Exhibit 10.3c
                                                                 ---------------

                                                          Revised by Amendment 7


                                 AMENDMENT NO.7
                               TO THE AMSC/HUGHES
                            MSAT SPACECRAFT CONTRACT


This Amendment No. 7 to the MSAT Spacecraft AMSC-S/C-11/90-001 dated 10 December
1990 (the  Contract) as amended,  is made effective this  2nd  day  of  December
1997 by and between:

AMSC  SUBSIDIARY   CORPORATION,   as  assignee  of  AMERICAN  MOBILE   SATELLITE
CORPORATION,  (hereinafter  referred to as "AMSC"), a company incorporated under
the laws of the State of Delaware, having its principle place of business in the
Reston, Virginia, U.S.A.

AND

HUGHES  SPACE  AND   COMMUNICATIONS   COMPANY,   (hereinafter   referred  to  as
"Contractor"  or "HUGHES"),  a company  organized and existing under the laws of
Delaware with its principal place of business located in El Segundo, California,
USA.

WHEREAS, AMSC and HUGHES have heretofore entered into the Contract for provision
of a satellite and other items therein; and,

WHEREAS,  AMSC has  decided it will  lease the M2  Spacecraft  ("Spacecraft"  or
"Satellite")  to   African  Continental   Telcommunications   Ltd.  (hereinafter
referred to as "ACTEL" or "Lessee"); and,

WHEREAS,  pursuant to AMSC's request, HUGHES will enter into a separate contract
with Telesat Canada  (hereinafter  referred to as "Telesat" or "Operator"),  for
software and  procedures  so that Telesat,  as AMSC's  satellite  operator,  can
invert and roll the Spacecraft, and,

WHEREAS,  AMSC and  HUGHES  have  agreed to amend the terms of the  Contract  to
reflect  the  impact of AMSC's  lease of the  Satellite  with  ACTEL and  HUGHES
entering into a separate contract with Telesat; and

WHEREAS,  AMSC and HUGHES had previously  agreed to modify the Contract with the
approval  of a  revised  MSAT IRD with  Atlas  and  certain  Engineering  Change
Requests  (ECRs),  and the  Parties  now  wish to  incorporate  this IRD and the
following  ECRs  as  an  administrative   matter:  ECRs  456346-58,   456415-65,
456348-75,  456349-76,  456350-77,  456351-97,  456352-98A, into the Common Test
Plan;  and TMI has approved the same ECRs to change the MSAT IRD with Atlas into
their  Assignment  Agreement  and to make the same  related  adjustments  in the
Common  Technical  Specification  and Common  Test Plan of the  TMI/SPAR//HUGHES
Assignment Agreement; and

NOW,  THEREFORE,  in  consideration  of the mutual  benefit to be  derived,  the
Parties hereto agree that the Contract is amended as follows:

         Revise the Contract terms and conditions by  substituting  the attached
pages  dated  November  1997 for the  existing  pages  and  adding  new pages as
follows:

         4, 20, 20A, 39A, 74A, 74B, 74C

         Revise the  Attachment  2  Technical  Specification  for  Satellite  by
substituting  the attached pages attached October 1995 for the existing pages as
follows:

         Appendix A, pages 9 and 13


         Revise the  Attachment 4 Test Plan by  substituting  the attached pages
dated October 1995 for the existing pages and adding new pages as follows:

         2-4, 2-5, 4-6, 4-7, 4-7A, 4-8, 5-5, 5-6
         A-3, A-11A,  A-11B,  A-11C, A-14, A-15, A-17A,  A-17B, A-20, A-20A C-1,
         C-33, C-34, C-35, C-36, C-37, C-45, C-49

For purposes of clarity and  traceability,  each of the  substitute  pages above
(except for the Payment  Plan,) have been annotated to reflect the deleted text,
shown with a "strike  through"  () and/or  change  bar in the right hand  margin
(example |); and, the new text, shown by underling (example), italics (example),
a different  font (example  example)  and/or by a change bar in the right margin
(example  |). Each page is also  designated  with  "Revised  Amendment 7" in the
upper right hand corner.

There is no modification to this Contract except as expressly set forth above.






                                                          Revised by Amendment 7


IN WITNESS WHEREOF, the Parties hereto have executed this Amendment No. 7 to the
MSAT Contract AMSC-S/C-11/90-001.


AMSC SUBSIDIARY CORPORATION                     HUGHES SPACE &
                                                COMMUNICATIONS COMPANY

By: /s/Randy Segal                              By:  /s/Patrice Gray Mitchell
    --------------                                   ------------------------
       (Signed)                                       (Signed)

    Randy Segal                                      Patrice Gray Mitchell
    -----------                                      ---------------------
    (Printed or Typed)                               (Printed or Typed)


Title: Vice President                            Title:  Manager, Commercial/
                                                        International Contracts









                                                          Revised by Amendment 7












                         TERMS AND CONDITIONS REVISIONS


                                 AMENDMENT NO. 7

                                       To

                            AMSC/HUGHES MSAT CONTRACT


                                  NOVEMBER 1997








                                                          Revised by Amendment 7


and made a part of this Contract.

     "Contract  Price" means the total amount  expressed in this  Contract to be
payable to the Contractor  for the  satisfactory  performance of the Work,  such
Contract  Price  to  include,   where  applicable,   all  charges  for  Worker's
Compensation  insurance,  charges for  insurance,  shipping  costs and all other
assessments, except only as specifically excluded in Article 4.0.

     "Day"  means a  continuous  24-hour  period  commencing  a  12:00  midnight
(Greenwich Mean Time).

     "Designated  Launch Site" means the launch facility  provided by the Launch
Agency.

     "Equipment"  means  individual  assemblies,   parts  thereof  and  complete
systems.

     "Financing Entity" means an institution or other entity which lends
money or otherwise  provides  financing to AMSC for payment of amounts due under
this Contract.

     "Intentional  Ignition" means the deliberate,  intentional  ignition of the
first stage of any launch  vehicle for the purpose of launching  the  Spacecraft
into orbit.

     "Launch Agency" means the  organization  selected by AMSC to perform launch
services, including furnishing the launch vehicle, launch support, Equipment and
facilities for the purpose of launching the Spacecraft into orbit.

     "Properly  Operated  Satellite"  means a Satellite which is being monitored
and  commanded  in  accordance  with the  written  directives  and  instructions
furnished  to  AMSC  by  Contractor  in  the  Recommended   Satellite  Operating
Procedures  and any formal  amendments  thereto under this Contract or under the
Software Development and License Contract between Hughes and Telesat.










                                                          Revised by Amendment 7


               Performance  Incentive  Payments  commensurate  with the  profits
               generated by the Spacecraft.

               Impact to Incentives due to the Inversion of the Satellite



               AMSC shall have Telesat  perform the  relocation and inversion of
               the  Satellite.  Telesat  shall then operate the  Satellite in an
               inverted  position.  If the Satellite  fails during the inversion
               and/or  relocation   procedures  or  within  six  (6)  months  of
               completion  of the inversion and  relocation  procedure  provided
               that the  Satellite  is  exposed  to both the  Summer  and Winter
               solstices ("the Period"),  Hughes shall be entitled to payment of
               the PIPs, plus interest for each regularly  scheduled period from
               May  1995  through  the  3650th  day  thereafter.  If there is an
               anomaly  during  this  Period,  it shall be  deemed  to have been
               caused  by  the  Spacecraft  inversion  and  there  shall  be  no
               reduction  in the  PIPs  to be  paid  over  the  lifetime  of the
               Satellite,  unless AMSC to can prove to Hughes' satisfaction that
               it was not caused by the  inversion.  The issue of whether Hughes
               is satisfied with AMSC's claim shall not be subject to dispute or
               arbitration.  If there is an anomaly on the  Satellite  after the
               Period,  the  basic  contract  provisions  shall  apply  and this
               Paragraph 7.1(3) shall no longer be applicable.


               Extended  Life  Incentives.  Following  the  THREE  THOUSAND  SIX
               HUNDRED  AND  FIFTY  (3,650)  day  period in  7.1(2)  above,  the
               Contractor shall receive Extended Life Incentive  Payments of TWO
               THOUSAND  AND  SEVENTY-FIVE  U.S.  DOLLARS   (US$2,075.00)   plus
               interest per day,  plus SEVEN HUNDRED AND  NINETY-SEVEN  CANADIAN
               DOLLARS   (C$797.00)  plus  interest  per  day,  subject  to  the
               reductions in accordance with Paragraphs 7.1(2)(c) and 7.1(2)(d).
               -------------------------

     7.2 All  Performance  Incentive  Payments  made  pursuant  to this  Article
includes  interest  accrued  from the time that the  Spacecraft  begins  earning
Performance  Incentives.  An Interest  Accrual  Factor (IAF) shall be applied to
each payment in accordance with the following formula.

                  (APRn + 1.0) x 60
         Fn =                               + 1
              ---------------------------------

                            365


     16.6  LIMITATION OF LIABILITY FOR HUGHES' WORK ON THE SPACECRAFT  INVERSION
HUGHES  MAKES NO  WARRANTY,  EXPRESS OR IMPLIED,  TO AMSC,  TELESAT OR ANY OTHER
PERSON OR ENTITY  CONCERNING  THE  SPACECRAFT  INVERSION  AND  RELOCATION OR THE
PERFORMANCE OF THE SATELLITE. AMSC SHALL INDEMNIFY AND HOLD HARMLESS HUGHES FROM
AND AGAINST ANY LOSS, DAMAGE,  LIABILITY OR EXPENSE  (INCLUDING  ATTORNEY'S FEES
AND OTHER EXPENSES OF INVESTIGATING OR DEFENDING  CLAIMS) RESULTING FROM (I) ANY
REPRESENTATION  MADE BY AMSC TO ANY THIRD PARTY  RELATING TO THIS WORK; AND (II)
ANY   CLAIMS    MADE   BY   ANY   THIRD    PARTY    RELATING   TO   THIS   WORK.
- -------------------------------------------------------------------------------










                                                          Revised by Amendment 7


ARTICLE 42: OTHER  CONDITIONS  RELATING TO THE  INVERSION  AND  OPERATION OF THE
SATELLITE

     42.1 Export Licenses

     AMSC shall  obtain all  necessary  USG export  licenses  for the  Satellite
and/or  technical  data prior to leasing the Satellite to ACTEL and  authorizing
Telesat to operate the  Satellite.  Upon  AMSC's  request,  HUGHES will  provide
limited assistance to AMSC in processing such license applications.


     42.1 Transfer of Hughes' Proprietary Information

     (a) AMSC  agrees  that the Lessee and the  Operator  ("Receiving  Parties")
     shall enter into a written agreement with AMSC ("Agreement") to protect any
     Hughes  Proprietary  Information  ("Proprietary   Information")  which  was
     provided  under  this  Contract  and which AMSC  provides  to the Lessee or
     Operator.  The Receiving  Parties  shall keep  Proprietary  Information  in
     confidence and not disclose to any person or entity, any of the Proprietary
     Information,  except as otherwise  provided  below.  This  Agreement  shall
     require  that the  Receiving  Parties  exercise  the same degree of care to
     guard  against   unauthorized   disclosure  or  use  of  such   Proprietary
     Information  as  Receiving   Parties  employ  with  respect  to  their  own
     Proprietary  Information of like importance,  but in no event,  less than a
     reasonable  degree of care.  This  Agreement  shall also  require  that the
     Receiving Parties make the Proprietary  Information available only to those
     of their employees or agents having a "need to know" in order to operate or
     maintain the Satellite; and further, that each of their employees or agents
     shall be  advised  that  they are  obligated  to  protect  the  Proprietary
     Information in a manner consistent with the Agreement.










                                                          Revised by Amendment 7


     The  Receiving  Parties  shall not be liable for the  disclosure  or use of
Proprietary Information if the same is:

     in or enters the public domain, other than by breach of this Agreement;

     known to the Receiving Parties at the time of first receipt,  or thereafter
becomes known to the  Receiving  Parties  without  similar  restrictions  from a
source other than Hughes, as evidenced by written records;

     developed by the Receiving Parties independent of any disclosure  hereunder
as evidenced by written records.

In the event  AMSC,  the Lessee or Operator  of the  Satellite  is acquired by a
competitor of Hughes,  the Parties agree that Hughes would be irreparably harmed
if any  competitor  of  Hughes,  as  determined  by  Hughes  in  its  reasonable
discretion,  were  to  acquire  access  to  any of  the  intellectual  property,
Proprietary  Information or other technology,  data or inventions  covered under
the Contract (collectively, the "Intellectual Property"),  regardless of whether
such  competitor  has an  ownership  interest in AMSC,  the Lessee or  Operator.
Accordingly,  the  Parties  agree that no  competitor  of Hughes  shall be given
access to any of the Intellectual  Property, and that should a competitor obtain
control of AMSC,  the Lessee or the  Operator  or  otherwise  be an  assignee or
transferee  of AMSC,  the  Lessee or the  Operator,  Hughes may take any and all
reasonable   steps  to  safeguard   and  protect  its   Intellectual   Property.
Notwithstanding  any  provisions  of the  Contract  requiring  arbitration,  the
foregoing  agreement may be enforced by Hughes by entry of injunctive relief, in
addition  to  all  other  remedies  available  to  Hughes  under  the  Contract,
applicable law or otherwise.










                                                          Revised by Amendment 7


     42.2 A condition  precedent to the  effectiveness of this Amendment 7 shall
be a binding agreement between AMSC and ACTEL for the lease of the Satellite and
a binding agreement  between AMSC and Telesat for the inversion,  relocation and
operation of the Satellite.