AMERICAN MOBILE SATELLITE CORP
S-8, 1998-05-21
COMMUNICATIONS SERVICES, NEC
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                                                  Registration No.333-


                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549
                              ---------------------


                                    FORM S-8


                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                              ---------------------

                      AMERICAN MOBILE SATELLITE CORPORATION
               (Exact name of issuer as specified in its charter)

                                    Delaware
                         (State or other jurisdiction of
                         incorporation or organization)
                                   93-0976127
                                (I.R.S. Employer
                               Identification No.)


                            10802 Parkridge Boulevard
                           Reston, Virginia 20191-5416
                                  703-758-6000
                     (Address of Principal Executive Offices
                    including Zip Code, and telephone number,
        including Area Code of registrant's principal executive offices)

          American Mobile Satellite Corporation 1989 Stock Option Plan
                            (Full title of the Plan)

                              Randy S. Segal, Esq.
                  General Counsel, Vice President and Secretary
                      American Mobile Satellite Corporation
                            10802 Parkridge Boulevard
                           Reston, Virginia 20191-5416
                                  703-758-6000

                     (Name, address, including Zip Code, and
               telephone number, including Area Code, of agent for
                                    service)



                  Approximate date of commencement of proposed
                    sale of the securities: From time to time
                        after the effective date of this
                             Registration Statement.


<PAGE>



                         CALCULATION OF REGISTRATION FEE
================================================================================

                                   Proposed
                                   Maximum      Proposed
Title of                           Offering     Maximum
securities         (1) Amount      Price        Aggregate        Amount of
to be                  to be       Per          Offering       registration
registered          registered     Share        Price               fee
- --------------------------------------------------------------------------------
Common
Stock
par value
$.01 per            1,000,000      (2)          $11,500,000    $3,432.84
share.....          shares

================================================================================
(1)      Represents  the  maximum  number  of  additional  shares  which  may be
         distributed pursuant to this Registration  Statement,  absent operation
         of   recapitalization   provisions   of  the  Plan.   Such   additional
         undeterminable  number of shares as may be  required  by reason of such
         recapitalization provisions is hereby also registered.

(2)      Not applicable.


                                       -2-

<PAGE>









     The contents of Registration  Statements No. 33-72852, No. 33-34250 and No.
333-30099 are hereby incorporated by reference.



                                       -3-

<PAGE>



Item 8.           Exhibits


Exhibits                 Description of Exhibit
- --------                 ----------------------


4.6       --   1989 Employee Stock Option Plan as amended May 20, 1998.
               (Filed herewith.)

5         --   Opinion of Randy S. Segal, General Counsel of the Company, as
               to the validity of the securities being offered.(Filed herewith.)

23(a)     --   Consent of Arthur Andersen LLP. (Filed herewith.)

23(b)     --   Consent of Randy S. Segal, General Counsel of the Company
               (included in Exhibit 5).

24        --   Powers of Attorney (included on signature pages).

                                        -4-

<PAGE>




                                   SIGNATURES

             Pursuant to the  requirements  of the  Securities  Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing a 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 Fairfax, Commonwealth of Virginia, on May 20, 1998.

                                         AMERICAN MOBILE SATELLITE CORPORATION


                                       By:  /s/Gary M. Parsons
                                            ------------------
                                            Gary M. Parsons
                                            Chief Executive Officer



                                POWER OF ATTORNEY

             KNOW ALL MEN BY THESE  PRESENTS,  that each person whose  signature
appears  below  hereby  constitutes  and  appoints  Gary M.  Parsons,  Walter V.
Purnell, Jr. and Randy S. Segal, his true and lawful attorney-in-fact and agent,
with full power of  substitution  and  resubstitution,  for him and in his name,
place and stead,  in any and all  capacities,  to sign any and all amendments to
this registration  statement,  and to file the same , with exhibits thereto, and
other  documents  in  connection  therewith  with the  Securities  and  Exchange
Commission,  granting  unto  said  attorney-in-fact  and  agent  full  power and
authority to do and perform each and every act and thing requisite and necessary
to be done,  as fully to all and intents and purposes as he might or could do in
person, hereby ratifying and confirming all that said attorney-in-fact and agent
or either of them, or their or his substitute or substitutes, may lawfully do or
cause to be done by virtue hereof.



                                      - 5 -

<PAGE>



             Pursuant to the  requirements  of the Securities Act of 1933,  this
Registration  Statement  has been signed below by the  following  persons in the
capacities and on the dates indicated:


       Name                       Title                           Date
       ----                       -----                           ----

/s/Gary M. Parsons              Chairman of the Board       May 20, 1998
- -----------------               of Directors (Principal  
Gary M. Parsons                 Executive Officer)


/s/Stephen D. Peck              Chief Financial Officer     May 20, 1998
- ------------------              and President (Principal
Stephen D. Peck                 Financial and Accounting
                                Officer)


/s/Douglas I. Brandon           Director                    May 20, 1998
- ---------------------
Douglas I. Brandon


/s/Ho Siaw Hong                 Director                    May 20, 1998   
- --------------------
Ho Siaw Hong


                                Director                    May 20, 1998  
- ------------------
Pradeep P. Kaul



/s/Billy J. Parrott             Director                    May 20, 1998  
- -------------------
Billy J. Parrott


                                Director                    May 20, 1998  
- ---------------------
Andrew A. Quartner


/s/Jack A. Shaw                 Director                    May 20, 1998
- ---------------                 
Jack A. Shaw


/s/Roderick M. Sherwood, III    Director                    May 20, 1998  
- ----------------------------
Roderick M. Sherwood, III


/s/Michael T. Smith             Director                    May 20, 1998  
- -------------------
Michael T. Smith


                                Director                    May 20, 1998  
- -----------------
Yap Chee Keong


                                      - 6 -

<PAGE>



                                INDEX TO EXHIBITS


Exhibits                      Description of Exhibit                    
                                                       
4.6      --   1989 Employee Stock Option Plan as amended May 20,
              1998.  (Filed herewith.)

5        --   Opinion of Randy S. Segal, General Counsel of the 
              Company, as to the validity of the securities being 
              offered. (Filed herewith.)

23(a)    --   Consent of Arthur Andersen & Co. (Filed herewith.)

23(b)    --   Consent of Randy S. Segal,  General Counsel of the 
              Company  (included in Exhibit 5).

24       --   Powers of Attorney (included on signature pages).


                                     - 7 -

<PAGE>






                      AMERICAN MOBILE SATELLITE CORPORATION
                         1989 EMPLOYEE STOCK OPTION PLAN
                        As Amended Effective May 20, 1998







1.     Definitions

       In this Plan, except where the context otherwise indicates, the following
definitions apply:

       A.      "Agreement" means a  written agreement implementing a grant of an
               Option or an award f Bonus Stock.

       B.      "Board" means the Board of Directors of the Corporation.

       C.      "Bonus  Stock" means Shares  awarded under the Plan in accordance
               with the terms of Article 9.

       D.      "Code" means the Internal Revenue Code of 1986, as amended.

       E.      "Committee"   means  the  committee  of  the  Board  meeting  the
               standards of Rule 16b- 3(c)(2)(i)  under the Exchange Act, or any
               similar successor rule,  appointed by the Board to administer the
               Plan. Unless otherwise  determined by the Board, the Compensation
               Committee of the Board shall be the Committee.

       F.      "Common Stock" means  the common stock, par value $.01 per share,
               of the Corporation.

       G.      "Corporation" means AMERICAN MOBILE SATELLITE CORPORATION.

       H.      "Date  of  Exercise"  means  the date on  which  the  Corporation
               receives  notice of the exercise of an Option in accordance  with
               the terms of Article 7.

       I.      "Date of Grant"  means the date as of which an Option is  granted
               or an award of Bonus  Stock is  authorized  by the  action of the
               Committee  or  such  later  date  as  may  be  specified  in  the
               authorization.

       J.      "Employee" means any  person determined by the Committee to be an
               employee of the Corporation or of a Subsidiary.

       K.      "Exchange  Act" means the  Securities  Exchange  Act of 1934,  as
               amended.

       L.      "Fair  Market  Value" of a Share  means the  amount  equal to the
               average of the high and low  prices of a Share on the  applicable
               date  as  reported  by the  consolidated  tape  of  the  National
               Association of Securities Dealers Automated Quotation (or on such
               other recognized  quotation system on which the trading prices of
               the Common Stock are quoted on the  applicable  date),  or, if no
               Share  transactions  are  reported  on such  tape (or such  other
               system)  on the  applicable  date,  the high and low  prices of a
               Share  on  the   immediately   preceding   date  on  which  Share
               transactions  were so reported,  or as  determined  pursuant to a
               reasonable method adopted by the Committee in good faith for such
               purpose.

                                      - 1 -

<PAGE>



       M.      "Grantee" means an Employee to whom bonus Stock has been awarded.

       N.      "Insider"  means an  Optionee  or  Grantee  who is subject to the
               reporting requirements under Section 16(a) of the Exchange Act.

       O.      "Option"  means an option to purchase  Shares  granted  under the
               Plan in accordance with the terms of Article 6.

       P.      "Option  Period"  means the period  during which an Option may be
               exercised.

       Q.      "Option  Price"  means the price per Share at which an Option may
               be exercised. The Option Price shall not be less than the greater
               of the Fair Market Value per Share  determined  as of the Date of
               Grant or the par value of the Common Stock.

       R.      "Optionee" means an Employee to whom an Option has been granted.

       S.      "Plan" means this  AMERICAN  MOBILE  SATELLITE  CORPORATION  1989
               Stock Option Plan.

       T.      "Reload  Option"  means a new Option  granted to an Optionee upon
               the  surrender  of Shares to pay the Option Price of a previously
               granted Option.  The Option Price for any Reload Option shall not
               be less than the greater of the Fair  Market  Value of a Share on
               the date that  Shares  are  surrendered  in payment of the Option
               Price in accordance  with Section  3.A(d) or the par value of the
               Common Stock.  Other terms of the Reload Option shall be the same
               as the terms  contained in the Optionee's  Agreement  relating to
               the Option being exercised.

       U.      "Share" means a share of Common Stock.

       V.      "Subsidiary"  means  a  corporation  at  least  50% of the  total
               combined  voting  power of all classes of stock of which is owned
               by the  Corporation  either  directly  or  through  one  or  more
               Subsidiaries.

       W.      "Withholding Tax Liabilities"  means the  Corporation's  federal,
               state  and any  local  income  tax and  payroll  withholding  tax
               obligations  arising in connection with the exercise of an Option
               or the  award of Bonus  Stock  under the  Plan.  Withholding  Tax
               Liabilities  does  not  include  the  Corporation's  share of any
               payroll taxes.


2.     Purpose

       The Plan is intended to assist in attracting  and retaining  Employees of
outstanding  ability and to promote the  identification  of their interests with
those of the shareholders of the Corporation.

3.     Administration

       The Plan shall be administered by the Committee. In addition to any other
powers granted to the Committee,  it shall have the following powers, subject to
the express provisions of the Plan:

       A.      subject to the  provisions  of this  Plan,  to  determine  in its
               discretion  the Employees to whom Options shall be granted and to
               whom Bonus  Stock  shall be  awarded,  the number of Shares to be
               subject to each Option or Bonus Stock  award,  and the terms upon
               which  Options may be acquired  and  exercised  and the terms and
               conditions of Bonus Stock awards;

                                      - 2 -

<PAGE>



       B.      to determine all other terms and  provisions  of each  Agreement,
               which need not be identical;

       C.      without  limiting the generality of the foregoing,  to provide in
               its discretion in an Agreement:

               (a)  for an  agreement  by the  Optionee  or  Grantee  to  render
services to the  Corporation  upon such terms and conditions as may be specified
in the Agreement, provided that the Committee shall not have the power to commit
the Corporation to employ or otherwise retain any Optionee or Grantee;

               (b) for restrictions on the transfer,  sale or other  disposition
of Shares  issued to the  Optionee  upon the  exercise of an Option or for other
restrictions permitted by Article 9 with respect to Bonus Stock;

               (c) for an  agreement by the Optionee or Grantee to resell to the
Corporation,  under specified conditions,  Shares issued upon the exercise of an
Option or awarded as Bonus Stock;

               (d) for the right of the Optionee to surrender to the Corporation
an Option (or a portion  thereof) that has become  exercisable  and receive upon
such surrender,  without any payment to the  Corporation or a Subsidiary  (other
than amounts  necessary to satisfy  Withholding Tax Liabilities  with respect to
the Option) that number of Shares  (equal to the highest whole number of Shares)
having an aggregate Fair Market Value as of the date of surrender  equal to that
number of Shares subject to the Option (or portion  thereof)  being  surrendered
multiplied  by an amount  equal to the excess of (i) the Fair Market  Value of a
Share on the date of  surrender  over (ii) the Option  Price,  plus an amount of
cash  equal  to the  Fair  Market  Value of any  fractional  Share to which  the
Optionee might be entitled;  any such surrender shall be treated as the exercise
of the Option (or portion thereof); and

               (e) for the  automatic  issuance  of a Reload  Option  covering a
number of Shares equal to the number of any Shares used to pay the Option Price;

       D.      to construe and interpret the Agreements and the Plan;

       E. to require, whether or not provided for in the pertinent Agreement, of
any person  exercising an Option or acquiring Shares of Bonus Stock, at the time
of such exercise or acquisition, the making of any representations or agreements
which the Committee may deem  necessary or advisable in order to comply with the
securities laws or the United States or of any state; and

       F. to make all other  determinations and take all other actions necessary
or advisable for the administration of the Plan.

       Any  determinations or actions made or taken by the Committee pursuant to
this Article shall,  subject to the express  provisions of this Plan, be binding
and final.

4.     Eligibility

       Options  and Bonus  Stock may be granted or  awarded  only to  Employees,
provided,  however,  that members or the  Committee  are not eligible to receive
Options or Bonus Stock.  Subject to the  limitations of Section 5.A, an Employee
who has been granted an Option or Bonus Stock may be granted  additional Options
or Bonus Stock.

                                      - 3 -

<PAGE>



5.     Stock Subject to the Plan

       A.  Subject to  adjustment  as provided in Article  11, an  aggregate  of
4,500,000  authorized and unissued Shares,  reissued  treasury Shares, or Shares
otherwise  acquired by the  Corporation,  may be issued  under the Plan upon the
exercise  of Options or pursuant to awards of Bonus  Stock,  provided,  however,
that no Employee may be granted  Options and awarded  Bonus Stock  covering more
than 50% of the number of Shares issuable under the Plan.

       B. If an Option  expires or terminates for any reason without having been
fully  exercised,  or if Shares of Bonus Stock are  forfeited,  the  unpurchased
Shares  which had been  subject to the Option at the time of its  expiration  or
termination,  or the forfeited Shares of Bonus Stock, shall become available for
the grant of other Options or for the award of additional Shares of Bonus Stock,
provided,  that in the case of forfeited  Shares and to the extent  necessary to
satisfy the  provisions  of Rule 16b-3 under the  Exchange  Act, the Grantee has
received no dividends prior to forfeiture with respect to such Shares.

6.     Options

       A. Subject  to the  provisions  of this  Plan,  the  Committee  is hereby
authorized to grant Options to Employees.

       B. All  Agreements  granting  Options shall contain a statement  that the
Option is intended to be a nonstatutory  stock option and not an incentive stock
option as defined in section 422 of the Code.

       C.  The  Option   Period  shall  be   determined  by  the  Committee  and
specifically set forth in the Agreement, provided, however, that an Option shall
not be  exercisable  before six months from the Date of Grant  (except that this
limitation  need not apply in the event of the death of the Optionee  within the
six-month  period) and no Option shall be exercisable  after ten years after the
Date of Grant.

       D. By  accepting  the grant of an Option  under the Plan,  each  Optionee
agrees,  for the Optionee and his or her successors,  that the Option may not be
exercised  at  any  time  that  the  Corporation  does  not  have  in  effect  a
registration statement under the Securities Act of 1933, as amended, relating to
the offer of Common Stock to the Optionee under the Plan, unless the Corporation
agrees to permit such exercise,  and that,  upon the issuance of any Shares upon
the  exercise  of the  Option,  the  Optionee  will,  upon  the  request  of the
Corporation,  agree in  writing  that he or she is  acquiring  such  Shares  for
investment only and not with a view to resale, and that he or she will not sell,
pledge or  otherwise  dispose of such Shares so issued  unless and until (i) the
Corporation  is  furnished  with  an  opinion  of  counsel  to the  effect  that
registration  of such Shares pursuant to the Securities Act of 1933, as amended,
is not required by that Act and the rules and regulations  thereunder;  (ii) the
staff of the Securities and Exchange  Commission has issued a "no-action" letter
with respect to such disposition;  or (iii) such registration or notification as
is, in the  opinion  of counsel  for the  Corporation,  required  for the lawful
disposition  of such  Shares  has been filed by the  Corporation  and has become
effective;  provided,  however,  that the Corporation  shall not be obligated to
file any such registration or notification.  The Option shall further agree that
the Company may place a legend  embodying such  restriction on the  certificates
evidencing such shares.


                                      - 4 -

<PAGE>



       E. All other terms of Options  granted under the Plan shall be determined
by the  Committee in its sole  discretion,  as exercised  consistently  with the
terms of the Plan, and specifically set forth in the Optionee's  agreement.  Any
terms of Options  determined by the  Committee  that vary from the express terms
set forth in the Plan also  shall be  specifically  set forth in the  Optionee's
Agreement.


7.     Exercise

       A. An Option may,  subject to the provisions of the Agreement under which
it was  granted,  be  exercised  in  whole  or in  part by the  delivery  to the
Corporation of written notice of the exercise, in such form as the Committee may
prescribe,  accompanied  by full payment of the Option Price for the Shares with
respect to which the Option is exercised in accordance  with Section 7.B, and by
satisfaction  by the Optionee of Withholding  Tax Liabilities in accordance with
Article 10.

       B. The  Option  Price  may be paid in the  form of (i)  cash,  which  may
include an  assignment  of the right to  receive  cash  proceeds  of the sale of
Common  Stock  subject to the Option  pursuant to a "cashless  exercise"  of the
Option  through a transaction  with a broker,  (ii) duly  endorsed  certificates
representing Shares (other than Shares that are subject to a substantial risk of
forfeiture)  having a Fair Market Value on the Date of Exercise  aggregating not
more than the portion of the Option Price being paid by delivery of such Shares,
or (iii) a  combination  of cash and Shares as provided  in Sections  7.B(i) and
(ii).

       C.  To  the  extent   required   to  comply  with   Treasury   Regulation
ss.1.401(k)-1(d)(2)(iv)(B)(4),   or  any  amendment  or  successor  thereto,  an
Optionee's  "elective  and employee  contributions"  (within the meaning of such
Treasury  Regulation)  under the Plan shall be suspended  for a period of twelve
months  following such  Optionee's  receipt of a hardship  distribution  made in
reliance on such Treasury Regulation from any plan containing a cash or deferred
arrangement  under Section 401(k) of the Code maintained by the Corporation or a
related  party within the  provisions  of  subsections  (b),  (c), (m) or (o) of
Section 414 of the Code.

8.     Nontransferability

       Options granted under the Plan shall not be  transferable  otherwise than
(a) by will or the  laws of  descent  and  distribution,  or (b)  pursuant  to a
qualified  domestic  relations order as defined in Section 414(p) of the Code or
Title I of the Employee  Retirement Income Security Act or the rules thereunder,
and an Option may be  exercised,  during the  Optionee's  lifetime,  only by the
Optionee or, in the case of the Optionee's legal  disability,  by the Optionee's
legal representative.

9.     Bonus Stock

       A.  Subject to the  provisions  of this  Plan,  the  Committee  is hereby
authorized to award Bonus Stock to Employees.

       B.  Bonus  Stock  shall be Shares  that  shall be  issued at such  times,
subject to  achievement  of such  performance  or other  goals and on such other
terms and conditions as the Committee shall deem appropriate.



                                      - 5 -

<PAGE>



10.    Satisfaction of Withholding Tax Liabilities

       Each Optionee or Grantee must provide the  Corporation  with the means to
satisfy the  Corporation's  Withholding  Tax  Liabilities,  with  respect to any
income  recognized  by the Optionee or Grantee as a result of the exercise of an
Option or award of Bonus Stock. Unless otherwise determined by the Committee and
specifically  set forth in the Optionee's or Grantee's  Agreement,  an Option or
Grantee may satisfy  Withholding  Tax  Liabilities by (i) delivering cash to the
Corporation,  (ii)  electing to have the  Corporation  retain  Shares  otherwise
issuable  on the  exercise of the Option or pursuant to the award of Bonus Stock
(other than Shares that are subject to a substantial risk of forfeiture),  (iii)
delivering  shares (other than Shares that are subject to a substantial  risk of
forfeiture)  to the  Corporation,  or (iv) electing to satisfy  Withholding  Tax
Liabilities  through a combination of clauses (i), (ii) or (iii) of this Article
10. Satisfaction of Withholding Tax Liabilities also shall be accomplished under
such  additional   reasonable  terms  and  conditions  as  the  Committee  deems
appropriate.  Unless otherwise  determined by the Committee and specifically set
forth in the  Optionee's or Grantee's  Agreement,  in the case of an Insider who
elects to satisfy  Withholding Tax Liabilities by having the Corporation  retain
Shares  otherwise  issuable on the exercise of an Option or pursuant to an award
to Bonus Stock,  the Insider shall have the right to so satisfy  Withholding Tax
Liabilities  through  (a) an  irrevocable  election  made at least six months in
advance of the date on which the Withholding Tax Liabilities  arise,  and (b) if
the  Withholding  Tax  Liabilities  arise  during  the ten  business  day period
beginning  on the  third  business  day  following  the  public  release  of the
Corporation's  quarterly or annual earnings  ("Window  Period"),  an irrevocable
election made during such Window Period.

11.    Capital Adjustments

       The number  and class of Shares  subject  to each  outstanding  Option or
award of Bonus  Stock,  the Option Price and the  aggregate  number and class of
Shares for which  grants or awards  thereafter  may be made  shall be  equitably
adjusted  by the  Committee  to reflect  such events as stock  dividends,  stock
splits, extraordinary cash dividends, adoption of stock rights plans, split-ups,
split-offs,  spin-offs,  liquidations,   combinations  or  exchange  of  shares,
recapitalizations,  mergers,  consolidations,  reorganizations  or  any  similar
transaction of or by the Corporation.

12.    Termination or Amendment

       The Board shall have the power to  terminate  the Plan and to amend it in
any respect, provided that, after the Plan has been approved by the shareholders
of the Company,  the Board may not,  without the approval of the shareholders of
the Company if such approval is then required by applicable  law or in order for
the Plan to  continue  to  satisfy  the  requirements  of Rule  16b-3  under the
Exchange Act,  amend the Plan so as to increase  materially the number of Shares
that may be issued  under the Plan (except as provided in Article 11), to modify
materially the requirements as to eligibility for  participation in the Plan, or
to increase  materially the benefits accruing to participants under the Plan. No
termination  or amendment of the Plan shall,  without his or consent,  adversely
affect the rights or obligations of any Optionee or Grantee.

13.    Modification, Extension and Renewal of Options and Bonus Stock

       Subject to the terms and  conditions  and within the  limitations  of the
Plan, the Committee may modify,  extend or renew outstanding  Options, or accept
the surrender of outstanding  Options (to the extent not theretofore  exercised)
granted under the Plan or under any other plan of the Corporation,  or a company
or similar entity acquired by the Corporation or a Subsidiary, and authorize the
granting of new Options (to the extent not theretofore  exercised),  pursuant to
the Plan in  substitution  therefor  and the  substituted  Options may specify a


                                      - 6 -

<PAGE>


lower  exercise  price  than the  surrendered  Options,  a longer  term than the
surrendered  Options or have any other  provisions  that are  authorized  by the
Plan.  Subject to the terms and  conditions  and within the  limitations  of the
Plan, the Committee may modify the terms of any outstanding  Agreement providing
for an  award  of  Bonus  Stock.  Notwithstanding  the  foregoing,  however,  no
modification  of an Option  granted  under the Plan, or an award of Bonus Stock,
shall,  without the consent of the  Optionee or Grantee,  alter or impair any of
the Optionee's or Grantee's right or obligations.

14.    Effectiveness of the Plan

       The Plan and any amendments  requiring  shareholder  approval pursuant to
Article  12  are  subject  to  approval  by  vote  of  the  shareholders  of the
Corporation within 12 months after their adoption by the Board.  Subject to that
approval,  the Plan and any  amendments  are effective on the date on which they
are  adopted by the  Board.  Options  and Bonus  Stock may be granted or awarded
prior to shareholder approval of the Plan or amendments, but each such Option or
Bonus  Stock  grant or award  shall be  subject to the  approval  of the Plan or
amendments  by the  shareholders.  Except to the extent  required to satisfy the
requirements  of Rule 16b-3 under the Exchange Act, the date on which any Option
or Bonus Stock granted or awarded prior to  shareholder  approval of the Plan or
amendment  is granted or awarded  shall be the Date of Grant for all purposes as
if the Option or Bonus Stock had not been subject to approval.  No Option may be
exercised prior to such shareholder approval,  and any Bonus Stock awarded shall
be forfeited if such shareholder approval is not obtained.

15.    Term of the Plan

       Unless sooner  terminated  by the Board  pursuant to Article 12, the Plan
shall  terminate  on  December  6, 2003,  and no  Options or Bonus  Stock may be
granted after termination.  The termination shall not affect the validity of any
Options or Bonus Stock may be granted after  termination.  The termination shall
not affect the validity of any Option or Bonus stock  outstanding on the date of
termination.

16.    Indemnification of Committee

       In addition to such other rights of  indemnification  as they may have as
Directors or as members of the Committee,  the members of the Committee shall be
indemnified  by the  Corporation  against  the  reasonable  expenses,  including
attorneys' fees, actually and reasonably incurred in connection with the defense
of any action, suit or proceeding,  or in connection with any appeal therein, to
which  they or any of them  may be a party  by  reason  of any  action  taken or
failure to act under or in connection with the Plan or any Option or Bonus Stock
granted or awarded hereunder, and against all amounts reasonably paid by them in
settlement  thereof  or paid by them in  satisfaction  or  judgment  in any such
action, suit or proceeding,  if such members acted in good faith and in a manner
which they  believed  to be in, and not opposed  to, the best  interests  of the
Corporation.

17.    General Provisions

       A. The  establishment  of the Plan shall not confer upon any Employee any
legal  or  equitable  right  against  the  Corporation,  any  Subsidiary  or the
Committee, except as expressly provided in the Plan.

       B. The Plan  does not  constitute  inducement  or  consideration  for the
employment of any Employee,  nor is it a contract  between the  Corporation or a
Subsidiary  and any  Employee.  Participation  in the  Plan  shall  not  give an
Employee  any  right  to be  retained  in  the  service  of the  Corporation  or
Subsidiary.

                                      - 7 -

<PAGE>



       C. The Corporation and is Subsidiaries may assume options,  warrants,  or
rights to purchase stock issued or granted by other  corporations whose stock or
assets shall be acquired by the  Corporation or a Subsidiary,  or which shall be
merged into or consolidated  with the  Corporation or a Subsidiary.  Neither the
adoption of this Plan, nor its submission to the shareholders, shall be taken to
impose any  limitations  on the powers of the  Corporation  or its affiliates to
issue,  grant, or assume options,  warrants,  rights, or bonus stock,  otherwise
than under this Plan,  or to adopt other stock option stock or bonus stock plans
or to impose any requirement of shareholder approval upon the same.

       D. The  interests of any  Employee  under the Plan are not subject to the
claims  of  creditors  and may  not,  in any  way,  be  assigned,  alienated  or
encumbered except as provided in Article 8.

       E.  The  Plan  and  each  Agreement  shall  be  governed,  construed  and
administered in accordance with the laws of the State of Delaware.

       F. The  adoption of the Plan,  the grant and  exercise of Options and the
award of Bonus  Stock  shall be subject to  receipt of all  required  regulatory
approvals,  including without  limitation any required  approvals of the Federal
Communications Commission.

       G. Should any  provision  of the Plan that is intended to comply with the
provisions  of Rule 16b-3 under the  Exchange Act at the date of the adoption of
the Plan by the Board not be necessary for such compliance,  or become no longer
necessary for such compliance, such provision of the Plan shall have no force or
effect  under the Plan as of the date that such  provision  is not  required for
purpose of satisfying the provisions of Rule 16b-3 under the Exchange Act.


                                      - 8 -

<PAGE>









                                             May 20, 1998



American Mobile Satellite Corporation
10802 Parkridge Boulevard
Reston, Virginia 20191-5416

                      American Mobile Satellite Corporation
                       Registration Statement on Form S-8

Dear Sirs:

       I have  acted as your  counsel in  connection  with the  preparation  and
filing with the Securities and Exchange  Commission  under the Securities Act of
1933, as amended (the "Securities Act"), of a Registration Statement on Form S-8
(the "Registration Statement") relating to 1,000,000 additional shares of Common
Stock, par value $.01 per share ("Common  Stock"),  of American Mobile Satellite
Corporation,  a Delaware  corporation  ("AMSC"),  issuable  under the 1989 Stock
Option Plan (the "Plan").

       In so acting,  I have examined the Plan and have examined and relied upon
the  originals,  or  copies  certified  to my  satisfaction,  of  such  records,
documents or other instruments as in my judgment are necessary or appropriate to
enable me to render the opinion set forth below.

       Based on the  foregoing,  I am of the  opinion  that  authorized  but not
previously  issued  shares  of Common  Stock  which  may be  delivered  upon the
exercise of options  granted under the Plan or acquired under the Plan have been
duly authorized and when issued in accordance with the terms of the Plan will be
validly issued, fully paid and non-assessable.

       In giving the  foregoing  opinion,  I have  assumed  that at the time any
shares are issued upon exercise of the options or acquired pursuant to the Plan,
a sufficient  number of shares of Common  Stock which are not then  reserved for
issuance  for other  purposes  shall be  authorized  for  issuance  to cover the
issuance of such additional shares.

       I hereby  consent  to the  filing of this  opinion  as an  exhibit to the
Registration  Statement. In giving such consent, I do not thereby concede that I
am within the category of persons whose  consent is required  under Section 7 of
the Act or the Rules and  Regulations of the Securities and Exchange  Commission
thereunder.

                                             Very truly yours,
                                             /s/ Randy S. Segal
                                             Randy S. Segal
                                             General Counsel


<PAGE>





                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this  registration  statement on Form S-8 of our report dated March
31, 1998 included in American Mobile Satellite  Corporation's  Form 10-K for the
year ended  December 31, 1997 and to all references to our Firm included in this
registration statement.


/s/Arthur Andersen LLP
ARTHUR ANDERSEN LLP



Washington, D.C.
May 20, 1998




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