    the fiscal year ended December
                    31, 1992).

4.6                 MacDonald, Dettwiler and
                    Associates Ltd. Amended and
                    Restated Key Employee Share
                    Option Plan - 1994.

4.7                 MacDonald, Dettwiler and
                    Associates Ltd. Key Employee
                    Share Option Plan - 1993.

4.8                 MacDonald, Dettwiler and
                    Associates Ltd. Key Employee
                    Share Option Plan - 1988, as
                    amended by Amendment No. 1
                    dated November 17, 1995.

4.9                 MacDonald, Dettwiler and
                    Associates Ltd. Employee Share
                    Option Plan - 1988, as amended
                    by Amendment No. 1 dated
                    November 17, 1995.

4.10                Form of Replacement Option.

5                   Opinion of Ropes & Gray.

23.1                Consent of Ropes & Gray
                    (contained in Exhibit 5).

23.2                Consent of KPMG Peat Marwick
                    LLP.

23.3                Consent of KPMG Peat Marwick
                    Thorne.

24                  Powers of Attorney (contained
                    on the Signature Page of this
                    Registration Statement).

Item 9.   Undertakings.

     (a)  The undersigned Registrant hereby undertakes:

          (1)  to file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement; (i) to include
any prospectus required by Section 10(a)(3) of the Securities Act of 1933; (ii)
to reflect in the prospectus any facts or events arising after the effective
date of the registration statement (or the most recent post-effective amendment
thereof), which, individually or in the aggregate, represent a fundamental
change in the information set forth in the registration statement; and (iii) to
include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to
such information in the registration statement; provided, however, that
paragraphs (a)(1)(i) and (ii) shall not apply if the information required to be
included in a post-effective amendment by those paragraphs is contained in
periodic reports filed by the registrant pursuant to section 13 or

                                   PAGE 6

section 15(d) of the Securities Exchange Act of 1934 that are incorporated by
reference in the registration statement.

          (2)  that, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to
be a new registration statement relating to the securities offered herein, and
the offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof;

          (3)  to remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

     (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable.  In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.

                                   PAGE 7

                                 SIGNATURES


          Pursuant to the requirements of the Securities Act of 1933, the
Company certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the County of Loudoun, the Commonwealth of Virginia, on
this 17th day of November, 1995.

                                      ORBITAL SCIENCES CORPORATION


                                      By /s/ David W. Thompson                 
                                      David W. Thompson, Chairman
                                      of the Board, President and
                                      Chief Executive Officer


          Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and as of the 17th day of November, 1995.  Each person whose
signature appears below hereby authorized each of David W. Thomson, Leslie C.
Seeman and Mary Ellen Seravalli and appoints each of them singly his attorney-
in-fact, each with full power of substitution, to execute in his name, place
and stead, in any and all capacities, any post-effective amendment to this
Registration Statement and file the same, with exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission,
making such further changes in this Registration Statement as the Company deems
appropriate.

         Signature                                 Title

/s/ David W. Thompson                  Chairman of the Board, President
David W. Thompson                      and Chief Executive Officer; Director


/s/ Carlton B. Crenshaw                Senior Vice President/Finance and
Carlton B. Crenshaw                    Administration; Chief Financial Officer


/s/ Jeffrey V. Pirone                  Vice President and Controller
Jeffrey V. Pirone


/s/ Bruce W. Ferguson                  Executive Vice President and General
Bruce W. Ferguson                      Manager/Communications and Information 
                                       Systems Group; Director


/s/ James R. Thompson                  Executive Vice President and General
James R. Thompson                      Manager/Launch Systems Group; Director

                                  PAGE 8 

/s/ Jack A. Frohbieter                 Executive Vice President and General
Jack A. Frohbieter                     Manager/Space and Electronics Systems 
                                       Group; Director

/s/ Fred C. Alcorn                     Director
Fred C. Alcorn

/s/ Kelly H. Burke                     Director
Kelly H. Burke

/s/ Daniel J. Fink                     Director
Daniel J. Fink

/s/ Lennard A. Fisk                    Director
Lennard A. Fisk

/s/ Jack L. Kerrebrock                 Director
Jack L. Kerrebrock

/s/ J. Paul Kinloch                    Director
J. Paul Kinloch

/s/ Douglas S. Luke                    Director
Douglas S. Luke

/s/ John L. McLucas                    Director
John L. McLucas

/s/ Harrison H. Schmitt                Director
Harrison H. Schmitt

/s/ Scott L. Webster                   Director
Scott L. Webster

                                 PAGE 9

                              INDEX TO EXHIBITS


          Exhibit                                               Sequentially
          Number             Exhibits                           Numbered Page  

                                                               
          3.1          Restated Certificate of Incorporation
                       (Exhibit 3.1 to the Company's             I/B/R
                       Registration Statement on Form S-1
                       (File Number 33-33453) filed on
                       February 9, 1990 and effective on
                       April 24, 1990).

          3.2          By-Laws of the Company (Exhibit 3 to      I/B/R
                       the Company's Quarterly Report on Form
                       10-Q for the fiscal quarter ended
                       September 30, 1995).

          4.1          Specimen Certificate of Common Stock      I/B/R
                       (Exhibit 4.1 to the Company's
                       Registration Statement on Form S-1
                       (File Number 33-33453) filed on
                       February 9, 1990 and effective on
                       April 24, 1990).

          4.2          Orbital Sciences Corporation 1990         I/B/R
                       Stock Option Plan (Exhibit 4.4 to the
                       Company's Registration Statement on
                       Form S-8 (File Number 33-47789) filed
                       on and effective on May 11, 1992).

          4.3          Orbital Sciences Corporation 1990         I/B/R
                       Stock Option Plan for Non-Employee
                       Directors (Exhibit 4.5 to the
                       Company's Registration Statement on
                       Form S-8 (File Number 33-47789) filed
                       on and effective on May 11, 1992).

          4.4          Form of Indenture dated as of January     I/B/R
                       26, 1993 among the Company and
                       Security Trust Company, National
                       Association, as Trustee (Exhibit 4.4
                       to the Company's Annual Report on Form
                       10-K for the fiscal year ended
                       December 31, 1992).

          4.5          Form of 6 3/4% Convertible Subordinated      I/B/R
                       Debenture due 2003 (Exhibit 4.5 to the
                       Company's Annual Report on Form 10-K
                       for the fiscal year ended December 31,
                       1992).

          4.6          MacDonald, Dettwiler and Associates
                       Ltd. Key Employee Share Option Plan -
                       1994.

          4.7          MacDonald, Dettwiler and Associates
                       Ltd. Key Employee Share Option Plan -
                       1993.

          4.8          MacDonald, Dettwiler and Associates
                       Ltd. Key Employee Share Option Plan -
                       1988, as amended by Amendment No. 1
                       dated November 17, 1995.

          4.9          MacDonald, Dettwiler and Associates
                       Ltd. Employee Share Option Plan -
                       1988, as amended by Amendment No. 1
                       dated November 17, 1995.

          4.10         Form of Replacement Option.

                                   PAGE 1

          5            Opinion of Ropes & Gray.

          23.1         Consent of Ropes & Gray (contained in
                       Exhibit 5).

          23.2         Consent of KPMG Peat Marwick LLP.

          23.3         Consent of KPMG Peat Marwick Thorne.

          24           Powers of Attorney (contained on the
                       Signature Page of this Registration
                       Statement).

                                  PAGE 2


                    MACDONALD, DETTWILER AND ASSOCIATES LTD.

        AMENDED AND RESTATED KEY EMPLOYEE SHARE OPTION PLAN ("KESOP 94")


1.   Purposes of the Plan

     The purposes of the Key Employee Share Option Plan ("KESOP 94") of
     MacDonald, Dettwiler and Associates Ltd. (the "Plan") are (i) to permit
     key managers of MacDonald, Dettwiler and Associates Ltd. (the
     "Corporation") and of its subsidiaries options ("Options") to purchase
     common shares ("Shares") of the Corporation thereby encouraging them to
     obtain an increased proprietary interest in the enterprise and provide an
     additional incentive to further its growth and development, (ii) to assist
     the Corporation in attracting and retaining executives with experience and
     ability, and (iii) align their thinking with that of the shareholders.

2.   Administration

     Subject to sections 3 and 4 below, the Plan shall be administered by the
     Compensation Committee (the "Committee") of the Board of Directors of the
     Corporation; none of whom shall be employees of the Corporation or its
     subsidiaries.  The Committee shall have full and complete authority to
     interpret the Plan to prescribe such rules and regulations (including
     those with respect to the holding of meetings by telephone) and to make
     such other determinations as it deems necessary or desirable for the
     administration of the Plan.  A majority of the Committee shall constitute
     a quorum.  Acts approved in writing by all members shall be valid acts of
     the Committee.

2.   Shares subject to the Plan

     The Board of Directors of the Corporation shall authorize from time to
     time the issue of such number of shares of the Corporation pursuant to the
     Plan as may be necessary to permit the Corporation to meet its obligations
     under the Plan or may satisfy its obligations under the Plan by way of
     Shares purchased by or through the market.  Subject to any adjustment
     provided for in section 10, the aggregate number of Shares covered by
     Options granted to Optionees (as hereinafter defined), with respect to any
     year, pursuant to the Plan shall not, in any case, ever exceed (i) if the
     total amount of Shares which may be reserved for issuance and held under
     option under the Plan or any other plans granted by the Corporation
     exceeds 10% of the issued and outstanding common shares of the
     Corporation, such numbers of common shares as may be approved by the
     shareholders of the Corporation; or (ii) the ceiling per year set from
     time to time by the Board of Directors of the Corporation.

                                  PAGE 1
4.   Grant of Options

     After a consultation with the Chief Executive Officer and subject to
     confirmation by the Board of Directors the Committee shall from time to
     time, on an annual basis, or otherwise as may be determined by the Board
     of Directors, choose from among key managers those managers ("Optionees")
     to whom it recommends that Options should be granted and the number of
     Shares which it recommends be covered by each such grant.  The date of
     confirmation by the Board of Directors of the grant of an Option is
     hereinafter referred to as the effective date ("Effective Date").  Each
     Option shall be confirmed by an instrument in writing issued by the
     Corporation to the Optionee.  Any Optionee, at the time of granting of an
     Option, may hold more than one Option.

5.   Subscription Price

     The subscription price for each Share covered by an Option shall be
     established by the Committee at 100% of the market value (as hereinafter
     defined) of a Share on the last trading day prior to the Effective Date.

6.   Option Period

     Each Option shall be exercisable by the Optionee during a period ("Option
     Period") of three years from the date of vesting of any options or such
     other period as is established by the Committee at the time of grant
     thereof, which in any event shall be not more than ten years after the
     Effective Date, and also provided that:

     6.1  in the event of the death of the Optionee while in the employ of the
          Corporation or any subsidiary, the Option Period for Options
          outstanding at the time of death for which the right to exercise had
          accrued shall terminate 12 months after the date of death (but not
          after the termination date of the Option first established by the
          Committee), and the Optionee's estate shall have the right prior to
          such termination to exercise the Options at any time with respect to
          all or, from time to time, with respect to any part of the Shares
          which the Optionee had not exercised pursuant to such Options. 
          Options for which the right to exercise had not yet accrued may also
          be similarly exercised by the Optionee's estate;

     6.2  if an Optionee's employment terminates, other than by death or
          disability, the Option Period for Options then outstanding and vested
          shall terminate 30 days after the date of termination and the
          Optionee (or the Optionee's estate in the event of death after
          termination) shall have the right prior to such termination to
          exercise the Options which are vested with respect to all or, from
          time to time, with respect to any part of the Shares which the
          Optionee had not exercised 

                                     PAGE 2

          pursuant to such Options which are vested;
          all unvested Options shall terminate on the date of any such
          termination; and

     6.3  if an Optionee's employment terminates for reason of disability, the
          Option Period for Options then outstanding shall vest and terminate
          on the dates as set forth in the Option as if the Optionee were still
          an employee.

All rights under an Option unexercised at the termination of the Option Period
shall be forfeited.

7.   Exercise of Option

     The Committee may determine at the Effective Date to permit exercise of an
     Option at certain times during the Option Period and to permit vesting of
     the Option in varying amounts during the Option Period and if not so
     determined shall vest as to 20% immediately and as to the remaining 80%
     shall vest in four equal installments in the four succeeding years of the
     Option.  An Option may only be exercised after accrual or vesting (with
     respect to that portion vested), in whole at any time, or in part from
     time to time.  The subscription price for Shares shall be paid in full in
     cash at the time of exercise of the Option.

8.   Delivery of Share Certificates

     On the exercise of an Option, the Corporation shall deliver to the
     Optionee or, in the event of death of the Optionee, to the Optionee's
     estate, certificates for the resulting Shares registered in the name of
     the Optionee.

9.   Non-assignable

     No Option or any interest therein shall be assignable by the Optionee
     otherwise than by will or the laws governing the devolution of property in
     the event of death.  During the lifetime of the Optionee the Option shall
     be exercisable only by the Optionee or the Optionee's legal
     representative.

10.   Effects of Alteration of Share Capital

     In the event that the outstanding Shares of the Corporation shall be
     changed into or exchanged for a different number or kind of securities of
     the Corporation or of another corporation, whether through an arrangement,
     amalgamation or other similar statutory procedure, or a share
     recapitalization, subdivision or consolidation, then there shall be
     substituted for each Share subject to any such Option, for each Share
     authorized for issuance pursuant to the Plan but not yet covered by an
     Option and the maximum number of shares issuable with respect to any year,
     the number and kind of securities 

                                       PAGE 3

     into which each outstanding share shall be so changed or for which each 
     such Share shall be exchanged.

     In the event there shall be any change, other than as specified about in
     this section, in the number oR kind of outstanding Shares of the
     Corporation or of any securities into which such Shares shall have been
     changed or for which it shall have been exchanged, then an equitable
     adjustment shall be made in the number or kind of shares thereto for
     authorized for issuance pursuant to the Plan but not yet covered by an
     Option, of the Shares then subject to an Option or Options, and in the
     maximum number of Shares issuable with respect to any year, such
     adjustment to be reasonably determined by the Committee and to be
     effective and binding for all purposes.

     In the case of any such substitution or adjustment as provided for in this
     section, the Option price in each Share Option agreement for each Share
     covered thereby prior to such substitution or adjustment will be
     proportionately and appropriately varied.  Such variation shall generally
     require that the number of securities covered by the Option after the
     relevant event multiplied by the revised Option price shall equal the
     number of shares covered by the Option prior to the relevant event
     multiplied by the original Option price.  No adjustment or substitution
     provided for in this section shall require the Corporation in any Share
     Option agreement to issue a fractional Share and the total substitution or
     adjustment with respect to each Share Option agreement shall be limited
     accordingly.

11.  Amendment and Termination

     The Board of Directors of the Corporation may from time to time amend,
     suspend or terminate the Plan in whole or in part.  No such amendment,
     suspension or termination may, without the consent of any Optionee holding
     Options then issued and outstanding and unexercised, adversely affect the
     right of such Optionee.

12.  Listing

     The obligation of the Corporation to issue Shares pursuant to the Plan
     shall be subject to the condition that listing or authorization for
     listing of such Shares on the stock exchange on which the shares are
     listed (the "Exchange"), if required, shall have been obtained.

13.  Certain Definitions

     For purposes of the Plan:

     "key managers" shall include the officers or other managers of the
     Corporation, or of any subsidiary of the Corporation, who in the opinion
     of the Committee have 
                                    PAGE 4

     demonstrated a capacity for contributing in a
     substantial measure to the successful performance of the Corporation or of
     such subsidiaries;

     "market value" shall mean the closing price for a board lot of Shares on
     the principal Exchange on which the Shares are listed on the relevant day,
     or if at least one board lot of  Shares shall not have been traded on that
     day, on the next preceding day for which at least one board lot was so
     traded and if the Shares are not listed on any Exchange shall mean the
     market value as established by the Board of Directors at the date of the
     agreement;

     "retirement" shall mean retirement in accordance with the provisions of
     the retirement plan of the Corporation or subsidiary covering the Optionee
     and, if the Optionee is not covered by such a plan, as determined by the
     Committee; and

     "subsidiary" shall mean any corporation a majority of whose shares
     normally entitled to vote in electing directors is owned directly or
     indirectly by the Corporation or by other subsidiaries.

                                    PAGE 5


                 MACDONALD, DETTWILER AND ASSOCIATES LTD.

                KEY EMPLOYEE SHARE OPTION PLAN ("KESOP 93")

1.   Purposes of the Plan

     The purposes of the Key Employee Share Option Plan ("KESOP 93") of
     MacDonald, Dettwiler and Associates Ltd. (the "Plan") are (i) to permit
     key managers of MacDonald, Dettwiler and Associates Ltd. (the
     "Corporation") and of its subsidiaries options ("Options") to purchase
     common shares ("Shares") of the Corporation thereby encouraging them to
     obtain an increased proprietary interest in the enterprise and provide an
     additional incentive to further its growth and development, (ii) to assist
     the Corporation in attracting and retaining executives with experience and
     ability, and (iii) align their thinking with that of the shareholders.

2.   Administration

     Subject to sections 3 and 4 below, the Plan shall be administered by the
     Compensation Committee (the "Committee") of the Board of Directors of the
     corporation; none of whom shall be employees of the Corporation or its
     subsidiaries.  The Committee shall have full and complete authority to
     interpret the Plan to prescribe such rules and regulations (including
     those with respect to the holding of meetings by telephone) and to make
     such other determinations as it deems necessary or desirable for the
     administration of the Plan.  A majority of the Committee shall constitute
     a quorum.  Acts approved in writing by all members shall be valid acts of
     the Committee.

3.   Shares subject to the Plan

     The Board of Directors of the Corporation shall authorize from time to
     time the issue of such number of shares of the Corporation pursuant to the
     Plan as may be necessary to permit the Corporation to meet its obligations
     under the Plan or may satisfy its obligations under the plan by way of
     Shares purchased by or through the market.  Subject to any adjustment
     provided for in section 10, the aggregate number of Shares covered by
     Options granted to Optionees (as hereinafter defined), with respect to any
     year, pursuant to the Plan shall not, in any case, ever exceed (i) the
     total amount of Shares which may be held under option under the guidelines
     of any stock exchange on which the Shares of the Corporation are listed;
     and (ii) the ceiling per year set from time to time by the Board of
     Directors of the Corporation.

4.   Grant of Options

     After a consultation with the Chief Executive Officer and subject to
     confirmation by the Board of Directors the Committee shall from time to
     time, on an annual basis, or 

                                      PAGE 1

     otherwise as may be determined by the Board of Directors, choose from among
     key managers those managers ("Optionees") to whom it recommends that 
     Options should be granted and the number of Shares which it recommends 
     be covered by each such grant.  The date of confirmation by the Board 
     of Directors of  the grant of an Option is hereinafter referred to as 
     the effective date ("Effective Date").  Each Option shall be confirmed 
     by an instrument in writing issued by the Corporation to the Optionee.
     Any Optionee, at the time of granting of an Option, may hold more than 
     one Option.

5.   Subscription Price

     The subscription price for each Share covered by an Option shall be
     established by the Committee at 100% of the market value (as hereinafter
     defined) of a Share on the last trading day prior to the Effectie Date.

6.   Option Period

     Each Option shall be exercisabale by the Optionee during a period ("Option
     Period") established by the Committee which shall terminate not later than
     ten years after the Effective Date, and also provided that:

          6.1  in the event of the death of the Optionee while in the employ of
               the Corporation or any subsidiary, the Option Period for Options
               outstanding at the time of death for which the right to exercise
               had accrued shall terminate 12 months after the date of death
               (but not after the termination date of the Option first
               established by the Committee), and the Optionee's estate shall
               have the right prior to such termination to exercise the Options
               at any time with respect to all or, from time to time, with
               respect to any part of the Shares which the Optionee had not
               exercised pursuant to such Options.  Options for which the right
               to exercise had not yet accrued may also be similarly exercised
               by the Optionee's estate;

          6.2  if an Optionee's employment terminates, other than by death or
               disability, the Option Period for Options then outstanding and
               vested shall terminate 30 days after the date of termination and
               the Optionee (or the Optionee's estate in the event of death
               after termination) shall have the right prior to such
               termination to exercise the Options which are vested with
               respect to all or, from time to time, with respect to any part
               of the Shares which the Optionee had not exercised pursuant to
               such Options which are vested; all unvested Options shall
               terminate on the date of any such termination; and

                                    PAGE 2

          6.3  if an Optionee's employment terminates for reason of disability,
               the Option Period for Options then outstanding shall vest and
               terminate on the dates as set forth in the Option as if the
               Optionee were still an employee.

All rights uner an Option unexercised at the termination of the Option Period
shall be forfeited.

7.   Exercise of Option

     The Committee may determine at the Effective Date to permit exercise of an
     Option at certain times during the Option Period and to permit vesting of
     the Option in varying amounts during the Option Period and if not so
     determined shall vest as to 20% immediately and as to the remaining 80%
     shall vest in four equal instalments in the four succeeding years of the
     Option.  An Option may only be exercised after accrual or vesting (with
     respect to that portion vested), in whole at any time, or in part from
     time to time.  The subscription price for Shares shall be paid in full in
     cash at the time of exercise of the Option.

8.   Delivery of Share Certificates

     On the exercise of an Option, the Corporation shall deliver to the
     Optionee or, in the event of death of the Optionee, to the Optionee's
     estate, certificates for the resulting Shares registered in the name of
     the Optionee.

9.   Non-assignable

     No Option or any interest therein shall be assignable by the Optionee
     otherwise than by will or the laws governing the devolution of property in
     the event of death.  During the lifetime of the Optionee the Option shall
     be exercisable only by the Optionee or the Optionee's legal
     representative.

10.   Effects of Alteration of Share Capital

     In the event that the outstanding Shares of the Corporation shall be
     changed into or exchanged for a different number or kind of securities of
     the Corporation or of another corporation, whether through an arrangement,
     amalgamation or other similar statutory procedure, or a share
     recapitalization, subdivision or consolidation, then there shall be
     substituted for each Share subject to any such Option, for each Share
     authorized for issuance pursuant to the Plan but not yet covered by an
     Option and the maximum number of shares issuable with respect to any year,
     the number and kind of securities into which each outstanding share shall
     be so changed or for which each such Share shall be exchanged.

                                   PAGE 3

     In the event there shall be any change, other than as specified about in
     this section, in the number or kind of outstanding Shares of the
     Corporation or of any securities into which such Shares shall have been
     changed or for which it shall have been exchanged, then an equitable
     adjustment shall be made in the number or kind of shares thereto for
     authorized for issuance pursuant to the Plan but not yet covered by an
     Option, of the Shares then subject to an Option or Options, and in the
     maximum number of Shares issuable with respect to any year, such
     adjustment to be reasonably determined by the Committee and to be
     effective and binding for all purposes.

     In the case of any such substitution or adjustment as provided for in this
     section, the Option price in each Share Option agreement for each Share
     covered thereby prior to such substitution or adjustment will be
     proportionately and appropriately varied.  Such variation shall generally
     require that the number of securities covered by the Option after the
     relevant event multiplied by the revised Option price shall equal the
     number of shares covered by the Option prior to the relevant event
     multiplied by the original Option price.  No adjustment or substitution
     provided for in this section shall require the Corporation in any Share
     Option agreement to issue a fractional Share and the total substitution or
     adjustment with respect to each share Option agreement shall be limited
     accordingly.

11.  Amendment and Termination

     The Board of Directors of the Corporation may from time to time amend,
     suspend or terminate the Plan in whole or in part.  No such amendment,
     suspension or termination may, without the consent of any Optionee holding
     Options then issued and outstanding and unexercised, adversely affect the
     right of such Optionee.

12.  Listing

     The obligation of the Corporation to issue Shares pursuant to the Plan
     shall be subject to the condition that listing or authorization for
     listing of such Shares on the stock exchange on which the shares are
     listed (the "Exchange"), if required, shall have been obtained.

13.  Effective Date of Plan

     The effective date of the Plan shall be June 1, 1993.

14.  Certain Definitions

     For purposes of the Plan:

                                 PAGE 4

     "key managers" shall include the officers or other managers of the
     Corporation, or of any subsidiary of the Corporation, who in the opinion
     of the Committee have demonstrated a capacity for contributing in a
     substantial measure to the successful performance of the Corporation or of
     such subsidiaries;

     "market value" shall mean the closing price for a board lot of Shares on
     the principal Exchange on which the Shares are listed on the relevant day,
     or if at least one board lot of Shares shall not have been traded on that
     day, on the next preceding day for which at least one board lot was so
     traded and if the Shares are not listed on any Exchange shall mean the
     market value as established by the Board of Directors at the date of the
     agreement;

     "retirement" shall mean retirement in accordance with the provisions of
     the retirement plan of the Corporation or subsidiary covering the Optionee
     and, if the Optionee is not covered by such a plan, as determined by the
     Committee; and

     "subsidiary" shall mean any corporation a majority of whose shares
     normally entitled to vote in electing directors is owned directly or
     indirectly by the Corporation or by other subsidiaries.

                       KEY EMPLOYEE SHARE OPTION PLAN

          WHEREAS the board of directors of the Company approved the
establishment of the Key Employee Share Option Plan - 1994 (the "Plan");

          AND WHEREAS The Toronto Stock Exchange have requested an annulment to
the Plan.

          NOW THEREFORE be it resolved that the Plan be amended by deleting
paragraph 3 and replacing it with the following:

"3.  Shares subject to the Plan

     The Board of Directors of the Corporation shall authorize from time to
     time the issue of such number of shares of the Corporation pursuant to the
     Plan as may be necessary to permit the Corporation to meet its obligations
     under the Plan or may satisfy its obligations under the Plan by way of
     Shares purchased by or through the market.  Subject to any adjustment
     provided for in section 10, the aggregate number of Shares covered by
     Options granted to Optionees (as hereinafter defined), with respect to any
     year, pursuant to the Plan shall not, in any case, ever exceed (i) the
     total amount of Shares which may be reserved for issuance and held under
     option under this Plan or any other plans granted by the Corporation, 10%
     of the issued and outstanding Shares of or such other number as may be
     established under the guidelines of any stock 
  
                                        PAGE 5

     exchange on which the Shares of the Corporation are listed; and (ii) the 
     ceiling per year set from time to time by the Board of Directors of the
     Corporation."

                                        PAGE 6



                                                                    Exhibit 4.8
                                                   Dated for reference purposes
                                                         only - August 31, 1988


                    MACDONALD, DETTWILER AND ASSOCIATES LTD.

                 1988 KEY EMPLOYEE SHARE OPTION PLAN (MSOP-88)

                             SECTIN 1 - DEFINITIONS

This 1988 Key Employee Share Option Plan (MSOP-88) of MacDonald, Dettwiler and
Associates Ltd. established the 11th day of March, 1988 with effect from and
after April 1, 1988.

     1.1  In the Plan, the following words shall have the following meaning:

          "Common Shares" means the common voting shares of MacDonald Dettwiler
          as from time to time constituted;

          "Company" means MacDonald Dettwiler, or any subsidiary, all of whose
          voting shares are owned by MacDonald Dettwiler;

          "Directors" means the Board of Directors of MacDonald Dettwiler as
          from time to time constituted;

          "Employee" means any person who is a permanent employee of the
          Company, who works for at least 25 hours per week;

          "ESOP-88" means the 1988 Employee Share Option Plan of MacDonald
          Dettwiler dated March 11, 1988, as from time to time amended;

          "Key Employee" means those Employees who are key Employees of the
          Company as determined by the Directors;

          "Leaving Date" means the earliest date on which the Key Employee
          completes his service and ceases to be employed with the Company
          (whether caused voluntarily by resignation or involuntarily by
          dismissal or disability), or on which the Key Employee dies or on
          which his services are otherwise terminated;

          "MacDonald Dettwiler" means MacDonald, Dettwiler and Associates Ltd.;

                                      PAGE 1

          "MSOP-II" means the Management Share Option Plan II of MacDonald
          Dettwiler dated April 1, 1985, as from time to time amended;

          "Option" means the right to acquire Option Shares pursuant hereto;

          "Option Shares" means the number of Common Shares of MacDonald
          Dettwiler for which Options are granted as determined in Article 3
          hereof;

          "Plan" means this Key Employee Share Option Plan (MSOP-88), as from
          time to time amended;

          "Secretary" means the secretary of MacDonald Dettwiler;

          "Subscription" means for any Key Employee, the number of Option
          Shares subscribed for;

          "Subscription Price" for each of the fiscal years means the price as
          established pursuant to Section 5 hereof;

          "TSE" means The Toronto Stock Exchange.

                                 SECTION 2 - ELIGIBILITY

     2.1  No person may be a Key Employee or be granted an Option hereunder to
          acquire Option Shares unless that person is an Employee.

     2.2  The Directors shall select those Employees who are entitled to become
          Key Employees for the purpose of each fiscal year during the term of
          this Plan.  The Directors may in their discretion appoint a committee
          of not less than three persons (of which not more than one person may
          be an Employee) to consider and, if thought fit, approve such
          recommendations, which approval shall be deemed to be designated by
          the Directors.

                       SECTIN 3 - NUMBER OF OPTION SHARES AND TERM

     3.1  The number of Option Shares available for grant under this Plan and
          MSOP II shall not exceed 400,000 Common Shares, the amount to be
          granted in each fiscal year to be as determined by the Directors.

     3.2  The term of this Plan shall be 5 years from March 31, 1988 to March
          31, 1992 provided, however, that with respect to any granted Option
          same may have a term permitting vesting in excess of the 5 years and
          with respect to any vested 
       
                                      PAGE 2

          Option same may have a term permitting exercise thereof in excess of 
the 5 years.

                                SECTION 4 - GRANT OF OPTION

     4.1  The Company shall grant Options to Key Employees in respect of each
          fiscal year of the Company commencing with the fiscal year ending
          March 31, 1988 to and including the fiscal year ending March 31, 1992
          in the manner as hereafter provided.

     4.2  Each Key Employee, for each fiscal year that he is a Key Employee
          shall, subject to compliance with the terms hereof, be granted an
          Option to purchase such number of Option Shares as determined by the
          Directors in each fiscal year of the Plan.  The Key Employee will be
          entitled to earn or be vested in the amount of Option Shares granted
          to a Key Employee under this Plan in equal annual instalments over a
          5 year period after the date of the grant.

     4.3  Any Option hereunder is not transferable.

                              SECTION 5 - SUBSCRIPTION PRICE

     4.1  The Subscription Price for any Option Shares granted hereunder shall
          be:

          (a)  if the Common Shares are not listed on the TSE, the price as
               determined by the Directors; or

          (b)  if the Common Shares are listed on the TSE, the average closing
               market price of the Common Shares on the TSE for the 10 days
               preceding the date of the grant less the maximum discount
               permitted by the TSE.

          Notwithstanding the foregoing, if any Option Shares have been granted
          hereunder and have not vested in the Key Employee prior to the
          listing of the Common Shares on the TSE, the Subscription Price may
          be changed to be the Subscription Price permitted by the TSE.

                           SECTION 6 - VESTING OF OPTION SHARES

     5.1  Any Option granted to a Key Employee and Subscription for Option
          Shares hereunder by that Key Employee shall vest in and shall entitle
          that Key Employee to purchase and pay for the Option Shares contained
          in any Option and subscribed for by the Key Employee at the
          respective Subscription Price therefore, upon the Key Employee
          achieving objectives specified by the Directors such that if the
          actual achievement to the objective is 100% or more, 

                                       PAGE 3

          the Key Employee shall be vested in 100% of the Option Shares 
          available under his grant for that fiscal year; if the actual 
          achievement to the objective is 50% the Key Employee will be vested 
          in 25% of the Option Shares available under his grant for that 
          fiscal year; if the actual achievement to the objective is less 
          than 50% the Key Employee will lose all entitlement to the Option 
          Shares for that fiscal year.  Any achievements between such 
          percentages shall be pro rated.  Notwithstanding the foregoing, 
          the Directors may grant additional Option Shares in the event of 
          extraordinary achievements.

     6.2  The Secretary shall advise the Key Employee of the number of Option
          Shares vested in each fiscal year.

     6.3  Upon vesting any Option Shares may, subject to the terms hereof, be
          purchased over a 3 year period from the date of the vesting.  Any
          Option Shares which are vested and not purchased by the expiration of
          the 3 year period shall remain in the Treasury of MacDonald
          Dettwiler.

                        SECTION 7 - SUBSCRIPTION AND EXERCISE TERMS

     7.1  A Key Employee wishing to exercise any Option for vested Option
          Shares shall give notice, in writing, to the Secretary exercising the
          Option, subscribing for all or any part of the Option Shares then
          vested and paying the applicable Subscription Price for such Option
          Shares subscribed for.

     7.2  Notwithstanding the foregoing, no Key Employee shall be entitled to
          subscribe for any Vested Option Shares hereunder, or purchase or pay
          for any vested Option Shares which are subscribed for, if such Key
          Employee does not purchase his full entitlement to Option Shares
          under ESOP-88 for that fiscal year, if the ESOP-88 offering is then
          current and for all previous fiscal years under ESOP-88 during which
          the Key Employee was a participant under both ESOP-88 and hereunder.

     7.3  After receipt of payment for any Subscriptions, MacDonald Dettwiler
          shall issue to each Key Employee a share certificate representing the
          Option Shares purchased hereunder in the name of the Key Employee.

                      SECTION 8 - TERMINATION OF OPTION OR SEPARATION

     8.1  If a Key Employee ceases to be an Employee for any reason whatsoever,
          the Key Employee shall only have the right to purchase those Option
          Shares which have vested prior to the Key Employee s Leaving Date and
          shall have the right to purchase any Option Shares which are so
          vested at that time, at any time or from time to time during the
          balance of the 3 year period with respect thereto.

                                     PAGE 4

     8.2  If a Key Employee shall cease to be an Employee by reason of death,
          the executor or personal representatives shall have the right the
          same rights as set forth in paragraph 8.1 hereof with respect to the
          Option Shares which have vested for that Key Employee.

                                    SECTION 9 - GENERAL

     9.1  In the event the authorized capital of the Company as presently
          constituted is consolidated into a lesser number of Common Shares or
          subdivided into a greater number of Common Shares, the number of
          Common Shares with respect to which the Option has been granted or
          subscribed for shall be decreased or increased proportionately, as
          the case may be, and the price to be paid by the Employee for each
          such Common Share shall be adjusted accordingly and the Employee
          shall have the benefit of any stock dividend declared, from the date
          as of which the Option is granted until the right to purchase the
          Common Shares under the Option terminates, with respect to the Common
          Share which may be purchased under the Option.

     9.2  From time to time, the Directors may amend any provision of the Plan,
          including increasing the Subscription Price for any unissued Option
          Shares, or terminate the Plan but no amendment or termination shall
          divest any Employee of his Option or any right an Employee may have
          in respect thereof, which is then exercisable, without the consent of
          such Employee.

UPON MOTION duly made and seconded, and after discussion, it was UNANIMOUSLY
RESOLVED that 300,000 Common Shares be and these are hereby allocated for issue
to eligible employees under the Employee Share Option Plan (ESOP-88) as at June
1, 1992 at a price per share of $3.60.  Employees must pay for subscribed
shares no later than May 30, 1996.  Any shares acquired under this allocation
of ESOP-88 and disposed of by employees before May 30, 1993 must be sold to the
Company for proceeds equal to cost.

                                     PAGE 5 


         AMENDMENT NO. 1 TO THE 1988 KEY EMPLOYEE STOCK OPTION PLAN OF
                    MacDONALD, DETTWILER AND ASSOCIATES LTD.


          In accordance with the Plan of Arrangement implemented pursuant to
that certain Combination Agreement dated as of August 31, 1995 and amended on
September 29, 1995 by and between MacDonald, Dettwiler and Associates Ltd.,
Orbital Sciences Corporation and 3173623 Canada Inc. (terms defined in the
Combination Agreement and not otherwise defined herein are used with the
meanings therein defined), the KESOP 88 shall be amended by deleting the words
in subsection 9.1 and replacing them with the words following:

          "In the event that the outstanding Shares of the Company
          shall be changed into or exchanged for a different number
          or of kind of securities of the Company or of another
          corporation, whether through an arrangement, amalgamation
          or other similar statutory procedure, or a share
          capitalization, sub-division or consolidation, then there
          shall be substituted for each Share subject to any such
          Option, for each share authorized for issuance pursuant to
          the Plan but not yet covered by an Option and for the
          maximum number of Shares issuable under the Plan with
          respect to any year, the number and kind of securities into
          which each outstanding Share shall be so changed or for
          which each such Share shall be exchanged.

          In the event that there shall be any change, other than as
          specified in this subsection, in the number or kind of
          outstanding Shares of  the Company or of any securities
          into which such Shares shall have been changed or for which
          Shares shall have been exchanged, then an equitable
          adjustment shall be made in the number or kind of Shares or
          any such securities theretofore authorized for issuance
          pursuant to the Plan but not yet covered by an Option, of
          the Shares or any such securities then subject to an Option
          or Options, and the maximum of Shares or any such
          securities issuable under the Plan with respect to any
          year, such adjustment to be reasonably determined by the
          Directors and to be effective and binding for all purposes.

          In the case of any such substitution or adjustment as
          provided for  in this subsection, the Option price for each
          share option agreement for each Share covered thereby prior
          to such substitution or adjustment will be proportionately
          and appropriately varied.  Such variation shall generally
          require that the number of securities covered by the Option
          after the relevant event multiplied by the revised Option
          price shall equal the number of shares covered by 

                                    PAGE 6

          the Option prior to the relevant event multiplied by the
          original Option price.  No adjustment or substitution
          provided for in this subsection shall require the Company
          in any share option agreement to issue a fractional Share
          and the total substitution or adjustment with respect to
          each share option agreement shall be limited accordingly."

          Dated this 17th day of November, 1995.

                                   Per: /s/ Robert Wallis                   
                                        MacDONALD, DETTWILER
                                        AND ASSOCIATES LTD.

                                     PAGE 7


                                                   Exhibit 4.9
                                                   Dated for reference purposes
                                                   only August 31, 1988


                      MACDONALD, DETTWILER AND ASSOCIATES LTD.

                          1988 EMPLOYEE SHARE OPTION PLAN

                            SECTION 1 - DEFINITIONS

This 1988 Employee Share Option Plan of MacDonald, Dettwiler and Associates
Ltd. established the 11th day of March, 1988 with effect from and after April
1, 1988.

     1.1  In the Plan, the following words shall have the following meaning:

          "Act" means the Employee Share Ownership Act (British Columbia) and
          the regulations thereunder as from time to time amended;

          "Common Shares" means the common voting shares of MacDonald Dettwiler
          as from time to time constituted;

          "Company" means MacDonald Dettwiler, or any subsidiary, all of whose
          voting shares are owned by MacDonald Dettwiler;

          "Directors" means the Board of Directors of MacDonald Dettwiler;

          "Discount Factor" means the maximum discount factor as permitted by
          the rules of the TSE;

          "Employee" means any person who is a permanent employee of the
          Company, employed for 25 hours or more per week and who has completed
          six full months of employment with the Company after his Employment
          Date, and prior to March 31 of each year;

          "Employee Salary" means for each Employee the current annual gross
          salary, excluding bonuses but including commissions paid or payable,
          if any, in respect of the applicable fiscal year;

          "Employment Date" means the date at which the Employee commenced his
          current employment with the Company;

                                       PAGE 1

          "Leaving Date" means the earliest date on which the Employee
          completes his service and ceases to be employed with the Company
          (whether caused voluntarily by resignation or involuntarily by
          dismissal or disability), or on which the Employee dies or on which
          his services are otherwise terminated; 

          "MacDonald Dettwiler" means MacDonald, Dettwiler and Associates Ltd.;

          "Market Price per Share" means the closing price of the Common Shares
          on the TSE;

          "Option" means the right to acquire Option Shares pursuant hereto;

          "Option Exercise Date" means the date 45 days after the Secretary of
          MacDonald Dettwiler has given notice of Option pursuant to paragraph
          4.2 hereof;

          "Option Shares" mean the number of Common Shares of MacDonald
          Dettwiler which are available for Options as determined in Article 3
          hereof;

          "Participation Factor" means 1 divided by the estimated participation
          factor determined by the Directors;

          "Subscription" means for any Employee, the number of Option shares
          subscribed for;

          "Subscription Price" for each fiscal year when the Common Shares are
          not listed on the TSE means the price per Common Share determined by
          the Directors, and when the Common Shares are listed on the TSE means
          the average closing Market Price per Share on the TSE for the 10 days
          preceding the date of calculation multiplied by (1 - the Discount
          Factor);

          "TSE" means The Toronto Stock Exchange;

          "Total Payroll" means the aggregate Employees' Salaries for all
          Employees at the end of the fiscal year.


                            SECTION 2 - ELIGIBILITY

     2.1  No person may be granted an Option to acquire Option Shares unless
          that person is an Employee.

                                   PAGE 2

     2.2  All Employees, as of the end of each fiscal year during the term
          hereof may be participants hereunder whether or not such Employees
          are also participants in any other employee or management share
          purchase or option plan of MacDonald Dettwiler.

     2.3  Any participant who ceases to be an Employee for any reason will at
          his Leaving Date forfeit all rights to exercise any Option granted
          hereunder.

                      SECTION 3 - NUMBER OF OPTION SHARES

     3.1  The number of Option Shares to be available to Employees for the life
          of the Plan shall not exceed 1,300,000 Common Shares and for any
          fiscal year during the term hereof shall be the number of Option
          Shares determined by the Directors as of the end of such fiscal year.

                          SECTION 4 - GRANT OF OPTION

     4.1  The Company shall grant Options to Employees in respect of each
          fiscal year of the Company commencing with the fiscal year ending
          March 31, 1988 to and including the fiscal year ending March 31, 1992
          in the manner as hereafter provided such period being called the term
          hereof.

     4.2  All Employees, except as hereafter provided, shall be granted an
          Option on or before 90 days after the end of each fiscal year of the
          Company, in such form as determined by the Secretary of the Company
          and to include the total number of Option Shares available to each
          Employee, and the Subscription Price thereof.

     4.3  The number of Option Shares available to each Employee shall be equal
          to the number of Option Shares obtained by the following formula:

               (Employee Salary)  x (total number of Option Shares) x
               (Total Payroll)      (Participation Factor) (available for 
                                    fiscal year)

     4.4  If an Employee participating hereunder ceases to be an Employee prior
          to June 30 of that fiscal year and forfeits his Option in accordance
          with Paragraph 2.3 here, the number of Option Shares so forfeited
          shall be forfeited but may be used by the Directors for allocation in
          any subsequent fiscal year.

     4.5  In the event that the total of all Option Shares subscribed for is
          less than the total number of Option Shares available in that year,
          the unsubscribed-for Option Shares be deemed to have been unissued
          and shall continue to remain in the Treasury of MacDonald Dettwiler.

                                     PAGE 3

     4.6  Any Option hereunder is not transferable.

                           SECTION 5 - EXERCISE TERMS

     5.1  The Options to acquire all or part of any Option Shares must be
          exercised by notice, in writing, by an Employee to the Secretary of
          MacDonald Dettwiler, exercising the Option in such form as determined
          by the Secretary, on or before the Option Exercise Date, and full
          payment for the Option Shares being purchased at the applicable
          Subscription Price must be made to MacDonald Dettwiler on or before
          the June 30 following the Option Exercise Date.

     5.2  Payment for Option Shares exercised and being purchased hereunder may
          be made either (i) by payment in full by June 30 following the Option
          Exercise Date; or (ii) by deduction from payroll over the period from
          May 1 to March 31 of the fiscal year following the grant of the
          Option, as elected by the Employee at the time of exercise of the
          Option.  If an Employee elects to pay for Option Shares pursuant to
          (ii) above, the Employee will be charged interest on the amount
          outstanding from time to time calculated at the prime rate of
          interest of the Company's principal bankers on May 1 of each year and
          payable semi-monthly by such deduction.

     5.3  No Option Shares will be issued until fully paid for.

     5.4  The Employee shall as part of the purchase hereunder of the Option
          Shares agree to be bound by the terms of this Plan in the form as
          established by MacDonald, Dettwiler from time to time.

     5.5  After receipt of payment in full for the Subscription, MacDonald
          Dettwiler shall issue to each Employee a share certificate
          representing the Option Shares purchased hereunder registered in the
          name of the Employee.

                      SECTION 6 - CESSATION OF EMPLOYMENT

     6.1  If an Employee (having elected to purchase shares by payroll
          deduction) ceases to be an Employee, for any reason whatsoever, prior
          to full payment for the Option Shares, he may elect to pay the
          balance of the Subscription Price for the Option Shares or, if he
          fails to so elect, he shall cease to be entitled to such Option
          Shares and MacDonald Dettwiler shall pay to him the amount paid by
          the Employee prior to his Leaving Date for such purchase but
          excluding interest.

     6.2  If, prior to June 30 of the year following the purchase by an
          Employee of Option Shares, an Employee or a person who has ceased to
          be an Employee (for 
  
                                    PAGE 4

          any reason whatsoever) wishes to sell such Option
          Shares, the Employee shall be required to sell to MacDonald
          Dettwiler, and MacDonald Dettwiler shall be required to purchase from
          the Employee the Option Shares purchased by the Employee at the
          Subscription Price paid by the Employee for those shares within one
          month of the Employee notifying MacDonald Dettwiler that he wishes to
          sell such Option Shares.

                    SECTION 7 - EMPLOYEE SHARE OWNERSHIP ACT

     7.1  If this plan shall be registered under the Act, the following terms
          and conditions shall apply:

               (a)  if any Employee shall make application under the Act for,
                    and receive, an incentive under the Act, the share
                    certificates for the Option Shares shall be legended as
                    required by the Act and the share certificate for the
                    Option Shares shall be held by the authorized person on
                    behalf of the Employee for a period of 3 years following
                    the issue of those Option shares, subject to the exceptions
                    provided by the Act;

               (b)  the plan may be amended in any manner whatsoever by the
                    Directors in order to obtain registration under the Act;

               (c)  the Option Exercise Date and the issue date for the Option
                    may be extended by the Directors for the April 1, 1988
                    grant to permit registration of the Plan under the Act and
                    at the discretion of the Directors, no shares will be
                    issued until registration is obtained.

                              SECTION 8 - GENERAL

     8.1  In the event the authorized capital of the Company as presently
          constituted is consolidated into a lesser number of Common Shares or
          subdivided into a greater number of Common Shares, the number of
          Common Shares with respect to which the Option has been granted shall
          be decreased or increased proportionately, as the case may be, and
          the price to be paid by the Employee for each such Common Share shall
          be adjusted accordingly and the Employee  shall have the benefit of
          any stock dividend declared, from the date as of which the Option is
          granted until the right to purchase the Common Shares under the
          Option terminates, with respect to the Common Share which may be
          purchased under the Option.

                                    PAGE 5

     8.2  From time to time, the Directors may amend any provision of the Plan,
          including increasing the Subscription Price for any unissued Option
          Shares, or terminate the Plan but no amendment or termination shall
          divest any Employee of his Option or any right an Employee may have
          in respect thereof, which is then exercisable, without the consent of
          such Employee. 

                                    PAGE 6

             AMENDMENT NO. 1 TO THE 1988 EMPLOYEE STOCK OPTION PLAN
                  OF MacDONALD, DETTWILER AND ASSOCIATES LTD.

          In accordance with the Plan of Arrangement implemented pursuant to
that certain Combination Agreement dated as of August 31, 1995 and amended on
September 29, 1995 by and between MacDonald, Dettwiler and Associates Ltd.,
Orbital Sciences Corporation and 3173623 Canada Inc. (terms defined in the
Combination Agreement and not otherwise defined herein are used with the
meanings therein defined), the ESOP 88 shall be amended by deleting the words
in subsection 8.1 of the ESOP 88 and replacing them with the words following:

          "In the event that the outstanding Shares of the Company
          shall be changed into or exchanged for a different number
          or of kind of securities of the Company or of another
          corporation, whether through an arrangement, amalgamation
          or other similar statutory procedure, or a share
          capitalization, sub-division or consolidation, then there
          shall be substituted for each Share subject to any such
          Option, for each share authorized for issuance pursuant to
          the Plan but not yet covered by an Option and for the
          maximum number of Shares issuable under the Plan with
          respect to any year, the number and kind of securities into
          which each outstanding Share shall be so changed or for
          which each such Share shall be exchanged.

          In the event that there shall be any change, other than as
          specified in this subsection, in the number or kind of
          outstanding Shares of  the Company or of any securities
          into which such Shares shall have been changed or for which
          Shares shall have been exchanged, then an equitable
          adjustment shall be made in the number or kind of Shares or
          any such securities theretofore authorized for issuance
          pursuant to the Plan but not yet covered by an Option, of
          the Shares or any such securities then subject to an Option
          or Options, and the maximum of Shares or any such
          securities issuable under the Plan with respect to any
          year, such adjustment to be reasonably determined by the
          Directors and to be effective and binding for all purposes.

          In the case of any such substitution or adjustment as
          provided for in this subsection, the Option price for each
          share option agreement for each Share covered thereby prior
          to such substitution or adjustment will be proportionately
          and appropriately varied.  Such variation shall generally
          require that the number of securities covered by the Option
          after the relevant event multiplied by the revised Option
          price shall equal the number of shares covered by 

                                 PAGE 7

          the Option prior to the relevant event multiplied by the
          original Option price.  No adjustment or substitution
          provided for in this subsection shall require the Company
          in any share option agreement to issue a fractional Share
          and the total substitution or adjustment with respect to
          each share option agreement shall be limited accordingly."

          Dated this 17th day of November, 1995.



                                   Per: /s/ Robert Wallis                    
                                        MacDONALD, DETTWILER
                                        AND ASSOCIATES LTD.

                                 PAGE 8


                                                                   Exhibit 4.10

                           ASSUMPTION OF STOCK OPTION

This is to confirm that pursuant to the Plan of Arrangement (the "Arrangement")
among Orbital Sciences Corporation ("Orbital"), MacDonald Dettwiler Holdings
Inc. ("Acquisition") and McDonald, Dettwiler and Associates, Ltd. ("MDA"),
Orbital has assumed as of November 17, 1995 (the "Effective Date") the stock
option issued to [Name] on [Option Date] for _____________ common shares of MDA
at an exercise price equal to $Cdn _________  per share (the "MDA Option
Price") (the "Option"), a copy of which is attached hereto and which Option was
issued pursuant to the MacDonald Dettwiler [Plan Name]. As so assumed, the
Option is for __________ shares of common stock, par value $.01 per share, of
Orbital (the "Orbital Option Shares") (which is that number of shares currently
issuable under the Option multiplied by the Exchange Ratio (as such term is
defined in the Arrangement)) at an exercise price of U.S. $ [Exercise Price]
per share (which is equal to the MDA Option Price divided by the Exchange Ratio
and converted into U.S. dollars based an exchange ratio of
$U.S.__________/$Cdn________ on the Effective Date).  The Orbital Options under
this Assumption of Stock Option shall vest in accordance with the vesting
schedule specified in the Option.

Except as specified herein, the term and all other terms and conditions of the
Option shall be unchanged by the assumption thereof by Orbital.

ORBITAL SCIENCES CORPORATION       ACCEPTED AND ACKNOWLEDGED,
                                   the ____ day of ______________, 1995:


By  ______________________________      ___________________________________ 
                                
     David W. Thompson, President       [Name]
     and Chief Executive Officer

                                   PAGE 1


Orbital Sciences Corporation
November 21, 1995
Page 1
                                                       Exhibit 5

                              November 21, 1995




Orbital Sciences Corporation
21700 Atlantic Boulevard
Dulles, Virginia  20166

Ladies and Gentlemen:

   This opinion is rendered to you in connection with the Registration
Statement on Form S-8, filed on or about the date hereof with the Securities
and Exchange Commission under the Securities Act of 1933, as amended (the
"Registration Statement"), for the registration by Orbital Sciences Corporation
(the "Company") of the sale by it of 328,399 shares of the Company's common
stock, $0.01 par value per share (the "Common Stock"), from time to time
pursuant to the following stock option plans of MacDonald, Dettwiler and
Associates Ltd., a newly acquired subsidiary of the Company: Amended and
Restated Key Employee Share Option Plan - 1994, Key Employee Share Option Plan
- - 1993, Key Employee Share Option Plan - 1988, and Employee Share Option Plan -
 1988, in each case as amended to date (together, the "Plans") (the 328,399
shares issuable pursuant to the Plans are collectively referred to herein as
the "Shares").

   We have acted as counsel for the Company in connection with the preparation
and filing of the Registration Statement.  In connection with this opinion we
have examined the Restated Certificate of Incorporation and Bylaws of the
Company and all amendments thereto and have examined and relied on the
original, or copies certified to our satisfaction, of such records of meetings
of the directors and stockholders of the Company, documents and other
instruments, including the Plans, as in our judgment were necessary or
appropriate to enable us to render the opinions express below.

   Based on the foregoing, we are of the opinion that:

   1. The Company is a corporation duly organized and validly existing under the
laws of the State of Delaware.

   2.  The Shares have been duly authorized and, when issued and sold by the
Company pursuant to the Plans, will be validly issued, fully paid and non-
assessable.

                                   PAGE 1

   We hereby consent to your filing this opinion as an exhibit to the
Registration Statement.  We understand that this opinion is to be used only in
connection with the offer and sale of the Common Stock described above while
the Registration Statement is in effect.

                                     Very truly yours,
 
                                     /s/ Ropes & Gray
    
                                     Ropes & Gray
 
                                   PAGE 2


                                                                   Exhibit 23.2

                              ACCOUNTANTS' CONSENT


The Board of Directors and Stockholders
Orbital Sciences Corporation:

We consent to the use of our reports incorporated by reference in the
registration statement on Form S-8, which reports are included in the Company's
1994 Annual Report on Form 10-K.

Our report on the consolidated financial statements refers to a change in
accounting for income taxes.


                                        /s/ KPMG Peat Marwick LLP
                                        KPMG Peat Marwick LLP

Washington, D.C.
November 16, 1995
                                  PAGE 1


                                                                   Exhibit 23.3

ACCOUNTANTS' CONSENT

The Board of Directors
Orbital Sciences Corporation:

We consent to the incorporation by reference in the Registration Statement on
Form S-8 of Orbital Sciences Corporation of our report dated May 25, 1995,
except as to Note 8(d) which is as at September 29, 1995, with respect to the
consolidated balance sheets of MacDonald, Dettwiler and Associates Ltd. as at
March 31, 1995 and 1994, and the related consolidated statements of earnings,
retained earnings and changes in financial position for each of the years in
the three-year period ended March 31, 1995, which report appears in the Form 8-
K of Orbital Sciences Corporation dated October 19, 1995.


/s/ KPMG Peat Marwick Thorne

Chartered Accountants


Vancouver, Canada
November 17, 1995

                                   PAGE 1


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