AMERICAN MOBILE SATELLITE CORP
10-K, 1997-03-28
COMMUNICATIONS SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-K
              ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1996
                         Commission file number 0-23044

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

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

    10802 Parkridge Boulevard
           Reston, VA                                         22091
 (Address of principal executive                            (Zip Code)
                offices)

Registrant's telephone number, including area code:   (703) 758-6000
Securities registered pursuant to Section 12(b) of the Act:  None
Securities registered pursuant to Section 12(g) of the Act: 
                                         Common Stock, $0.01 per value per share
                                                       (Title of class)

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such report(s), and (2) has been subject to such
filing requirements for the past 90 days. Yes X  No 
                                             ---   ---

         Indicate by check mark if disclosure of delinquent  filers  pursuant to
Item 405 of Regulation S-K is not contained  herein,  and will not be contained,
to the best of  registrant's  knowledge,  in  definitive  proxy  or  information
statements  incorporated  by  reference  in Part  III of this  Form  10-K or any
amendments to this Form 10-K. [ ]

         The  aggregate   market  value  of  shares  of  Common  Stock  held  by
non-affiliates at February 28, 1997 was approximately $342,139,827.

Number of shares of Common Stock outstanding at February 28, 1997:  25,111,180.

                       DOCUMENTS INCORPORATED BY REFERENCE
                       -----------------------------------

         Certain information in the Company's definitive Proxy Statement for its
1997 Annual Meeting of  Stockholders is incorporated by reference in Part III of
this Form 10-K.




<PAGE>



                      AMERICAN MOBILE SATELLITE CORPORATION
                      -------------------------------------

                         1996 Annual Report on Form 10-K
                         -------------------------------

                                     PART I
                                     ------

This Annual Report on Form 10-K includes "forward-looking statements" within the
meaning of Section  27A of the  Securities  Act of 1933 and  Section  21E of the
Securities  Exchange Act of 1934.  Such  statements are identified by the use of
forward-looking  words or phrases  including,  but not limited  to,  "believes,"
"intended,"   "will  be   positioned,"   "expects,"   "expected,"   "estimates,"
"anticipates" and "anticipated." These  forward-looking  statements are based on
the Company's  current  expectations.  All statements  other than  statements of
historical  facts included in this Annual Report,  including those regarding the
Company's financial position,  business strategy,  projected costs and financing
needs,  and plans and  objectives  of  management  for  future  operations,  are
forward-looking statements.  Although the Company believes that the expectations
reflected in such  forward-looking  statements are  reasonable,  there can be no
assurance  that  such  expectations  will  prove to have been  correct.  Because
forward-looking statements involve risks and uncertainties, the Company's actual
results  could  differ  materially.  Important  factors  that could cause actual
results  to  differ  materially  from the  Company's  expectations  ("Cautionary
Statements")  are disclosed under  "Business" and  "Management's  Discussion and
Analysis of Financial  Condition  and Results of  Operations,"  and elsewhere in
this Annual Report,  including,  without  limitation,  in  conjunction  with the
forward-looking statements included in this Annual Report. These forward-looking
statements  represent  the  Company's  judgment  as  of  the  date  hereof.  All
subsequent  written  and oral  forward-looking  statements  attributable  to the
Company or persons  acting on behalf of the Company are  expressly  qualified in
their entirety by the Cautionary Statements. The Company disclaims, however, any
intent or obligation to update its forward- looking statements.

Item 1.  Business.
- -------  ---------

Introduction
- ------------

American Mobile  Satellite  Corporation  ("AMSC" or the "Company") has developed
and operates North America's first high-powered, satellite-based, digital mobile
communications  system (the "SKYCELL  System").  AMSC currently offers low-cost,
high-quality  digital mobile voice,  data and dispatch  communications  services
primarily to business  customers  with a need for  nationwide,  reliable  mobile
communications  services.  Since its formation in 1988, AMSC's efforts have been
focused on completing  the design,  construction,  testing and deployment of the
SKYCELL System. The Company  successfully  launched its satellite  ("AMSC-1") in
April 1995 and initiated commercial voice service in December 1995.

The Company currently offers two kinds of service. SKYCELL(R) voice services are
interconnected  with the public switched telephone network ("PSTN").  Users make
or receive  calls using the SKYCELL  System  through  vehicle-mounted  equipment
similar  to a cellular  telephone  or mobile  radio,  specialized  maritime  and
aeronautical equipment,  transportable equipment, fixed-site installed equipment
similar  to  ordinary  wireline  service,  and  other  equipment  (collectively,
"Subscriber Equipment"). The Subscriber Equipment communicates through AMSC-1 to
the  communications  ground station (the "CGS") located in Reston,  VA, which in
turn is  interconnected  with the PSTN.  Several vendors,  including  Mitsubishi
Electric Corporation and Westinghouse Electric Corporation ("Westinghouse"), are
developing and manufacturing  Subscriber Equipment.  See "Business -- Components
of the SKYCELL System -- Subscriber Equipment."

The Company also offers SKYCELL  mobile data  services,  both satellite only and
"dual-mode," i.e.,  satellite and terrestrial,  through the public switched data
network. Users send or receive data messages through vehicle-mounted  Subscriber
Equipment,   installed  primarily  in  trucking  fleets.  These  data  terminals
communicate  through AMSC-1 through the land earth stations  ("LESs") located in
Reston,  Virginia,  and in some  cases a  switching  facility  located  in Cedar
Rapids, Iowa. See "Business -- Satellite Data Communications  Services." Several
vendors, including Rockwell Collins and Trimble Navigation, are supplying mobile
data terminals to the Company. See "Business -- Components of the SKYCELL System
- -- Subscriber Equipment".

As of December  31,  1996,  the Company  had 20,300  subscribers  on the SKYCELL
System.

                                        1

<PAGE>



History
- -------

AMSC,  a  Delaware  corporation,  was  incorporated  in May 1988 by eight of the
initial applicants for the first mobile satellite services license,  following a
determination  by the  Federal  Communications  Commission  (the "FCC") that the
public  interest  would best be served by granting  the license to a  consortium
composed  of  all  willing  and  qualified  applicants.   In  March  1991,  AMSC
transferred  the  mobile   satellite   services  license  to  its  wholly  owned
subsidiary, AMSC Subsidiary Corporation ("AMSC Subsidiary").

In August  1989,  the FCC  authorized  AMSC to  construct,  launch and operate a
mobile satellite  communications  system. For the SKYCELL System's mobile links,
the FCC  assigned to AMSC the  exclusive  license to 30 MHz of L-band  spectrum,
subject to international frequency  coordination.  L-band spectrum is considered
advantageous for mobile  communications  services because it is less affected by
radio propagation difficulties than are higher frequencies. The FCC licensed the
Company  to  provide  a  full  range  of  mobile   voice,   data  and   dispatch
communications  services via satellite to land, air and sea-based customers in a
service area consisting of the continental United States, Alaska, Hawaii, Puerto
Rico, the U.S. Virgin Islands,  U.S.  coastal waters,  international  waters and
airspace and any foreign territory where the local government has authorized the
provision of service (the  "Service  Area").  The Company is also  authorized to
provide  fixed- site voice and data  communications  services  via  satellite to
locations within the Service Area, so long as such services remain incidental to
the Company's mobile communications  services. See "Components of SKYCELL System
- -- AMSC-1". In addition to AMSC-1, the Company's license authorizes it to build,
launch, and operate two additional  geosynchronous satellites in accordance with
a specified  launch schedule,  which would be available for additional  capacity
demands of the business.

Overview
- --------

The Company  offers both voice and data  services  directly to end users through
its direct sales force and dealers as well as bulk  satellite  capacity  through
distributors,  resellers and private  networks.  The Company's service offerings
expanded  significantly  throughout 1996 and into 1997 with the  introduction of
its   SKYCELL(R)   Plus   point-to-multipoint    dispatch   service,   dual-mode
satellite-terrestrial data product, and a number of advanced features, including
4800 bits per second ("bps")  circuit  switched data service as an added feature
of the voice service.  In addition,  in 1996 and into 1997, an expanded range of
both voice and data terminals became available for use in land mobile, maritime,
fixed-site,  aeronautical and  transportable  environments.  Most recently,  the
Company has released a product for the  recreational  vehicle  market that pairs
SKYCELL services with direct  broadcasting  satellite  services,  and Mitsubishi
Electronics  Corporation  has  released  its  OmniQuest(R)  lightweight,  laptop
transportable  unit. See "Business -- Satellite  Telephone  Services;  Satellite
Data Communications Services."

The  Company's  sales  organization  and  distribution  strategies  reflect  its
experience  during  early 1996.  The Company  began 1996 with a sales effort and
distribution   strategy  organized  along  product  lines,  with  a  significant
organization and focus on consumer customer  opportunities.  A number of factors
led the Company to reassess  and  restructure  its efforts,  including:  greater
cellular  build-out  levels  prior  to  product   introduction  than  originally
anticipated;  minimal activity in cellular  distribution  channels,  and for the
satellite roaming product  developed for that consumer market;  limited consumer
market   receptivity  to  the  Company's  product  and  services;   slower  than
anticipated  subscriber  activations;  technical product  equipment  limitations
disparately  impacting the consumer  market;  and  challenges in  establishing a
nationwide retail  distribution  channel with anticipated sales volume, cost and
technical  issues.  See  "Management's  Discussion  and  Analysis  of  Financial
Condition and Results of Operations -- Overview"

The Company now has an integrated product sales offering, divided along regional
rather than product lines.  Similarly,  the Company's sales experience indicated
that,   in   general,    its   products    were   most   highly    utilized   in
business-to-business,   fleet  and  remote  site  services   where   alternative
communications  services  were  unavailable.   Therefore  the  Company's  direct
marketing  program now addresses the requirements of large end-users in a number
of focused markets, including transportation,  telecommunications and utilities,
and  natural  resources.  The Company  accordingly  reduced its focus on retail,
consumer  products,  including  the  termination  early in 1997 of its satellite
roaming service,  which had provided  interoperability  with and billing through
cellular communications systems. All other voice products continue to be offered
to cellular  customers as an extension product to their cellular  service.  With
the  termination  of the  satellite  roaming  service,  the cellular  authorized
service provider program has been terminated, and carriers have been offered the
opportunity to distribute the voice product line.


                                        2

<PAGE>




The  Company  faces  substantial  competition  in the  markets  for all of these
services.  See  "Business--Competition."  As a  nondominant  common  carrier and
commercial  mobile  radio  service  provider,  the  Company  is not  subject  to
traditional public utility rate-of-return  regulation in setting its charges for
services.  See "Business --  Regulation."  The Company's  operating  results and
capital and liquidity needs have been materially  affected by delays experienced
in the  development  and deployment of the SKYCELL System and may continue to be
impacted in 1997. See "Part II, Item 7, Management's  Discussion and Analysis of
Financial  Condition and Results of  Operations  -- Overview."  See "Business --
Technological Developments."

SKYCELL Satellite Voice Services
- --------------------------------

The Company offers  satellite  telephone  services ("STS") on a nationwide basis
under the SKYCELL(R) name.  Dispatch or private voice network ("PVN") service is
offered under the SKYCELL  Plus(R)  brand.  As its name  suggests,  STS provides
simultaneous two-way connection between users. STS user terminals look much like
cellular  telephones and can reach any other telephone connected to the PSTN. On
the other  hand,  with  SKYCELL  Plus many users share a single  connection  and
communicate using  push-to-talk  handsets.  In keeping with its integrated sales
strategy,  the Company markets both STS and PVN to the same target markets,  and
some customers subscribe to both services.

STS currently supports two-way circuit-switched voice and 4800 bps data services
interconnected  with the PSTN.  The Company offers a wide range of STS terminals
developed to address the particular  communications  needs of subscribers.  This
diversified  product offering lets the Company address niche markets and changes
in market demand.  The Company  markets STS to businesses  that have  nationwide
coverage  requirements,  including  those for whom  nationwide  dispatch meets a
fleet  communications  need;  those that operate in  geographic  areas that lack
significant   terrestrial  coverage,   including  natural  resource  extraction;
utilities  and  telecommunications  companies  that require  backup and restoral
support;  maritime users seeking  expanded and or less costly  coverage for both
commercial and pleasure  vessels.  Others served include  aeronautical  markets,
rural areas unserved by fixed telephony, and public safety organizations.

Generally,  the Company  charges its STS  subscribers a regular  monthly  access
charge and a per minute usage charge for all calls whether placed or received by
the  Subscribers.  The monthly  access charge and per minute usage charge to STS
subscribers  vary  according to the  Subscriber  Equipment  configuration  (land
mobile,  maritime, fixed site, aeronautical or transportable) being used and the
power and gain characteristics of the particular subscriber  equipment.  SKYCELL
Plus  service is  presently  priced on a set  monthly  service  fee basis  which
includes a certain  number of free minutes of usage.  In  practice,  few SKYCELL
Plus users exceed this  minimum.  SKYCELL Plus rates also vary  according to the
coverage available to the subscriber.

Satellite Data Communications Services
- --------------------------------------

The Company also offers nationwide  "store-and-forward" mobile data or messaging
communications  services in two basic forms:  1) a  satellite-only  product that
operates over AMSC-1;  and 2) a multi-mode,  satellite-terrestrial  product with
least cost routing,  i.e. that routes calls  terrestrially and, when terrestrial
service is unavailable, over AMSC-1.

Store-and-forward service provides text-message communications between groups of
mobile or fixed data  terminals  and a single "hub" which is usually  located in
the customer's dispatch center. Current applications of this service include one
way and two way messaging,  integral GPS, automatic  position  determination and
reporting,  and  various  types of remote  monitoring.  Subscribers  using  this
service  and  examples  of  its  applications  include  long  distance  trucking
companies  (for  vehicle  location  monitoring  and  messaging  en  route),  law
enforcement  agencies (for remote data transfer),  energy  companies (for remote
monitoring  of oil wells and  deliveries)  and waterway and rail  transportation
companies (for remote  monitoring of refrigeration  units in railcars  dispersed
throughout the country). However, in a store-and-forward system, an open line of
communication   is  not  established   between  the  sender  and  receiver  and,
accordingly,  this service is not  appropriate  for certain  applications  where
direct or real-time communications are necessary.

                                        3

<PAGE>



The Company  offers both  satellite-only  and  multi-mode  satellite-terrestrial
mobile data service using LES's located at the Company's headquarters,  together
with a switching  facility for the multi-mode  products located at the Company's
facilities in Cedar Rapids,  each in  conjunction  with AMSC-1.  The  multi-mode
service  offering  currently  provides  terrestrial  service  through  resale of
service  provided by ARDIS  Company  ("ARDIS")  in the United  States,  with the
multi-mode terminal selecting the least cost transmission path.

The satellite only data service was the Company's  first  offering.  The Company
expanded  its  mobile  data  business   late  in  1996  by  acquiring   Rockwell
International  Corporation's  ("Rockwell")  multi-mode  mobile  data and  global
position  tracking  service  for  commercial   trucking  fleets.   The  acquired
multi-mode   communications   system  uses  both   satellite-   and   land-based
technologies   to  provide   commercial   trucking   fleets  with  two-way  data
communications and global automatic vehicle location  services,  no matter where
their vehicles travel throughout North America.  Land-based  technology provides
communications  while  vehicles  travel in urban areas where tall  buildings may
block  the line of sight to the  satellite;  satellite  technology  ensures  the
availability  of  communications  while  vehicles  travel  through  areas  where
land-based coverage is not available.

Prior to the  transaction,  Rockwell  was a  private  network  customer  and had
purchased  satellite  capacity  from the  Company  on  AMSC-1,  and  terrestrial
capacity from ARDIS. In the transaction, the Company assumed Rockwell's existing
customer contracts and acquired Rockwell's system for the multi-mode mobile data
service, as well as Rockwell's rights to the multi-mode equipment. The assets of
the business were acquired  through the assumption of the various  contracts and
obligations of Rockwell  relating to the business,  including its agreement with
ARDIS;  no additional,  direct payments were made to Rockwell under the terms of
the Asset Sale Agreement dated as of November 22, 1996.

Primary Markets and Sales Channels
- ----------------------------------

The Company has  targeted six primary  markets in 1997.  In addition the Company
sells  capacity  on  the  AMSC-1   satellite  in  bulk  and  maintains   certain
relationships  with other  companies to expand its coverage of certain  targeted
markets or to reach additional markets, particularly aeronautical.

The primary STS markets targeted by the Company are:

          Transportation.  The Company  offers  large  carriers  with nationwide
          fleets a variety of data and voice  products  including  SKYCELL Plus.
          These  products and  services  permit  fleet  managers to  communicate
          simultaneously  or  individually  with  fleets  of  trucks,  railcars,
          aircraft and ships.  Drivers use SKYCELL  Plus service to  communicate
          with one  another and with fleet  managers  by using a  "push-to-talk"
          handset.  Because AMSC-1's power output remains constant regardless of
          the number of mobile telephones receiving a transmission, this service
          is expected to be an attractive and competitively  distinguishing  use
          of the SKYCELL System.

          The  transportation  sector is the  largest  market for the  Company's
          mobile  messaging data service.  Trucking  companies use the Company's
          communications services to maintain nearly constant nationwide contact
          with drivers.  Without such a service,  drivers for many carriers must
          stop at pay phones to call a dispatcher  to report their  location and
          schedule status.  Because dispatchers must rely on drivers to initiate
          contact,  carriers  sometimes  cannot  divert  trucks  en  route  when
          customer orders are placed or changed. Using the Company's mobile data
          service,  information  related to inventory control and billing can be
          relayed  directly to and from trucks in the field.  In  addition,  the
          data  service  eliminates  the concern a number of carriers  have with
          respect  to  driver  over-use  of voice  communication  products.  The
          Company  expects that trucking  firms will  subscribe to the Company's
          services  to  improve  customer  service,   to  increase  vehicle  and
          equipment utilization, to enhance driver satisfaction and performance,
          and to improve  profitability  through overall fleet  coordination and
          cost savings.

          The  Company's  data service is offered  primarily  through its direct
          sales force. In addition, in connection with the Rockwell acquisition,
          the Company  acquired a distributor of its product in Canada,  Stratos
          Mobile Networks (formerly New East Wireless Telecommunications) which,
          together  with the  Company,  has  developed  and offers a  multi-mode
          product  operating over AMSC-1,  as well as over the United States and
          Canadian terrestrial networks.

                                        4

<PAGE>



          Maritime Markets.  The maritime market,  including commercial vessels,
          cruise ships and large pleasure vessels, as well as oil rigs and other
          natural  resource  extraction  businesses,  is  currently  the largest
          market for the Company's  voice  services,  representing  27% of voice
          subscribers.  The Company  offers its voice services to maritime users
          through  several  sales  channels.   First,   the  Company  has  agent
          relationships  with a number of  marine  electronics  dealers  located
          throughout  the country.  The dealers  receive a  commission  for each
          sale,  including a portion of airtime  revenue.  Second,  three of the
          Company's most significant  value-added  service  providers  ("VASPs")
          have  targeted  the  maritime   markets,   and   presently   represent
          approximately 77% of all maritime subscribers.

          The Company and its resellers  offer a range of  Subscriber  Equipment
          suitable  for  a  variety  of   applications.   The  largest   include
          multi-channel  units  for  installation  on  cruise  ships.  Among the
          smallest is the WaveTalk(R)  unit recently  introduced by Westinghouse
          and the Tracphone(R) available from KVH Industries,  Inc. ("KVH"). The
          Company  believes that  maritime  customers are likely to purchase its
          products and services because they are more compact and less expensive
          to acquire and use than the products and services offered by Inmarsat.
          See "Business - Competition".

          Fixed Site Telephony.  The Company offers fixed site and transportable
          communications   services,   including   voice  and  data,  to  homes,
          businesses,  government  and other fixed sites in areas lacking access
          to wireline or cellular communications systems. Significant subscriber
          opportunities  for this fixed site and  transportable  service include
          mines, oil rigs, and other natural resource extraction businesses,  as
          well as subscribers  desiring back-up  communications  capabilities in
          the  event of  catastrophic  loss of access to  wireline  or  wireless
          systems,  such as the  Federal  Aviation  Administration  Air  Traffic
          Control Center.

          Telecommunications/Utilities.  The Company provides back-up,  restoral
          and  mobile  communications  services  to the  telecommunications  and
          utilities  industries  to  ensure   communications   capabilities  and
          expedited   restoral  of  service  where   terrestrial   services  are
          unavailable   as  a  result  of  coverage   limitations  or  emergency
          situations.

          Government  and Public Safety  Organizations.  The Company  offers its
          services  to federal,  state and local  government  and public  safety
          organizations,  such as the  American  Red  Cross,  Federal  Emergency
          Management  Administration,  law enforcement,  border patrol and other
          federal, state and local government agencies needing seamless coverage
          for voice and data communications.  The Company anticipates addressing
          this market largely  through system  integrators,  who will resell the
          service as part of their other products and services.

          Aeronautical  Markets:  Corporate  and General  Aviation.  The Company
          offers  communications  services to the corporate and general aviation
          markets,  but not to commercial  airlines.  CAL  Corporation of Canada
          ("Cal") has developed and produced the specialized aeronautical mobile
          terminal which was introduced in the second half of 1996.  During 1996
          and into 1997, the Cal  aeronautical  unit was certified for use on 39
          aircraft types, representing 70% of the corporate and general aviation
          aircraft.  See  "Business  --  Components  of the  SKYCELL  System  --
          Subscriber  Equipment." With this equipment,  aircraft  passengers can
          make telephone calls and send and receive data or facsimiles  anywhere
          in the Service  Area.  This product is sold through CAL's direct sales
          group and CAL's dealer network.

Distribution Arrangements
- -------------------------

The Company distributes STS through authorized  dealers,  through its own direct
marketing sales force,  and through other  distributors,  including  VASPs.  The
standard dealer  agreement  provides that the dealer will serve as the Company's
agent for sales of the service and will provide marketing and subscriber service
(but not billing  and  collection)  functions  to support  the  development  and
maintenance of a retail  subscriber  base. In return for these  activities,  the
dealer receives a specified percentage of the revenues generated for the Company
by the subscribers  recruited by the dealer.  In addition,  the Company pays the
dealer a fixed amount for each newly-activated subscriber, subject to chargeback
if the subscriber  does not continue  service for 180 days. The standard  dealer
agreement has an initial term of one year, that renews for one year terms unless
earlier  terminated.  Subscriber  Equipment  is  purchased  from the Company and
resold by the dealers to the subscribers.


                                        5

<PAGE>




Bulk Satellite Capacity
- -----------------------

The Company offers subscribers alternative programs to obtain satellite capacity
in bulk: (i) "Private Network  Customers  ("PNCs")," which purchase service on a
channel  equivalent basis; and (ii) VASPs, which buy minutes and/or kilobytes of
system capacity in bulk. Service sold to VASPs (bulk minutes or kilobytes) is on
an on-demand basis,  contending with other subscribers for capacity.  Channel or
channel equivalents, however, are dedicated to the subscriber once purchased and
paid for,  and are not  subject  to other  sale,  or to  preemption  except  for
emergency purposes as provided in AMSC's FCC authorization.

Both PNC's and VASP's  resell the  service to their own  customers,  setting the
price, taking the risk of collection,  and  private-labelling  the service. They
also  purchase  and  resell  subscriber  equipment.  VASP's  typically  purchase
subscriber  equipment from AMSC for resale;  PNC's,  whose  applications  of the
Service are  typically  very  different  from STS,  have built and/or  purchased
special purpose subscriber equipment from third parties.

VASP's may or may not install and maintain their own network switching equipment
and  facilities,  routing  traffic  from the CGS through  their own switches for
delivery to the PSTN. PNC's maintain their own network operations facilities.

AMSC has entered into  approximately 12 contracts for  approximately $75 million
of capacity over five years from VASP's and PNC's.


Components of the SKYCELL System
- --------------------------------

The SKYCELL System consists principally of AMSC-1, the CGS and the LESs. AMSC-1,
the CGS and the LESs have been  constructed for the Company at its expense.  The
Company has also entered into  contracts  with  vendors who are  developing  and
manufacturing Subscriber Equipment.

AMSC-1.  AMSC-1 is a Hughes HS-601 system with a payload  specifically  designed
for the SKYCELL System by Spar Aerospace Ltd.  ("Spar").  The bus is composed of
the spacecraft and the subsystems  used to maintain the proper  operation of the
communications  payload.  AMSC-1's estimated in- orbit service life after launch
exceeded ten years.

AMSC-1 is designed to produce six  overlapping  spotbeams  capable of  providing
coverage of the Service Area. In March 1996, the Company  reconfigured AMSC-1 to
provide substantially the same coverage using only five spotbeams,  one covering
the eastern half of the United  States and the other four covering the remaining
Service Area. See "Business -- Technological Developments; Satellite Insurance."
As  reconfigured,  AMSC-1  allocates  half of the  available  power  to the beam
covering the eastern half of the United States and half of the  available  power
to the four beams  covering  the  remaining  Service  Area.  Within each of such
allocations of power,  the amount of power in any spotbeam may be adjusted based
upon  end  user  requirements.  See  "Business  --  Technological  Developments;
Satellite Insurance"

The  availability  and quality of service  depends,  in part,  on whether or not
there is a line of sight to  AMSC-1  from the  Subscriber  Equipment.  The angle
between the  horizon  and AMSC-1  from any point in the Service  Area (the "look
angle") is a general indicator of the availability of a clear line of sight. Due
to the location of AMSC-1 over the equator and the  curvature of the Earth,  the
full  range of fixed  site and  mobile  satellite  services  will  generally  be
available  where the look angle is greater  than  20(degree),  except in certain
cases where there are intervening hills, buildings, or other obstructions. Fixed
site and mobile  satellite  services  generally  will be available also in areas
between the 5(degree)  and the  20(degree)  look angle  limits,  provided that a
direct line of sight to AMSC-1 is  available.  Services  will  generally  not be
available  in the  Service  Area  where the look angle is below  5(degree),  but
certain  applications  (including  fixed site) may be  available  at look angles
below 5(degree).


                                        6

<PAGE>



Once a satellite is placed at its orbital  location,  ground stations control it
until the end of its  in-orbit  lifetime.  The  Company has  contracted  with an
affiliate of Hughes Aircraft Company ("Hughes  Aircraft") to monitor and control
AMSC-1 from telemetry,  tracking and control ("TT&C")  facilities in El Segundo,
California; Castle Rock, Colorado; and Spring Creek, New York.

Ground Segment and LES. The CGS serves as the central voice control facility for
voice-based  network  traffic  on the  SKYCELL  System,  providing  call  set-up
functions,   connection  to  the  public  switched  telephone  network,  billing
information  for  each  call,  as  well  as  network  security,  monitoring  and
management. The CGS also provides subscriber service information, maintains call
and service records, keeps network  configurations and monitors problems.  Other
functions include monitoring  frequency spectrum usage by AMSC-1,  verifying the
performance of all network  elements and providing  preemptive  access to AMSC-1
for special aeronautical and safety services.

The CGS includes a feeder-link  Ku-band earth station, a network  communications
controller,  a network  operations  center and other equipment needed to support
the  interconnection  of the SKYCELL System with the public  switched  telephone
network.  The feeder-link  earth station is presently the Company's only gateway
station.  The network  communications  controller  provides automatic  real-time
control of the CGS, allocates channel frequencies for call set-up between mobile
telephones  and the  feeder-link  earth  station,  and provides  network  access
security.  The network  operations  center  provides  centralized  monitoring of
systemwide operational performance, conducts testing and maintenance activities,
and performs certain  administrative  functions in connection with the operation
of the SKYCELL System.

The CGS uses  hardware  that  generally  is  commercially  available  or readily
adaptable commercial  equipment,  except for the channel unit and network access
processors, which were designed by EF Data Corp.

AMSC  jointly  owns  certain  patents,  technical  data and  other  intellectual
property,   including  the  final  mobile  terminal  performance   specification
("FMPS"), developed by Westinghouse,  with the Canadian mobile satellite service
provider.  See "Business -- Relationship with TMI". The Company  separately owns
other  patents,  technical  data and other  intellectual  property  developed by
Westinghouse at the Company's sole expense. Certain of the intellectual property
used in the  development  of the CGS is owned by  Westinghouse  or licensed from
others.  The  Company  believes  its  ownership  of and  rights to  intellectual
property relating to the CGS is sufficient for its business purposes.

The LESs  located in Reston,  Virginia,  together  with the  switching  facility
located at the Company's offices in Cedar Rapids,  provide similar functions and
capabilities  for the  Company's  mobile  data  products as does the CGS for the
Company's  voice  products.  Similar to the CGS, the LESs uses  hardware that is
generally  commercially  available or readily  adaptable  commercial  equipment,
except for the channel units that are provided by Hughes  Network LTD. There are
currently four LESs that are located at Reston and additional  LESs may be added
as capacity growth demands.

The  LESs use the  same  feeder-link  Ku-band  earth  station  as the CGS and is
allocated,  within the total AMSC allotment,  unique power and spectrum for that
service.  The LES architecture is a store and forward  architecture based on the
Inmarsat-C  standard  but is not  interconnected  with  Inmarsat  hubs.  The LES
provides the data call  processing  for  messages,  via AMSC-1,  to and from the
mobile terminals.  Also, the LES provides  terrestrial  interface via the Public
Switch Data Network (PSDN) for access and  transmission of messages to customers
sites. The LESs also have a network operations center that provides  centralized
monitoring  and  administrative  functions  in  connection  with the mobile data
service.

The  multi-mode  messaging  service has an additional  switching  center that is
located in Cedar Rapids. This station provides for switching between the LES and
the terrestrial  network that is utilized for the multi- mode messaging service.
The Cedar Rapids center provides network operations for that locale.

The Company's  headquarters  in Reston,  Virginia,  currently  house the network
operations center, the network communications controller, the gateway switch and
the radio channel units. There are two Ku-band radio frequency facilities,  each
consisting of an antenna and radio frequency electronics: one site is located at
the Company's  Reston,  Virginia facility and a leased diversity site is located
several  miles  away in  Alexandria,  Virginia.  The  diversity  site is used to
provide backup service during periods when heavy rain reduces the quality of the
feeder link  signals at the main  facility.  Each radio  frequency  facility can
support the full traffic load of the gateway station. See "Item 2, Properties."

                                        7

<PAGE>




Subscriber Equipment.  Mobile satellite voice telephones are offered in a number
of different  configurations to meet specific market needs and to have a variety
of  features  and  options.  Mobile  satellite  telephones  consist of an L-band
transceiver,   a  handset  or  other  appropriate  interface  depending  on  the
particular  application,  and an antenna.  The mobile satellite voice telephones
use a voice codec operating at 6.4 Kbps (including error-correcting codes).

Mobile  satellite  telephones  are  currently  available in land mobile  vehicle
installed, fixed site, maritime,  aeronautical, dual mode SKYCELL/direct to home
satellite television and fully transportable (i.e., battery powered and packaged
in a brief case) configurations.

Subscriber  Equipment  for STS and PVN includes  data  interface  ports to allow
connection to communications  accessories such as personal computers, and global
positioning  satellite  ("GPS")  tracking  devices.  Other  configurations  have
additional features, such as SKYCELL Plus,  point-to-multipoint  communications.
Future  configurations  may include one-way messaging or paging (outbound from a
central facility),  and reporting  (one-way inbound from remote locations).  The
addition  of GPS  services  to the voice  terminals,  if  available,  requires a
separate antenna.

Manufacturers  of Subscriber  Equipment have  developed  several types of mobile
antennas  for use with the  SKYCELL  System.  The  size of  antenna  used is the
principal determinant of the amount of satellite power required. Larger antennas
with  higher  gain  require  less  satellite  power  to  complete  voice or data
communications  than do smaller antennas with lower gain. As a result,  the rate
charged for service using higher gain antennas is generally  lower than the rate
charged for service using lower gain antennas.

The  Company  does  not  itself  manufacture  or  independently  develop  mobile
telephones.  The Company has entered into separate contracts (the "MT Production
Contracts") with  Westinghouse  and Mitsubishi  Electric  Corporation  ("Melco")
pursuant to which those  manufacturers  have,  at their own  expense,  developed
mobile voice telephones based on the FMPS. In return, the Company has granted to
Westinghouse and Melco the shared right to be the co-exclusive  manufacturers of
the  mobile  telephones  covered by the FMPS under  certain  circumstances.  The
co-exclusivity period is for up to 18 months after the Company's commencement of
commercial  voice  service in December  1995,  subject to extension in specified
circumstances.

The MT  Production  Contracts  contemplated  that  Westinghouse  and Melco would
distribute  and inventory the mobile  telephones  for offer and sale directly to
the Company's subscribers.  While, in certain  circumstances,  the manufacturers
have  distributed  their  products  directly,  the Company to date has assumed a
considerable  role in  purchasing  and  inventorying  this  equipment  from  the
manufacturers for sale to its subscribers  directly,  as well as through dealers
and VASPs. See "Management's  Discussion and Analysis of Financial Condition and
Results of Operations; Overview; and Liquidity and Capital Resources".

The MT Production  Contracts  also provide for the  development  of  specialized
mobile  telephones and related license of the FMPS to  manufacturers  other than
Westinghouse  and  Melco,   under  certain   circumstances.   Pursuant  to  this
arrangement,  Cal has  developed an  aeronautical  mobile  telephone  based on a
Westinghouse   transceiver  and  antenna  control  unit;  KVH  has  developed  a
high-gain,  actively stabilized maritime telephone,  the Tracphone(R) based on a
Melco transceiver;  International  Connectors and Cable Corporation  ("ICC") has
developed the fixed site, debit phone and Datron/Transco,  Inc. has integrated a
single antenna,  SKYCELL and direct  broadcasting  satellite  television service
unit for recreational  vehicles,  boats and trucks market. In addition,  each of
Westinghouse and Melco have developed  specialized  maritime,  transportable and
fixed site units for use on the SKYCELL System.

In certain circumstances,  private network subscribers (including resellers) may
also  use  mobile  telephones  other  than  those   manufactured  by  Melco  and
Westinghouse.



                                        8

<PAGE>



In connection with its mobile data communications service, the Company presently
has an  agreement  with  Trimble  Navigation,  Inc.  ("Trimble"),  to supply its
satellite-only   data  unit.   The  Company  has  a  remaining   commitment   of
approximately 7,500 units under its outstanding agreement with Trimble.

In addition, in connection with the Rockwell  transaction,  the Company acquired
approximately  5,000  multi-mode  data   satellite-terrestrial   terminals  from
Rockwell to be delivered in 1997 and into 1998 without  payment from the Company
to Rockwell.  Under the terms of its Asset Sale  Agreement  with  Rockwell,  the
Company also received a  manufacturing  commitment  from Rockwell to continue to
supply the multi-mode  units to the Company,  through 1997 and into 1998,  under
certain  commercial terms and conditions.  The Company has not yet exercised any
options available to it to acquire additional units under that Agreement.  Under
the terms of the Rockwell transaction,  the Company was also assigned certain of
Rockwell's rights to the multi-mode, satellite-terrestrial unit technology, with
an intent of enabling  the  Company to produce  the units  through a third party
manufacturer.

Delays occurred in the development and manufacturing of the currently  available
configurations of mobile telephones.  Delays have also occurred and may continue
to be encountered in the development of additional  models of mobile  telephones
and  other  Subscriber  Equipment.  The  development  of  additional  Subscriber
Equipment may require  additional  capital  investment by the Company,  and such
equipment will require regulatory approval. See "Business -- Regulation."

Delays in sale of  inventory,  or a  mismatch  between  inventory  and  customer
demand, may result in significant  capital and liquidity issues for the Company.
See "Management's  Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources".

Technological Developments; Satellite Insurance
- -----------------------------------------------

The SKYCELL  System is highly  complex and took many years and great  expense to
develop.  The  introduction of additional  services may require the development,
manufacture,  integration and testing of  technologically  advanced  components.
Unforeseen problems occurred in the testing and deployment of the SKYCELL System
which added to its cost and  delayed its  completion,  and  additional  problems
could occur in the future.

AMSC-1 was fully  deployed and  operational  on May 6, 1995.  As required by its
loan agreements,  the Company obtained insurance in the amount of $250.0 million
to cover in-orbit failure, including a partial failure, of AMSC-1 (the "In-Orbit
Insurance").

As  previously   reported,   AMSC-1  has,  in  the  past,   experienced  certain
technological  anomalies,  most  significantly with respect to its eastern beam,
which resulted in the Company's  receipt of $66.0 million of insurance  proceeds
(as discussed  below,  see  "Management's  Discussion  and Analysis of Financial
Condition and Results of Operations -- Liquidity and Capital Resources").  While
the Company  knows of no problem with any other beam,  there can be no assurance
that the satellite will not experience subsequent anomalies that could adversely
impact the Company's financial condition, results of operations and cash flows.

Following  receipt of the  insurance  settlement,  the  Corporation  renewed its
in-orbit  insurance  policy for a term of October  4, 1996,  through  October 5,
1997,  in the amount of $184  million to cover  in-orbit  failure,  including  a
partial failure, of AMSC-1 (the "In-Orbit Insurance").

The loss payment under the In-Orbit Insurance is determined  pursuant to a total
or partial loss formula.  For example,  if 50% of AMSC-1's insured capability or
estimated remaining life is lost, then a constructive total failure is deemed to
have  occurred,  and the Company  would be entitled to the full insured  amount.
Loss of the  Alaska/Hawaii  and Caribbean  spotbeams would  constitute a partial
failure,  and the Company would receive 10% of the insured  amount for each beam
lost.  Under the In-Orbit  Insurance,  the loss of a CONUS spotbeam is deemed to
constitute a constructive total failure.

Under  certain  conditions,  with respect to certain  frequency  and  geographic
losses,  the  Company  would  receive  payment  for  partial  loss of  Satellite
capacity. The In-Orbit Insurance provides that the amount of a partial loss must
exceed 5% of  AMSC-1's  insured  capability  before the  Company is  entitled to
receive  any  payments  from such  partial  failure,  but upon  reaching  the 5%
threshold  the loss  payment  covers  the  entire  loss,  including  the 5%. The
In-Orbit Insurance excludes from coverage certain  performance margins customary
for such policies.  The In-Orbit Insurance also contains exclusions customary in
such policies. The exclusions are, inter alia, (i) insurrection and similar acts
or  governmental  action to prevent such acts;  (ii)  hostile or war-like  acts;
(iii)  governmental  confiscation;  (iv) any laser,  directed  energy or nuclear
anti-satellite device; (v) nuclear reaction contamination;  (vi) electromagnetic
or radio  frequency  interference;  (vii)  willful  or  intentional  acts of the
Company and its  agents;  and (viii)  certain  third  party  claims  against the
Company.

                                        9

<PAGE>




A portion of the  proceeds  from the  In-Orbit  Insurance  must be used to repay
indebtedness  and the remaining  proceeds  would be  insufficient  to construct,
launch  and  insure  the  launch  of a  replacement  satellite.  There can be no
assurance that additional  financing will be available to construct,  launch and
insure a  replacement  satellite  or, if  available,  will be available on terms
favorable to the Company.

Relationship With TMI
- ---------------------

TMI's System.  The SKYCELL System has been implemented in coordination  with the
substantially  identical  mobile  satellite  system  of TMI  Communications  and
Company,  Limited  Partnership  ("TMI"), a Canadian limited partnership that has
been licensed to provide mobile voice and data services via satellite in Canada.
The general partner of TMI is a wholly-owned  subsidiary of BCE Inc. (previously
Bell  Canada   Enterprises   Inc.)  ("BCE"),   Canada's   largest   provider  of
telecommunications  services. The Company's and TMI's satellites and fixed voice
ground segments have been  constructed by the same  manufacturers,  enabling the
Company  and TMI to benefit  from shared  nonrecurring  development  costs.  See
"Business -- Components of the SKYCELL System."

Arrangements  for  Sharing  of  Capacity.  In  connection  with the  design  and
construction of their respective mobile satellite  communications  systems,  the
Company and TMI entered into an agreement (the "Satellite  Capacity  Agreement")
which, among other things, provides for the Company and TMI to be able to obtain
capacity  on  the  other's   satellite  at   negotiated   rates  under   certain
circumstances.  Implementation of the Satellite  Capacity Agreement requires the
approval of the FCC, may require the  approval of the Canadian  Radio-Television
and  Telecommunications  Commission  ("Canadian  CRTC") and will be submitted to
Industry Canada for review. See "Business -- Regulation."

The  Satellite  Capacity  Agreement  provided  that the party that  launched its
satellite  first would make capacity  available to the other at specified  rates
for up to six months;  pursuant to this option, TMI acquired  approximately $1.3
million of capacity on AMSC-1  prior to its launch.  This  capacity  utilization
terminated  in June 1996,  following  transition  of TMI's  customers to its own
successfully launched satellite.

The Satellite  Capacity Agreement also provides that, if each of the Company and
TMI has at least one satellite in commercial service,  and one party's satellite
is at full capacity while the other party has surplus capacity, the party having
surplus capacity will, upon request, make such surplus capacity available to the
other party on a month to month basis (or such longer term as may be negotiated)
upon  specified  terms and  conditions.  However,  if TMI's  satellite  is fully
utilized,  the Company would not be able to obtain  surplus  satellite  capacity
from TMI.

The Satellite  Capacity  Agreement  also provides that if one party's  satellite
suffers a partial or complete launch or in-orbit failure, it will be entitled to
receive  from the other party (and the other party is required to provide to it,
regardless  of  whether  their  satellite  is fully  utilized)  up to 50% of the
capacity  of the  other  party's  functioning  satellite  until  it  launches  a
replacement satellite. During the first year following such failure, there would
be no charge for such capacity; for the following 30 months, such capacity would
be available at specified  rates. In the event of a failure of TMI's  satellite,
the reciprocal backup capacity  arrangements could have an adverse effect on the
Company's   business.   Providing   capacity  to  TMI  on  AMSC-  1  under  such
circumstances  would  result in less  available  capacity to provide  commercial
services at  potentially  higher  rates to the  Company's  own  subscribers.  In
addition,  in the event of a failure of AMSC-1,  if the Company  received backup
capacity  from TMI,  the amount of restoral  capacity  available  to the Company
would be limited  to 50% of the  capacity  of TMI's  satellite,  resulting  in a
decrease in the revenue generating capability of the SKYCELL System.




                                       10

<PAGE>

Potential International Mobile Satellite Service Activity
- ---------------------------------------------------------

The United  States and Canada  are not the only  countries  developing  regional
mobile  satellite  service  systems.  Australia,   Mexico,  Japan,  the  Russian
Federation  and Brazil have or plan to have their own domestic  and/or  regional
mobile satellite service systems. The Russian Federation already has a low-power
system in  operation.  Australia's  satellite  was launched in August 1992.  The
Mexican  satellite  was launched  during  November  1993 and the Mexican  ground
segment uses the same CGS and Subscriber Equipment technology as AMSC.

In addition,  several entities have proposed  separate mobile satellite  systems
for Africa and Asia that would utilize  high-powered  geosynchronous  satellites
capable of communicating with hand-held telephones.  Three of these entities are
Afro-Asian  Satellite  Communications  ("ASC");  ASEAN Cellular System ("AceS"),
with  sponsors in Indonesia  and  Thailand;  and Asia Pacific  Mobile  Telephone
("APMT"),  with  sponsors  in the  Peoples'  Republic  of China  and  Singapore.
According  to  published  reports,  the ASC and APMT  systems are to be built by
Hughes, and the AceS system will be built by Lockheed Martin.

These  systems are  incompatible  with the SKYCELL  System,  but may  eventually
encourage development of compatible technical standards for mobile terminals and
network access that the Company may be able to take advantage of in the future.

The  Company  is  capable of  providing,  and is as a matter of  general  policy
permitted  by the FCC to  provide,  service to  Central  America,  Colombia  and
Venezuela, but will require the permission of both the FCC and local authorities
before doing so.

Competition
- -----------

The mobile communications industry is highly competitive and is characterized by
constant  technological  innovation.  The industry  includes  major domestic and
international  companies,  many of which have financial,  technical,  marketing,
sales,  distribution and other resources substantially greater than those of the
Company and which  provide,  or plan to provide,  a wider range of services than
will be provided by the Company.

The  Company's  products  and services  compete with a number of  communications
services,  including  existing  satellite  services,  terrestrial  air-to-ground
services,  and terrestrial  land-mobile and fixed services, and may compete with
new technologies in the future. A number of the Company's competitors can or may
be able to provide  services  without  certain  characteristics  of the  SKYCELL
System  that may affect end user demand  such as the  line-of-sight  requirement
associated  with  satellite   communications,   the   quarter-second   delay  in
communications  associated with geosynchronous  satellites,  the cost of service
and the cost and design of Subscriber Equipment.  See "Business -- Components of
the SKYCELL System."

The  FCC has  recently  allocated  large  amounts  of  additional  spectrum  for
communications  uses or potential uses that could compete with the Company,  and
additional allocations of spectrum for such uses may occur in the future.

Satellite   Services.   L-band   mobile   satellite   services   are   available
internationally  through  Inmarsat,  a consortium of 70 countries  that provides
low-power mobile communications services by satellite.  Inmarsat offers maritime
voice, facsimile and data services.  Inmarsat provides services in the Atlantic,
Pacific and Indian Ocean regions, using capacity on a combination of satellites.
In addition  to  operating  several of its own  dedicated  satellites,  Inmarsat
leases  capacity  from  a  number  of  sources,   including  the   International
Telecommunications  Satellite  Organization  ("Intelsat"),  the  European  Space
Agency  and  COMSAT.  Many of these  satellites  cover at least a portion of the
United  States.  Inmarsat's  charter  authorizes  it  to  offer  satellite-based
aeronautical  service,  and Inmarsat is in the process of seeking  approval from
its  signatories  to modify its  charter to include  land mobile  services.  See
"Business -- Regulation."

In addition to international services,  Inmarsat's facilities are currently used
to provide  maritime  voice and data services  along the North  American  coast,
which is within the Service Area. Currently,  there is uncertainty as to whether
such  facilities also may be used to provide  communications  services on inland
waterways.  The FCC has  authorized  the use of Inmarsat  facilities  to provide
services to aircraft in international flight within U.S. territory. With respect
to domestic land mobile service,  federal  government  policy requires all but a
few  government  users with unique  international  needs to transition  from the
Inmarsat  system to the SKYCELL  System now that the Company is  providing  land
mobile  service.  Current U.S.  policy does not permit any more extensive use of
Inmarsat  facilities  to provide  service in the United  States  than  described
above.  The FCC is  currently  reexamining  the policy  regarding  provision  of
domestic  satellite  service by  intergovernmental  organizations,  and by other
foreign systems  operators.  A repeal or modification of this prohibition  could
have an adverse effect on the Company's business.

                                       11

<PAGE>




Because Inmarsat's current system operates at a much lower power level than does
the SKYCELL System,  its mobile  terminals must be equipped with antenna systems
that are much  larger and more  expensive  than those  required  for the SKYCELL
System.  The  Inmarsat  system  also has per minute  charges  higher  than those
charged  by  the  Company.   Currently,   prices  for   Inmarsat   services  are
approximately  $3.00- $8.00 per minute,  and maritime antennas are typically two
or more feet in diameter.

The  latest  generation of  Inmarsat  satellites,  designated  Inmarsat 3,  were
launched in 1996 but are  estimated  to have only 15%  of  the  total  power  of
AMSC-1.  The Inmarsat 3 satellites  will use a  portion  of  the  same  spectrum
that AMSC-1 is designed to use. Inmarsat  has  introduced  a  terminal  designed
to operate on these newer satellites.  Inmarsat  estimates  that  this  terminal
will sell for $3,000  to  $5,000,  and  that  charges  for using  this  terminal
will  be  approximately  $2.40-$5.50  per  minute. COMSAT, the U.S. signatory to
Inmarsat,  sells a  $3,000  briefcase  terminal  with  a  $4  per  minute  usage
charge  and  has  filed  applications  with  the  FCC  for  both  temporary  and
permanent  authority  to  offer service  on  such  terminals.  This terminal can
be used only with the Inmarsat-3 satellites referred to above.

Although  there can be no assurances, the Company believes that its products and
services  will be  available  at lower  prices  than those  offered by Inmarsat.

Intelsat and  PanAmSat,  L.P.  also  offer  voice,  data  and  fax  services  to
vessels in international waters.

Other than the  Company's  mobile  data service, the  principal satellite-based
communications  system available to the trucking market targeted by the Company
is Qualcomm Incorporated's ("Qualcomm") OmniTracs,  a  nationwide  data service.
Qualcomm currently provides  low-speed  and limited  mobile data services, using
Ku-band satellites,  primarily  to  the  trucking  market  but also  to  other 
transportation companies and  government agencies.  Presently, Qualcomm  is not 
licensed to provide voice services and is not regulated by the FCC as a common
carrier. Qualcomm terminals currently are priced at approximately $3,000 to 
$4,500. Qualcomm's use of high-frequency Ku-band spectrum for its mobile links 
makes communications on its system  more susceptible  to  interruption  during 
periods of heavy precipitation or due to heavy foliage  than  a higher  speed 
system using L-band spectrum.

Qualcomm's  messaging  and location  service  currently  is  used  primarily  by
the  trucking  industry  and competes  directly  with the Company's  mobile data
service. See "Business -- Mobile Data Communications  Services." Qualcomm has an
established  subscriber  base and,  as a  result,  it is  unlikely  that many of
Qualcomm's  subscribers will switch to the Company's data service because of the
considerable investment that such subscribers have made in Qualcomm's equipment.
The Company does anticipate, however, marketing its voice services to Qualcomm's
subscribers,  either  as  an  added  feature  to  Qualcomm's  service  or  on  a
stand-alone basis.

Two other entities, Newcomb Communications, Inc. and Mobile Datacom Corporation,
are  authorized  to  operate  mobile  terminals  for the  provision  of data and
position   location   services  using  leased  L-band  space  segment  on  a  GE
transponder.  Another  company,  NORCOM  Inc.,  has plans to offer  packet  data
services  to the  transportation  industry.  NORCOM is a VASP that will be using
AMSC-1  capacity,  so any competitive  inroads made against the Company's mobile
data service will be partly offset by revenue from NORCOM.

Low Earth and Intermediate  Orbit  Satellites.  There are several  proposals for
complex  Low Earth  Orbit  ("LEO")  and other  non-geostationary  global  mobile
satellite   systems,    including   Motorola,    Inc.'s   Iridium   system   and
Loral/Qualcomm's   Globalstar   system.  An  Inmarsat   affiliate,   ICO  Global
Communications  ("ICO"),  is  developing a global mobile  telephone  system that
would deploy twelve satellites in Medium Earth Orbit ("MEO"). The ICO satellites
are to be  built  by  Hughes  Space  and  Communications  International.  Hughes
Electronics Corporation,  the parent of the Company's largest stockholder,  is a
strategic  investor  in ICO and has the right to purchase a  non-exclusive  U.S.
national service wholesalership for the service.


                                       12

<PAGE>



LEO and MEO  satellites  circle the planet  several times per day at orbits from
several  hundred to ten thousand miles above the earth.  These systems are being
designed to provide  communications via hand-held  telephones similar in size to
today's  hand-held  cellular  telephones.  If built,  these  systems  will offer
certain  advantages  over  the  SKYCELL  System  in  the  consumer  marketplace,
including  the ability to support  small  hand-held  telephones  and, in certain
instances,  these  systems  will have less  transmission  delay than the minimum
quarter-second  delay  characteristic of communications  through  geosynchronous
satellites.  However,  these  systems are  projected  to be  substantially  more
expensive to build and operate than geosynchronous satellite systems such as the
SKYCELL System. Motorola, for example, has announced an estimated initial system
cost of $3.4 billion for its Iridium system,  which, it has stated,  will not be
in service before 1998. In addition, the LEO systems are not expected to provide
the nationwide  dispatch business fleet  capabilities which are supported by the
SKYCELL  System or to support  data  service at any rate in excess of 2,400 bps.
Moreover,  the SKYCELL service is focused primarily on the  business-to-business
market  segment,  and not primarily on the consumer market which is the focus of
the handheld LEO system.  There can be no assurance,  however,  that LEO systems
when deployed, will not have an adverse effect on the Company's business.

In January 1995, the FCC granted licenses to three of the six entities that have
applied  for  licenses to operate LEO  systems,  and the other three  applicants
(including  AMSC) were given until January 1996 to demonstrate  their  financial
qualifications.  The FCC extended this deadline to September  1996. In September
1996,   MCHI  and   Constellation   submitted   showings   of  their   financial
qualifications,  which have been  opposed.  The  Company did not attempt to make
such a showing.  The  Company's  application  was  subsequently  dismissed.  The
applications  of  MCHI  and  Constellation  remain  pending.  See  "Business  --
Regulation -- The Company's License."

In addition to relatively  complex LEO systems  designed to provide mobile voice
services,  there are a number of  proposals  for  relatively  simple LEO systems
providing only  low-speed  packet data  services.  One such system,  operated by
Orbital  Communications,  received a license  from the FCC in  October  1994 and
currently provides service utilizing two satellites.  When complete, the Orbcomm
system will compete for certain segments of the trucking  industry.  Hence, once
its full complement of satellites is operational, there can be no assurance that
Orbcomm  will not have an adverse  impact of the  Company's  business.  Two more
systems were licensed to Starsys  Global  Positioning,  Inc.,  and Volunteers in
Technical Assistance, respectively, in 1995.

Terrestrial  Air-to-Ground  Technologies.  The Company believes that the primary
competitors to its corporate and general aviation  communications  services will
be existing air-to-ground analog radio telephone service providers.  In addition
to such providers,  the FCC has granted licenses to companies to provide digital
air-to-ground  public access pay telephone services principally to passengers on
commercial  airlines;  certain of these licensees  provide or have contracted to
provide service to a number of major domestic and  international  airlines.  One
such  licensee  is  Claircom  Communications,  which is  majority-owned  by AT&T
Wireless  Services,  Inc.,  a major  stockholder  of the  Company,  and provides
digital  air-to-ground  communications  services to both the  commercial and the
private  aviation  markets through its AirOne  Communications  Network.  Several
other digital air-to-ground licensees have also expressed an interest in serving
the corporate and general aviation market.

Terrestrial  Land-Mobile  Technologies.  Although the Company  views the SKYCELL
System as  complementary  to cellular  communications  services rather than as a
direct competitor to such services, the Company currently expects the market for
its services to vary  inversely with  expansions of cellular  service into rural
areas  currently  unserved  by  cellular.  The  Company  expects  the  number of
potential  subscribers  in  unserved  areas to  decline  as rural  service  area
networks are built out,  although the extent of the buildout  will depend upon a
number of factors.  Various  forms of mobile radio service also may be available
in areas not served by cellular.

In the future,  the Company may face  competition  from personal  communications
services ("PCS") systems, a recently introduced and developing technology, which
have been defined by the FCC as radio  communications  that encompass mobile and
ancillary fixed communications services that provide services to individuals and
businesses  and can be integrated  with a variety of competing  networks.  Three
blocks of PCS  spectrum,  totaling 90 MHz,  have been  licensed  nationwide.  Of
these,  a number of systems  have begun  operations,  and many of the  remaining
systems are expected to become operational in the coming year. Three more blocks
of PCS spectrum  totaling 30 MHz have been  auctioned  recently and licensing of
those blocks currently is underway.  Expansion in terrestrial  areas is expected
to be limited by the need for a substantial investment in infrastructure.


                                       13

<PAGE>




Specialized  Mobile Radio ("SMR") is a form of radio  service  authorized by the
FCC. Within the limitations of available spectrum and technology,  SMR operators
provide  mobile  communications  services  to  business  and  individual  users,
including  mobile  telephone,  dispatch,  paging  and data  services.  SMR radio
services have been expanding rapidly over the past ten years and converting from
analog  to  digital  technology.  Like  the  Company,  their  main  markets  are
businesses,  public safety agencies, and transportation  companies.  Examples of
SMR-based systems are discussed below. For certain applications,  such as mobile
telephone  interconnect,  dispatch data transmission and telemetry services, SMR
systems presently are less expensive than the Company's  services,  although the
shared   channel   configuration   and  the  economics  of  these  systems  have
traditionally  caused  SMR  systems  to be less  frequently  utilized  for voice
telephone services. In addition,  the SMR service does not automatically provide
nationwide dispatch capability offered by the SKYCELL system.

Digital  SMR  services  have  recently  been  authorized  under a waiver  of the
existing SMR rules by the FCC. NEXTEL  Communications,  Inc., which provides SMR
services in numerous large  metropolitan  service areas in the United States and
has recently  acquired  several other competing SMR providers,  is among several
leading  providers of SMR  constructing  SMR networks using digital  technology,
frequency  reuse and lower  power  transmitters  to  transform  its  current SMR
service into cellular-like services, including voice telephone services.

The ARDIS system is a mobile data service that is a commercial by-product of the
development by International Business Machines Corporation and Motorola of their
hand-held data terminals and radio modems. This system is a two-way data network
which has served  principally  urban field  maintenance  personnel with portable
wireless data terminals.  The network consists of a combination of company-owned
and leased capacity on existing SMR systems.

Geotek Communications, Inc. offers voice and data communication networks for the
trunked  mobile  radio  market.  Targeted  primarily  to small and  medium-sized
businesses managing fleets of vehicles and mobile workforces,  Geotek is focused
on providing  metropolitan  area voice and data coverage to a radius of about 50
miles.  Currently,  Geotek's  service is  available  in 11 markets with plans to
expand to 26 markets by the end of 1997.

HighwayMaster  Corp.  offers  voice  and data  communications  to the  long-haul
trucking  industry.  While offering  nationwide service in the United States and
Canada,  HighwayMaster's  service is provided through existing cellular systems,
and  therefore  cannot  reach  the  geographic  area  of  the  continental  U.S.
(excluding Alaska) not served by cellular systems.

RAM Mobile Data, a joint venture of RAM Broadcasting and BellSouth  Enterprises,
is a mobile data service targeted  primarily at businesses with field service or
distribution  and maintenance  organizations.  The network supports two-way data
communications,  using  hand-held  and mobile data  terminals and is expected to
serve  primarily high density urban markets,  which are not the primary focus of
the Company's marketing efforts.

NORCOM  Inc.,  has plans to offer  packet data  services  to the  transportation
industry.  NORCOM  has  purchased  AMSC-1  capacity  and  is in the  process  of
commissioning a packet data system developed by Westinghouse. NORCOM's system is
expected to become fully operational  during 1997.  Although NORCOM's service is
targeted on the transportation  industry,  any competitive  inroads made against
the  Company's  mobile  data  service  will be partly  offset by  revenue  under
NORCOM's VASP agreement.

Regulation
- ----------

The ownership  and  operation of the SKYCELL  System is subject to the rules and
regulations of the FCC, which acts under authority granted by the Communications
Act of 1934, as amended (the  "Communications  Act"),  and related federal laws.
Among other things,  the FCC allocates  portions of the radio frequency spectrum
to certain  services and grants  licenses to and regulates  individual  entities
using  that  spectrum.  The FCC  also  licenses  and  regulates  the  interstate
operations  of  communications  common  carriers.  The following is only a brief
summary of certain relevant  provisions of the Federal  communications  laws and
the regulations of the FCC.


                                       14

<PAGE>



Because the Company is a nondominant  common carrier and Commercial Mobile Radio
Service  provider,  its rates are not  subject  to  traditional  public  utility
rate-of-return regulation. The Company must offer service on a first come, first
serve,  reasonably  nondiscriminatory  basis, at just and reasonable  rates. The
Company is not required to file tariffs with the FCC for its domestic  services,
but tariffs are required for international services. The tariffs are presumed to
be lawful, and under current FCC rules, a tariff becomes effective automatically
one day after  filing.  The  Company is required  to lease  channel  capacity to
resellers.  The FCC, however,  may limit the Company's ability to make long-term
capacity  commitments in order to assure that  sufficient  capacity is available
for short-term use by other parties.

The FCC has preempted  state  regulation  of the  Company's  rates for satellite
capacity and acted  broadly to preempt  state  regulation of many aspects of the
provision of commercial mobile radio services.  The FCC, however,  has left open
the  possibility  of states  regulating  certain  limited  aspects of intrastate
mobile services.

The FCC has  pending a  proposal  that would  require  Commercial  Mobile  Radio
Service  providers,  possibly  including  the Company,  to provide equal access,
i.e.,  to  offer  subscribers  a choice  of long  distance  carriers.  If such a
requirement is imposed on the Company,  it might have to reconfigure the CGS and
raise its rate structure,  resulting in higher prices for service and subscriber
confusion.

In July 1996 the FCC required all Commercial  Mobile Radio Service  providers to
offer what are known as  "enhanced  9-1-1  services"  including  the  ability to
automatically  locate the position of all  transmitting  mobile  terminals.  The
Company would not have been able to offer this  automatic  location  information
without  adding   substantially   to  the  cost  of  its  mobile  equipment  and
reconfiguring  its CGS software.  The Company  opposed the  imposition of such a
requirement on its service.  The Commission  decided not to impose  specific new
requirements on mobile satellite  service ("MSS") providers at the present time,
but stated its expectation  that such providers  eventually would be required to
provide "appropriate access to emergency services."

The Communications  Act now requires that providers of interstate  interexchange
telecommunications  services  charge  the same rates in every  state,  including
Puerto Rico and the U.S. Virgin Islands.  The Company has opposed the imposition
of this  requirement on its MSS system,  seeking to preserve the  flexibility to
charge more for service in areas  covered by  satellite  beams that require more
satellite  power.  Although the Company does not currently  charge more for this
service,  more satellite power is required for  communicating to and from mobile
terminals  in  Alaska,  Hawaii,  Puerto  Rico,  and  the  U.S.  Virgin  Islands.
Accordingly, the Company has asked the FCC for permanent exemption from its rate
integration requirement, or at least a temporary waiver of a year or more, which
would give the Company until at least September 15, 1997 to comply.  The FCC has
granted  the  Company an interim  waiver  until its  decision  on the  Company's
temporary waiver request.

The  Company's  License.  The  Company is  licensed by the FCC to provide a full
range of mobile voice, data and dispatch services via satellite to land, air and
sea-based  subscribers  in the Service Area.  The Company is also  authorized to
provide fixed site voice and data services via satellite to locations within the
Service Area, so long as such services remain incidental to the Company's mobile
communications  services.  The Company's license authorizes it to build,  launch
and operate  three  geosynchronous  satellites  in  accordance  with a specified
schedule.  The Company is not in compliance  with the schedule for  commencement
and  construction of its second and third  satellites and has petitioned the FCC
for  changes to the  schedule.  Certain of these  extension  requests  have been
opposed by third parties.  The FCC has not acted on the Company's requests.  The
FCC has the  authority  to revoke  the  authorizations  for the second and third
satellites  and,  in  connection  with such a  revocation,  could  exercise  its
authority  to rescind  the  Company's  license.  The Company  believes  that the
exercise of such  authority to rescind the license is unlikely.  The term of the
license for each of the  Company's  three  authorized  satellites  is ten years,
beginning when the Company certifies that the respective  satellite is operating
in  compliance  with the  Company's  license.  The ten-year term of AMSC-1 began
August 21, 1995.  Although the Company  anticipates that the authorizations will
be extended in due course to  correspond  to the useful lives of the  satellites
and that new licenses will be granted for  replacement  satellites,  there is no
assurance of such extension or grant.

                                       15

<PAGE>



The FCC has  designated  the Company as the licensee  for both Mobile  Satellite
Service and Aeronautical Mobile Satellite (Route) Service  ("AMS(R)S").  AMS(R)S
includes  satellite  communications  related to air traffic control,  as well as
aeronautical  safety-related  operational  and  administrative  functions.  As a
condition to its authorization, the Company is required by the FCC to be capable
of  providing  priority  and  preemptive  access for  AMS(R)S  traffic and to be
interoperable with and capable of transferring  AMS(R)S traffic to international
and foreign systems providing such service. The Company currently anticipates it
will be able to meet these  requirements  without any material adverse effect on
its business.  If the Company is unable to meet these requirements,  the FCC may
authorize and give priority spectrum access to one or more additional  satellite
systems  that  meet the  specified  requirements.  If the  Company  is  assigned
spectrum in the lower L-band,  it will be required by the FCC to provide similar
priority and preemptive  access in that spectrum to maritime distress and safety
communications.  The Company currently  anticipates it will be able to meet this
requirement without any material adverse effect on its business.

The Federal  Aviation  Administration  ("FAA") filed comments in connection with
the Company's  application to operate 200,000 mobile telephones to provide voice
service,  stating its concern that the mobile  telephones may interfere with the
expected operation of aeronautical  navigation and communications  systems. With
the FAA's consent, the FCC granted the Company's  application subject to certain
conditions,  including  that the grant may be  modified  after the  interference
issue is studied.  The FAA also filed comments in connection  with the Company's
application to operate up to 30,000 mobile data terminals that were transitioned
from leased space  segment to AMSC-1 in late 1995,  stating its concern that the
mobile  data  terminals  cannot be  operated in  compliance  with the  Company's
obligation to provide  priority and  preemptive  access for AMS(R)S in the upper
L-band.  The FAA has proposed that the Company operate the mobile data terminals
in the lower L-band. The FCC granted the Company temporary  authority to operate
up to  15,100  mobile  data  terminals  in the lower  L-band.  This  number  was
increased to 33,100 terminals  pursuant to AMSC's acquisition of the mobile data
equipment  and  services  previously  licensed  to  Rockwell.  There  can  be no
assurance  that the Company will continue to receive  authority to operate these
terminals  in the lower  L-band or that the Company  will  receive  authority to
operate additional mobile data terminals in the lower L- band.

FCC licensees are subject to other  restrictions  imposed by the  Communications
Act,  including  prohibitions on the assignment of a license and on the transfer
of control of a licensee  without the prior consent of the FCC. The Company will
continue  to  require  additional  authorizations  from the FCC to  operate  the
SKYCELL System.

Full implementation of the Satellite Capacity  Agreement,  with respect to those
provisions which have not yet been exercised,  requires the approval of the FCC,
may require the approval of the Canadian  CRTC and will be submitted to Industry
Canada for review.

GTE  Non-Interference  Agreement.  The Company's  license  authorizes  AMSC-1 to
operate using TT&C frequencies in the 12000/14000 MHz band. In 1992, the Company
and GTE  Spacenet  Corporation  ("GTE  Spacenet"),  the  owner  of a  satellite,
SPACENET IV, which  operates at  101(degree)  west  longitude,  the same orbital
location as AMSC-1 but not in the frequencies proposed to be used by the Company
for TT&C,  entered into an agreement (the "GTE Spacenet  Agreement") in order to
avoid an  unacceptable  level of  interference  among  AMSC-1 and SPACENET IV or
certain other existing or future GTE Spacenet  satellites (such other satellites
each being a "GTE Replacement Satellite"). The GTE Spacenet Agreement is binding
on all  acquirors  of or  successors  to GTE  Spacenet's  rights with respect to
SPACENET IV.

In the GTE Spacenet  Agreement,  GTE  Spacenet and the Company each  acknowledge
that  for so long as they  operate  SPACENET  IV and  AMSC-1,  respectively,  in
accordance  with  the  technical  parameters  set  forth  in  the  GTE  Spacenet
Agreement,  co-location  of AMSC-1 and SPACENET IV and the operation of SPACENET
IV and AMSC-1 as currently proposed will result in interference not exceeding an
acceptable  level  of  interference  to  transmissions  to and from  AMSC-1  and
SPACENET IV (the "Acceptable  Level").  If interference  materially  exceeds the
Acceptable  Level,  it could  adversely  impact the  reliability of any affected
transponder on SPACENET IV and the Company's TT&C operations, in which event GTE
Spacenet and the Company would have certain rights and obligations  described in
the next paragraph.

The GTE Spacenet Agreement provides that if, despite GTE Spacenet's efforts, the
level of interference between AMSC-1 and a GTE Replacement  Satellite materially
exceeds the Acceptable Level, the Company has certain rights to lease or buy the
communications  capacity  affected by such  interference  on the GTE Replacement
Satellite or that cause such  interference to AMSC-1, or to require GTE Spacenet
to structure transponder service and to reallocate  transponder usage on a basis
that avoids interference materially above the Acceptable Level. The Company also
has certain  rights to request GTE Spacenet to construct  future  satellites  in
such a way that will not cause interference above the Acceptable Level, in which
event the Company would be required to pay GTE Spacenet the resulting additional
costs.  The procedures  adopted in the GTE Spacenet  Agreement will reduce,  but
will not eliminate, the risk that interference will exceed the Acceptable Level.


                                       16

<PAGE>




If the foregoing  procedures are not sufficient to avoid interference  exceeding
the Acceptable Level between AMSC-1 and a GTE Replacement Satellite, the Company
at its  discretion  would be  required  either to cease to  operate  AMSC-1 in a
manner that  causes  interference  to the GTE  Replacement  Satellite  above the
Acceptable Level (which could have an adverse effect on the Company's  business)
or, to the extent feasible and at its own expense, to relocate AMSC-1 to another
orbital location.

Alien Ownership.  The  Communications Act provides that certain FCC licenses may
not be held by a  corporation  of which  more than 20% of its  capital  stock is
directly  owned of record or voted by  non-U.S.  citizens  or  entities or their
representatives (AMSC Subsidiary,  as the holder of the FCC license to construct
and operate the Company's mobile satellite  services system, is subject to these
restrictions).  Further, the Communications Act provides that no FCC license may
be held by a corporation  controlled by another  corporation if more than 25% of
the controlling  corporation's capital stock is owned of record or voted by non-
U.S. citizens or entities or their representatives  ("Alien Ownership"),  if the
FCC finds that the public  interest  is served by the refusal or  revocation  of
such license (AMSC  controls AMSC  Subsidiary  and therefore is subject to these
restrictions).  The  Communications  Act and related FCC policies  place similar
restrictions on Alien Ownership of other direct or indirect equity  interests in
a licensee  or its  parent,  as well as on  nonequity  investments  by  non-U.S.
citizens or entities or their  representatives  if such investments are combined
with  material  involvement  by the  investor in the business of the licensee or
parent.  As of January 1, 1997,  AMSC's  Alien  Ownership  was  estimated  to be
approximately  21%. Among the steps that the Company might take in the future to
effect compliance with the FCC's Alien Ownership  restrictions are:  restricting
the purchase of shares by foreign investors; precluding the exercise of warrants
held by foreign investors;  and, if possible,  redeeming shares owned by foreign
stockholders  from time to time. The  stockholders'  agreement to which AMSC and
certain of its stockholders are party also contains  procedures for reducing the
risk  that the  Company  will  fail to comply  with the  FCC's  Alien  Ownership
restrictions  as a result of the  ownership  of the  stockholders  party to that
Agreement or their respective  holdings in AMSC. Each stockholder  party to that
agreement who,  together with its affiliates,  owns in excess of five percent of
the Common Stock ("Specified  Stockholder") is required to certify annually (and
in the event of changes) as to that party's level of Alien Ownership. If counsel
for AMSC is unable to confirm AMSC's  continued  compliance with the FCC's Alien
Ownership  requirements,   each  Specified  Stockholder  whose  Alien  Ownership
attributable to AMSC has increased since the last certification as the result of
certain  defined  actions  must, in general,  take steps  promptly to reduce the
Alien Ownership  attributed to it or be subject to an option exercisable by AMSC
to purchase such portion of that stockholder's  shares in AMSC for $1 per share,
as is necessary to effect  compliance.  There can be no assurance  that these or
the other steps  described  above will be effective to insure AMSC's  compliance
with the FCC's Alien Ownership requirements.

Spectrum Availability and International  Frequency  Coordination.  The Company's
Subscriber  Equipment will operate in L-band  frequencies,  which are limited in
available   bandwidth.   The   feeder-link   earth   stations  and  the  network
communications  controller  of the  CGS  operate  in the  more  plentiful  fixed
satellite service Ku-band  frequencies.  AMSC-1 is designed to cross-connect the
L-band links from the  Subscriber  Equipment  with their  corresponding  Ku-band
links  to  the  feeder-link  earth  stations  and  the  network   communications
controller.  Using Ku-band for the feeder links  optimizes the use of the scarce
L-band spectrum.  The use of the Ku-band,  however,  requires  coordination with
terrestrial  users,  which could  restrict the  placement of  feeder-link  earth
stations.  In the L-band  frequencies,  the  Company is  currently  licensed  to
operate in the  1544-1559/1645.5-1660.5 MHz bands. AMSC-1 is designed to be able
to operate over the  1530-1559/1631.5-1660.5  MHz bands. The Company has applied
for  authorization  to operate over the additional  1530-1544/1631.5-1645.5  MHz
bands.  Of the 30 MHz  assigned to the Company by the FCC, one MHz is limited to
AMS(R)S  and  one-way  paging  and two MHz are  limited to  distress  and safety
communications.  The  Company  does not plan to  operate  on these  three MHz of
bandwidth.


                                       17

<PAGE>



The Company has filed an  application  with the FCC to operate  AMSC-1  using an
additional 28 MHz of L-band  frequencies  adjacent to those already  assigned to
the  Company by the FCC (the  "lower  L-band").  In June 1996,  the FCC issued a
notice of proposed  rulemaking  proposing  to assign to the Company the first 28
MHz of  internationally  coordinated  L-band  spectrum  from either the upper or
lower portion of the MSS L- band. The Company would have first  priority  access
to use the lower  L-band  spectrum  as  necessary  to  compensate  for  spectrum
unavailable for coordination in the upper L-band.  In the event the U.S. is able
to coordinate  more than 28 MHz of L-band  spectrum,  the FCC proposes  allowing
other applicants to apply for assignment of those frequencies.  Certain entities
have filed with the FCC petitions to deny the Company's application and comments
opposing the  assignment  of  additional  frequencies  to the  Company,  but the
Company  believes  that there are several  reasons why the agency will grant the
Company's  application.  There is a  possibility  that the FCC will  auction the
additional  frequencies  to the  highest  bidder.  Congress  has  given  the FCC
authority  to  auction   spectrum   for  which  there  are  mutually   exclusive
applications, but it is the Company's position that these additional frequencies
should not be auctioned  because only the Company is able to use the frequencies
efficiently. No competing applications have been filed to use the lower L-band.

In the Ku-band frequencies,  the Company is currently licensed to operate AMSC-1
using 200 MHz within the bands  10.75-10.95 GHz for downlink  transmissions  and
13.0-13.15  GHz and  13.2-13.25  GHz for uplink  transmissions.  The Company has
applied for authority to operate using an additional 200 MHz of spectrum  within
the same bands.

The SKYCELL System is restricted by the amount of L-band  spectrum  available to
it.  Spectrum  availability  is a  function  not  only of how much  spectrum  is
assigned  to the  Company  by the FCC,  but also the  extent  to which  the same
frequencies  are used by other  systems in the North  American  region,  and the
manner of such use.  All  spectrum use must be  coordinated  with other  parties
which are providing or plan to provide mobile satellite-based  communications in
the same  geographical  region using the same spectrum.  At this time, the other
parties with which spectrum use must be coordinated include Canada,  Mexico, the
Russian Federation and Inmarsat.

Use of the spectrum is determined  through a series of negotiations  between the
United States government and the other user agencies,  pursuant to the rules and
regulations  of the ITU.  The ITU is a  specialized  agency  within  the  United
Nations   organization   responsible   for  the   international   regulation  of
telecommunications.  For the  past  several  years,  each of the  countries  and
international  organizations that have or will use L-band frequencies within the
North  American  region have been meeting  regularly to negotiate and coordinate
their current and future use of that  spectrum.  Representatives  of the Company
have  participated  in  certain  of these  negotiations  in  support of the U.S.
delegation.

The Company estimates that international coordination will make approximately 20
MHz of L-band  spectrum  available  to the United  States for AMSC-1.  Since the
coordination  process  involves many parties and there is uncertainty  about the
total outcome,  the actual amount of spectrum available may be more or less than
that  estimated.  Some of the spectrum  that may be available to the Company may
include  a  portion  of  the  28  MHz  lower  L-band  spectrum  adjacent  to the
frequencies  already assigned to the Company by the FCC. In anticipation of that
possibility,  the  Company  filed the  application  described  above  requesting
specific authority from the FCC to operate using these additional frequencies.

The ITU's  Radio  Regulations  include  a table of  frequency  allocations  that
prescribe the permitted uses of the radio spectrum. A significant portion of the
spectrum assigned to the Company by the FCC is allocated  internationally solely
to aviation safety  communications  on a primary basis. The U.S.  government has
taken  the  position  internationally  that the U.S.  mobile  satellite  service
system, while it will provide other  communications  services as well, qualifies
as  an  aviation   safety  system  and,  as  a  result,   all  of  the  system's
communications  are entitled to use all of the spectrum that may be  coordinated
for the system. While the Company is aware that some international organizations
may  disagree  with the U.S.  position,  the  U.S.  interpretation  has not been
formally  challenged at the ITU.  There can be no  assurances,  however,  that a
challenge  will not occur in the future.  As a result of the ITU satellite  plan
for 10700-10950 MHz,  11200-11450 MHz and 12750-13250 MHz, the United States has
not coordinated  international  use of the 10700-10950 MHz,  11200-11450 MHz and
12750-13250  MHz band for earth station feeder links in Alaska,  Hawaii,  Puerto
Rico, and the Virgin Islands.  Accordingly,  feeder-link  earth stations may not
operate in these locations. The Company does not currently anticipate a need for
earth stations in these areas,  and if such a need developed,  the Company would
not be able to operate  feeder-link  earth  stations  without ITU  coordination.
There can be no assurance that the ITU would accept any such request.


                                       18

<PAGE>




Possible Additional Satellite Projects
- --------------------------------------

In December 1992,  AMSC formed a new  wholly-owned  subsidiary,  American Mobile
Radio Corporation ("AMRC"),  for the purpose of pursuing an FCC authorization to
construct, launch and operate a domestic communications satellite system for the
provision of digital audio radio service  ("DARS").  AMRC's  application for the
authorization  contemplates  that AMRC will  construct,  launch and  operate two
domestic  communications  satellites and that the system will be used largely to
provide subscription audio services.  The application provides that the DARS and
the SKYCELL System will largely use separate facilities. There are several other
applications to provide DARS that may be mutually  exclusive with those of AMRC.
On March 3, 1997,  the FCC issued a Report and Order for auction of two licenses
for the  provision of DARS.  The Order  provides  for an auction  among the four
original  applicants,  including AMRC, and provides for a deposit of $3 million,
together with a minimum bid of $8 million for each  license.  On March 14, 1997,
the Company entered into an agreement with WorldSpace,  Inc. with respect to the
funding of AMRC,  pursuant  to which the  investor  has  obtained an initial 20%
interest in AMRC. The auction is scheduled to begin April 1.

In April 1994, a subsidiary of the Company,  Personal  Communications  Satellite
Corporation,  filed an  application  to construct an MSS system in the 1970-1990
MHz and 2160-2180 MHz bands.  The FCC  subsequently  allocated the 1970-1990 MHz
band  to  terrestrial  personal  communications  services  and has  initiated  a
proceeding  to allocate the  1990-2025 MHz and 2165-2200 MHz bands to the Mobile
Satellite  Service.  Additional  spectrum  in  the  2  GHz  band  was  allocated
internationally to MSS at the 1995 World Radiocommunication Conference, but none
of this spectrum has been allocated domestically to MSS.

Employees
- ---------

At February 1, 1997, the Company had  approximately  297 employees.  None of the
Company's  employees is represented by a labor union. The Company  considers its
relations with its employees to be good.

Item 2.  Properties.
- --------------------

AMSC-1 is owned by the Company,  and has been pledged as security for all of the
Company's  outstanding  debt  financing,  other than  amounts  owed to  Northern
Telecom Finance Corporation.

The Company leases its headquarters  office space and network  operations center
at 10802 and 10800  Parkridge  Boulevard,  Reston,  Virginia  20191 (the "Reston
Site").  The lease has a term of at least ten years  which  runs from  August 4,
1993, through August 3, 2003 (which may be extended at the Company's election to
a total of 15  years).  The annual  base rent is  approximately  $1.33  million,
adjusted  annually as provided in the lease. The Company is utilizing the Reston
Site as both its corporate headquarters and as the network operations center for
the CGS,  including the Company's  primary  feeder-link  to AMSC-1.  The Company
believes  that the Reston Site is  well-suited  for its present and  anticipated
needs.

In  March  1994,  the  Company   entered  into  an  agreement  with   Washington
International  Teleport  ("WIT") to lease a satellite  earth station  located in
Alexandria,  Virginia to serve as the Company's  diversity  site for its Reston,
Virginia  site.  The agreement  contemplates a 10-year lease at a monthly fee of
$47,000,  with advance payments  aggregating $350,000 paid in three installments
upon  execution of the  agreement  and on January 1 and February 1, 1995,  and a
service  start date of no earlier than March 1, 1995.  At the end of the initial
term,  the lease will  automatically  be extended for an additional  five years,
with a monthly fee of  $30,000,  unless  either WIT or the Company  elect not to
renew the agreement.

In November  1996,  the Company  entered into a short term lease with  Rockwell,
terminating on June 30, 1998, for purposes of  transitioning  to the Company the
multi-mode  data  operations  acquired from Rockwell.  The monthly lease rate is
approximately  $17,000.  The  Lease is  terminable  by the  Company  on 30 days'
notice.



                                       19

<PAGE>



Item 3.  Legal Proceedings.
- ---------------------------

In 1992,  a former  director  of AMSC filed an  Amended  Complaint  against  the
Company alleging  violations of the Communications Act of 1934, as amended,  and
of the Sherman Act and breach of contract.  The suit seeks  damages for not less
than $100  million  trebled  under the  antitrust  laws plus  punitive  damages,
interest, attorneys' fees and costs. In mid-1992, the Company filed its response
denying all  allegations.  The Company's motion for summary  judgment,  filed on
March 31, 1994,  was denied on April 18, 1996.  The matter,  originally  set for
trial in  November  1996,  has been  rescheduled  for  trial in  December  1997.
Management  believes  that the  complaint  is without  merit,  and the  ultimate
outcome of this matter will not be material to the Company's financial position,
results of operations or its cash flows.

Item 4.  Submission of Matters to a Vote of Security Holders.
- -------------------------------------------------------------

No matters were  submitted to a vote of the  Company's  Stockholders  during the
fourth quarter of fiscal 1996.



                                       20

<PAGE>




                                     PART II

Items 5, 6, 7 and 8.
- --------------------

The  information  called for by Items 5 through 8 of Part II is  presented  in a
separate  section  of this  Annual  Report on Form 10-K  commencing  on the page
numbers specified below:

            Form 10-K Item                          Page
            --------------                          ----

   Item 5 - Market for the Registrant's
   Common Equity and Related Matters                F-30

   Item 6 - Selected Financial Data                 F-31

   Item 7- Management's Discussion and
   Analysis of Financial Condition and
   Results of Operations                            F-1
 
   Item 8 - Financial Statements and
   Supplementary Data                               F-8


Item 9.  Changes in and Disagreements with Accountants on Accounting and 
- ------------------------------------------------------------------------ 
         Financial Disclosure.
         ---------------------

         None.


                                    PART III


Items 10, 11, 12 and 13.
- ------------------------

The information called for by Part III (Items 10, 11, 12 and 13) is incorporated
herein by reference from the material  included  under the captions  "Nominees,"
"Executive Officers," "Executive  Compensation,"  "Security Ownership of Certain
Beneficial   Owners   and   Management,"    "Agreements   Among   Stockholders,"
"Compensation and Stock Option Committee  Interlocks and Insider  Participation"
and "Section 16(a) Beneficial  Ownership Reporting  Compliance" in the Company's
definitive  proxy statement (to be filed) for its Annual Meeting of Stockholders
to be held May 21, 1997 (the "Proxy  Statement").  The Proxy  Statement is being
prepared and will be filed with the Securities and Exchange  Commission pursuant
to  Regulation  14A, and furnished to the  Company's  Stockholders,  on or about
April 21, 1997.

                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules, and Reports on Form 8-K.
- ---------------------------------------------------------------------------

(a)      1.  Financial Statements.

         The following  consolidated financial statements of the Company and its
         subsidiaries  are included in a separate  section of this Annual Report
         on Form 10-K commencing on the page numbers specified below:

         Index to Financial Statements.......................................F-i
         Independent Auditor's Report - Arthur Andersen LLP..................F-8
         Consolidated Statements of Loss for the years ended
            December 31, 1994, 1995 and 1996.................................F-9
         Consolidated Balance Sheets as of December 31, 1996 and 1995.......F-10
         Consolidated Statement of Stockholders' Equity for the period  
            December 31, 1993 through December 31, 1996.....................F-11
         Consolidated Statements of Cash Flow for the years ended 
            December 31, 1994, 1995 and 1996................................F-13
         Notes to Financial Statements......................................F-14


                                       21

<PAGE>




         2.  Financial Statement Schedules.

         Financial  Statement  Schedules  not included with the one listed below
         have been omitted because they are not required or not  applicable,  or
         because the required  information is shown in the financial  statements
         or notes thereto.

             I.     Condensed Financial 
                      Information of Registrant.........................Page S-1

         3.  Exhibits.

         3.1    --  Amended and Restated  Certificate of Incorporation  of  AMSC
                    (as amended  effective  January 31, 1996)  (Incorporated  by
                    reference  to  Exhibit  10.15h  to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the  period  ending  June 30,
                    1996 (File No.  0-23044)) 3.2 -- Amended and Restated Bylaws
                    of AMSC (as  amended and  restated  effective  February  29,
                    1996)(Incorporated  by  reference  to Exhibit  10.15h to the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending June, 1996 (File No. 0- 23044))

         9.1    --  Amended  and  Restated  Stockholders' Agreement dated  as of
                    December 1, 1993,  between  AMSC and certain  holders of its
                    capital stock  (Incorporated  by reference to Exhibit 9.1 to
                    the Company's  Registration  Statement on Form S-1 (Reg. No.
                    33- 70468))

         9.2    --  Voting  Agreement  dated  as of  March  1, 1994,  between 
                    Donaldson, Lufkin & Jenrette Securities Corporation and AMSC
                    (Incorporated  by reference to Exhibit 9.2 to the  Company's
                    Annual  Report on Form 10-K filed for the fiscal year ending
                    December 31, 1993 (File No. 0-23044))

         10.2   --  Sublease Agreement for Facility  at Washington, D.C., dated 
                    as of  June  21,  1990,  supplemented  September  12,  1991,
                    modified  November  4, 1992 and  modified  again  January 7,
                    1993, between AMSC and Fulbright & Jaworski (Incorporated by
                    reference  to  Exhibit  10.2 to the  Company's  Registration
                    Statement on Form S-1 (Reg. No. 33-70468))

         10.3   --  Contract for  an  MSAT  Spacecraft, dated  December 7, 1990 
                    between AMSC and Hughes Aircraft  Company,  amended June 15,
                    1993  (Amendment  Nos.  1  through  4) and  further  amended
                    November 11, 1993 (Amendment No. 5), between AMSC Subsidiary
                    Corporation,  as  assignee  of  AMSC,  and  Hughes  Aircraft
                    Company  (Incorporated  by  reference to Exhibit 10.3 to the
                    Company's  Registration  Statement  on Form  S-1  (Reg.  No.
                    33-70468))

         10.3a  --  Amendment No. 6 to the AMSC Hughes MSAT Spacecraft Contract,
                    dated October 11, 1994, between AMSC Subsidiary Corporation,
                    as   assignee   to  AMSC,   and  Hughes   Aircraft   Company
                    (Incorporated by reference to Exhibit 10.3a to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0-23044))

         10.3b  --  Mutual  Final  Release, dated October 11, 1994, between AMSC
                    Subsidiary  Corporation,  Hughes  Aircraft,  Spar  Aerospace
                    Limited  and  Lockheed   Missiles  &  Space  Company,   Inc.
                    (Incorporated by reference to Exhibit 10.3b to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0-23044))

                                       22

<PAGE>



         10.7   --  Memorandum  of   Agreement for  Satellite  Capacity,  dated
                    February 17, 1992,  between AMSC Subsidiary  Corporation and
                    Telesat Mobile Inc., as amended by Amending  Agreement dated
                    October 18, 1993 among AMSC, AMSC Subsidiary Corporation and
                    TMI  Communications  and Company,  Limited  Partnership,  as
                    successor in interest to Telesat Mobile Inc., and as further
                    amended  by  letter   agreement   dated   October  18,  1993
                    (Incorporated  by reference to Exhibit 10.7 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.8a  --  [Reserved]

         10.11  --  Right of First Offer Agreement dated as of November 30, 1993
                    among AMSC, Hughes Communications  Satellite Services, Inc.,
                    Singapore  Telecommunications Ltd., Satellite Communications
                    Investments  Corporation,  Space  Technologies  Investments,
                    Inc.,  Satellite  Mobile  Telephone  Company  L.P.,  Transit
                    Communications, Inc., MTel Space Technologies, L.P. and MTel
                    Space Technologies Corporation (Incorporated by reference to
                    Exhibit  10.11 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))

         10.13* --  Amended and Restated Stock Option Plan (as amended effective
                    April 25, 1996)  (Incorporated by reference to Exhibit 10.13
                    to the Company's Quarterly Report on Form 10-Q filed for the
                    period ending June 30, 1996 (File No. 0-23044))

         10.13a*--  Form  of  Employee  Stock  Option Agreement (Incorporated by
                    reference to Exhibit  10.13a to the Company's  Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1993
                    (File No. 0-23044))

         10.13b*--  Amended  Form  of  Employee  Stock  Option  Agreement 
                    (Incorporated by reference to Exhibit 10.3b to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0-23044))

         10.15  --  Credit Agreement, dated August 31, 1992 and amended November
                    17,  1992  and  March  23,  1993,   among  AMSC   Subsidiary
                    Corporation,  Bank of  America  National  Trust and  Savings
                    Association,  as Agent, and the Other Financial Institutions
                    Parties  Thereto,  further amended by letter agreement dated
                    October 14, 1993 between AMSC Subsidiary  Corporation,  Bank
                    of America National Trust and Savings Association, as Agent,
                    and  the  banks  from  time to time  parties  to the  Credit
                    Agreement (Incorporated by reference to Exhibit 10.15 to the
                    Company's  Registration  Statement  on Form  S-1  (Reg.  No.
                    33-70468))

         10.15a --  Third  Amendment  to  Credit  Agreement  dated as of July 7,
                    1994,  among AMSC  Subsidiary  Corporation,  Bank of America
                    National Trust and Savings  Association,  as Agent,  and the
                    Other Financial  Institutions Parties Thereto  (Incorporated
                    by reference to Exhibit  10.15a to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the  period  ending  June 30,
                    1994 (File No. 0-23044))

         10.15b --  Fourth  Amendment to Credit  Agreement dated as of March 15,
                    1995,  among AMSC  Subsidiary  Corporation,  Bank of America
                    National Trust and Savings  Association,  as Agent,  and the
                    other Financial Institutions Parties Thereto.  (Incorporated
                    by reference to Exhibit  10.15b to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the period  ending  March 31,
                    1995 (File No. 0-23044)).

         10.15c --  Intercreditor  and  Collateral  Agency Agreement dated as of
                    March 15, 1995,  among the Secured Parties from time to time
                    party thereto and Bank of America National Trust and Savings
                    Association, as Collateral Agent. (Incorporated by reference
                    to Exhibit 10.15c to the Company's Quarterly  Report on Form
                    10-Q filed for the period  ending  March 31,  1995 (File No.
                    0-23044))

                                       23

<PAGE>



                  

         10.15d --  Amended and Restated  Security  Agreement dated as of March
                    15, 1995,  between AMSC  Subsidiary  Corporation and Bank of
                    America National Trust and Saving Association, as Collateral
                    Agent.  (Incorporated  by reference to Exhibit 10.15d to the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending March 31, 1995 (File No. 0-23044))

         10.15e --  Amended and  Restated  Parent  Pledge Agreement  dated as of
                    March 15, 1995,  between  AMSC and Bank of America  National
                    Trust  and  Saving   Association,   as   Collateral   Agent.
                    (Incorporated   by  reference  to  Exhibit   10.15e  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending March 31, 1995 (File No. 0-23044))

         10.15f --  Amended and Restated  Continuing Guaranty dated as of March 
                    15, 1995, made by AMSC in favor of Bank of America  National
                    Trust  and  Saving   Association,   as   Collateral   Agent.
                    (Incorporated   by  reference  to  Exhibit   10.15f  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending March 31, 1995 (File No. 0-23044))

         10.15g --  Fifth  Amendment to Credit  Agreement  dated as of  May 31, 
                    1995,  among AMSC  Subsidiary  Corporation,  Bank of America
                    National Trust and Savings  Association,  as Agent,  and the
                    other Financial Institutions Parties Thereto.  (Incorporated
                    by reference to Exhibit  10.15g to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the  period  ending  June 30,
                    1995 (File No. 0-23044))

         10.15h --  Sixth Amendment to Credit Agreement dated as of September 5,
                    1995,  among AMSC  Subsidiary  Corporation,  Bank of America
                    National Trust and Savings  Association,  as Agent,  and the
                    Other Financial Institutions Parties Thereto.  (Incorporated
                    by reference to Exhibit  10.15h to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the period  ending  September
                    30, 1995 (File No. 0-23044))

         10.15i --  Exhibit A to Sixth Amendment to Credit Agreement dated as of
                    September 5, 1995, among AMSC Subsidiary  Corporation,  Bank
                    of America National Trust and Savings Association, as Agent,
                    and  the  Other  Financial   Institutions  Parties  Thereto.
                    (Incorporated   by  reference  to  Exhibit   10.15i  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending September 30, 1995 (File No. 0-23044))

         10.16  --  Deferred  Payment  Agreement, dated  September 15, 1992  and
                    amended   February   2,  1993,   between   AMSC   Subsidiary
                    Corporation and Westinghouse Electric  Corporation,  further
                    amended by letter  agreement  dated October 18, 1993 between
                    AMSC  Subsidiary   Corporation  and  Westinghouse   Electric
                    Corporation  (Incorporated  by reference to Exhibit 10.16 to
                    the Company's  Registration  Statement on Form S-1 (Reg. No.
                    33-70468))

         10.16a --  Letter  Agreement,  dated  August 30, 1994,  between  AMSC
                    Subsidiary Corporation and Westinghouse Electric Corporation
                    (Incorporated   by  reference  to  Exhibit   10.16a  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending September 30, 1994 (File No. 0-23044))

         10.16b --  Letter  Agreement,  dated  February  28, 1995,  between AMSC
                    Subsidiary    Corporation    and    Westinghouse    Electric
                    Corporation. (Incorporated by reference to Exhibit 10.16b to
                    the  Company's  Quarterly  Report on Form 10-Q filed for the
                    period ending March 31, 1995 (File No. 0-23044))

         10.16c --  Letter Agreement to Deferred Payment  Agreement, dated  July
                    31,  1995,   between   AMSC   Subsidiary   Corporation   and
                    Westinghouse   Electric   Corporation.    (Incorporated   by
                    reference  to  Exhibit  10.16c  to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the period  ending  September
                    30, 1995 (File No. 0-23044))


                                       24

<PAGE>




         10.16d --  Letter  Agreement  to  Deferred  Payment  Agreement,  dated 
                    September 11, 1995, between AMSC Subsidiary  Corporation and
                    Westinghouse   Electric   Corporation.    (Incorporated   by
                    reference  to  Exhibit  10.16d  to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the period  ending  September
                    30, 1995 (File No. 0-23044))

         10.16e --  Letter  Agreement  to  Deferred  Payment  Agreement,  dated 
                    February 13, 1997,  between AMSC Subsidiary  Corporation and
                    Westinghouse Electric Corporation (filed herewith).

         10.16f --  Letter Agreement  to Deferred Payment Agreement, dated March
                    11,  1997,   between   AMSC   Subsidiary   Corporation   and
                    Westinghouse Electric Corporation (filed herewith).

         10.17  --  Mobile Terminal Production Agreement, dated October 6, 1992,
                    between  AMSC  Subsidiary   Corporation   and   Westinghouse
                    Electric Corporation acting through Westinghouse  Electronic
                    Systems Company  (Incorporated by reference to Exhibit 10.17
                    to the  Company's  Registration  Statement on Form S-1 (Reg.
                    No. 33-70468))

         10.17a --  Amendment  No. 1 to  Mobile  Terminal  Production Agreement,
                    dated November 21, 1994, between AMSC Subsidiary Corporation
                    and  Westinghouse   Electric   Corporation   acting  through
                    Westinghouse  Electronic  Systems Company  (Incorporated  by
                    reference to Exhibit  10.17a to the Company's  Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1994
                    (File No. 0-23044))

         10.17b --  Amendment  No. 2 to  Mobile  Terminal  Production Agreement,
                    dated January 23, 1995, between AMSC Subsidiary  Corporation
                    and  Westinghouse   Electric   Corporation   acting  through
                    Westinghouse  Electronic  Systems Company  (Incorporated  by
                    reference to Exhibit  10.17b to the Company's  Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1994
                    (File No. 0-23044))

         10.17c --  Amendment  No. 3 to  Mobile  Terminal  Production Agreement,
                    dated March 21, 1995,  between AMSC  Subsidiary  Corporation
                    and  Westinghouse   Electric   Corporation   acting  through
                    Westinghouse  Electronic  Systems Company  (Incorporated  by
                    reference to Exhibit  10.17c the Company's  Annual Report on
                    Form 10-K for the fiscal year ended  December 31, 1994 (File
                    No. 0-23044))

         10.18  --  Mobile  Terminal  Production  Contract, dated  November  30,
                    1992,  between AMSC  Subsidiary  Corporation  and Mitsubishi
                    Electric  Corporation  (Incorporated by reference to Exhibit
                    10.18 to the  Company's  Registration  Statement on Form S-1
                    (Reg. No. 33-70468))

         10.18a --  Addendum Number One dated June 29, 1994, to  Mobile Terminal
                    Production Contract between AMSC Subsidiary  Corporation and
                    Mitsubishi Electric  Corporation  (Incorporated by reference
                    to Exhibit 10.18a to the Company's  Quarterly Report on Form
                    10-Q  filed  for the  period  ending  June  30,  1994  (File
                    No.0-23044))

         10.18b --  Memorandum of Agreement,  dated November 30, 1994,  between
                    AMSC   Subsidiary   Corporation   and  Mitsubishi   Electric
                    Corporation  (Incorporated by reference to Exhibit 10.18b to
                    the Company's Annual Report on Form 10-K for the fiscal year
                    ended December 31, 1994 (File No. 0-23044))

         10.19  --  Codec License Agreement, dated February 2, 1993 and  amended
                    March 26, 1993,  between  AMSC  Subsidiary  Corporation  and
                    Digital Voice Systems,  Inc.  (Incorporated  by reference to
                    Exhibit  10.19 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))

                                       25

<PAGE>



         10.20  --  Deed  of  Lease at  Reston, Virginia, dated February 4, 1993
                    and  amended   June  21,  1993,   between  AMSC   Subsidiary
                    Corporation  and  Trust  Company  of  the  West  as  Trustee
                    (Incorporated by reference to Exhibit 10.20 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.20a --  Amendment  No. 4  to  Deed of Lease, dated  October 7, 1994,
                    between AMSC Subsidiary Corporation and Trust Company of the
                    West as Trustee (Incorporated by reference to Exhibit 10.20a
                    to the  Company's  Annual Report on Form 10-K for the fiscal
                    year ended December 31, 1994 (File No. 0-23044))

         10.21  --  Authorized  Service Provider Agreement, dated March 1, 1993,
                    between  AMSC  Subsidiary  Corporation  and  McCaw  Cellular
                    Communications,  Inc.  (Incorporated by reference to Exhibit
                    10.21 to the  Company's  Registration  Statement on Form S-1
                    (Reg. No. 33-70468))

         10.23  --  Term  Loan  Agreement dated  May 28, 1993,  between  AMSC 
                    Subsidiary   Corporation   and  Northern   Telecom   Finance
                    Corporation,  amended by letter  agreement dated October 14,
                    1993  between  AMSC  Subsidiary   Corporation  and  Northern
                    Telecom Finance  Corporation.  (Incorporated by reference to
                    Exhibit  10.23 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))

         10.23a --  First Amendment to Term Loan Agreement dated as of April 8, 
                    1994,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation  (Incorporated  by reference to
                    Exhibit  10.23a to the  Company's  Quarterly  Report on Form
                    10-Q filed for the  period  ending  June 30,  1994 (File No.
                    0-23044))

         10.23b --  Second  Amendment  to Term  Loan  Agreement, dated August 1,
                    1995,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation.  (Incorporated by reference to
                    Exhibit  10.23b to the  Company's  Quarterly  Report on Form
                    10-Q filed for the period  ending  September  30, 1995 (File
                    No. 0-23044))

         10.23c --  Third Amendment to Term  Loan Agreement,  dated November 7, 
                    1995,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation  (Incorporated  by reference to
                    Exhibit  10.23c to the  Company's  Quarterly  Report on Form
                    10-Q filed for the period  ending  September  30, 1996 (File
                    No. 0-23044))

         10.23d --  Fourth  Amendment  to Term Loan  Agreement, dated October 1,
                    1996,  between  AMSC  Subsidiary  Corporation  and  Northern
                    Telecom Finance  Corporation  (Incorporated  by reference to
                    Exhibit  10.23d to the  Company's  Quarterly  Report on Form
                    10-Q filed for the period  ending  September  30, 1996 (File
                    No. 0-23044))

         10.24a --  Volume Purchasing Agreement, dated March 10, 1995,  between
                    AMSC  Subsidiary  Corporation  and  TNL  Navigation  Limited
                    (Incorporated  by reference to Exhibit  10.24a the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0-23044))

         10.24b --  First Amendment to Volume Purchasing Agreement, dated March 
                    10, 1995, between Trimble Navigation Limited and AMSC (filed
                    herewith)

         10.24c --  Second  Amendment  to  Volume  Purchasing  Agreement, dated 
                    January 28, 1997,  between  Trimble  Navigation  Limited and
                    AMSC (filed herewith)

         10.25  --  Master  Lease  Agreement,  dated June 23, 1993, between AMSC
                    Subsidiary Corporation and Digital Equipment Corporation and
                    Amendment to Master Lease Agreement  between AMSC Subsidiary
                    Corporation and Digital  Equipment  Corporation dated August
                    2, 1993  (Incorporated  by reference to Exhibit 10.25 to the
                    Company's  Registration  Statement  on Form  S-1  (Reg.  No.
                    33-70468))


                                       26

<PAGE>



         10.26 --   [Reserved]

         10.27 --   Telemetry, Tracking and Control Satellite Service Agreement,
                    dated  as  of  August  5,  1993,   between  AMSC  Subsidiary
                    Corporation and Hughes  Communications  Satellite  Services,
                    Inc.  (Incorporated  by  reference  to Exhibit  10.27 to the
                    Company's  Registration  Statement  on Form  S-1  (Reg.  No.
                    33-70468))

         10.28 --   Service Agreement for Mobile Telephone Service  and related
                    tariff  dated  September 3, 1993,  between  AMSC  Subsidiary
                    Corporation   and   Maritime    Cellular    Network,    Inc.
                    (Incorporated by reference to Exhibit 10.28 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.28a--   Modification  to Agreement for  Mobile  Telephone  Service, 
                    dated September 5, 1995, between AMSC Subsidiary Corporation
                    and  Maritime  Cellular  Networks,   Inc.  (Incorporated  by
                    reference  to  Exhibit  10.28a  to the  Company's  Quarterly
                    Report on Form 10-Q  filed for the period  ending  September
                    30, 1995 (File No. 0-23044))

         10.30 --   Agreement  dated  October 11,  1993,  among  AMSC,  Hughes 
                    Communications    Satellite   Services,    Inc.,   Singapore
                    Telecommunications  Ltd.,  Space  Technologies  Investments,
                    Inc.,  MTel Space  Technologies  Corporation  and MTel Space
                    Technologies,  L.P.  (Incorporated  by  reference to Exhibit
                    10.30 to the  Company's  Registration  Statement on Form S-1
                    (Reg. No. 33-70468))

         10.31 --   Form of Authorized Service Provider Agreement  (Incorporated
                    by reference to Exhibit 10.31 to the Company's  Registration
                    Statement on Form S-1 (Reg. No. 33- 70468))

         10.32 --   Agreement  for  Cooperation  in  Joint  Procurement  of MSS 
                    Systems,  dated September 19, 1988,  between American Mobile
                    Satellite   Consortium   Inc.   and   Telesat   Mobile  Inc.
                    (Incorporated by reference to Exhibit 10.32 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.33 --   Joint  Operating  Agreement,  dated April 25, 1990, between 
                    AMSC  and  Telesat   Mobile  Inc.  as  amended  by  Amending
                    Agreement dated October 18, 1993 among AMSC, AMSC Subsidiary
                    Corporation  and TMI  Communications  and  Company,  Limited
                    Partnership, as successor in interest to Telesat Mobile Inc.
                    (Incorporated by reference to Exhibit 10.33 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.34*--   Employee Stock Purchase Plan  (Incorporated by reference to 
                    Exhibit  10.34 to the  Company's  Registration  Statement on
                    Form S-1 (Reg. No. 33-70468))

         10.35 --   Agreement  dated  as  of  December 14, 1992  between  AMSC 
                    Subsidiary   Corporation   and  GTE   Spacenet   Corporation
                    (Incorporated by reference to Exhibit 10.35 to the Company's
                    Registration Statement on Form S-1 (Reg. No. 33-70468))

         10.36a--   Master  Agreement  dated March 30,  1994, between Washington
                    International  Teleport,  Inc.,  and AMSC  (Incorporated  by
                    reference to Exhibit  10.36a to the Company's  Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1993
                    (File No. 0-23044))

         10.36b--   Contract  Amendment  No.  A001,  dated July 1, 1994, between
                    Washington    International   Teleport,   Inc.,   and   AMSC
                    (Incorporated   by  reference  to  Exhibit   10.36b  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending September 30, 1994 (File No. 0-23044))

         10.36c--   Contract Amendment  No. A002,  dated July 1,  1994,  between
                    Washington    International   Teleport,   Inc.,   and   AMSC
                    (Incorporated   by  reference  to  Exhibit   10.36c  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending September 30, 1994 (File No. 0-23044)) 27

<PAGE>




         10.37 --   Mobile Satellite Services Agreement dated November 15, 1993 
                    and related tariff between AMSC  Subsidiary  Corporation and
                    National Satellite Networks, Inc. (Incorporated by reference
                    to Exhibit 10.37 to the Company's  Registration Statement on
                    Form S-1 (Reg. No. 33-70468))

         10.37a--   First  Amendment  to  Mobile  Satellite  Services Agreement
                    dated  as  of  March  31,  1994,   between  AMSC  Subsidiary
                    Corporation and National  Satellite Network  Holdings,  Inc.
                    (Incorporated   by  reference  to  Exhibit   10.10a  to  the
                    Company's Quarterly Report on Form 10-Q filed for the period
                    ending June 30, 1994 (File No. 0-23044))

         10.37b--   Facilities Management and Services Agreement dated November 
                    1, 1995 between NORCOM and AMSC.  (Incorporated by reference
                    to Exhibit  10.10a to the  Company's  Annual  Report on Form
                    10-K filed for the period ending December 31, 1995 (File No.
                    0-23044))

         10.40 --   Letter Agreement dated as of December 8, 1993, between AMSC 
                    Subsidiary Corporation and Andersen Consulting (Incorporated
                    by reference to Exhibit 10.40 to the Company's Annual Report
                    on Form 10-K for the fiscal  year ended  December  31,  1993
                    (File No. 0-23044))

         10.41*--   Form  of  Directors and  Officers  Indemnification Agreement
                    (Incorporated by reference to Exhibit 10.41 to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1993 (File No. 0-23044))

         10.42 --   DTE Design, Development, and Manufacturing Agreement, dated 
                    September 28, 1994, between AMSC Subsidiary  Corporation and
                    Omnidata  International,  Inc. (Incorporated by reference to
                    Exhibit  10.42 to the  Company's  Annual Report on Form 10-K
                    for the  fiscal  year  ended  December  31,  1994  (File No.
                    0-23044))

         10.43 --   Side Letter Agreement regarding  sales  of  Non-Squint  Mast
                    Antennas to AMSC,  dated  February  16,  1995,  between AMSC
                    Subsidiary   Corporation,   Tecom   Industries,   Inc.   and
                    Westinghouse    Electric    Corporation,    acting    though
                    Westinghouse  Electronics  Systems Company  (Incorporated by
                    reference to Exhibit 10.43 to the Company's Annual Report on
                    Form 10-K for the fiscal year ended  December 31, 1994 (File
                    No. 0-23044))

         10.44 --   CAL  Corporation  Agreement  for  the  development  of  the 
                    aeronautical MSAT terminal, dated December 22, 1994, between
                    AMSC    Subsidiary    Corporation    and   CAL   Corporation
                    (Incorporated by reference to Exhibit 10.44 to the Company's
                    Annual  Report  on Form  10-K  for  the  fiscal  year  ended
                    December 31, 1994 (File No. 0- 23044))

         10.44a--   Skycell(sm)  Satellite  Telephone  Service  Authorized Sales
                    Sales Agent Agreement between AMSC and CAL Corporation dated
                    December  20, 1995  (Incorporated  by  reference  to Exhibit
                    10.44a to the  Company's  Annual Report on Form 10-K for the
                    fiscal year ended December 31, 1995 (File No. 0-23044))

         10.45 --   Contract for  System  Enhancement,  dated  February 1, 1994,
                    between  AMSC  Subsidiary   Corporation   and   Westinghouse
                    Electric Corporation acting through Westinghouse  Electronic
                    Systems Company  (Incorporated by reference to Exhibit 10.45
                    to the  Company's  Annual Report on Form 10-K for the fiscal
                    year ended December 31, 1994 (File No. 0-23044))


                                       28

<PAGE>



         10.46 --   Agreement for the Manufacture, Delivery and Installation of 
                    Satellite Communications Equipment Supporting 6 TDMs per LES
                    and working to AMSC  Satellite,  dated  November  21,  1994,
                    between Hughes Network  Systems  Limited and AMSC Subsidiary
                    Corporation  (Incorporated  by reference to Exhibit 10.46 to
                    the Company's Annual Report on Form 10-K for the fiscal year
                    ended December 31, 1994 (File No. 0-23044))

         10.46a--   Amendment One to Agreement  Number  742-94,  dated December
                    15, 1994,  between Hughes Network  Systems  Limited and AMSC
                    Subsidiary Corporation (Incorporated by reference to Exhibit
                    10.46a to the  Company's  Annual Report on Form 10-K for the
                    fiscal year ended December 31, 1994 (File No. 0-23044))

         10.47 --   Form  of  Authorized Sales Agent Agreement (Incorporated by 
                    reference to Exhibit 10.47 to the Company's Annual Report on
                    Form 10-K for the fiscal year ended  December 31, 1994 (File
                    No. 0-23044))

         10.48 --   Letter  Agreement  dated  April 3,  1995  among J.P. Morgan 
                    Securities Inc.,  Morgan Guaranty Trust Company of New York,
                    Toronto Dominion Securities (USA) Inc., The Toronto-Dominion
                    Bank,   and   American   Mobile    Satellite    Corporation.
                    (Incorporated by reference to Exhibit 10.48 to the Company's
                    Quarterly  Report on Form 10-Q filed for the  period  ending
                    June 30, 1995 (File No. 0-23044))

         10.49 --   General  Services  Agreement  between  AMSC  Subsidiary 
                    Corporation  and  AT&T  Corp.,  acting  though  its  Network
                    Systems Group, dated April 4, 1995 (certain attachments have
                    not been  provided and will be  furnished to the  Commission
                    upon request) (Incorporated by reference to Exhibit 10.49 to
                    the  Company's  Quarterly  Report on Form 10-Q filed for the
                    period ending June 30, 1995 (File No. 0-23044))

         10.50 --   Securities  Purchase  Agreement dated as of January 19, 1996
                    among AMSC Subsidiary Corporation, American Mobile Satellite
                    Corporation,  Toronto  Dominion  Investments,  Inc.,  Morgan
                    Guaranty  Trust Company of New York,  Hughes  Communications
                    Satellite  Services,  Inc.  and The Toronto  Dominion  Bank.
                    (Incorporated by reference to Exhibit 10.50 to the Company's
                    Current  Report on Form 8-K filed January 23, 1996 (File No.
                    0-23044))

         10.51 --   Agreement for  Development of  High-Gain  Maritime  Mobile 
                    Terminals  between  AMSC  and  KVH  Industries,  Inc.  dated
                    September  19, 1995.  (Incorporated  by reference to Exhibit
                    10.51 to the Company's  Annual Report on Form 10-K filed for
                    the period ended December 31, 1996 (File No. 0-23044))

         10.52 --   Private Voice Network Service, Satellite Telephone Service, 
                    Facsimile,  and  Circuit  Switched  Data  Service  Agreement
                    between AMSC and AT&T  Corporation  dated  October 17, 1995.
                    (Incorporated by reference to Exhibit 10.52 to the Company's
                    Annual  Report  on Form  10-K  filed  for the  period  ended
                    December 31, 1996 (File No. 0-23044))

         10.53*--   1994  Stock  Option  Plan for  Non-Employee  Directors.  
                    (Incorporated by reference to Exhibit 10.53 to the Company's
                    Annual  Report  on Form  10-K  filed  for the  period  ended
                    December 31, 1996 (File No. 0-23044))

         10.54*--   Form of Executive Agreements (filed herewith)

         10.55 --   $150,000,000  Credit  Agreement  dated as of June 28, 1996, 
                    among AMSC Subsidiary Corporation, American Mobile Satellite
                    Corporation, the Banks Listed Therein, Morgan Guaranty Trust
                    Company of New York,  as  Documentation  Agent,  and Toronto
                    Dominion   (Texas),    Inc.,   as   Administrative    Agent.
                    (Incorporated by reference to Exhibit 10.55 to the Company's
                    Quarterly  Report on Form 10-Q  filed for the  period  ended
                    June 30, 1996 (File No. 0-23044))

                                       29

<PAGE>



         10.56 --   $75,000,000 Credit  Agreement  dated  as  of June 28, 1996, 
                    among AMSC Subsidiary Corporation, American Mobile Satellite
                    Corporation, the Banks Listed Therein, Morgan Guaranty Trust
                    Company of New York,  as  Documentation  Agent,  and Toronto
                    Dominion   (Texas),    Inc.,   as   Administrative    Agent.
                    (Incorporated by reference to Exhibit 10.56 to the Company's
                    Quarterly  Report on Form 10-Q  filed for the  period  ended
                    June 30, 1996 (File No. 0-23044))

         10.57 --   Guaranty Issuance Agreement dated  as of June 28, 1996,  by 
                    and  among   Hughes   Electronics   Corproation,   Singapore
                    Telecommunications  Ltd., Baron Capital Partners, L.P., AMSC
                    Subsidiary   Corporation  and  American   Mobile   Satellite
                    Corporation (Incorporated by reference to Exhibit XII to the
                    Amended and Restated  Schedule 13D dated July 1, 1996, filed
                    by Hughes  Communications  Satellite Services,  Inc., Hughes
                    Communications,   Inc.,  Hughes  Aircraft  Company,   Hughes
                    Electronics  Corporation and General Motors Corporation with
                    respect  to shares  of  Common  Stock,  $.01 par  value,  of
                    American Mobile  Satellite  Corporation).  (Incorporated  by
                    reference to Exhibit 10.57 to the Company's Quarterly Report
                    on Form 10-Q filed for the period  ended June 30, 1996 (File
                    No. 0-23044))

         10.57a--   Amendment No. 1 to Guaranty Issuance Agreement, dated as of 
                    March 27, 1997 (filed herewith)

         10.58 --   Guaranty  dated  as  of  June  28,  1996,  made  by  Hughes 
                    Electronics  Corporation to Toronto Dominion (Texas),  Inc.,
                    as  Administrative  Agent.  (Incorporated  by  reference  to
                    Exhibit 10.58 to the Company's Quarterly Report on Form 10-Q
                    filed for the period ended June 30, 1996 (File No. 0-23044))

         10.59 --   Warrant No. 1 for the Purchase of 3,750,000 Shares (subject 
                    to adjustment) of Common Stock of American Mobile  Satellite
                    Corporation issued to Hughes Electronics Corporation,  dated
                    June 28, 1996  (Incorporated by reference to Exhibit XIII to
                    the Amended and  Restated  Schedule  13D dated July 1, 1996,
                    filed by Hughes  Communications  Satellite  Services,  Inc.,
                    Hughes Communications, Inc., Hughes Aircraft Company, Hughes
                    Electronics  Corporation and General Motors Corporation with
                    respect  to shares  of  Common  Stock,  $.01 par  value,  of
                    American Mobile  Satellite  Corporation).  (Incorporated  by
                    reference to Exhibit 10.57 to the Company's Quarterly Report
                    on Form 10-Q filed for the period  ended June 30, 1996 (File
                    No. 0-23044))

         10.60 --   Registration  Rights  Agreement  dated  as of June 28, 1996,
                    among  American   Mobile   Satellite   Corporation,   Hughes
                    Electronics Corporation,  Singapore Telecommunications Ltd.,
                    and Baron Capital Partners,  L.P. (Incorporated by reference
                    to Exhibit  XIV to the  Amended and  Restated  Schedule  13D
                    dated July 1, 1996, filed by Hughes Communications Satellite
                    Services, Inc., Hughes Communications, Inc., Hughes Aircraft
                    Company,  Hughes Electronics  Corporation and General Motors
                    Corporation with respect to shares of Common Stock, $.01 par
                    value,   of   American   Mobile   Satellite    Corporation).
                    (Incorporated by reference to Exhibit 10.57 to the Company's
                    Quarterly  Report on Form 10-Q  filed for the  period  ended
                    June 30, 1996 (File No. 0-23044))

         10.61 --   Asset Sale Agreement dated as of November 22, 1996, by  and 
                    among  Rockwell  Collins,  Inc.  American  Mobile  Satellite
                    Corporation and AMSC Subsidiary Corporation (Incorporated by
                    reference to Exhibit 10.61 to the Company's  Current  Report
                    on Form 8-K dated  November 22, 1996,  and filed on December
                    9, 1996 (File No. 0-23044))

         11.1  --   Computation of Net Loss Per Share (filed herewith)


                                       30

<PAGE>



         21.1  --   Subsidiaries of AMSC (filed herewith)

         23.1  --   Consent of Arthur Andersen LLP (filed herewith)

         23.2  --   Consent of Deloitte & Touche LLP (Incorporated by reference
                    to Exhibit 10.61 to the Company's Current Report on Form 8-K
                    dated November 22, 1996, and filed on December 9, 1996 (File
                    No. 0-23044))

         27.1  --   Financial Data Schedule (filed herewith)

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


*        Management contract or compensatory plan or arrangement  required to be
         filed as an  exhibit  to this  report  pursuant  to Item  14(c) of this
         report.

(b)      Reports on Form 8-K:

         On November 22, 1996,  the Company  filed a Current  Report on Form 8-K
         describing in response to Item 2 - Acquisition or Disposition of Assets
         the  acquisition  of the assets of Rockwell  Collins,Inc.  ("Rockwell")
         relating to its Land Transportation  Electronics' Mobile Communications
         Satellite Service business (the "Business")  through which Rockwell had
         sold mobile  messaging  hardware  and services to  commercial  trucking
         fleets.

         On February  6, 1997,  the Company  filed an  Amendment  to its Current
         Report on Form 8-K providing under Item 7 - Financial  Statements,  Pro
         Forma Financial  Information  and Exhibits the financial  statements to
         AMSC's acquisition previously filed on December 9, 1996.


                                       31

<PAGE>


SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  registrant  has duly  caused  this report to be signed on its
behalf by the undersigned, thereunto duly authorized.

                                        AMERICAN MOBILE SATELLITE CORPORATION


                                        By  /s/GARY M. PARSONS
                                            ------------------
                                        Gary M. Parsons, 
                                        President and Chief Executive Officer

Date:  March 28, 1997

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following  persons on behalf of the  registrant and
in the capacities and on the dates indicated.

/s/GARY M. PARSONS             President, Chief Executive         March 28, 1997
- ------------------------       Officer and Director    
Gary M. Parsons                (principal executive officer)

/s/CHRISTOPHER COLAVITO
- ----------------------------   Vice President and Controller      March 28, 1997
Christopher Colavito           (principal accounting officer)

/s/JACK A. SHAW                Chairman of the Board of Directors March 28, 1997
- ----------------------------     
Jack A. Shaw

/s/STEVEN D. DORFMAN
- ----------------------------   Director                           March 28, 1997
Steven D. Dorfman

/s/DAVID A. JULIANO
- ----------------------------   Director                           March 28, 1997
David A. Juliano

/s/BILLY J. PARROTT
- ----------------------------   Director                           March 28, 1997
Billy J. Parrott

/s/ANDREW A. QUARTNER
- ----------------------------   Director                           March 28, 1997
Andrew A. Quartner

/s/RODERICK M. SHERWOOD, III
- ----------------------------   Director                           March 28, 1997
Roderick M. Sherwood, III

/s/MICHAEL T. SMITH
- ------------------------       Director                           March 28, 1997
Michael T. Smith

/s/ALBERT L. ZESIGER
- ------------------------       Director                           March 28, 1997
Albert L. Zesiger

                                       32

<PAGE>


                                      INDEX




Management's Discussion and Analysis of Financial Condition
          and Results of Operations..........................................F-1

Report of Independent Public Accountants.....................................F-8

Consolidated Statements of Loss..............................................F-9

Consolidated Balance Sheets.................................................F-10

Consolidated Statements of Stockholders' Equity.............................F-11

Consolidated Statements of Cash Flows.......................................F-13

Notes to Consolidated Financial Statements..................................F-14

Quarterly Financial Data....................................................F-30

Selected Financial Data.....................................................F-31




                                       F-i

<PAGE>



                     Management's Discussion and Analysis of
                     ---------------------------------------
                 Financial Condition and Results of Operations
                 ---------------------------------------------

General
- -------


The following  discussion and analysis  provides  information  which  management
believes  is  relevant  to an  assessment  and  understanding  of the  financial
condition and  consolidated  results of operations of American Mobile  Satellite
Corporation  (with its  subsidiaries,  "AMSC" or the "Company").  The discussion
should be read in conjunction  with the  consolidated  financial  statements and
notes thereto.

American Mobile Satellite  Corporation was incorporated in May 1988. Until 1996,
the Company was a development  stage company,  engaged  primarily in the design,
development,  construction,  deployment  and  financing  of a  mobile  satellite
communications  system (the "SKYCELL  System").  In December  1995,  the Company
initiated commercial voice service.  During 1996, the Company transitioned to an
operating company,  and currently  operates North America's first  high-powered,
satellite-based,  digital  mobile  communications  system.  The  SKYCELL  System
includes the Company's first satellite ("AMSC-1") launched successfully in April
1995, and a fixed communications ground segment (the "CGS").

In addition to historical  information,  this Form 10-K Annual  Report  contains
forward-looking statements. The forward- looking statements contained herein are
subject to certain risks and  uncertainties  that could cause actual  results to
differ  materially  from  those  reflected  in the  forward-looking  statements.
Factors  that might  cause such a  difference  include,  but are not limited to,
those discussed in the "Factors that could affect Future Operating  Results" and
"Liquidity and Capital Resources"  sections.  Readers are cautioned not to place
undue reliance on these forward- looking statements,  which reflect management's
analysis  only as of the date hereof.  The Company  undertakes  no obligation to
publicly   revise  these   forward-looking   statements  to  reflect  events  or
circumstances that arise after the date hereof.  Readers should carefully review
the risk factors  described in other  documents  the Company  files from time to
time  with the  Securities  and  Exchange  Commission,  including  the Form 10-Q
Quarterly Reports to be filed by the Company subsequent to this Form 10-K Annual
Report and any Current Reports on Form 8-K filed by the Company.

Overview
- --------

The Company's future operating  results could be adversely  affected by a number
of uncertainties and factors, including (i) the timely completion and deployment
of all the  Company's  products  and  related  services,  including  among other
things, availability of mobile telephones, data terminals and other equipment to
be used with the SKYCELL System  ("Subscriber  Equipment") being manufactured by
third  parties  over which the Company has limited  control,  (ii) the  market's
acceptance of the Company's  services,  (iii) the ability and the  commitment of
the Company's Authorized Sales Agents and other distribution  channels to market
and distribute the Company's services,  (vi) the Company's ability to modify its
organization,  strategy and product mix to maximize the market  opportunities in
light of changes therein,  (v) competition from existing companies which provide
services  using  existing  communications  technologies  and the  possibility of
competition  from companies  using new  technology in the future,  (vi) capacity
constraints arising from the reconfiguration of AMSC-1 as previously  disclosed,
(vii) additional  technical  anomalies that may occur within the SKYCELL System,
including those relating to AMSC-1,  which could impact, among other things, the
operation of the SKYCELL System and the cost,  scope or availability of in-orbit
insurance,  (viii)  the  ability  of the  Company  to  fully  integrate  certain
components  of the mobile data  service,  (ix)  Subscriber  Equipment  inventory
responsibilities and liabilities assumed by the Company including the ability of
the Company to realize the value of its inventory, and (x) the Company's ability
to satisfy the conditions to borrowing or secure additional  financing as may be
necessary.

The  Company's  operating  results  and capital  and  liquidity  needs have been
materially  affected by delays  experienced in the development and deployment of
the SKYCELL System.  In particular,  the Company's  marketing  efforts have been
materially affected by delays experienced in the development and availability of
Subscriber  Equipment.  Initial  Subscriber  Equipment for  Satellite  Telephone
Service  ("STS") use did not become  commercially  available until December 1995
with additional  configurations not available until the second, third and fourth
quarters of 1996.  In  addition,  the CGS did not support  facsimile  capability
until  January  1997.  The  impact of  these  delays on  the Company's marketing

                                       F-1

<PAGE>


efforts  has   substantially   decreased  the Company's anticipated revenues and
increased the Company's capital and liquidity needs. No assurance can  be  given
that additional  delays relating to the SKYCELL System or  Subscriber  Equipment
will not be  encountered  in the  future  and not have an adverse impact on the 
Company.

In addition, the markets for wireless  communications services are characterized
by rapid  technological  and other changes.  The Company's  success depends,  in
part,  on its  ability  to  respond  and  adapt  to  such  changes.  The  delays
experienced  in the  deployment of the SKYCELL  System and the  availability  of
Subscriber Equipment,  together with changes in market conditions,  have already
caused the Company to shift its marketing focus away from its initial  satellite
roaming service consumer product to targeted business applications,  such as the
maritime, natural resources,  transportation, and telecommunications industries.
As of December 31, 1996,  there were  approximately  20,300  subscribers  on the
SKYCELL System.  Charges to operations for depreciation  expense for the SKYCELL
System began in the fourth quarter of 1995 and accordingly,  it is expected that
future  charges  will be  significant.  Additionally,  the Company  discontinued
capitalization  of  interest  costs  in the  fourth  quarter  of 1995  upon  the
commencement of full commercial service. Interest expense in 1996 is significant
as a result of borrowings under the Interim Financing, the Short-Term Notes, and
the Bank Financing,  as well as the  amortization of borrowing costs incurred in
conjunction  with securing these  facilities.  It is  anticipated  that interest
costs  will  continue  to be  significant  as a result  of the  Bank  Financing,
discussed below.

The  Company  expanded  its  mobile  data  business  late  in 1996  through  the
acquisition  of  Rockwell  International  Corporation's  ("Rockwell")  dual mode
mobile  messaging and global  positioning and monitoring  service for commercial
trucking  fleets.  Rockwell was a private network  customer of the Company which
had  purchased  capacity  from the Company on AMSC-1.  In the  transaction,  the
Company assumed Rockwell's existing customer contracts,  and acquired Rockwell's
system  infrastructure  for  delivering  their mobile data  product,  as well as
Rockwell's rights to the multi-mode,  satellite-terrestrial  product. The assets
of the business were acquired  through the  assumption of the various  contracts
and  obligations of Rockwell  relating to the business;  no  additional,  direct
payments were made to Rockwell under the terms of the Asset Sale Agreement dated
as of November 22, 1996.

Years Ended December 31, 1996 and 1995
- --------------------------------------

Service  revenues,  which  include both the Company's  voice and data  services,
approximated $9.2 million for 1996 as compared to $6.9 million for 1995. Service
revenue  from  voice  services  approximated  $5.0  million  in 1996,  including
approximately  $1.3 million  attributable  to satellite  capacity  leased to TMI
Communications  and Company,  Limited  Partnership  ("TMI"),  a Canadian Limited
Partnership, under a commitment which was completed in May 1996. Service revenue
from  the  Company's  data  and  position   location   services   ("Mobile  Data
Communications Service")  approximated $4.0 million in 1996, as compared to $6.9
for 1995, a reduction of $2.9 million.  Prior to 1996, the Company  provided its
Mobile Data  Communications Service  using  satellite  capacity  leased from the
Communications  Satellite Corporation  ("COMSAT"),  the cost of which was passed
through to one customer ("Rockwell"). The decrease in Mobile Data Communications
Service revenue reflects the reduced revenue from Rockwell  resulting from lower
billings for the use of the lower cost AMSC-1 versus  billings  attributable  to
the leased COMSAT satellite applied on a pass-through basis. Of the data service
revenues,  36%  and 75%  were  attributable  to  Rockwell  for  1996  and  1995,
respectively.  As previously mentioned in the Overview, the Company acquired the
dual mode mobile  messaging and global  positioning  and  monitoring  service of
Rockwell in November 1996. At December 31, 1996 and 1995,  receivables  relating
to service revenues were $1.8 and $405,000, respectively.


Revenue from the sale of mobile data terminals and mobile  telephones  increased
from $1.9 million in 1995 to $18.5 million in 1996,  primarily  attributable  to
(i) the Company's  introduction  of certain voice products in the fourth quarter
of 1995 and the  resulting  sale of mobile  telephones,  and (ii) the  increased
availability  of mobile data  terminals  in 1996  compared  to 1995  following a
contract signed with a mobile data terminal manufacturer in February 1995.

The Company's costs and expenses have primarily increased in connection with the
start  of  full  commercial  service  in  December  1995.  Cost of  service  and
operations for 1996, which includes costs to support  subscribers and to operate
the SKYCELL  System,  were $30.5  million for 1996,  an increase of $6.5 million
from 1995.  Cost of service and operations for 1996 and 1995, as a percentage of
operating expenses, were 27% and 30%, respectively. The dollar increase in cost 

                                       F-2

<PAGE>



of service and operations was primarily attributable to (i) additional personnel
and related costs to support both existing and anticipated customer demand, (ii)
increased  costs  associated  with the  on-going  maintenance  of the  Company's
billing  systems and the CGS, and (iii) $6.5  million of  insurance  expense for
in-orbit  insurance  coverage for AMSC-1,  offset by the  elimination  of COMSAT
lease expense  reflecting  the  transition of the Company's  customers  from the
leased satellite to AMSC-1.  The decrease as a percentage of operating  expenses
was attributable to the overall increase in total operating  expenses.  The cost
of equipment  sold increased to $31.9 million in 1996 from $4.7 million in 1995,
and  represented  22% of total  operating  expenses  in 1996  versus 6% of total
operating  expenses in 1995. The increase in both dollars and as a percentage of
operating  expenses of the cost of equipment sold is primarily  attributable  to
(i) the Company's  introduction  of certain voice products in the fourth quarter
of 1995 and the resulting sale of mobile  telephones,  (ii) the  availability of
mobile data  terminals in 1996 compared to 1995,  (iii) a $4.2 million charge in
1996 for the  reconfiguration  of certain  components  to better  meet  customer
requirements,  and (iv) a $6.9 million write down of inventory to net realizable
value.  Sales and advertising  expenses were $24.5 million in 1996,  compared to
$22.8  million  in 1995.  Sales and  advertising  expenses  as a  percentage  of
operating  expenses  were 17% in 1996 and 29% in 1995.  The dollar  increase  of
sales and advertising expenses was primarily attributable to (i) additional head
count and personnel  related costs  associated with the increase in sales staff,
and (ii)  increased  costs directly  associated  with the increase in subscriber
acquisition programs,  offset by a $1.4 million charge, in 1995, associated with
the  re-acquisition  of  defective  equipment  located  at a  customer  site and
settlement  of related  disputes.  The  decrease as a  percentage  of  operating
expenses was attributable to the overall  increase in total operating  expenses.
General and administrative  expenses for 1996 were $17.5 million, an increase of
$1.0 million as compared to 1995. As a percentage of operating expenses, general
and administrative  expenses represented 12% in 1996 and 21% in 1995. The dollar
increase in general and  administrative  expenses for 1996  compared to 1995 was
primarily   attributable  to  (i)  approximately  $675,000  of  severance  costs
associated  with a management  restructuring  and (ii) an increase in facilities
rents and  utilities  of $236,000.  The  decrease of general and  administrative
expenses as a percentage of operating  expenses was  attributable to the overall
increase in operating expenses.  Depreciation and amortization expense was $43.4
million  and  $11.2  million  in  1996  and  1995,  respectively,   representing
approximately 29% and 15% of operating expenses for 1996 and 1995, respectively.
Both the dollar increase and the increase as a percentage of operating  expenses
in depreciation and amortization expense was attributable to the commencement of
depreciation of both AMSC-1 and related assets and the CGS in the fourth quarter
of 1995.

Interest and other income was $552,000 in 1996 compared to $4.5 million in 1995.
The decrease was a result of lower average cash balances.  The Company  incurred
$15.2  million of  interest  expense in 1996  compared  to  $916,000 of interest
expense  in  1995   reflecting   (i)  the   discontinuation   of  interest  cost
capitalization as a result of substantially completing the SKYCELL System in the
fourth quarter of 1995, (ii) the amortization of debt discount and debt offering
costs  (including  Guarantee  Warrants (see "Liquidity and Capital  Resources"))
relating to the Bridge  Financing and Bank Financing (see "Liquidity and Capital
Resources"), and (iii) higher outstanding loan balances as compared to 1995.

Net capital  reductions,  including  additions financed through vendor financing
arrangements, for 1996 for property and equipment were $51.0 million compared to
capital  expenditures  of  $86.7  million  in 1995.  The  decrease  was  largely
attributable to (i) the net proceeds of $65.8 million from the resolution of the
claims under the  Company's  satellite  insurance  contracts  and policies  (see
"Liquidity and Capital Resources"),  (ii) the purchase,  in the first quarter of
1995,  of  launch  insurance  at a cost  to the  Company  of  $42.8  million  in
connection with the Company's  launch  contract with Martin Marietta  Commercial
Launch Series, Inc., and (iii) the decrease in construction  activity as certain
components of the CGS were completed.

Years Ended December 31, 1995 and 1994
- --------------------------------------

Service  revenues  increased $3.2 million to $6.9 million for 1995 compared with
$3.7 million for 1994.  The increase in revenues was primarily  attributable  to
additional  satellite  capacity  leased by a customer.  Until December 1995, the
Company provided its Mobile Data Communications Service using satellite capacity
leased from COMSAT that the Company resold to its  customers.  In December 1995,
the Company  transitioned all Mobile Data Communications  Service customers from
the COMSAT  satellite to AMSC-1.  All of the Company's  service revenues through
1995 are attributable to its Mobile Data Communications  Service which commenced
revenue  service  in  1992.  Of  these  service  revenues,   75%  and  70%  were
attributable  to  one  customer for  the years ended December 31, 1995 and 1994,

                                       F-3

<PAGE>



respectively.  At December 31, 1995 and 1994,  receivables relating to operating
revenues were $405,000 and $446,000, respectively.  Equipment revenues increased
to $1.9  million in 1995,  as compared to $1.6  million in 1994,  primarily as a
result of increased Mobile Data Communications Service customers.

Operating  expenses  were $79.3  million for 1995,  an increase of $44.5 million
from  1994.  The  Company's  operating  expenses  have  primarily  increased  in
connection with the  commencement  of full commercial  service in December 1995.
Cost of service and  operations  expenses were $23.9 million and $10.3  million,
representing approximately 30% of operating expenses for both 1995 and 1994. The
dollar increase in service and operations expenses was primarily attributable to
additional customer demand for the Company's Mobile Data Communications  Service
requiring (i) additional  satellite  capacity leased from COMSAT,  commencing in
December  1994,  (ii)  additional  personnel  and related  costs to support both
existing and  anticipated  demand and (iii) $1.8  million of  insurance  expense
attributable to the 1995 portion of the in-orbit  insurance premium for coverage
of AMSC-1.  Cost of equipment  sales increased from $2.3 million in 1994 to $4.7
million in 1995, and represented  approximately 6% of operating expenses in 1995
as  compared  with 7% in  1994.  The  increase  in the  cost of  equipment  sold
reflected  (i) an increased  demand for Mobile Data  Communications  Service and
(ii) a $1.9 million write down of certain inventory components to net realizable
value.  The  decrease in cost of equipment  sales as a  percentage  of operating
expenses was attributable to the overall increase in operating  expenses.  Sales
and  marketing  expenses  were  $23.8  million  and $6.0  million,  representing
approximately 29% and 17% of operating expenses for 1995 and 1994, respectively.
Both the dollar increase and the increase as a percentage of operating  expenses
in sales and marketing  expenses were primarily  attributable to (i) significant
increases in head count and personnel  related  costs,  including an increase in
the sales staff and the development and staffing of a customer service center to
support the commencement of full commercial service,  (ii) increased advertising
and  promotional  costs  associated  with the  commencement  of full  commercial
service,   including  $2.5  million  of  inventory  charges  associated  with  a
promotional  program  to promote  sales of mobile  telephones  and  mobile  data
terminal  inventory,  (iii) a $1.8 million  writedown  of certain  assets to net
realizable value, (iv) a $1.8 million charge associated with the temporary delay
in the  delivery of certain  subscriber  equipment,  (v) a $1.4  million  charge
associated with the  reacquisition of defective  equipment located at a customer
site and settlement of related claims, and (vi) additional costs associated with
the transition of customers from COMSAT leased space capacity to AMSC-1. General
and administrative  expenses were $16.7 million and $11.7 million,  representing
approximately 21% and 33% of operating expenses for 1995 and 1994, respectively.
The dollar  increase  in  general  and  administrative  expenses  was  primarily
attributable  to  an  increase  of  $5.9  million  in  personnel-related   costs
associated  with hiring and training staff to support the Company's  information
systems and technology needs and to operate the billing systems developed by the
Company to support the commencement of full commercial service.  The decrease as
a percentage of operating  expenses in general and  administrative  expenses was
attributable to the overall  increase in operating  expenses.  Depreciation  and
amortization  expense  was  $11.2  million  and $4.5  million  in 1995 and 1994,
representing  approximately 14% and 13% of operating expenses for 1995 and 1994,
respectively.  Both the dollar  increase  and the  increase as a  percentage  of
operating expenses in depreciation and amortization  expense was attributable to
the  commencement  of depreciation of both AMSC-1 and related assets and the CGS
in the fourth quarter of 1995.

Interest and other  income was $4.5 million in 1995  compared to $8.5 million in
1994.  The decrease was primarily  attributable  to lower average cash balances.
Interest  expense in 1995 was $916,000.  Interest costs in 1994 were capitalized
as part of the Company's construction activities.

The Company incurred $5.6 million and capitalized $4.7 million of interest costs
in 1995 compared to $3.5 million  incurred and capitalized in 1994. The increase
in interest costs was primarily  attributable to both higher borrowing rates and
higher  outstanding loan balances.  Capital  expenditures,  including  additions
financed  through  vendor  financing  arrangements,  for 1995 for property under
construction  were $86.7 million compared to $58.8 million in 1994. The increase
in capital  expenditures  was primarily  attributable  to the purchase of launch
insurance  at a cost to the  Company  of $42.8  million in  connection  with the
Company's launch contract with Martin Marietta Commercial Launch Services, Inc.,
offset by the decrease in construction activity as the components of the SKYCELL
System were  readied  for full  commercial  service.  As a result of placing the
SKYCELL System in service in the fourth quarter of 1995, all related assets have
been  reclassified  to Property and Equipment in the  accompanying  consolidated
balance sheet.


                                       F-4

<PAGE>


Liquidity and Capital Resources
- -------------------------------

Adequate  liquidity  and capital  are  critical to the ability of the Company to
continue  as a  going  concern  and  to  fund  subscriber  acquisition  programs
necessary  to reach cash  positive  and  profitable  operations.  To satisfy its
ongoing  financing  needs,  the Company,  on June 28, 1996,  established  a $225
million debt facility with Morgan  Guaranty  Trust Company and Toronto  Dominion
Bank (the "Bank  Financing")  consisting of two  facilities:  (i) a $150 million
five-year,  multi-draw  term loan  facility  (the  "Term  Loan  Facility")  with
quarterly  payments  commencing  March 31, 1999 through and  including  June 30,
2001, and (ii) a $75 million  five-year  revolving credit facility with a bullet
maturity on June 30, 2001 (the "Working Capital  Facility").  As a result of the
receipt of insurance  proceeds in excess of $60.0 million (see below),  the Bank
Financing  was  subsequently  reduced to $219  million.  Proceeds  from the Bank
Financing  were used to repay the Company's  interim  financing and to refinance
short-term  Vendor  Financing,  and will be used  for  general  working  capital
purposes. As of March 20, 1997, the Company had drawn down $144.0 million of the
Term Loan  Facility at an annual  interest  rate of 5.8125% and $18.0 million of
the Working  Capital Facility at annual  interest  rates ranging from 5.6875% to
5.8125%.  The Company  concluded  that it could not complete the Bank  Financing
without  substantial  credit  support  from  its  principal   stockholders  (the
"Guarantees").   HEC,   Singapore   and  Baron  Capital   Partners,   L.P.  (the
"Guarantors")  guaranteed  $200 million of the Bank  Financing  (the  "Guarantee
Agreement") in exchange for compensation consisting principally of cash fees and
warrants  (the  "Guarantee  Warrants"),  allowing the  Guarantors  to purchase 5
million shares of the Company's Common Stock at a price of $24 per share.  Under
the terms of the Bank Financing and the Guarantee  Agreement,  borrowings  under
the Bank  Financing  are  contingent  upon the  satisfaction  by the  Company of
certain  performance  tests  relating to net  revenues,  number of  subscribers,
operating  cash flow and  earnings  before  interest,  taxes,  depreciation  and
amortization. Because of the slower than anticipated build-up of subscribers and
related revenues,  during the third and fourth quarters of 1996, the Company did
not meet all of these performance tests and required, and obtained, waivers from
the  Guarantors  permitting  the Company to borrow up to $155 million  under the
Bank Financing.  The Company subsequently received an additional waiver from the
Guarantors to borrow up to $162 million under the Bank Financing.

On March  27,  1997,  the  Company  reached  agreement  with the  Guarantors  to
eliminate  the  performance   tests  which  must  be  satisfied  for  subsequent
borrowings.  In  consideration  for this agreement,  the Company agreed with the
Guarantors  to reduce the exercise  price of the  Guarantee  Warrants to $13 per
share and to issue  additional  warrants to the  Guarantors  relating to 500,000
shares at the reduced  exercise price.  The Guarantee  Warrants,  at the date of
original  issuance,  were valued at $19.0 million;  the Guarantee  Warrants,  as
modified,  have not yet been formally valued.  The Guarantee  Warrants expire on
June 28,  2001.  The  revised  Guarantee  Agreement  places  limitations  on the
quarterly borrowings which the Company can make under the line as follows:  $170
million, $180 million, $190 million and $200 million in the first, second, third
and fourth  quarters of 1997,  respectively.  The Company  would  continue to be
subject to maintaining certain subscriber, revenue and debt to subscriber ratios
if the Guarantees are released.  Additionally, the Bank Financing places certain
restrictions  on the Company's  ability to pay  dividends,  other  indebtedness,
transactions  with affiliates,  and the acquisition of capital assets.  The Bank
Financing  is secured by the  pledge of  substantially  all of the assets of the
Company and certain of its subsidiaries.

The Company may need  additional  financing  in 1997 beyond the Bank  Financing.
There can be no assurance  that if additional  financing is required,  that such
financing  will be available or that the terms  thereof will be favorable to the
Company.  If the Bank  Financing  is not  sufficient,  the  Company may not have
adequate capital to fund its future operations.

Following negotiations of certain existing vendor debt arrangements (the "Vendor
Financing")  and ground  segment  obligations  ("Ground  Segment  Obligations"),
aggregating  $11.1  million at December  31,  1996,  the Company has arranged to
defer  repayment  of the Vendor  Financing  and a portion of the Ground  Segment
Obligation from September 30, 1996, until various dates in 1997.

The effect of these matters,  among others,  is that the Company  estimates that
its  peak  financing  requirement  in 1997  under  the  Bank  Financing  will be
approximately $190 million. The Company's actual peak financing requirements may
differ  materially from this estimate based on, among other factors,  shortfalls
from estimated  levels of operating  cashflows due to delays in the introduction
of certain products and services, the unavailability of Subscriber Equipment and
insufficient demand for the Company's  inventory of Subscriber  Equipment and/or
services.  The Company  expects that operating  revenues will be insufficient to
cover operating expenses until sometime in 1998 or beyond. See "Overview."

                                       F-5

<PAGE>




The Company filed a claim for indemnity under its launch  insurance with respect
to the anomalies leading to the reconfiguration of AMSC-1 (see "Other Matters").
On August 1, 1996,  the Company  reached a  resolution  of the claims  under its
satellite insurance  contracts and policies,  and received gross proceeds in the
amount of $66.0  million which were used to repay the Working  Capital  Facility
and portions of the Term Loan  Facility and the Vendor  Financing.  The carrying
value of the satellite was reduced by the amount of the net insurance  proceeds,
which  resulted in a reduction of  depreciation  charges  beginning in the third
quarter of 1996.

At December 31,  1996,  the Company had  remaining  contractual  commitments  to
purchase both mobile data  terminal  inventory  and mobile  telephone  inventory
approximating $28.6 million and capital expenditure commitments of approximately
$387,000. (See Note 10 to the consolidated financial statements).

A wholly owned subsidiary of the Company is subject to financing agreements that
limit  the  amount  of cash  dividends  and loans  that can be  advanced  to the
Company.   At  December  31,  1996,  all  of  the  subsidiary's  net  assets  of
approximately  $178.0  million were  restricted  under these  agreements.  These
restrictions  will have an impact on  American  Mobile  Satellite  Corporation's
ability to pay dividends.

The Company  has  conducted  preparatory  work for the  development  of the next
generation of its mobile communications satellite ("AMSC-2").  Based on observed
demand  for  satellite  mobile  communication  services,  and  the  slower  than
anticipated  acquisition of  subscribers,  the Company does not expect to expend
substantial resources in 1997 to proceed with the construction of AMSC-2. If the
Company decides to proceed with the  construction of AMSC-2 in 1998, the Company
would expect to launch  AMSC-2 in 2001.  If the Company  decides to proceed with
the deployment of AMSC-2, the total cost of constructing, launching and insuring
AMSC-2 and  constructing  related  ground  systems is currently  estimated to be
approximately  $600-$700  million.  The  Company  would  be  required  to  raise
substantial additional capital to finance this project.

Cash used in operating  activities was $113.6 million for 1996 compared to $53.3
million  for  1995.  The  increase  in cash  used in  operating  activities  was
primarily  attributable  to  (i)  increased  operating  losses,  (ii)  inventory
purchases  and (iii) the  payment  of  accounts  payable  and  accrued  expenses
reflecting  the  availability  of cash as a result of the Bank  Financing.  Cash
provided by investing  activities  was $50.9  million for 1996  compared to cash
used of $55.2 million in 1995.  The increase was primarily  attributable  to (i)
the proceeds from the  settlement  of the  Company's  claims under its satellite
insurance  contracts  and policies and (ii) a reduction in cash used for capital
expenditures  from $83.8 million in 1995 to $14.1 million in 1996. The reduction
in  capital   expenditures  in  1996  was  primarily  due  to  the  decrease  in
construction  activity as certain of the  components of the SKYCELL  System were
readied for full commercial service.  Cash provided by financing  activities was
$56.0 million in 1996 compared to cash used of $19.9 million in 1995, reflecting
the proceeds from the Bank Financing,  offset by the repayment of certain Vendor
Financing and other  long-term  debt.  Proceeds from the sale of debt securities
and  Common  Stock  were  $2.9  million  and  $10.2  million  for 1996 and 1995,
respectively.  Payments on long-term  debt and capital leases were $63.2 million
and $29.0 million for 1996 and 1995, respectively. In addition, the Company also
incurred $10.8 million and $1.1 million of debt issuance costs  associated  with
the  placement  of the Bank  Financing  in 1996 and  1995,  respectively.  As of
December 31, 1996, the Company had $2.2 million of cash and cash equivalents and
working capital of $8.5 million.


                                       F-6

<PAGE>




Regulation
- ----------

Like other mobile  communications  service  providers in the  telecommunications
industry,  the  Company  is  subject  to  substantial  and  constantly  changing
domestic,  foreign and international regulations governing the operations of the
SKYCELL System and mobile data terminals and mobile telephones. Currently, there
are  a  variety  of   regulatory   issues  being   considered   by  the  Federal
Communications Commission (the "FCC") which could impact the Company's financial
condition and future  operating  results.  Certain of these  matters,  including
proposals  to (i) impose an equal  access  requirement  on certain  mobile radio
service providers,  which may include the Company,  and (ii) require that mobile
radio service providers make enhanced 911 emergency services available to mobile
radio callers,  are discussed in Item 1, "Business -- Regulation," above. At the
present time there is not sufficient information available to determine what the
impact to the Company's  financial  condition or future operating  results would
be, if any, from proposals that are currently being considered by the FCC.

Other Matters
- -------------

As previously  reported,  the satellite  has, in the past,  experienced  certain
technological  anomalies,  most  significantly  with respect to its eastern beam
which resulted in the Company's  receipt of $66.0 million of insurance  proceeds
as discussed  above (see  "Liquidity  and Capital  Resources").  There can be no
assurance that the satellite will not experience subsequent anomalies that could
adversely impact the Company's  financial  condition,  results of operations and
cash flows.

Accounting Standards
- --------------------

In 1995, the Financial  Accounting Standards Board issued Statement of Financial
Accounting  Standards  ("SFAS")  No.121,   "Accounting  for  the  Impairment  of
Long-Lived  Assets and for Long-Lived  Assets to be Disposed Of." This Statement
requires that impairment  losses for such assets be based upon the fair value of
the assets.  The Statement,  applicable to fiscal years beginning after December
15, 1995,  was adopted by  management  as the primary basis by which the Company
measures impairment of the SKYCELL System and its related components. The impact
of  adopting  the  Statement  in 1996 has not  resulted  in the  recording  of a
provision for  impairment of  long-lived  assets,  but there can be no assurance
that a material provision for impairment will not be required in the future.

Also during 1995, the Financial  Accounting Standards Board issued SFAS No. 123,
"Accounting for Stock-Based  Compensation".  This Statement encourages, but does
not require,  a fair value based method of accounting for employee stock options
or similar equity  instruments.  During 1996,  the Company  elected to adopt the
provisions  of SFAS No. 123 by  disclosing - on a pro forma basis - the net loss
per share as if the fair value method had been adopted. Accordingly, adoption of
the  Statement in the fiscal year ending  December 31, 1996 had no impact on the
Company's financial condition or reported results of operations.





                                       F-7

<PAGE>






Report of Independent Public Accountants
- ----------------------------------------


To American Mobile Satellite Corporation:

We have audited the accompanying  consolidated balance sheets of American Mobile
Satellite  Corporation (a Delaware  corporation) and Subsidiaries as of December
31,  1996  and  1995,   and  the  related   consolidated   statements  of  loss,
stockholders'  equity and cash  flows for each of the three  years in the period
ended December 31, 1996. These financial  statements are the  responsibility  of
the Company's  management.  Our responsibility is to express an opinion on these
financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards  require that we plan and perform an audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the  financial  position of American  Mobile  Satellite
Corporation  and  Subsidiaries as of December 31, 1996 and 1995, and the results
of their  operations  and their  cash  flows for each of the three  years in the
period ended December 31, 1996, in conformity with generally accepted accounting
principles.



Washington, D.C.
March 27, 1997


                                       F-8

<PAGE>

American Mobile Satellite Corporation and Subsidiaries

Consolidated  Statements of Loss  (dollars in thousands,  except per share data)
for the years ended December 31, 1996, 1995, and 1994


<TABLE>
<CAPTION>


                                                        Years Ended December 31
                                                        -----------------------

<S>                                             <C>           <C>         <C> 
                                                     1996         1995        1994

REVENUES
      Services                                     $9,201       $6,873      $3,662
      Sales of equipment                           18,529        1,924       1,578
                                                   ------        -----       -----

      Total Revenues                               27,730        8,797       5,240

COSTS AND EXPENSES:
      Cost of service and operations               30,471       23,948      10,327
      Cost of equipment sold                       31,903        4,676       2,329
      Sales and advertising                        24,541       22,775       5,973
      General and administrative                   17,464       16,681      11,674
      Depreciation and amortization                43,390       11,218       4,541
                                                   ------       ------       -----

      Operating Loss                             (120,039)     (70,501)    (29,604)

INTEREST AND OTHER  INCOME                            552        4,500       8,501
INTEREST EXPENSE                                  (15,151)        (916)          -
                                                ----------    ---------   ---------

NET LOSS                                        ($134,638)    ($66,917)   ($21,103)
                                                ==========    =========   =========

LOSS PER SHARE OF COMMON STOCK                     ($5.38)      ($2.69)     ($0.86)



WEIGHTED-AVERAGE COMMON SHARES
      OUTSTANDING DURING THE PERIOD (000's)        25,041       24,900      24,672




The  accompanying  notes are an integral  part of these  consolidated  financial
statements.
</TABLE>
                                      F-9
<PAGE>

American Mobile Satellite Corporation and Subsidiaries

Consolidated Balance Sheets (dollars in thousands,  except share data) as of
December 31, 1996 and 1995

<TABLE>
<CAPTION>
<S>                                                                                    <C>        <C> 
ASSETS                                                                                     1996       1995

CURRENT ASSETS:
      Cash and cash equivalents                                                          $2,182     $8,865
      Inventory                                                                          38,034     10,552
      Prepaid in-orbit insurance                                                          5,080      4,823
      Accounts receivable-trade, less allowance for doubtful accounts 
         of $1,548 in 1996 and $231 in 1995                                               6,603      1,375
      Other current assets                                                               14,247      7,412
                                                                                         ------     ------
         Total current assets                                                            66,146     33,027

PROPERTY AND EQUIPMENT IN SERVICE - NET (gross balances include $134,737 and
         $130,998 purchased from related parties through 1996 and 1995, respectively    267,863    362,105

DEFERRED CHARGES AND OTHER ASSETS:
      (net of accumulated amortization of $10,597 in 1996 and $8,860 in 1995)
      (gross balances include $3,000 paid to related parties in 1996)                    16,164      3,219
                                                                                         ------      -----

         Total assets                                                                  $350,173   $398,351
                                                                                       ========   ========
LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:
      Accounts payable and accrued expenses                                             $42,625    $34,462
      Obligations under capital leases due within one year                                3,931      2,446
      Obligation to related party for equipment financing                                     -      6,874
      Current portion of long-term debt                                                  11,113     60,990
                                                                                         ------     ------
         Total current liabilities                                                       57,669    104,772

LONG-TERM LIABILITIES:
      Obligations under Term Loan Facility                                              127,000          -
      Capital lease obligations                                                           2,557      6,052
      Fair value of assets acquired in excess
         of purchase price (Note 12)                                                      3,395          -
      Other long-term liabilities                                                           852          -
                                                                                        -------      -----

         Total long-term liabilities                                                    133,804      6,052
                                                                                        -------      -----

         Total liabilities                                                              191,473    110,824

COMMITMENTS (Notes 9 and 10)

STOCKHOLDERS' EQUITY:
      Preferred Stock, par value $0.01: authorized 200,000 shares;
         no shares issued                                                                     -          -
      Common Stock, voting, par value $0.01: authorized 75,000,000 shares;
         25,097,577 shares issued and outstanding in 1996; 24,961,130 shares
         issued and outstanding in 1995                                                     251        250
      Additional paid-in capital                                                        451,259    448,757
      Common Stock purchase warrants                                                     23,848      3,440
      Unamortized guarantee warrants                                                    (17,100)         -
      Retained loss                                                                    (299,558)  (164,920)
                                                                                       ---------  ---------
        Total stockholders' equity                                                      158,700    287,527
                                                                                       ---------  ---------

        Total liabilities and stockholders' equity                                     $350,173   $398,351
                                                                                       =========  =========

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.
</TABLE>
                                      F-10
<PAGE>
American Mobile Satellite Corporation and Subsidiaries

Consolidated  Statements of Stockholders'  Equity (dollars in thousands,  except
share data) for the period from December 31, 1993 through December 31, 1996
<TABLE>
<CAPTION>

                                                                                 Common Stock                         Additional
                                                                            Amount          Shares         Par         Paid-in
                                                                           per share                      Value        Capital
<S>                                                                          <C>        <C>               <C>          <C>         
BALANCE, December 31, 1993                                                              24,542,652        $245         $440,585

   Common Stock issued in March, June, and September
      pursuant to Launch Services Contract                                   $21.00        245,712           3            5,158
   Common Stock issued in May and December for exercise
      of stock options and award of bonus stock                               15.69            701           -               11
   Common Stock issued in July under Stock Purchase Plan                      10.84          9,690           -              105
   Net Loss                                                                                      -           -                -
                                                                                        ----------        ----         --------

BALANCE, December 31, 1994                                                              24,798,755         248          445,859

   Common Stock issued in January under Stock Purchase Plan                   10.84          8,707           -               94
   Common Stock issued in April pursuant to
      Launch Services Contract                                                21.00         81,909           1            1,719
   Common Stock issued throughout the year  for exercise
      of stock options and award of bonus stock                               16.16         32,026           1              518
   Common Stock issued in July under Stock Purchase Plan                      10.73         22,170           -              238
   Common Stock issued in March, June, September
      and December under the 401(k) Savings Plan                              18.76         17,563           -              329
   Net Loss                                                                                      -           -                -
                                                                                        ----------        ----         --------
BALANCE, December 31, 1995                                                              24,961,130         250          448,757

   Common Stock issued in January under Stock Purchase Plan                   21.89         13,432           -              294
   Common Stock purchase warrants issued in January for Bridge Financing                         -           -                -
   Common Stock issued throughout the year for exercise
      of stock options and award of bonus stock                               16.41         37,320           -              612
   Common Stock issued upon exercise of Warrants                              22.53         37,500           1              844
   Common Stock purchase warrants issued in July for Bank Financing                              -           -                -
   Amortization of guarantee warrants                                                            -           -                -
   Common Stock issued in July under Stock Purchase Plan                      13.17         25,934           -              341
   Common Stock issued in March, June, September
      and December under the 401(k) Savings Plan                              18.47         22,261           -              411
   Net Loss                                                                                      -           -                -
                                                                                        ----------        ----         --------
BALANCE, December 31, 1996                                                              25,097,577        $251         $451,259
                                                                                        ----------        ----         --------




The  accompanying  notes are an integral  part of these  consolidated  financial
statements.
</TABLE>
                                      F-11
<PAGE>

<TABLE>
<CAPTION>
Consolidated Statements of Stockholders' Equity (dollars in thousands, except 
share data) for the period from December 31, 1993 through December 31, 1996 
(continued)

                                                                               Common       Unamortized
                                                                           Stock Purchase    Guarantee      Retained
                                                                              Warrants       Warrants         Loss          Total

<S>                                                                           <C>         <C>           <C>             <C>     
BALANCE, December 31, 1993                                                     $3,440       $     -       ($76,900)      $367,370

   Common Stock issued in March, June, and September
      pursuant to Launch Services Contract                                          -             -              -          5,161
   Common Stock issued in May and December for exercise
      of stock options and award of bonus stock                                     -             -              -             11
   Common Stock issued in July under Stock Purchase Plan                            -             -              -            105
   Net Loss                                                                         -             -        (21,103)       (21,103)
                                                                              -------       --------       --------       --------

BALANCE, December 31, 1994                                                      3,440             -        (98,003)       351,544

   Common Stock issued in January under Stock Purchase Plan                         -             -              -             94
   Common Stock issued in April pursuant to
      Launch Services Contract                                                      -             -              -          1,720
   Common Stock issued throughout the year  for exercise
      of stock options and award of bonus stock                                     -             -              -            519
   Common Stock issued in July under Stock Purchase Plan                            -             -              -            238
   Common Stock issued in March, June, September
      and December under the 401(k) Savings Plan                                    -             -              -            329
   Net Loss                                                                         -             -        (66,917)       (66,917)
                                                                              --------        ------       --------      ---------
BALANCE, December 31, 1995                                                      3,440             -       (164,920)       287,527

   Common Stock issued in January under Stock Purchase Plan                         -             -              -            294
   Common Stock purchase warrants issued in January for Bridge Financing        2,253             -              -          2,253
   Common Stock issued throughout the year for exercise
      of stock options and award of bonus stock                                     -             -              -            612
   Common Stock issued upon exercise of Warrants                                 (845)            -              -              -
   Common Stock purchase warrants issued in July for Bank Financing            19,000       (19,000)             -              -
   Amortization of guarantee warrants                                               -         1,900              -          1,900
   Common Stock issued in July under Stock Purchase Plan                            -             -              -            341
   Common Stock issued in March, June, September
      and December under the 401(k) Savings Plan                                    -             -              -            411
   Net Loss                                                                         -             -       (134,638)      (134,638)
                                                                              --------      --------       --------       --------
BALANCE, December 31, 1996                                                    $23,848      ($17,100)     ($299,558)      $158,700
                                                                              --------      --------       --------       --------

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.
</TABLE>

                                      F-12
<PAGE>
American Mobile Satellite Corporation and Subsidiaries

Consolidated Statements of Cash Flows (dollars in thousands) for the years ended
December 31, 1996, 1995, and 1994
<TABLE>
<CAPTION>


                                                                                       Years Ended December 31
                                                                                       -----------------------

<S>                                                                            <C>         <C>        <C> 
                                                                                    1996       1995       1994

CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss                                                                       ($134,638)  ($66,917)  ($21,103)
Adjustments to reconcile net loss to net cash used in operating activities:
     Amortization of debt discount and issuance costs                              5,721          -          -
     Depreciation and amortization                                                43,307     11,218      4,541
     Changes in assets and liabilities:
        Inventory                                                                (27,482)   (10,438)       (34)
        Prepaid in-orbit insurance                                                  (257)    (4,823)         -
        Trade accounts receivable                                                 (5,229)       218       (383)
        Other current assets                                                       1,970     (4,230)      (964)
        Accounts payable and accrued expenses                                      1,672     23,414        790
        Other assets and liabilities                                               1,347     (1,730)    (1,285)
                                                                                   -----     -------    -------
Net cash used in operating activities                                           (113,589)   (53,288)   (18,438)


CASH FLOWS FROM INVESTING ACTIVITIES:
Insurance proceeds applied to equipment in service                                66,000          -          -
Additions to property and equipment                                              (14,054)   (83,776)   (50,762)
Proceeds from sales of short-term investments                                          -     28,717     66,178
Purchases of short-term investments                                                    -          -    (94,895)
Deferred charges and other assets                                                 (1,000)      (169)      (763)
Other asset sales                                                                      -          -        438
                                                                                  ------     ------     ------
Net cash provided by (used in) investing activities                               50,946    (55,228)   (79,804)


CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of Common Stock                                             1,247      2,569      5,277
Principal payments under capital leases                                           (3,994)      (538)      (141)
Payments on notes payable                                                              -          -    (27,667)
Proceeds from short-term borrowings                                               70,000          -          -
Payments on short-term borrowings                                                (70,000)         -          -
Proceeds from Term Loan Facility                                                 127,000          -          -
Proceeds from debt issuance                                                        1,700      7,630     19,000
Payments on long-term debt                                                       (59,190)   (28,486)    (4,000)
Debt issuance costs                                                              (10,803)    (1,081)         -
                                                                                  ------     ------      -----
Net cash provided by (used in) financing activities                               55,960    (19,906)    (7,531)


Net decrease in cash and cash equivalents                                         (6,683)  (128,422)  (105,773)


CASH AND CASH EQUIVALENTS, beginning of period                                     8,865    137,287    243,060
                                                                                   -----    -------    -------


CASH AND CASH EQUIVALENTS, end of period                                          $2,182     $8,865   $137,287
                                                                                  ======     ======   ========

Supplemental Cash Flow Information:

     Interest Payments                                                            $9,431     $5,574     $2,787
                                                                                  ======     ======     ======

The  accompanying  notes are an integral  part of these  consolidated  financial
statements.
</TABLE>

                                      F-13
<PAGE>
AMERICAN MOBILE SATELLITE CORPORATION AND SUBSIDIARIES
- ------------------------------------------------------

Notes to Consolidated Financial Statements
- ------------------------------------------
as of December 31, 1996, 1995 and 1994
- --------------------------------------

1. ORGANIZATION, BUSINESS AND LIQUIDITY
- ---------------------------------------

American Mobile Satellite  Corporation was incorporated on May 3, 1988, by eight
of the initial applicants for the mobile satellite services license, following a
determination by the Federal  Communications  Commission ("FCC") that the public
interest  would be best served by granting  the license to a  consortium  of all
willing,  qualified applicants. The FCC has authorized American Mobile Satellite
Corporation to construct, launch, and operate a mobile satellite services system
(the "SKYCELL System") to provide a full range of mobile voice and data services
via satellite to land, air and sea-based  customers in a service area consisting
of the continental United States,  Alaska,  Hawaii, Puerto Rico, the U.S. Virgin
Islands, U.S. coastal waters,  international waters and airspace and any foreign
territory where the local government has authorized the provision of service. In
March  1991,  American  Mobile  Satellite  Corporation  transferred  the  mobile
satellite  services license ("MSS license") to a wholly owned  subsidiary,  AMSC
Subsidiary   Corporation   ("AMSC   Subsidiary").   American  Mobile   Satellite
Corporation has six other subsidiaries, two of which are inactive and four whose
limited  activities do not require material  resources at this time. On April 7,
1995, the Company  successfully  launched its first satellite  ("AMSC-1"),  from
Cape Canaveral, Florida.

American Mobile Satellite  Corporation (together with its subsidiaries "AMSC" or
the  "Company") is devoting its efforts to expanding a developing  business.  As
further discussed in Management's Discussion and Analysis of Financial Condition
and Results of Operations,  this effort involves substantial risk. Specifically,
future  operating  results will be subject to  significant  business,  economic,
regulatory,  technical,  and competitive  uncertainties and  contingencies.  The
integration of the  components of the SKYCELL  System is a complex  undertaking.
Delays in the integration of the SKYCELL System have already  occurred and there
can be no  assurance  that  further  delays will not occur.  Depending  on their
extent and timing,  these factors individually or in the aggregate could have an
adverse  effect  on the  Company's  financial  condition  and  future  operating
results.

Liquidity and Financing Requirements
- ------------------------------------

Adequate  liquidity  and capital  are  critical to the ability of the Company to
continue  as a  going  concern  and  to  fund  subscriber  acquisition  programs
necessary  to reach cash  positive  and  profitable  operations.  To satisfy its
ongoing  financing  needs,  the Company,  on June 28, 1996,  established  a $225
million debt facility with Morgan  Guaranty  Trust Company and Toronto  Dominion
Bank (the "Bank  Financing")  consisting of two  facilities:  (i) a $150 million
five-year,  multi-draw  term loan  facility  (the  "Term  Loan  Facility")  with
quarterly payments commencing March 31, 1999 through and including June 30, 2001
and  (ii) a $75  million  five-year  revolving  credit  facility  with a  bullet
maturity on June 30, 2001 (the "Working Capital  Facility").  As a result of the
receipt of insurance  proceeds in excess of $60.0 million (see below),  the Bank
Financing  was  subsequently  reduced to $219  million.  Proceeds  from the Bank
Financing were used to repay the Interim Financing and the Short-Term Notes (see
Note 7) and to  refinance  existing  short-term  vendor debt  arrangements  (the
"Vendor Financing"),  and for general working capital purposes.  As of March 20,
1997,  the Company had drawn down $144.0 million of the Term Loan Facility at an
annual  interest  rate of  5.8125%  and $18.0  million  of the  Working  Capital
Facility at annual  interest rates ranging from 5.6875% to 5.8125%.  The Company
concluded  that it could not complete  the Bank  Financing  without  substantial
credit  support  from  its  principal  stockholders  (the  "Guarantees").   HEC,
Singapore and Baron Capital Partners,  L.P. (the  "Guarantors")  guaranteed $200
million  of  the  Bank  Financing  in  exchange  for   compensation   consisting
principally of cash fees and warrants (the "Guarantee  Warrants"),  allowing the
Guarantors to purchase 5 million shares of the Company's Common Stock at a price
of $24 per  share.  Under  the  terms of the Bank  Financing  and the  Guarantee
Agreement,   borrowings  under  the  Bank  Financing  are  contingent  upon  the
satisfaction  by the  Company  of  certain  performance  tests  relating  to net
revenues,  number  of  subscribers,  operating  cash  flow and  earnings  before
interest,  taxes,  depreciation  and  amortization.  Because of the slower  than
anticipated  build-up of subscribers and related revenues,  during the third and
fourth quarters of 1996, the Company did not meet all of these performance tests
and required,  and obtained,  waivers from the Guarantors permitting the Company
to borrow up to $155 million under the Bank Financing.  The Company subsequently
received  an  additional  waiver  to borrow  up to $162  million  under the Bank
Financing.

                                      F-14

<PAGE>





On March  27,  1997,  the  Company  reached  agreement  with the  Guarantors  to
eliminate  the  performance   tests  which  must  be  satisfied  for  subsequent
borrowings.  In  consideration  for this agreement,  the Company agreed with the
Guarantors  to reduce the exercise  price of the  Guarantee  Warrants to $13 per
share and to issue  additional  warrants to the  Guarantors  relating to 500,000
shares at the reduced  exercise price.  The Guarantee  Warrants,  at the date of
original  issuance,  were valued at $19.0 million;  the Guarantee  Warrants,  as
modified,  have not yet been formally valued.  The Guarantee  Warrants expire on
June 28,  2001.  The  revised  Guarantee  Agreement  places  limitations  on the
quarterly borrowings which the Company can make under the line as follows:  $170
million, $180 million, $190 million and $200 million in the first, second, third
and fourth  quarters of 1997,  respectively.  The Company  would  continue to be
subject to maintaining certain subscriber, revenue and debt to subscriber ratios
if the Guarantees are released.  Additionally, the Bank Financing places certain
restrictions  on the Company's  ability to pay  dividends,  other  indebtedness,
transactions  with affiliates,  and the acquisition of capital assets.  The Bank
Financing  is secured by the  pledge of  substantially  all of the assets of the
Company and certain of its subsidiaries.

The Company may need  additional  financing  in 1997 beyond the Bank  Financing.
There can be no assurance  that if additional  financing is required,  that such
financing  will be available or that the terms  thereof will be favorable to the
Company.  If the Bank  Financing  is not  sufficient,  the  Company may not have
adequate  capital  to fund its  future  operations.  The  Company  expects  that
operating  revenues  will be  insufficient  to cover  operating  expenses  until
sometime in 1998 or beyond.

The Company filed a claim for indemnity under its launch  insurance with respect
to the anomalies leading to the reconfiguration of AMSC-1 (see "Other Matters").
On August 1, 1996,  the Company  reached a  resolution  of the claims  under its
satellite insurance  contracts and policies,  and received gross proceeds in the
amount of $66.0  million which were used to repay the Working  Capital  Facility
and portions of the Term Loan  Facility and the Vendor  Financing.  The carrying
value of the satellite was reduced by the amount of the net insurance  proceeds,
which  resulted in a reduction of  depreciation  charges  beginning in the third
quarter of 1996.


2. SIGNIFICANT ACCOUNTING POLICIES
- ----------------------------------

Development Stage Company
- -------------------------

Consistent  with  Statement of Financial  Accounting  Standards  ("SFAS") No. 7,
"Accounting and Reporting by Development Stage  Enterprises," the Company ceased
to be considered a development  stage company in the fourth quarter of 1996 with
the generation of significant revenue from its voice products and services.

Accounting Estimates
- --------------------

The preparation of financial  statements in conformity  with generally  accepted
accounting   principles  (GAAP)  requires   management  to  make  estimates  and
assumptions  that affect the reported  amount of assets and  liabilities  at the
date of the  financial  statements  and the  reported  amounts of  revenues  and
expenses  during the reporting  period.  Actual  results could differ from those
estimates.  The  Company's  most  significant  estimates  relate to the recorded
reserves for inventory and committed  inventory  purchases and the allowance for
doubtful accounts receivable.

Consolidation
- -------------

The  consolidated  financial  statements  include  the  accounts of AMSC and its
subsidiaries,  all of which  are  wholly  owned.  All  significant  intercompany
transactions and accounts have been eliminated.

                                      F-15

<PAGE>




Cash Equivalents and Short-term Investments
- -------------------------------------------

The Company considers highly liquid investments with remaining  maturities of 90
days or  less at the  time of  acquisition  to be cash  equivalents.  Short-term
investments are stated at amortized cost, which approximates  market and consist
of securities with maturities in excess of three months but less than one year.

Inventories
- -----------

Inventories,  which consist primarily of finished goods, are stated at the lower
of cost or market.  Cost is determined  using the weighted  average cost method.
For purposes of evaluating market value of its inventory, consideration is given
to   the   rapid   technological   changes   which   occur   in   the   wireless
telecommunications  industry  and  the  impact  those  changes  may  have on the
saleability of its inventory.  In evaluating the  realizability of the Company's
inventory investment,  management considers both inventory on hand and inventory
which it has committed to purchase.  During 1996 and 1995, the Company  recorded
charges  to Cost of  Equipment  Sold in the  amount  of $11.1  million  and $1.9
million,  respectively,  related to the realizability of the Company's inventory
investment.

Fair Value of Financial Instruments
- -----------------------------------

SFAS No. 107, "Disclosures about Fair Value of Financial  Instruments," requires
disclosures of the fair value of certain financial instruments.  For purposes of
this disclosure, the fair value of a financial instrument is the amount at which
the  instrument  could be exchanged  in a current  transaction  between  willing
parties.  Cash and cash  equivalents,  trade  accounts  receivable  and accounts
payable approximate fair value because of the relatively short maturity of these
instruments. As a result of the Guarantees by certain related parties (see Note 
1) associated with the Bank Financing,  it is not  practicable  to estimate  the
fair value of the Bank Facility.  The fair  value of  other  debt  approximates 
carrying  value  because  the  related  debt  has  variable  interest cost based
on current market rates.

Concentrations of Credit Risk
- -----------------------------

Financial instruments which potentially subject the Company to concentrations of
credit risk  consist  principally  of  temporary  cash  investments,  short-term
investments  and accounts  receivable.  The Company  places its  temporary  cash
investments  and short-term  investments in debt  securities  such as commercial
paper,  time  deposits,   certificates  of  deposit,  bankers  acceptances,  and
marketable  direct  obligations  of the United  States  Treasury.  The Company's
intent is to hold its investments in debt  securities to maturity.  To date, the
majority of the Company's business has been transacted with  telecommunications,
natural resources and transportation companies,  including maritime and trucking
companies located  throughout the United States. The Company grants credit based
on an  evaluation  of the  customer's  financial  condition,  generally  without
requiring  collateral  or  deposits.   Exposure  to  losses  on  trade  accounts
receivable,  for both service and for inventory sales, is principally  dependent
on each customer's financial condition.  Sales to one customer  approximated 16%
and 75% of service  revenues  for the years  ended  December  31, 1996 and 1995,
respectively. The Company anticipates that its credit risk with respect to trade
accounts  receivable  in the future will continue to be  diversified  due to the
large number of  customers  expected to comprise  the  Company's  base and their
expected dispersion across many different industries and geographies.

Property and Equipment
- ----------------------

Property and equipment is recorded at cost and depreciated  over its useful life
using the straight line method.  Assets recorded as capital leases are amortized
over the shorter of their useful lives or the term of the lease.  The  estimated
useful lives of office  furniture  and equipment  vary from 2-10 years,  and the
Communications Ground Segment ("CGS") is depreciated over 8 years.


                                      F-16

<PAGE>


In  the  fourth  quarter  of  1995,  with  the  successful   completion  of  the
construction of the Company's  SKYCELL System and the offering and  availability
of certain voice products and related services,  the Company  transferred assets
previously  classified as Property under  Construction to Property and Equipment
in  Service.   In  connection  with  this  transition,   the  Company  commenced
depreciation of the SKYCELL System in the fourth quarter of 1995. The Company is
depreciating the Space Segment over its estimated useful life of 10 years, which
was based on several  factors,  including  current  conditions and the estimated
remaining fuel of AMSC-1.  The original  estimated  useful live is  periodically
reviewed using current Telemetry Tracking and Control ("TT&C") data. To date, no
significant  change in the  original  estimated  useful life has  resulted.  The
telecommunications  industry is subject to rapid technological  change which may
require the Company to revise the  estimated  useful lives of AMSC-1 and the CGS
or to adjust their carrying  amounts.  The Company has also capitalized  certain
costs to develop and implement its computerized  billing system. These costs are
included in property and equipment and are depreciated over 8 years.


Software Development Costs
- --------------------------

The Company  capitalizes costs related to the development of certain software to
be used with its mobile  messaging  and position  location  service (the "Mobile
Data  Communications  Service") product.  The Company commenced  amortization of
these costs in the first  quarter of 1996.  These costs will be  amortized  over
three  years.  As of  December  31,  1996 and  1995,  net  capitalized  software
development  costs were $3.6  million and $1.9  million,  respectively,  and are
included in property and equipment in the accompanying balance sheets.

Deferred Charges and Other Assets
- ---------------------------------

Other assets  primarily  consist of unamortized  financing  costs and debt issue
costs  associated with the existing Vendor  Financing  arrangements and the Bank
Financing.  The  Company  had $14.9  million  and $2.4  million  of  unamortized
financing costs recorded at December 31, 1996 and 1995, respectively.  Financing
costs are  amortized  over the term of the related  facility  using the straight
line method, which approximates the effective interest method.

Revenue Recognition
- -------------------

The Company  recognizes service revenue when  communications  services have been
rendered.  Equipment sales are recognized upon shipment of products and customer
acceptance, if required.

Research and Development Costs
- ------------------------------

Research and  development  costs are expensed as  incurred.  Such costs  include
internal  research  and  development  activities  and expenses  associated  with
external product development  agreements.  Total expenses related to development
of  technologies  and  improvement to technologies  approximated  $57,000,  $1.8
million, and $1.0 million for 1996, 1995, and 1994, respectively.

Advertising Costs
- -----------------

Advertising  costs are charged to  operations  in the year  incurred and totaled
$6.0 million, $6.5 million, and $1.2 million for 1996, 1995, 1994, respectively.

Stock Based Compensation
- ------------------------

The Company  accounts for employee  stock options using the method of accounting
prescribed by Accounting  Principles  Board ("APB") Opinion No. 25,  "Accounting
for Stock Issued to Employees."  Generally,  no expense is recognized related to
the Company's  stock options  because the option's  exercise price is set at the
stock's fair market value on the date the option is granted.  Effective  January
1, 1996,  the  Company  adopted  SFAS No. 123 by making  the  required  footnote
disclosures  (see Note 5).  Accordingly,  adoption of this new  standard  has no
impact on the Company's reported financial position or results of operations.



                                      F-17

<PAGE>

Assessment of Asset Impairment
- ------------------------------

SFAS No.  121  "Accounting  for the  Impairment  of  Long-Lived  Assets  and for
Long-Lived  Assets to be Disposed Of" requires that  impairment  losses for such
assets  be based  upon the fair  value of the  assets,  and was  adopted  by the
Company as the primary  basis by which the Company  measures  impairment  of the
SKYCELL System and its related components.  The impact of adopting the Statement
in 1996 has not  resulted in the  recording  of a provision  for  impairment  of
long-lived  assets,  but there can be no assurance that a material provision for
impairment will not be required in the future.

Loss Per Share
- --------------

Loss per  common  share is based on the  weighted-average  number  of  shares of
Common Stock outstanding  during the period.  Stock options and warrants are not
reflected in the computation since their effect would be antidilutive.


Reclassifications
- -----------------

Certain  amounts for prior years have been  reclassified to conform with current
year presentation.


3. STOCKHOLDERS' EQUITY
- -----------------------

The Company has  authorized  200,000  shares of Preferred  Stock and  75,000,000
shares of  Common  Stock.  The par  value  per share is $0.01 for each  class of
stock.  For each share held,  Common  stockholders  are  entitled to one vote on
matters  submitted  to the  stockholders.  Cumulative  voting  applies  for  all
elections of directors of the Company.

The Preferred Stock may be issued in one or more series at the discretion of the
Board of Directors (the "Board"),  without  stockholder  approval.  The Board is
authorized   to  determine   the  number  of  shares  in  each  series  and  all
designations, rights, preferences, and limitations on the shares in each series,
including,  but not limited to, determining whether dividends will be cumulative
or noncumulative.

Certain   controlling   stockholders   of  the  Company   have  entered  into  a
Stockholders'  Agreement (the "Agreement") which contains provisions relating to
the election of directors,  procedures for maintaining compliance with the FCC's
alien ownership  restrictions,  certain  restrictions on the transfer,  sale and
exchange  of Common  Stock,  and  procedures  for  appointing  directors  to the
Executive  Committee of the Board,  among  others.  The  Agreement  continues in
effect until  terminated by an affirmative  vote of holders of  three-fourths of
the  Company's  Common  Stock held by parties to the  Agreement.  Other  matters
relating  to the  Company's  governance  of the  Company  are set  forth  in the
Certificate of Incorporation and Bylaws.


As of  December  31,  1996,  the Company had  reserved  Common  Stock for future
issuance as detailed below.


<TABLE>
<CAPTION>
<S>                                                                    <C>     
Shares issuable upon exercise of warrants, Interim Financing Warrants 
       and Guarantee Warrants                                          5,974,596
Amended and Restated Stock Option Plan for Employees                   1,929,446
Stock Option Plan for Non-Employee Directors                              50,000
Employee Stock Purchase Plan                                             220,067
Defined Contribution Plan                                                 35,176
                                                                        --------
        Total                                                          8,209,285
                                                                       =========
</TABLE>



                                      F-18

<PAGE>



4. PROPERTY AND EQUIPMENT
- -------------------------
<TABLE>
<CAPTION>

Property and equipment consists of the following:

                                                                December 31
<S>                                                     <C>             <C> 
(in thousands)                                             1996            1995

Space Segment                                           $187,386        $253,302
Ground Segment                                           104,227          95,650
Office equipment and furniture                            16,684          13,494
Mobile Data Communications Service                        21,013          18,216
                                                          ------          ------
                                                         329,310         380,662
Less accumulated depreciation and amortization            61,447          18,557
                                                          ------          ------
Property and equipment, net                             $267,863        $362,105
                                                        ========        ========

</TABLE>

                                      F-19

<PAGE>





5. STOCK OPTIONS
- ----------------

The Company has two active stock option  plans.  The American  Mobile  Satellite
Corporation  1989 Amended and  Restated  Stock  Option Plan for  Employees  (the
"Plan") permits the grant of non-statutory  options and the award of bonus stock
up to a total of 2 million  shares of Common  Stock.  On January 24,  1996,  the
Board  authorized  an  amendment  to the Plan to  increase  the number of shares
authorized to 3.5 million,  subject to shareholder  approval in May 1997.  Under
the Plan, the exercise  price and vesting  schedule for options is determined by
the Compensation Committee of the Board, which was established to administer the
Plan. Generally, options vest over a three year period and will have an exercise
price not less than the fair  market  value of a share on the date the option is
granted or have a term greater than ten years.

The  Company  also has a Stock  Option  Plan  for  Non-Employee  Directors  (the
"Director Plan") which provides for the grant of options up to a total of 50,000
shares of Common Stock.  The Director Plan was approved by the  shareholders  on
April 27, 1995.  Directors receive an initial option to purchase 1,000 shares of
Common Stock,  with annual option grants to purchase 500 shares of Common Stock.
Options  under the  Director  Plan can be exercised at a price equal to the fair
market  value of the stock on the date of the grant  and are  fully  vested  and
immediately  exercisable on the date of grant. Each Director Plan option expires
on the  earlier  of (i) ten years  from the date of grant or (ii)  seven  months
after the Director's termination.


Information regarding the Company's stock option plans is summarized below:
<TABLE>
<CAPTION>

                                                                                                     Weighted Average
                                                                Available            Granted and     Option Price Per
                                                                for Grant            Outstanding          Share

<S>                                                            <C>                     <C>                <C>   
Balance, December 31, 1993                                        388,127                370,228          $18.70
  Granted                                                         (54,105)                54,105           17.82
  Exercised and awarded                                                --                   (701)          15.69
  Forfeited                                                        15,856                (15,856)          18.29
                                                                  -------               --------
Balance, December 31, 1994                                        349,878                407,776           18.60
  Additional shares authorized for grant                           50,000                     --            --
  Granted                                                        (275,480)               275,480           16.88
  Exercised and awarded                                                --                (32,026)          16.10
  Forfeited                                                        60,380                (60,380)          18.50
                                                                  -------               --------
Balance, December 31, 1995                                        184,778                590,850           17.94
  Additional shares authorized for grant                        1,241,138                     --            --
  Granted                                                      (1,565,272)             1,565,272           18.37
  Exercised and awarded                                                --                (37,320)          16.41
  Forfeited and cancelled                                         623,356               (623,356)          23.23
                                                                 --------              ---------
Balance, December 31, 1996                                        484,000              1,495,446          $16.22
</TABLE>


<TABLE>
<CAPTION>
Options Exercisable at December 31:


<C>                 <C>                    <C>   
1996                276,804                $17.97
1995                219,272                $18.31
1994                175,471                $17.73
</TABLE>


As described in Note 2, the Company  accounts  for stock  compensation  costs in
accordance  with the provisions of Accounting  Principles  Board Opinion No. 25,
"Accounting for Stock Issued to Employees."

                                      F-20

<PAGE>



Had compensation cost been determined based on the fair value at the grant dates
for awards under the Company's  stock plans in accordance with SFAS No. 123, the
net loss would have been increased by $2.3 million ($.09 per share) and $664,000
($.03 per share) in 1996 and 1995,  respectively.  As  required by SFAS No. 123,
the fair value of each option  grant is estimated on the date of grant using the
Black-Scholes option pricing model with the following  assumptions for 1996 and
1995: no historical  dividend  yield;  an expected life of 10 years;  historical
volatility of 45% and a risk-free  rate of return ranging from 5.5% to 7.7%. The
weighted-average  fair values of the options  granted  during 1996 and 1995 were
$6.93 and $6.44 per share, respectively.  The weighted-average contractual lives
of the options  outstanding at December 31, 1996, was 8.7 years, and the options
vested at December  31, 1996,  had a  weighted-average  contractual  life of 5.8
years.

6. INCOME TAXES
- ---------------

The Company  accounts for income taxes under the liability method as required in
the Statement of Financial  Accounting Standards No. 109, "Accounting for Income
Taxes." Under the liability method, deferred income taxes are recognized for the
tax consequences of "temporary  differences" by applying  enacted  statutory tax
laws and rates  applicable to future years to differences  between the financial
statement carrying amounts and the tax bases of existing assets and liabilities.
Under  this  method,  the effect on  deferred  taxes of a change in tax rates is
recognized in income in the period that includes the enactment  date.  Potential
tax benefits,  related to net operating losses and temporary  differences,  have
been  recorded as an asset,  and a valuation  allowance  for the same amount has
been established. The Company has paid no income taxes since inception.


<TABLE>
<CAPTION>
The following is a summary of the Company's net deferred tax assets.

                                                               December 31
(in thousands)                                             1996           1995

<S>                                                     <C>              <C>    
Net Operating Loss for Income Tax Purposes               170,710        $40,358
Deferred Taxes Related to Temporary Differences:
  Tangible asset bases, lives and depreciation methods   (64,889)       (16,997)
  Other                                                    6,229          3,578
                                                          ------         -------
Total deferred tax asset                                 112,050         26,939
Less valuation allowance                                (112,050)       (26,939)
                                                        ---------       --------
Net deferred tax asset                                  $     --        $    --
                                                        =========       ========
</TABLE>


Significant  timing  differences  affecting  deferred  taxes  in 1996  were  the
treatment of costs  associated  with the Space Segment for  financial  reporting
purposes compared to tax purposes.  As of December 31, 1996, the Company had net
operating  loss  carryforwards  ("NOLs") of $424.7  million.  The NOLs expire in
years  2004  through  2011.  These NOL  carryforwards  are  subject  to  certain
limitations  if there is determined  to be a substantial  change in ownership as
defined in the Internal Revenue Code.


7. LONG-TERM DEBT
- -----------------
<TABLE>
<CAPTION>


                                                              December 31
<S>                                                  <C>              <C> 
(in thousands)                                           1996             1995

Term Loan Facility                                    $127,000        $     ---
Launch Services Financing                                  ---           40,000
Deferred Payment Agreement                               5,180           14,196
Equipment Financing Agreement                              ---            6,874
Term Loan Agreement                                      5,933            6,794
                                                         -----            -----
                                                       138,113           67,864
Less current maturities                                 11,113           67,864
                                                        ------           ------
Long-term debt                                        $127,000        $     ---
                                                      ========        =========


</TABLE>


                                      F-21

<PAGE>




Bank Financing - Term Loan and Working Capital Facility
- -------------------------------------------------------

To  satisfy  its  ongoing  financing  needs,  the  Company,  on June  28,  1996,
established a $225 million debt facility with Morgan  Guaranty Trust Company and
Toronto Dominion Bank (the "Bank Financing") consisting of two facilities: (i) a
$150 million five-year, multi-draw term loan facility (the "Term Loan Facility")
with quarterly payments commencing March 31, 1999 through and including June 30,
2001 and (ii) a $75 million  five-year  revolving  credit facility with a bullet
maturity on June 30, 2001 (the "Working Capital  Facility").  As a result of the
receipt of insurance  proceeds in excess of $60.0 million (see below),  the Bank
Financing  was  subsequently  reduced to $219  million.  Proceeds  from the Bank
Financing were used to repay the Interim Financing and the Short-Term Notes (see
Note 7) and to refinance  short-term Vendor  Financing,  and for general working
capital  purposes.  As of March 20,  1997,  the  Company  had drawn down  $144.0
million of the Term Loan  Facility  at an annual  interest  rate of 5.8125%  and
$18.0 million of the Working  Capital  Facility at annual interest rates ranging
from 5.6875% to 5.8125%.  The Company  concluded  that it could not complete the
Bank   Financing   without   substantial   credit  support  from  its  principal
stockholders (the "Guarantees"). HEC, Singapore and Baron Capital Partners, L.P.
(the "Guarantors") guaranteed $200 million of the Bank Financing in exchange for
compensation  consisting  principally of cash fees and warrants (the  "Guarantee
Warrants"),  allowing  the  Guarantors  to  purchase  5  million  shares  of the
Company's Common Stock at a price of $24 per share.  Under the terms of the Bank
Financing and the Guarantee  Agreement,  borrowings under the Bank Financing are
contingent  upon the  satisfaction by the Company of certain  performance  tests
relating  to net  revenues,  number  of  subscribers,  operating  cash  flow and
earnings before interest, taxes,  depreciation and amortization.  Because of the
slower than anticipated build-up of subscribers and related revenues, during the
third  and  fourth  quarters  of  1996,  the  Company  did not meet all of these
performance  tests and  required,  and  obtained,  waivers  from the  Guarantors
permitting  the Company to borrow up to $155 million  under the Bank  Financing.
The  Company  subsequently  received an  additional  waiver to borrow up to $162
million under the Bank Financing.

On March  27,  1997,  the  Company  reached  agreement  with the  Guarantors  to
eliminate  the  performance   tests  which  must  be  satisfied  for  subsequent
borrowings.  In  consideration  for this agreement,  the Company agreed with the
Guarantors  to reduce the exercise  price of the  Guarantee  Warrants to $13 per
share and to issue  additional  warrants to the  Guarantors  relating to 500,000
shares at the reduced  exercise price.  The Guarantee  Warrants,  at the date of
original  issuance,  were valued at $19.0 million;  the Guarantee  Warrants,  as
modified,  have not yet been formally valued.  The Guarantee  Warrants expire on
June 28,  2001.  The  revised  Guarantee  Agreement  places  limitations  on the
quarterly borrowings which the Company can make under the line as follows:  $170
million, $180 million, $190 million and $200 million in the first, second, third
and fourth  quarters of 1997,  respectively.  The Company  would  continue to be
subject to maintaining certain subscriber, revenue and debt to subscriber ratios
if the Guarantees are released.  Additionally, the Bank Financing places certain
restrictions  on the Company's  ability to pay  dividends,  other  indebtedness,
transactions  with affiliates,  and the acquisition of capital assets.  The Bank
Financing  is secured by the  pledge of  substantially  all of the assets of the
Company and certain of its subsidiaries.

The Company may need  additional  financing  in 1997 beyond the Bank  Financing.
There can be no assurance  that if additional  financing is required,  that such
financing  will be available or that the terms  thereof will be favorable to the
Company.  If the Bank  Financing  is not  sufficient,  the  Company may not have
adequate capital to fund its future operations.

                                      F-22

<PAGE>



Additionally, the Company incurred $15.3 million of bank financing costs related
to the placement of the Term Loan and Working  Capital  Facility and Guarantees.
Such costs have been  capitalized  and  reflected as Deferred  Charges and Other
Assets in the accompanying balance sheets.

Notes Payable to Bank - Launch Services Financing
- -------------------------------------------------

In 1992, the Company signed a contract with General Dynamics  Commercial  Launch
Services Inc.  ("GDCLS"),  to provide an Atlas IIA launch vehicle and associated
services,  including a combination  launch  service and satellite  risk coverage
package for up to $250 million, for the launch of AMSC-1. In connection with the
launch services contract (the "Contract") with Martin Marietta Commercial Launch
Services,  Inc. ("MMCLS") (as assignee of GDCLS), AMSC Subsidiary entered into a
$54.2 million revolving credit and term loan facility ("Credit  Agreement") with
a  syndicate  of banks to  partially  finance  the cost of the launch  services.
Borrowings  under the Credit  Agreement  are subject to periodic  interest  rate
adjustments  at either LIBOR plus .75% or the higher of a  participating  bank's
reference  rate or .5% above the Federal  Funds rate.  As of December  31, 1995,
$40.0 million had been borrowed and was outstanding under this arrangement at an
annual  interest rate of 6.75%.  The Company made payments in 1995 to reduce the
outstanding  principal  amount under the Credit  Agreement  to $40.0  million in
accordance  with the terms of the  Credit  Agreement.  Principal  repayments  on
outstanding borrowings commenced on March 29, 1996 and quarterly thereafter with
any outstanding balance due in full on June 30, 2001. As the Company anticipated
that it would be in violation of certain  financial  covenants  under the Credit
Agreement,  the outstanding  balance was repaid in full on September 30,1996. As
of  December  31,  1996,  no  amounts  remained  outstanding  or  available  for
borrowing.

Deferred Payment Agreement
- --------------------------

In 1992, the Company entered into a contract ("CGS Contract") with  Westinghouse
Electric  Corporation   ("Westinghouse")  pursuant  to  which  Westinghouse  was
responsible for designing and constructing the Ground Segment and developing the
final specification for mobile telephones.  In connection with the CGS Contract,
Westinghouse agreed to defer payment,  including interest thereon, under certain
terms and  conditions,  for the basic  purchase  price and for change orders and
options elected by the Company (the "Deferred Payment Agreement").

Since 1992,  the  Deferred  Payment  Agreement  has been  amended on occasion to
reflect, among other things, (i) for 1994, the waiver by Westinghouse of certain
obligations  and rights under the Deferred  Payment  Agreement in exchange for a
$5.0 million  prepayment,  (ii) for 1995, the waiver by  Westinghouse  of unpaid
interest of $1.4 million in exchange for a $10.0 million  prepayment,  (iii) for
1995, in exchange for the Company's  agreement to repay in full by September 30,
1996 all amounts due under the Deferred Payment Agreement,  Westinghouse  agreed
to waive all  current and future  interest  charges  and  obligations  and defer
AMSC's  compliance  with certain  financial  covenants to September 30, 1996 and
(iv) for 1995, an amendment to the Deferred  Payment  Agreement to reflect final
acceptance of the Ground Segment in October 1995.  During 1996, the Company made
repayments  in the amount of $9.4  million  and in  September  1996  arranged to
further defer repayment of the balance of amounts due under the Deferred Payment
Agreement until 1997 in exchange for interest on the outstanding  balance. As of
December 31, 1996, $5.2 million remained  outstanding at an annual interest rate
of 12%.

The effect of the above  amendments is that (i) repayment of  obligations  would
commence on January 31, 1996 with quarterly payments  thereafter until September
30, 1996,  when all  remaining  amounts  were  deferred  until 1997,  and (ii) a
reduction  in the cost of the Ground  Segment of $ 1.4  million  reflecting  the
contractor's  adjustment  of the  contracted  cost.  At December 31,  1996,  all
amounts under the Deferred Payment  Obligation were reflected as current portion
of long-term debt in the accompanying balance sheet, and no additional financing
was available under the Deferred Payment Agreement.

While  Westinghouse  committed to defer such amounts,  its  commitment  has been
reduced,  as permitted  in the  Deferred  Payment  Agreement,  by the  financing
provided by Digital Equipment  Corporation  ("DEC") and Northern Telecom Finance
Corporation ("Northern Telecom"). The financing provided by DEC for

                                      F-23

<PAGE>



certain  Ground  Segment  equipment has been accounted for as a capital lease in
the accompanying  financial  statements (see Note 9). The Company entered into a
Term Loan Agreement (the "Loan  Agreement") with Northern Telecom to finance the
purchase of certain  equipment to be used in the Ground  Segment.  As amended in
1994,  the Loan Agreement  provided for principal  borrowings up to $7.5 million
plus $1.1  million  for accrued  interest.  Amounts  outstanding  under the Loan
Agreement  bore interest at a floating rate of LIBOR plus 4.5% per annum through
September  1996 and were to be  repaid  over 5 years  commencing  in the  second
quarter of 1995. In September 1996, the Company  arranged to reduce the interest
rate to a floating rate of LIBOR plus 2.5% through maturity and to further defer
amounts due under the Loan  Agreement to 1997.  As of December  31,  1996,  $5.9
million was  outstanding  at an annual  interest rate of 7.94%,  and all amounts
borrowed  under the Loan Agreement  were  classified as current  portion of long
term debt in the accompanying balance sheet.


Equipment Financing to Related Party
- ------------------------------------

The Company entered into a contract to purchase from Hughes Network Systems Ltd.
("HNS Ltd."),  an affiliate of Hughes,  $9.1 million of certain  equipment to be
used with its Mobile Data  Communications  Service  products.  In addition,  the
Company  purchased  from HNS  Ltd.,  on behalf  of an AMSC  customer,  equipment
aggregating $5.2 million, with such amounts passed through to AMSC's customer at
acceptance.  Equipment  purchases  were fully financed by HNS Ltd. at LIBOR plus
150 basis points, with interest payable quarterly. Principal amounts outstanding
under this  arrangement were due in full on December 31, 1996. Final payment was
made on December  17,  1996 and as of December  31,  1996,  no amounts  remained
outstanding or available for borrowing.

Interim Financing and Short-Term Notes
- --------------------------------------

The Company  commenced  borrowings  under the Interim  Financing  on January 24,
1996, and had borrowed the full $40.0 million  available  under that facility at
April 4, 1996.  The terms of the Interim  Financing  were amended in  connection
with HEC's guaranty of that  facility.  As amended,  the Interim  Financing bore
interest at an annual rate  increasing from 11% to 15% until April 18, 1996, and
at an annual  rate of 5.75%  thereafter.  The  Interim  Financing,  as  amended,
matured  and was  repaid on July 1, 1996.  Additionally,  the  lenders  received
100,000 warrants (the "Interim Financing  Warrants"),  valued at $2.2 million at
date of issue,  that allow them to purchase Common Stock at $.01 per share.  The
Interim Financing Warrants expire in January 2001.

The  Company on April 22 and on June 12,  1996  issued  Short-Term  Notes in the
aggregate principal amount of $30.0 million.  The Short-Term Notes bore interest
at annual  rates  ranging from 5.6% to 5.7%,  and, as amended,  matured and were
repaid on July 1, 1996. See Note 1.

The  Company  incurred  interest  costs of  approximately  $15.1  million,  $5.6
million,  and $3.5 million in 1996, 1995, and 1994,  respectively.  All interest
costs incurred in 1994, and through  September 30, 1995 were capitalized as part
of the Company's  construction  activities.  The  capitalization of interest was
discontinued  in the fourth  quarter of 1995 when the SKYCELL  System was deemed
substantially  complete and ready for its intended use.  Interest cost paid, net
of amounts capitalized,  was $ 327,000 in 1995. Interest costs incurred prior to
1992 were expensed.

Assets Pledged and Secured
- --------------------------

All of the Company's assets at December 31, 1996 are pledged as collateral under
its various  financing  agreements.  At December 31, 1996 AMSC  Subsidiary's net
assets of  approximately  $178.0 million were restricted  under the terms of its
financing agreements.

Covenants
- ---------

The debt agreements and related Guarantee Agreements entered into by the Company
contain various restrictions,  covenants, defaults, and requirements customarily
found in such financing agreements.  Among other restrictions,  these provisions
include limitations on cash dividends, restrictions on transactions between AMSC
and its  subsidiaries,  restrictions on capital  acquisitions,  material adverse
change clauses, and maintenance of specified insurance policies. The Company did
not expect to be in compliance with certain financial  covenants of its existing
Vendor Financing agreements, and the Company has received waivers and amendments
for these  covenants  for the  period up to and  including  December  31,  1996.
Additionally, the Company was not in compliance with certain Guarantor covenants
for the period  ended  December  31,  1996.  The  Company  received  waivers and
amendments for these  covenants for the period up to and including  December 31,
1996.




                                      F-24

<PAGE>


8. RELATED PARTIES
- ------------------

In 1990, following a competitive bid process,  AMSC signed contracts with Hughes
Aircraft,  the  parent  company  of  Hughes  Communications  Satellite  Services
("Hughes  Communications"),  an  AMSC  stockholder,  to  construct  AMSC-1  (the
"Satellite  Construction  Contract").  AMSC-1 is  designed  to have ten years of
in-orbit  useful  service.   The  contract  also  contains  flight   performance
incentives  payable  by the  Company  to  Hughes  Aircraft  if  AMSC-1  performs
according to the contract.  The total incentives  owed, if earned,  will be $7.1
million,  plus  interest,  with payment  amounts  otherwise  due deferred  until
January 1998. The costs of the incentives are  capitalized in the period earned.
The Company also in 1990 selected HNS Ltd., an affiliate of Hughes Aircraft,  to
design,  manufacture,  and implement the  Company's  Mobile Data  Communications
Service.   In  1991,   the  Company   entered  into  an  agreement  with  Hughes
Communications to provide assistance in the launch services  procurement process
and certain other management services through the launch date. Additionally,  in
1996,  Hughes loaned the Company $10.0 million as part of its  participation  in
the Interim Financing.

The Company has entered into various transactions and agreements with affiliates
of AT&T Wireless  Services,  Inc. ("AT&T  Wireless"),  an AMSC stockholder.  The
arrangements  include the purchase by AMSC of certain  equipment  for use in the
SKYCELL System,  the leasing of certain office equipment,  and the engagement of
AT&T  to be one of the  Company's  long-distance  providers.  Additionally,  the
Company sublet certain office space to AT&T Wireless through September 1996. The
following table represents a summary of all related party transactions.

<TABLE>
<CAPTION>

                                                                      Years Ended December 31
<S>                                                    <C>                  <C>                <C> 
(in thousands)                                             1996                1995                1994

Payments made to (from) related parties:
Additions to property under construction                 $  ---              $3,029              $1,749
Additions to property and equipment in service            2,847                 265               3,731
Proceeds from debt issuance                             (10,000)                ---                 ---
Payments on debt obligations                             20,926                 251              27,797
Payment for Guarantees                                    3,000                 ---                 ---
Operating expenses                                        3,817               1,453                 ---
Sublease income                                            (205)               (239)               (228)
Loan to officer                                             ---                 ---                (200)
Collection of loan to officer                               ---                 ---                 200
Other                                                       ---                (506)                ---
                                                        -------             -------            -------- 
Net payments to related parties                         $20,385              $4,253             $33,049
                                                        =======              ======             =======

Due to (from) related parties:
Mobile Data Communications Service Financing             $  ---              $7,180             $   ---
Capital leases                                              446                 631                 ---
Operating expenses                                          185                 708                 ---
Capital acquisitions                                      1,584               1,924               1,247
Other                                                       ---                 ---                (506)
                                                         ------             -------              ------ 
Net amounts due to related parties                       $2,215             $10,443                $741
                                                         ======             =======              ======
</TABLE>



                                      F-25

<PAGE>



9. LEASES
- ---------

Capital Leases
- --------------

The Company leases certain office  equipment and Ground Segment  equipment under
agreements accounted for as capital leases. Assets recorded as capital leases in
the accompanying balance sheets include the following:
<TABLE>
<CAPTION>


                                                            December 31
<S>                                                      <C>           <C> 
(in thousands)                                            1996          1995

Ground Segment equipment                                 $7,263        $7,263
Office equipment                                          4,088         2,137
Less accumulated amortization                             2,826           877
                                                          -----           ---

Total                                                    $8,525        $8,523
                                                         ======        ======

</TABLE>

Amortization of the Ground Segment equipment began with the commencement of full
commercial service in December 1995.

In January 1996, the Company  refinanced  certain computer  hardware  components
under a sale/leaseback arrangement.  The Company received proceeds in the amount
of $1.7 million.  The transaction was accounted for as a financing,  wherein the
property  remains on the books and  continues  to be  depreciated.  A  financing
obligation  representing  the proceeds  was  recorded,  and is reduced  based on
payments under the lease. The sale/leaseback has a three-year term.

Operating Leases
- ----------------

The Company leases certain facilities and equipment under arrangements accounted
for as operating leases.  Certain of these  arrangements have renewal terms. The
office lease has an original  lease term of ten years  expiring in 2003,  with a
renewal option, and escalation clauses.  Total rent expense, under all operating
leases,  approximated  $2.5 million,  $10.6  million,  and $6.9 million in 1996,
1995, and 1994, respectively.

At  December  31,  1996,  minimum  future  lease  payments  under  noncancelable
operating and capital leases are as follows:
<TABLE>
<CAPTION>

                                                    Operating           Capital
(in thousands)                                       Leases             Leases

<C>                                                  <C>                <C>  
1997                                                   2,157              4,364
1998                                                   2,218              2,128
1999                                                   2,148                365
2000                                                   2,044                215
2001                                                   2,085                 --
2002 and thereafter                                    4,286                 --
                                                      ------            -------
Total                                                $14,938             $7,072
                                                     =======
Less - Interest                                                             584
                                                                         ------
Total obligation under capital leases                                    $6,488
                                                                         ======

</TABLE>


                                      F-26

<PAGE>





10. OPERATING AGREEMENTS AND COMMITMENTS
- ----------------------------------------

Joint Operating and Satellite Capacity Agreements
- -------------------------------------------------

The Company is party to a Joint  Operating  Agreement  and a Satellite  Capacity
Agreement  with a Canadian  entity,  TMI  Communications  and  Company,  Limited
Partnership,  under which the parties would use their best efforts to construct,
launch, and operate compatible satellites.  The parties to these agreements will
provide,  among other  things,  emergency  backup and restoral  services to each
other  during  any  period in which the  other's  satellite  is not  functioning
properly.  Additionally,  each party will be entitled to lease  excess  capacity
from the other party's  satellite  under  specified  terms and  conditions.  The
implementation of these agreements requires regulatory  approvals by the FCC and
Industry  Canada  (formerly  Canada's  Department of Industry and Science).  The
Company has  received,  and expects to continue to seek  approvals  contemplated
under these agreements on a timely basis.

Commitments
- -----------

At December 31,  1996,  the Company had  remaining  contractual  commitments  to
purchase both mobile data  terminal  inventory  and mobile  telephone  inventory
approximating $28.6 million and capital expenditure commitments of approximately
$387,000.

The  aggregate  fixed and  determinable  portion of all  inventory  commitments,
capital  expenditure  commitments  and obligations for other fixed contracts for
the next five years is as follows.

<TABLE>
<CAPTION>

(in thousands)

<C>                                                       <C>    
1997                                                      $27,993
1998                                                        5,548
1999                                                        1,280
2000                                                          426
2001 and thereafter                                            --
                                                          -------
Total                                                     $35,247
                                                          =======

</TABLE>

Additionally, the Company may enter into additional commitments that may require
the purchase of mobile  telephone and mobile terminal  inventory in amounts that
could be material to the Company's financial condition.

11. EMPLOYEE BENEFITS
- ---------------------

Defined Contribution Plan
- -------------------------

The Company sponsors a 401(k) defined  contribution plan ("401(k) Savings Plan")
in which all employees can  participate.  Effective  January 1, 1995, the 401(k)
Savings Plan provides for a Company match of employee contributions, in the form
of Common  Stock,  limited to the fair  market  value of up to  one-half  of the
employee's  contribution not to exceed 6% of an employee's salary. The Company's
matching expense was $411,000 for 1996 and $329,000 for 1995.

Employee Stock Purchase Plan
- ----------------------------

In December 1993,  the Company  adopted the Employee Stock Purchase Plan ("Stock
Purchase Plan") to allow eligible  employees to purchase shares of the Company's
Common Stock at 85% of the lower of market value on the first and last  business
day of the six-month option period.  An aggregate of 39,366 and 30,877,and 9,690
shares of Common Stock were issued under the Stock Purchase Plan in 1996,  1995,
and 1994 respectively.
                                      F-27

<PAGE>


12.  BUSINESS ACQUISITION
- -------------------------

On November 22, 1996, the Company acquired the assets of Rockwell Collins,  Inc.
("Rockwell")   relating   to  its   Land   Transportation   Electronics   Mobile
Communications   Satellite  Service  business  (the  "Business")  through  which
Rockwell had sold mobile messaging hardware and services to commercial  trucking
fleets.  The assets of the Business  were  acquired  from  Rockwell  through the
assumption by the Company of the various  contracts and  obligations of Rockwell
relating to the Business;  no additional  direct payments were made or are to be
made under the terms of the Asset Sale Agreement, dated as of November 22, 1996.
The assets of the business  acquired from Rockwell include  tangible  equipment,
completed  inventory  and  future inventory  deliveries  which  will  be used in
connection  with  fulfilling the contracts transferred  with  the Business.  The
Company intends to continue such use in operating the Business.

The purchase  method of  accounting  for  business  combinations  was used.  The
operating   results  of  the  Business  have  been  included  in  the  Company's
consolidated   statements  of  loss  from  the  date  of  acquisition  and  were
insignificant  in 1996. The  Company's  preliminary  estimate of the fair  value
of  the assets acquired  was  $9.5  million and liabilities  assumed  was  $6.1 
million.  The fair  value  of  assets  acquired  in  excess  of  purchase price 
arising from the acquisition in the amount of $3.4  million  will be  amortized 
over five years  on  a  straight  line  basis.   

The pro forma results below (unaudited)  assume the acquisition  occurred at the
beginning of the year ended December 31, 1995 (dollars in thousands,  except per
share data).

<TABLE>
<CAPTION>

                                                             1996               1995

<S>                                                     <C>                 <C>    
Revenue                                                   $33,333            $23,600
Net Loss                                                $(148,434)          $(91,028)
Loss per share                                             $(5.93)            ($3.66)

</TABLE>

13. LEGAL AND REGULATORY AND OTHER MATTERS
- ------------------------------------------

Legal and Regulatory Matters
- ----------------------------

Like other mobile  service  providers in the  telecommunications  industry,  the
Company is subject to substantial domestic, foreign and international regulation
including  the need for  regulatory  approvals to both  complete and operate the
SKYCELL System and operate mobile data terminals and mobile telephones.

The  successful  operation  of the SKYCELL  System is  dependent  on a number of
factors,  including the amount of L-band  spectrum made available to the Company
pursuant  to  an  international  coordination  process.  The  United  States  is
currently  engaged in an  international  process of  coordinating  the Company's
access to the  spectrum  that the FCC has  assigned  to the  Company.  While the
Company  believes that  substantial  progress has been made in the  coordination
process and expects that the United  States  government  will be  successful  in
securing the necessary spectrum,  the process is not yet complete. The inability
of the United States  government  to secure  sufficient  spectrum  could have an
adverse effect on the Company's  financial  position,  results of operations and
cash flows.

The Company has the necessary regulatory  approvals,  some of which are pursuant
to special temporary authority, to commence full commercial revenue service. The
Company has filed  applications with the FCC and expects to file applications in
the future with respect to the operation of the SKYCELL System and certain types
of mobile data  terminals  and mobile  telephones.  Certain of its  applications
pertaining to future service have been opposed.  While the Company,  for various
reasons,  believes  that it will  receive the  necessary  approvals  on a timely
basis,  there can be no  assurance  that the requests  will be granted,  will be
granted  on a timely  basis or will be granted on  conditions  favorable  to the
Company.  Any significant  changes to  theapplications  resulting from the FCC's
review process or any significant delay in their approval could adversely affect
the Company's financial position, results of operations and cash flows.

                                      F-28

<PAGE>





The Company's  license  requires that it comply with a  construction  and launch
schedule specified by the FCC for each of the three authorized  satellites.  The
second  and  third  satellites  are not in  compliance  with  the  schedule  for
commencement of construction.  The Company has asked the FCC to grant extensions
of the deadlines for the second and third satellites. Certain of these extension
requests  have  been  opposed  by third  parties.  The FCC has not  acted on the
Company's  requests.  The FCC has the authority to revoke the authorizations for
the second and third  satellites and in connection  with such  revocation  could
exercise its authority to rescind the Company's  license.  The Company  believes
that the exercise of such authority to rescind the license is unlikely.

In 1992,  a former  director  of AMSC filed an  Amended  Complaint  against  the
Company alleging  violations of the Communications Act of 1934, as amended,  and
of the Sherman Act and breach of contract.  The suit seeks  damages for not less
than $100  million  trebled  under the  antitrust  laws plus  punitive  damages,
interest,  attorneys fees and costs. In mid-1992, the Company filed its response
denying all  allegations.  The Company's motion for summary  judgment,  filed on
March 31, 1994,  was denied on April 18,  1996.  The matter has now been set for
trial beginning December 1997. Management believes that the complaint is without
merit,  and the  ultimate  outcome of this  matter  will not be  material to the
Company's financial position, results of operations or cash flows.

In October 1996, a vendor filed a complaint  against the Company  concerning the
production of  approximately  7,500 mobile data terminals.  The Company resolved
its disagreement with the vendor in January 1997 without additional liability to
the  Company.  The suit was  withdrawn  in February  1997,  and  production  and
delivery of the remaining  7,500 mobile data  terminals is scheduled to commence
in March, 1997.

Other Matters
- -------------

As previously  reported,  the satellite  has, in the past,  experienced  certain
technological anomalies, most significantly with respect to its eastern beam. On
August 1,  1996,  the  Company  reached a  resolution  of the  claims  under its
satellite  insurance  contracts and policies and received proceeds in the amount
of $66.0  million  which were used to repay the  Working  Capital  Facility  and
portions of the Term Loan Facility and the Vendor Financing.  The carrying value
of the satellite was reduced by the net insurance proceeds,  which resulted in a
reduction of future depreciation charges beginning in the third quarter of 1996.
The satellite has not  experienced  any  anomalies  other than those  previously
reported,  however,  there  can be no  assurance  that  the  satellite  will not
experience  subsequent  anomalies  that could  adversely  impact  the  Company's
financial condition, results of operations and cash flows.



14. SUPPLEMENTAL CASH FLOW  INFORMATION
- --------------------------  -----------

<TABLE>
<CAPTION>
                                                                                     Years Ended December 31
<S>                                                                           <C>            <C>             <C> 
(in thousands)                                                                  1996           1995            1994

Noncash investing and financing activities:
Leased asset and related obligations                                            $284         $1,351          $2,436
Issuance of Common Stock purchase warrants                                    21,253            ---             ---
Issuance of Common Stock upon exercise of Common
  Stock purchase warrants                                                        845            ---             ---
Vendor Financing for property under construction                                 ---          7,561          10,229
Vendor Financing for property in service                                       2,440          4,560             ---
Issuance of Common Stock under the Defined Contribution Plan                     411            329             ---
Net assets acquired as a result of Business Acquisition (Note 12)              3,488            ---             ---

</TABLE>

                                      F-29

<PAGE>



QUARTERLY FINANCIAL DATA (unaudited)
- ------------------------------------
(dollars in thousands, except for share data)

<TABLE>
<CAPTION>

                                                 1996-quarters                                        1995-quarters
<S>                           <C>           <C>           <C>          <C>            <C>         <C>          <C>       <C>
                                 1st           2nd           3rd          4th           1st          2nd          3rd        4th
Revenues                       $4,369        $6,749        $7,405       $9,207        $1,854      $1,813        $2,057    $3,073
Operating expenses (1)         31,371        45,747        33,914       36,737         9,957      11,285        15,585    42,471
                              -------       -------       -------      -------        ------     -------       -------    ------
Loss from operations          (27,002)      (38,998)      (26,509)     (27,530)       (8,103)     (9,472)      (13,528)  (39,398)
Interest and other
 income (expense)              (2,875)       (4,511)       (3,493)      (3,720)        1,774       1,339         1,026      (555)
                               -------       -------       -------      -------        ------      ------        ------     -----
Net Loss                      (29,877)      (43,509)      (30,002)     (31,250)       (6,329)     (8,133)      (12,502)  (39,953)
Net loss per common
 share (2)                     $(1.20)       $(1.74)       $(1.20)      $(1.24)       $(0.26)     $(0.33)       $(0.50)   $(1.60)

Weighted-average common shares
outstanding during the period
         (000s)                24,995        25,012        25,065       25,092        24,808      24,899        24,941    24,947

Market price per share (3)
          High                 $33.25        $20.00        $17.50       $14.62        $20.75      $30.25        $28.25    $31.25
          Low                  $16.00        $15.00        $10.75        $9.25        $12.50      $18.78        $21.50    $19.00
</TABLE>


(1) Fourth  quarter  of 1995  includes  a charge of $7.0  million  for the costs
associated  with the  temporary  delay in the  delivery  of  certain  subscriber
equipment,  and the write-down of certain  assets of Mobile Data  Communications
Service, including inventory, to net realizable value.

(2) Loss  per  share  calculations  for each of the  quarters  are  based on the
weighted average number of shares  outstanding for each of the periods,  and the
sum of the quarters may not necessarily be equal to the full year loss per share
amount.

(3) The  Company's  Common  Stock is listed  under the symbol SKYC on the Nasdaq
National Market System. The Company's Common Stock was not publicly traded prior
to December 14, 1993.  The  quarterly  high and low sales price  represents  the
closing price in the Nasdaq  National  Market System.  The quotations  represent
inter-dealer quotations,  without retail markups, markdowns or commissions,  and
may not necessarily represent actual transactions.

                                      F-30

<PAGE>


Selected Financial Data
- -----------------------

Set forth  below is the  selected  financial  data for the  Company for the five
fiscal years ended December 31, 1996:

<TABLE>
<CAPTION>


(dollars in thousands, except for per share data)
                                                         1996            1995             1994          1993           1992

<S>                                                 <C>              <C>              <C>           <C>            <C> 
Revenues                                              $27,730          $8,797           $5,240          $852           $277
Net Loss                                            $(134,638)       $(66,917)        $(21,103)     $(25,180)      $(24,281)
Net Loss per Common Share                              $(5.38)         $(2.69)          $(0.86)       $(2.49)        $(2.71)
Dividends on Common Stock (1)                            None            None             None          None           None

Consolidated Balance Sheet Data:
Cash and Cash Equivalents                              $2,182          $8,865         $137,287      $243,060         $6,713
Property Under Construction                               ---             ---          263,505       204,740        121,804
Total Assets                                          350,173         398,351          448,674       460,382        146,823
Current Liabilities                                    57,669         104,772           37,251        36,309         16,256
Long-Term Obligations                                 133,804           6,052           59,879        56,703         37,745
Stockholders' Equity                                  158,700         287,527          351,544       367,370         92,822

</TABLE>

(1) The Company has paid no dividends on its Common  Stock since  inception  and
does not plan to pay dividends on its Common Stock in the foreseeable future. In
addition,  the payment of dividends is subject to restrictions described in Note
7 to the financial  statements  and  discussed in  Management's  Discussion  and
Analysis.


                                      F-31

<PAGE>

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
                    ----------------------------------------





To American Mobile Satellite Corporation

We have audited, in accordance with generally  accepted auditing  standards, the
consolidated  financial statements of American Mobile Satellite  Corporation and
Subsidiaries  (a  Delaware  corporation)  included  in this  Form 10-K and have
issued our report  thereon  dated  March 27,  1997. Our audits were made for the
purpose  of forming an  opinion  on the basic  financial  statements  taken as a
whole. The schedule listed in the index is the  responsibility  of the Company's
management  and is presented for purposes of complying  with the  Securities and
Exchange  Commission's rules and is not part of the basic financial  statements.
The schedule has been subjected to the auditing procedures applied in the audits
of the basic  financial  statements  and, in our opinion,  fairly  states in all
material  respects  the  financial  data  required  to be set forth  therein  in
relation to the basic financial statements taken as a whole.





Washington, D.C.,
March 27, 1997

                                       S-1

<PAGE>



                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION
                      -------------------------------------

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                  ---------------------------------------------
                              (Parent Company Only)

                            Condensed Balance Sheets
<TABLE>
<CAPTION>


                                                                                    December 31,
<S>                                                                         <C>                   <C> 
                                                                              1996                  1995
                                                                             (in thousands of dollars)



                           ASSETS

Investment in and amounts due from wholly-owned subsidiaries                 $158,713             $287,527
                                                                            ---------             --------

         Total assets                                                        $158,713             $287,527
                                                                             ========             ========


         LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses                                             $13             $    --

Stockholders' Equity
         Preferred Stock                                                           --                  --
         Common Stock                                                             251                  250 
         Additional paid-in capital                                           451,259              448,757
         Common stock purchase warrants                                        23,848                3,440
         Unamortized stock purchase warrants                                  (17,100)                 --
         Accumulated loss                                                    (299,558)            (164,920)
                                                                             ---------            ---------
                  Total Stockholders' Equity                                 $158,700             $287,527
                                                                             --------             --------

                  Total Liabilities and Stockholders' Equity                 $158,713             $287,527
                                                                             ========             ========

</TABLE>


                                       S-2

<PAGE>



                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION
                      -------------------------------------

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                  ---------------------------------------------
                              (Parent Company Only)

                          Condensed Statements of Loss
<TABLE>
<CAPTION>

                                                                           For the Years Ended December 31,
<S>                                                                 <C>               <C>                 <C> 
                                                                         1996             1995                1994

Revenues
         Mgmt fees from wholly-owned subsidiary                        $1,200           $1,200              $1,200

Operating Expenses
         Engineering operations                                            --               87                 158
         Sales and marketing                                               --               91                  91
         General and administrative                                     2,452              595                 439
                                                                        -----            -----                ----
           Total operating expenses                                     2,452              773                 688

(Loss) income from operations                                          (1,252)             427                 512

Interest income                                                            --            3,258               7,524
Interest expense                                                       (1,900)              --                  --
                                                                       -------          ------             -------

(Loss) income before Net loss of AMSC SUB                              (3,152)           3,685               8,036

         Net loss of AMSC SUB -- Note A                              (131,486)         (70,602)            (29,139)
                                                                     ---------         --------            --------

Net Loss                                                            $(134,638)        $(66,917)           $(21,103)
                                                                    ==========        =========           =========
</TABLE>

                                       S-3

<PAGE>



                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION
                      -------------------------------------

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                  ---------------------------------------------
                              (Parent Company Only)

                       Condensed Statements of Cash Flows
<TABLE>
<CAPTION>

                                                                           For the Years Ended December 31,
                                                                       1996             1995              1994

<S>                                                                <C>              <C>               <C>   
Cash Provided From Operating Activities                              $1,424           $5,067            $7,151

Investing Activities:
  Advances to and investment in subsidiaries                         (2,672)        (162,778)          (68,833)
  Sales (Purchases) of short-term investments-net                        --           28,717           (28,717)
                                                                   ---------        ---------         ---------
Cash (Used in) Investing Activities                                  (2,672)        (134,061)          (97,550)

Financing Activities:
  Proceeds from sale of Common Stock                                  1,248            2,569             5,277
  Repayment of Convertible Subordinated Notes                            --               --           (27,667)
                                                                   ---------        ---------         ---------
Cash Provided by (Used in) Financing Activities                       1,248            2,569           (22,390)

Decrease for the period                                                  --         (126,425)         (112,789)
Beginning of period                                                      --          126,425           239,214
                                                                   ---------        ---------          --------
End of period                                                      $     --         $     --          $126,425
                                                                    ========         =======          ========

</TABLE>


                                       S-4

<PAGE>



                                                                      SCHEDULE I

                      AMERICAN MOBILE SATELLITE CORPORATION
                      -------------------------------------

                  CONDENSED FINANCIAL INFORMATION OF REGISTRANT
                  ---------------------------------------------
                              (Parent Company Only)

                     Notes to Condensed Financial Statements

Note A -- Background and Basis of Presentation

         American Mobile Satellite  Corporation was incorporated on May 3, 1988,
by eight of the initial  applicants for the mobile satellite  services  license,
following a determination by the Federal  Communications Commission ("FCC") that
the public interest would be best served by granting the license to a consortium
of all willing,  qualified  applicants.  The FCC has authorized  American Mobile
Satellite  Corporation  to  construct,  launch,  and operate a mobile  satellite
services  system (the "SKYCELL  System") to provide a full range of mobile voice
and data  services via  satellite to land,  air,  and  sea-based  customers in a
service area consisting of the continental United States, Alaska, Hawaii, Puerto
Rico, the U.S. Virgin Islands,  U.S.  coastal waters,  international  waters and
airspace and any foreign territory where the local government has authorized the
provision  of service.  In March 1991,  American  Mobile  Satellite  Corporation
transferred the mobile  satellite  services  license ("MSS license") to a wholly
owned  subsidiary,  AMSC  Subsidiary  Corporation  (AMSC SUB").  American Mobile
Satellite Corporation has six other subsidiaries,  two of which are inactive and
four whose limited activities do not require material resources at this time.

         In  the  parent  Company-only   financial  statements,   the  Company's
investment  in  subsidiaries  is stated at cost less losses of AMSC SUB. The net
loss of AMSC SUB is  included  in these  financial  statements  using the equity
method. The Company has entered into various  transactions with its wholly-owned
subsidiaries. These transactions are eliminated in the audited consolidated 
financial statements and are summarized as follows:
<TABLE>
<CAPTION>

                                                          1996             1995              1994
                                                          ----             ----              ----
                                                                     (in thousands of dollars)
<S>                                                     <C>              <C>               <C>     
Investment in and amounts due from wholly-owned
         subsidiaries                                   $158,713         $287,527          $195,351
Management fees                                            1,200            1,200             1,200
Interest income                                           29,485           23,445             9,548
</TABLE>

         Parent company-only  financial statements should be read in conjunction
with the Company's consolidated financial statements.



                                       S-5

<PAGE>




Note B -- Investment in AMSC SUB

         As stated in Note A, the Company  records its investment in AMSC SUB on
the equity method. The recoverability of such investment is subject to the risks
associated with the  development of  establishing a new business.  Specifically,
future  operating  results of AMSC SUB will be subject to significant  business,
economic, regulatory, technical and competitive uncertainties and contingencies.
Additionally, adequate liquidity and capital are critical to the ability of AMSC
SUB to continue as a going concern.

         AMSC SUB, in January  1996,  entered  into a $40.0  million bank credit
facility (the "Interim Financing"). The lenders received warrants to purchase an
aggregate of 100,000  shares of Common  Stock at $.01 per share.  To satisfy its
ongoing  financing  needs,  the Company,  on June 23, 1996,  established  a $225
million debt facility with Morgan  Guaranty  Trust Company and Toronto  Dominion
Bank (the "Bank  Financing")  consisting of two  facilities:  (i) a $150 million
five-year,  multi-draw  term loan  facility  (the  "Term  Loan  Facility")  with
quarterly  payments  commencing March 31, 1999 through June 30, 2001, and (ii) a
$75 million  five-year  revolving credit facility with a bullet maturity on June
30, 2001 (the "Working Capital  Facility").  The Company concluded that it could
not complete the Bank  Financing  without  substantial  credit  support from its
principal  stockholders  (the  "Guarantees").   Hughes  Electronics  Corporation
("HEC"),  Singapore  Telecommunications,  Ltd.  ("Singapore") and Baron Capital,
L.P.  (the  "Guarantors")  guaranteed  $200 million of the Bank  Financing  (the
"Guarantee  Agreement") in exchange for compensation  consisting  principally of
cash fees and warrants (the "Guarantee Warrants").  The Guarantee Warrants allow
the Guarantors to purchase 5 million  shares of the Company's  Common Stock at a
price of $24 per share.

Because of the slower  than  anticipated  build-up  of  subscribers  and related
revenues, during the third and fourth quarters of 1996, the Company did not meet
all of the performance  tests required to obtain certain  borrowing levels under
the Guarantee Agreement and required, and obtained,  waivers from the Guarantors
permitting  the Company to borrow up to $155 million  under the Bank  Financing.
The Company  subsequently  received an additional  waiver from the Guarantors to
borrow up to $162  million  under the Bank  Financing.  On March 27,  1997,  the
Company reached agreement with the Guarantors to eliminate the performance tests
which must be satisfied for subsequent  borrowings.  In  consideration  for this
agreement,  the Company  agreed with the Guarantors to reduce the exercise price
of the Guarantee  Warrants to $13 per share and to issue additional  warrants to
the Guarantors  relating to 500,000 shares at the reduced  exercise  price.  The
Guarantee  Warrants,  at the date of  original  issuance,  were  valued at $19.0
million; the Guarantee Warrants, as modified, have not yet been formally valued.
The Guarantee Warrants expire on June 28, 2001.



                                       S-6

<PAGE>


Note C -- Guarantee

         The Company  has  guaranteed  various  obligations  of AMSC SUB.  These
guaranteed obligations include amounts borrowed under AMSC SUB's Bank Financing,
ground segment financing  agreements and obligations of AMSC SUB under an office
lease agreement.


Note D -- Legal Matters

In 1992, a former director of the Company filed an Amended Complaint against the
Company alleging  violations of the Communications Act of 1934, as amended,  and
the Sherman Act and breach of contract. The suit seeks damages for not less than
$100 million trebled under the antitrust laws plus punitive  damages,  interest,
attorney's fees and costs.  In mid 1992, the Company filed its response  denying
all allegations.  The Company's motion for summary judgment,  filed on March 31,
1994,  was  denied  on April 18,  1996.  The  matter  has now been set for trial
beginning  December,  1997.  Management  believes  that the complaint is without
merit,  and the  ultimate  outcome of this  matter  will not be  material to the
Company's financial condition, results of operations or cash flows.

                                       S-7

<PAGE>





American Mobile Satellite Corporation
10802 Parkridge Blvd.
Reston, VA
20191-5416





February 13, 1997


James M. Kohosek
Vice President and Chief Financial Officer
Westinghouse Wireless Solutions Company
930 International Drive
Linthicum, Maryland  21090

Dear Mr. Kohosek:

         Reference  is  made  to the  Deferred  Payment  Agreement  dated  as of
September  15, 1992 between AMSC  Subsidiary  Corporation  (the  "Company")  and
Westinghouse Electric Corporation ("WEC"), as amended by (i) that certain letter
agreement  dated  October 1, 1992  between the  Company and WEC,  (ii) the First
Amendment to Deferred Payment Agreement dated as of February 2, 1993, (iii) that
certain  letter  agreement  dated  October 18, 1993 between the Company and WEC,
(iv) that certain letter  agreement  dated December 23, 1993 between the Company
and WEC, (v) that certain letter  agreement  dated February 25, 1994 between the
Company  and WEC,  (vi) that  certain  letter  agreement  dated  August 30, 1994
between the Company and WEC, (vii) that certain letter  agreement dated February
28,  1995,  between the Company and WEC,  (viii) that certain  letter  agreement
dated July 31,  1995,  between  the Company and WEC,  (ix) that  certain  letter
agreement  dated  September 11, 1995,  between the Company and WEC, and (x) that
certain  agreement  dated  October 13, 1995,  between the Company and WEC (as so
amended,  the  "Deferred  Payment  Agreement").  Unless  otherwise  specifically
provided herein,  capitalized terms used in this letter agreement shall have the
meanings given them in the Deferred Payment Agreement.

         This  letter  will  evidence  the  agreement  of the Company and WEC as
follows:

         1.  Notwithstanding  any provision of the Deferred Payment Agreement to
the contrary,  the parties agree that the remaining Deferred Payment Obligations
outstanding   on  the  date  hereof  shall  be  repaid  in  four  equal  monthly
installments of One Million Dollars ($1,000,000.00) each payable on the 15th day
of January,  February,  March and April  1997,  and a final  installment  of One
Million   One-Hundred   Eighty   Thousand   Three   Hundred   Eighteen   Dollars
($1,180,318.00)  payable on May 15, 1997, in each case together with interest on
such  installment  accruing at the rate of twelve  percent  (12%) per annum from
September 30, 1996 to the date of payment thereof.

         2.  The  Deferred  Payment  Agreement  is  hereby  amended  by  waiving
compliance with Sections 7.11 and 7.12 for the quarter ended December 31, 1996.



<PAGE>


James M. Kohosek
February 13, 1997
Page 2


         3. Except as expressly  provided above, the Deferred Payment  Agreement
is not  amended,  modified or waived  and, as amended by this letter  agreement,
shall remain in full force and effect.

         Please  indicate your  agreement  with the foregoing by executing  this
letter in the space provided below. This letter agreement will be effective upon
receipt by the Company of a fully executed counterpart of this letter.

Very truly yours,

AMSC SUBSIDIARY CORPORATION


By:      /s/RICHARD J. BURNHEIMER
         -------------------------------------------------
         Richard J. Burnheimer
         Vice President and Treasurer

AGREED TO AND ACCEPTED this 13th of February 1997.
                           -----

WESTINGHOUSE ELECTRIC CORPORATION


By:      /s/PATTY L. ARMACOST
         -------------------------------------------------


Its:     Director, Customer & Supplier Partnerships
         -------------------------------------------------







American Mobile Satellite Corporation
10802 Parkridge Blvd.
Reston, VA
20191-5416









March 11, 1997

James M. Kohosek
Vice President and Chief Financial Officer
Westinghouse Wireless Solutions Company
930 International Drive
Linthicum, Maryland  21090

Dear Mr. Kohosek:

         Reference  is  made  to the  Deferred  Payment  Agreement  dated  as of
September  15, 1992 between AMSC  Subsidiary  Corporation  (the  "Company")  and
Westinghouse Electric Corporation ("WEC"), as amended by (i) that certain letter
agreement  dated  October 1, 1992  between the  Company and WEC,  (ii) the First
Amendment to Deferred Payment Agreement dated as of February 2, 1993, (iii) that
certain  letter  agreement  dated  October 18, 1993 between the Company and WEC,
(iv) that certain letter  agreement  dated December 23, 1993 between the Company
and WEC, (v) that certain letter  agreement  dated February 25, 1994 between the
Company  and WEC,  (vi) that  certain  letter  agreement  dated  August 30, 1994
between the Company and WEC, (vii) that certain letter  agreement dated February
28,  1995,  between the Company and WEC,  (viii) that certain  letter  agreement
dated July 31,  1995,  between  the Company and WEC,  (ix) that  certain  letter
agreement  dated  September  11,  1995,  between the  Company and WEC,  (x) that
certain  agreement dated October 13, 1995,  between the Company and WEC and (xi)
that certain  agreement  dated February 13, 1997 between the Company and WEC (as
so amended,  the "Deferred Payment  Agreement").  Unless otherwise  specifically
provided herein,  capitalized terms used in this letter agreement shall have the
meanings given them in the Deferred Payment Agreement.

         This  letter  will  evidence  the  agreement  of the Company and WEC as
follows:

         1.  The  Deferred  Payment  Agreement  is  hereby  amended  by  waiving
compliance with Sections 7.11 and 7.12 for the quarter ended March 31, 1997.

         2. Except as expressly  provided above, the Deferred Payment  Agreement
is not  amended,  modified or waived  and, as amended by this letter  agreement,
shall remain in full force and effect.





<PAGE>


James M. Kohosek
March 11, 1997
Page 2


         Please  indicate your  agreement  with the foregoing by executing  this
letter in the space provided below. This letter agreement will be effective upon
receipt by the Company of a fully executed counterpart of this letter.

Very truly yours,

AMSC SUBSIDIARY CORPORATION


By:     /s/RICHARD J. BURNHEIMER
        -------------------------------------------------

        Richard J. Burnheimer
        Vice President and Treasurer

AGREED TO AND ACCEPTED this 12th day of March 1997.

WESTINGHOUSE ELECTRIC CORPORATION


By:     /s/PATTY L. ARMACOST
        -------------------------------------------------


Its:    Director, Customer & Supplier Partnerships
        -------------------------------------------------








                                                                  EXHIBIT 10.24b
                                   ADDENDUM #1
                                       To
                           VOLUME PURCHASING AGREEMENT
                                 By and Between
                           TRIMBLE NAVIGATION LIMITED
                                       AND
                           AMSC SUBSIDIARY CORPORATION

This  Addendum  No. 1,  executed  as of the 19th day of  December  1995  between
Trimble   Navigation  Limited   (hereinafter   "Trimble")  and  AMSC  Subsidiary
Corporation  (hereinafter  "AMSC"),  is  entered  into  pursuant  to the  Volume
Purchasing Agreement (VPA) entered into by the parties as of March 10, 1995.

Purpose of Addendum:  The purpose of this  Addendum No. 1 is to amend the VPA in
accordance  with terms and  conditions  agreed to during a meeting  held between
AMSC and Trimble on Tuesday,  21 November 1995 relative to the  rescheduling  of
"Production  Units," as defined in section 3.3 of the VPA. The VPA is amended as
set  forth  below.  Except  as set  forth  in this  Addendum  No.  1, the VPA is
unchanged.  Capitalized terms used in this Addendum No. 1 have the same meanings
as set forth in the VPA.

1.  Shutdown of production line:  Trimble will shut down its production line for
Production Units on November 27, 1995, subject to the following:

(a) AMSC  shall  compensate  Trimble  for the  costs of the  shutdown  by paying
Trimble an initial  monthly  charge  ("Shutdown  Fee") of Two  Hundred  Thousand
Dollars  ($200,000.00)  per month for the months of November and December  1995.
The Four Hundred Thousand Dollars  ($400,000.00)  total shall be paid to Trimble
when AMSC obtains sufficient draw down capacity on the $200M line of credit.

(b) AMSC will pay Trimble a reduced shutdown fee of One Hundred Thousand Dollars
($100,000.00) per month for any additional months of production shutdown.  It is
currently  anticipated  that the shutdown  will not extend beyond March 31, 1996
and Trimble will agree to finance a maximum of $300,000.00  from January 1, 1996
to March 31, 1996 at a 1% per month interest charge.  The resulting balance will
be paid on March 31, 1996 or when AMSC has sufficient  draw down capacity on the
$200M line of credit.

(c) Trimble  will  restart  the  production  line upon sixty (60) days'  written
notice from AMSC,  provided that the restart shall be only for quantities  equal
to or greater than Five Hundred (500) units per month.




                                      - 1 -

<PAGE>



2.  Rescheduling  of  deliveries:  In  consideration  of  costs  to  Trimble  of
rescheduling  the delivery of  Production  Units under this Addendum No. 1, AMSC
will  relinquish,  and Trimble  shall be entitled to retain,  the deposit of One
Million  Eighty  Thousand  Dollars  ($1,080,000.00)  that  was  paid to  Trimble
pursuant to section 8.3 of the VPA.

3. AMSC accounts  payable balance:  The parties agree that as of 12/08/95,  AMSC
owes Trimble the sum of One Million Seven Hundred  Thousand Three Hundred Thirty
Dollars  ($1,700,330.00).  Trimble  will finance the  $1,700,330.00  for product
previously shipped and invoiced from December 1, 1995 at a 1% per month interest
charge with a due date of March 31, 1996. There will be no pre-payment  penalty.
The  $1,700,330.00  balance  will be secured  by  security  agreement  and UCC-1
filing.

4.  Reductions in Production  Unit price:  The per-unit  price for the remainder
(approximately  2,500) of the initial 6,000 Production Units yet to be delivered
will be reduced from One Thousand Nine Hundred Thirty Dollars ($1,930.00) to One
Thousand Seven Hundred Fifteen Dollars  ($1,715.00),  and the per-unit price for
the  subsequent  6,000 units will be reduced from One Thousand Eight Hundred Ten
Dollars   ($1,810.00)   to  One  Thousand  Six  Hundred   Seventy  Five  Dollars
($1,675.00).  Notwithstanding  the  foregoing,  the  per-unit  price to AMSC for
Production  Units  to  be  provided  to  AMSC's  potential   customer  Transport
Communications,  Inc.  ("TCI")  shall be One Thousand  Six Hundred  Seventy Five
Dollars  ($1,675.00) per unit. Such Production Units shall be in addition to the
Initial Purchase Order of 12,000  Production  Units, as described in section 5.1
of the VPA.

5. Future  mobile  terminal  procurements:  AMSC agrees to procure  from Trimble
future  requirements  for the same or  similar  Standard  "C"  mobile  terminals
operating within AMSC's MMS System and with AMSC's MSAT satellite if the prices,
terms, and conditions of such  requirements are considered in AMSC's  reasonable
judgment to be competitive in the market place. Prior to awarding a contract for
future requirements, AMSC will conduct final discussions with Trimble.

6. Reporting:   AMSC will  provide the  following information on  a semi-monthly
and monthly basis:

    a)  Six month rolling forecasts of sales and installs.  (semi-monthly)
    b)  Progress toward the 7,500 unit activation threshold on MSAT.  (monthly)
    c)  Galaxy orders received to date.  (monthly)
    d)  Galaxy installations to date. (monthly)
    e)  Inventory of Galaxy units.  (semi-monthly)
    f)  Number of units incoming tested by AT&T.  (semi-monthly)
    g)  Galaxy failures at incoming test and in the field.  (semi-monthly)
    h)  Unit commissioning data.  (monthly)




                                      - 2 -

<PAGE>






     The parties by their  signatures  below hereby  acknowledge  and accept the
terms of this Addendum No. 1 to the VPA.  This  Addendum No. 1  constitutes  the
entire agreement of the parties on the subject matter hereof, and supersedes all
prior  negotiations,  discussions,  agreements,  or addenda,  whether written or
oral.

AMSC Subsidiary Corporation

By:

Title:  Vice President FCP Products




AMSC Subsidiary Corporation

By:

Title:  Vice President and General Counsel

Trimble Navigation Limited

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

Title:
      -------------------------





                                      - 3 -







                                                                  EXHIBIT 10.24c

Trimble
                                                      Trimble Navigation Limited
                                                           645 North Mary Avenue
                                                            Post Office Box 3642
                                                        Sunnyvale, CA 94038-3642
                                                                    408-481-6000
                                                                408-481-2000 Fax

                                   ADDENDUM #2


                                                              January 28, 1997

Mr. Gary Parsons
Chief Executive Officer
American Mobile Satellite Corporation
10802 Parkridge Blvd.
Reston, VA 22091

Dear Gary:

Our agreement for restarting the Galaxy production line is as follows:

1.  Trimble will restart  production  with  shipments to AMSC at the rate of 500
units per month,  sustaining this  production rate for the remaining  balance of
7,748 units in the existing Volume Purchasing Agreement (VPA).
Trimble will have the flexibility to ship units anytime within each month.

2.  Trimble will  use reasonable, best efforts  to ship  the first 500 units in 
March.  Any shortfall will be fulfilled as soon as possible.

3. AMSC will provide Trimble with a delivery order for the remaining 7,748 units
on, or before,  February 1, 1997.  Each month's order will be for 500 units with
the  exception of the last month which will be for 248 units.  AMSC will provide
Trimble  with a  prepayment  on, or  before,  February  15 for  1,000  units for
shipment in March and April.

4.  Starting in March,  and for each  succeeding  month for the  duration of the
agreement, AMSC will provide Trimble with a prepayment by the 15th of each month
for an additional month's shipment.

5. AMSC will make final  monthly  shutdown  payments  to Trimble of  $100,000 in
January and February to offset a portion of the costs associated with restarting
production.

6. The price for the first 1,748 units is $1,715.00  The price for the remaining
6,000 units is $1,675.00.

7. AMSC will  provide  Trimble  with  reports and other data as specified in the
VPA, and will use reasonable efforts to keep Trimble informed as to its business
as far as it pertains to this agreement.

8.       Trimble agrees to dismiss the pending lawsuit filed by Trimble against 
AMSC.

                                      

<PAGE>




With your  concurrence to the above,  this letter would become a second addendum
to the existing VPA and Addendum #1. The remaining terms of the VPA and Addendum
#1 would remain in force.

Upon completion of this agreement, Trimble will issue a press release related to
this agreement and communicating that we are restarting production of the Galaxy
unit for AMSC.

Very truly yours,
/s/TOM ELLIS
Tom Ellis
cc:  Jim Sorden

I have reviewed the terms set forth, and agree to such terms.

Signature /s/G.M.PARSONS     Date Jan. 29, 1997
Gary Parsons
Chief Executive Officer
American Mobile Satellite Corporation



                                     



                                    AGREEMENT


         THIS  AGREEMENT  dated as of  November  25, 1996 is made by and between
American Mobile Satellite  Corporation,  a Delaware corporation (the "Company"),
and [Name of Executive] (the "Executive").

         WHEREAS,  the Company  considers it essential to its best interests and
to the best interests of its stockholders to foster the continuous employment of
its key management personnel; and

         WHEREAS,  the Company  recognizes  that the  possibility of a Change in
Control  (as  defined  in  Section  9.4  hereof)  exists,  as in the case of any
publicly-held  corporation,  and that such possibility,  and the uncertainty and
questions  which it may raise among  management,  may result in the departure or
distraction  of  management  personnel  to the  detriment of the Company and its
stockholders; and

         WHEREAS,  the Company has determined that  appropriate  steps should be
taken to reinforce  and encourage  the  continued  attention  and  dedication of
members of the Company's management,  including the Executive, to their assigned
duties without distraction in the face of potentially  disturbing  circumstances
arising from the possibility of a Change in Control;

         NOW,  THEREFORE,  in  consideration  of the  premises  and  the  mutual
covenants  herein  contained,  the Company  and the  Executive  hereby  agree as
follows:

         1.  Defined Terms.  Definitions  of  certain  capitalized terms used in
             -------------- 
this Agreement are provided in Section 9 and elsewhere in this Agreement.

         2. Term of Agreement. This Agreement shall become effective on the date
            -----------------
hereof and shall remain in effect indefinitely  thereafter;  provided,  however,
that (a) except as provided in clause (b) of this  Section 2, either the Company
or the Executive may terminate this Agreement by giving the other party at least
one (1) year advance written notice of such termination,  and (b) if a Potential
Change in Control or a Change in Control shall have occurred  during the term of
this  Agreement,  this Agreement may not be terminated  until all obligations of
either party hereto have been performed in full, the Coverage Period has expired
without the  occurrence  of a  Triggering  Event,  or in the case of a Potential
Change in Control,  no Change in Control occurs for at least two years following
such Potential Change in Control.  Notwithstanding the foregoing, this Agreement
shall  terminate  upon  the  Executive's  attaining  age  sixty-five  (65),  the
Executive's  Disability  or  death,  except  as to  obligations  of the  Company
hereunder  arising from a Change in Control and a Triggering Event that occurred
prior  to his  having  reached  such  age or  prior  to  the  occurrence  of his
Disability or death.


         3. Agreement of the Company. In order to induce the Executive to remain
            ------------------------
in the employ of the Company, the Company agrees, under the terms and conditions
set forth herein,  that,  upon the  occurrence of both a Change in Control and a
Triggering Event during the term of this Agreement, the Company shall provide to
the  Executive  the  benefits  described  in Sections 3.1 through 3.3 below (the
"Severance  Benefits"),  unless prior to the date of any Triggering  Event,  the
Executive's  employment with the Company has been terminated for Cause or due to
the Executive's Disability or death.

                  3.1 Lump-Sum Severance Payment.  In lieu of any further salary
                      --------------------------
payments to the Executive for periods subsequent to the Date of Termination, the
Company  shall  pay to the  Executive  a lump sum  severance  payment,  in cash,
without discount, equal to the sum of (i) the Executive's Annual Base Salary and
(ii) the Executive's Average Bonus.

                  3.2 Vesting of Options. The vesting of all options to purchase
                      ------------------
securities  of the Company  granted to the  Executive  pursuant to the Company's
1989 Stock Option Plan,  as amended and restated  December 7, 1993, or any other
Company plan that are then held by the  Executive  shall be  accelerated  to the
later of the Date of  Termination  or six months  after the date such option was
granted, and shall continue to be exercisable for a  two-year period  after such


<PAGE>



acceleration;  any  provision  contained  in  the  agreement(s) under which such
options  were granted  that is  inconsistent  with  such  acceleration is hereby
modified  to  the  extent  necessary  to  provide  for such  acceleration;  such
acceleration  shall  not apply  to  any  option  that  by its terms  would  vest
prior to the date  provided  for in this Section 3.2.

                  3.3 Continued Benefits. For a twelve (12) month period (or, if
                      ------------------
less,  the  number of  months  from the Date of  Termination  until the date the
Executive  will reach age sixty-five  (65)) after the Date of  Termination  (the
"Benefits Period"), the Company shall provide the Executive with group term life
insurance,  health  insurance,   accident  and  long-term  disability  insurance
benefits  (collectively,   "Welfare  Benefits")  substantially  similar  in  all
respects to those that the Executive was receiving immediately prior to the Date
of  Termination  (without  giving  effect  to any  reduction  in  such  benefits
subsequent to a Potential Change in Control or a Change in Control).  During the
Benefits Period, the Executive shall be entitled to elect to change his level of
coverage and/or his choice of coverage options (such as Executive only or family
medical  coverage)  with  respect to the Welfare  Benefits to be provided by the
Company to the  Executive  to the same  extent  that  actively  employed  senior
executives of the Company are permitted to make such changes; provided, however,
that in the event of any such changes the Executive  shall pay the amount of any
cost  increase  that  would  actually  be paid by an  actively  employed  senior
executive  of the  Company by reason of making the same  changes in his level of
coverage or coverage options.

                  3.4  Terminations in  Anticipation  of Change in Control.  The
                       ---------------------------------------------------
Executive shall be entitled to the Severance  Benefits under Section 3 hereof if
the Executive's employment is terminated by the Company without Cause prior to a
Change in Control and such termination of employment (a) was at the request of a
third party which has taken steps  reasonably  calculated  to effect a Change in
Control or (b)  otherwise  arose in  anticipation  of a Change in  Control.  The
Executive shall be entitled to the Severance  Benefits under Section 3 hereof if
the Executive  terminates his employment  prior to a Change in Control if at the
time of such  termination a circumstance  or event which would  constitute  Good
Reason  after a Change in Control  has  occurred  (a) at the  request of a third
party who has taken steps reasonably calculated to effect a Change in Control or
(b) in anticipation of a Change in Control.

         4. Certain Limitations on Payments and Benefits. The Severance Benefits
            --------------------------------------------
payable  under  Section  3.1 hereof  shall be reduced by the amount of any other
payment or the value of any benefit  received or to be received by the Executive
that,  in the opinion of tax counsel ("Tax  Counsel")  selected by the Executive
and acceptable to the Company's  independent auditors, is likely to constitute a
"parachute  payment" under section  28OG(b)(2) of the Code (whether  pursuant to
the terms of this Agreement or any other plan, agreement or arrangement with the
Company  or any  subsidiary,  any  person  whose  actions  result in a Change in
Control,  or any person  affiliated  with the Company or such person) unless (A)
the  Executive  shall have  effectively  waived his receipt or enjoyment of such
payment or benefit prior to the date of payment of such Severance Benefits,  (B)
or in the opinion of Tax Counsel,  the Severance  Benefits (in their full amount
or as partially reduced under this Section 4, as the case may be) plus all other
payments or benefits that constitute  "parachute payments" within the meaning of
section  280(b)(2)  of the Code are  likely to be  reasonable  compensation  for
services actually rendered, within the meaning of section 28OG(b)(4) of the Code
or are  otherwise  not likely to be subject to  disallowance  as a deduction  by
reason of  section  28OG of the Code.  The value of any  noncash  benefit or any
deferred  payment or benefit shall be  determined  by the Company's  independent
auditors in accordance with the principles of section  28OG(d)(3) and (4) of the
Code.

         5. Timing of Payments.  The payment  provided for in Section 3.1 hereof
            ------------------
shall be made on the Date of Termination, provided, however, that if the amounts
of such payment cannot be finally  determined on or before such day, the Company
shall pay to the Executive on such day an estimate,  as determined in good faith
by the  Company,  of the  minimum  amount  of such  payment  and  shall  pay the
remainder  of such  payment  (together  with  interest  at the rate  provided in
Section 1274(b)(2)(B) of the Code from the Date of Termination to the payment of
such  remainder) as soon as the amount thereof can be determined but in no event
later than the thirtieth (30th) day after the Date of Termination.  In the event
that the  amount  of the  estimated  payment  exceeds  the  amount  subsequently
determined to have been due, such excess shall  constitute a loan by the Company
to the  Executive,  payable on the fifth (5th)  business day after demand by the
Company (together


<PAGE>



with interest at the rate provided in Section 1274(b)(2)(B) of the Code from the
Date of Termination to the repayment of such excess).

         6. Reimbursement of Legal Costs. The Company shall pay to the Executive
            ----------------------------
all reasonable legal fees and expenses  incurred by the Executive as a result of
a termination  that entitles the Executive to any payments  under this Agreement
including  all  such  fees and  expenses,  if any,  incurred  in  contesting  or
disputing  any Notice of  Termination  under Section 7.2 hereof or in seeking to
obtain  or  enforce  any  right or  benefit  provided  by this  Agreement  or in
connection  with any tax audit or proceeding to the extent  attributable  to the
application  of Section  4999 of the Code to any  payment  or  benefit  provided
hereunder.  Such  payments  shall be made  within five (5)  business  days after
delivery of the Executive's  respective written requests for payment accompanied
with such evidence of fees and expenses  incurred as the Company  reasonably may
require.

         7.  Termination Procedures.
             ----------------------

                  7.1 Notice of Termination. After a Potential Change in Control
                      ---------------------
or a Change in Control,  any  termination of the Executive's  employment  (other
than by reason of death)  must be preceded  by a written  Notice of  Termination
from the terminating  party to the other party hereto in accordance with Section
8.5 hereof. For purposes of this Agreement, a "Notice of Termination" shall mean
a  notice  which  shall  (i)  specify  the  date of  termination  (the  "Date of
Termination")  which  shall not be more than  sixty (60) days from the date such
Notice of  Termination  is given,  (ii) indicate the notifying  party's  opinion
regarding the specific  provisions of this  Agreement  that will apply upon such
termination and (iii) set forth in reasonable detail the facts and circumstances
claimed  to provide a basis for the  application  of the  provisions  indicated.
Termination of the Executive's  employment  shall occur on the specified Date of
Termination  even if there is a dispute between the parties  pursuant to Section
7.2 hereof  relating to the  provisions  of this  Agreement  applicable  to such
termination.

                  7.2 Dispute Concerning Applicable Termination  Provisions.  If
                      -----------------------------------------------------
within  thirty  (30)  days of  receiving  the  Notice of  Termination  the party
receiving such notice notifies the other party that a dispute exists  concerning
the  provisions of this Agreement  that apply to such  termination,  the dispute
shall be  resolved  either by mutual  written  agreement  of the  parties  or by
expedited  commercial  arbitration  under the rules of the American  Arbitration
Association,  pursuant to the procedures  set forth in Section 8.14 herein.  The
parties shall pursue the resolution of such dispute with  reasonable  diligence.
Within five (5) days of such a resolution, any party owing any payments pursuant
to the provisions of this Agreement  shall make all such payments  together with
interest  accrued thereon at the rate provided in Section  1274(b)(2)(B)  of the
Code.

         8.  Miscellaneous.
             ------------- 

                  8.1 No Mitigation. The Company agrees that, if the Executive's
                      -------------
employment  by the Company is terminated in a manner that results in the payment
of Severance  Benefits  hereunder,  the Executive  shall not be required to seek
other  employment or to attempt in any way to reduce any amounts  payable to the
Executive by the Company pursuant to this Agreement.  Further, the amount of any
payment or benefit provided for under this Agreement shall not be reduced by any
compensation  earned by the  Executive  as the result of  employment  by another
employer,  by retirement  benefits,  by offset  against any amount claimed to be
owed by the Executive to the Company, or otherwise.

                  8.2 Successors.  In addition to any obligations imposed by law
                      ----------
upon any successor to the Company, the Company shall be obligated to require any
successor  (whether  direct or  indirect,  by purchase,  merger,  consolidation,
operation  of law, or  otherwise)  to all or  substantially  all of the business
and/or  assets of the  Company to  expressly  assume  and agree to perform  this
Agreement  in the same manner and to the same  extent that the Company  would be
required to perform it if no such  succession  had taken place;  in the event of
such a succession, references to the "Company" herein shall thereafter be deemed
to include such successor.  Failure of the Company to obtain such assumption and
agreement prior to the effectiveness of any such succession shall be a breach of
this Agreement and shall entitle the Executive to terminate his employment  and


<PAGE>



thereafter  to  receive  Severance  Benefits,  except  that,  for  purposes of  
implementing  the  foregoing,  the  date on  which  any such succession becomes 
effective shall be deemed the Date of Termination.

                  8.3 Incompetency. Any benefit payable to or for the benefit of
                      ------------
the  Executive,  if  legally  incompetent,  or  incapable  of  giving a  receipt
therefor,  shall be deemed paid when paid to the Executive's  guardian or to the
party providing or reasonably  appearing to provide for the care of such person,
and such payment shall fully discharge the Company.

                  8.4 Death. This Agreement shall inure to the benefit of and be
                      -----
enforceable by the  Executive's  personal or legal  representatives,  executors,
administrators,  successors, heirs, distributees,  devisees and legatees. If the
Executive  shall die while any amount  would  still be payable to the  Executive
hereunder (other than amounts which, by their terms, terminate upon the death of
the Executive) if the Executive had continued to live, all such amounts,  unless
otherwise  provided  herein,  shall be paid in accordance with the terms of this
Agreement to the executors,  personal  representatives  or administrators of the
Executive's estate.

                  8.5 Notices.  For the purpose of this  Agreement,  notices and
                      -------
all other  communications  provided for in the Agreement shall be in writing and
shall be  deemed  to have been duly  given  when  delivered  or mailed by United
States registered mail, return receipt requested,  postage prepaid, addressed to
the  respective  addresses  set forth below,  or to such other address as either
party may have furnished to the other in writing in accordance herewith,  except
that notice of change of address shall be effective only upon actual receipt:

                         To the Company:

                         American Mobile Satellite Corporation
                         10802 Parkridge Boulevard
                         Reston, Virginia  22091

                         Attention:

                         To the Executive:

                         [Name of Executive]
                         [Address of Executive]

                  8.6  Modification,  Waiver. No provision of this Agreement may
                       ---------------------
be modified, waived or discharged unless such waiver,  modification or discharge
is agreed to in writing and signed by the  Executive  and such officer as may be
specifically  designated by the Board or its delegee.  No waiver by either party
hereto at any time of any breach by the other  party  hereto  of, or  compliance
with, any condition or provision of this Agreement to be performed by such other
party shall be deemed a waiver of similar or dissimilar provisions or conditions
at the same or at any prior or subsequent time.

                  8.7 Entire Agreement.  No agreements or representations,  oral
                      ----------------
or otherwise, express or implied, with respect to the subject matter hereof have
been made by either party which are not expressly set forth in this Agreement.

                  8.8 Governing Law. The validity, interpretation,  construction
                      -------------
and  performance  of  this  Agreement  shall  be  governed  by the  laws  of the
Commonwealth  of Virginia  without  regard to  principles  of  conflicts of laws
thereof.

                  8.9    Statutory Changes.  All references  to  sections of the
                         -----------------
Exchange  Act or  the  Code shall  be  deemed  also  to refer  to  any successor
provisions to such sections.


<PAGE>




                  8.10 Withholding. Any payments provided for hereunder shall be
                       -----------
paid net of any applicable  withholding  required under federal,  state or local
law and any additional withholding to which the Executive has agreed.

                  8.11  Validity.  The  invalidity  or  unenforceability  of any
                        --------
provision of this Agreement shall not affect the validity or  enforceability  of
any other  provision  of this  Agreement,  which shall  remain in full force and
effect.

                  8.12  No  Right  to  Continued  Employment.  Nothing  in  this
                        ------------------------------------
Agreement  shall be deemed to give any Executive the right to be retained in the
employ  of the  Company,  or to  interfere  with  the  right of the  Company  to
discharge  the Executive at any time and for any lawful  reason,  subject in all
cases to the terms of this Agreement.

                  8.13 No Assignment of Benefits.  Except as otherwise  provided
                       -------------------------
herein or by law,  no right or  interest of any  Executive  under the  Agreement
shall be assignable or transferable,  in whole or in part, either directly or by
operation of law or otherwise,  including without limitation by execution, levy,
garnishment,  attachment,  pledge or in any manner;  no attempted  assignment or
transfer  thereof shall be effective;  and no right or interest of any Executive
under this  Agreement  shall be liable  for, or subject  to, any  obligation  or
liability of such Executive.

                  8.14  Arbitration  Procedures.  All disputes  relating to this
                        -----------------------
Agreement,  including without  limitation any disputes under Section 7.2 hereof,
shall be submitted to expedited  commercial  arbitration  under the rules of the
American  Arbitration  Association in Washington,  D.C.,  with an arbiter who is
mutually  acceptable  to both  parties  being  selected  to  preside  over  such
arbitration.  The Federal Rules of Evidence  shall apply,  and the arbiter shall
establish  the  applicable  rules  of  discovery.  The  prevailing  party in any
arbitration  shall be  entitled  to  recover  from the other  party all fees and
expenses  (including,   without  limitation,   reasonable  attorney's  fees  and
disbursements)  incurred in connection with such arbitration.  The arbiter shall
determine  the scope of  arbitrability.  The only  judicial  relief shall be (a)
interim equitable relief and (b) relief in aid of or to enforce arbitration.

                  8.15 Headings.  The headings and captions  herein are provided
                       --------
for  reference  and  convenience  only,  shall  not be  considered  part of this
Agreement, and shall not be employed in the construction of this Agreement.

         9.  Definitions.
             ----------- 

                  9.1  "Annual  Base  Salary"  means  the  greater  of  (a)  the
                       ---------------------
Executive's  highest annual base salary in effect during the one (1) year period
preceding a Change in Control and (b) the Executive's highest annual base salary
in effect  during the one (1) year  period  preceding  the  Executive's  Date of
Termination.

                  9.2 "Average  Bonus" means the greater of (a) the  Executive's
                      ---------------
average  annual bonus for the two fiscal years (or such  shorter  period  (which
shall be  annualized)  during  which  the  Executive  has been  employed  by the
Company)  immediately  preceding  the  fiscal  year in which a Change in Control
occurs and (b) the  Executive's  average Bonus for the two fiscal years (or such
shorter period (which shall be  annualized)  during which the Executive has been
employed by the Company)  immediately  preceding the fiscal year which  includes
the Executive's Date of Termination.

                  9.3    "Board" means the Board of Directors of the Company.
                         -------

                  9.4    "Cause" means:
                         --------

                         (a)  the willful and continued failure of the Executive
to substantially perform the Executive's duties with the Company (other than any
such failure resulting from incapacity due to physical or mental illness), after


<PAGE>



a  written  demand  for substantial performance is delivered to the Executive by
the Board of the Company which  specifically  identifies the manner in which the
Board  believes  that  the  Executive  has  not  substantially  performed  the 
Executive's duties;

                         (b)  the  willful engaging  by the Executive in illegal
conduct or gross misconduct which  is  materially and demonstrably injurious to 
the Company;

                         (c)  personal dishonesty or breach of fiduciary duty to
the Company that in either case  results  or  was intended to result in personal
profit to the Executive at the expense of the Company; or

                         (d)  willful violation of any law, rule or regulation 
(other than traffic violations, misdemeanors or similar  offenses) or cease-and-
desist  order,  court  order, judgment  or   supervisory   agreement,   which   
violation  is  materially  and demonstrably injurious to the Company.

     For  purposes of the  preceding  clauses,  no act or failure to act, on the
part of the  Executive,  shall be  considered  "willful"  unless it is done,  or
omitted to be done, by the Executive in bad faith and without  reasonable belief
that  the  Executive's  action  or  omission  was in the best  interests  of the
Company.  Any act,  or failure to act,  based upon prior  approval  given by the
Board or upon the instructions or with the approval of the Executive's  superior
or based upon the  advice of  counsel  for the  Company,  shall be  conclusively
presumed to be done,  or omitted to be done,  by the Executive in good faith and
in the best  interests  of the  Company.  The  cessation  of  employment  of the
Executive  shall not be deemed to be for Cause unless and until there shall have
been delivered to the Executive, as part of the Notice of Termination, a copy of
a  resolution   duly  adopted  by  the   affirmative   vote  of  not  less  than
three-quarters  (3/4) of the entire  membership of the Board at a meeting of the
Board called and held for the purpose of  considering  such  termination  (after
reasonable  notice is provided to the  Executive  and the  Executive is given an
opportunity,  together with counsel, to be heard before the Board) finding that,
in the good faith  opinion of the Board,  the Executive is guilty of the conduct
described in clause (a), (b), (c), or (d) above,  and specifying the particulars
thereof in detail.

                  9.5    A "Change in Control" means the occurrence of any of 
                           -------------------
the following events:
                         (a)  any Person or Persons acting together, excluding 
employee benefit plans of the Company,  are or become the  "beneficial  owner" 
(as  defined in Rules 13d-3 and 13d-5 under the Exchange Act or any successor  
provisions thereto except that a Person that has the right to acquire securities
of the Company shall be deemed to be the "beneficial  owner" of such  securities
whether or not such right is immediately  exercisable),  directly or indirectly,
of securities of the Company representing  forty  percent  (40%) or more of the 
combined voting power of the Company's then outstanding securities determined as
if all rights of such Person or  Persons  to acquire such  securities had been 
exercised  immediately  prior to  such determination  whether or not such rights
are then immediately exercisable;

                         (b)  the Company's shareholders approve (or, in the 
event no approval of the Company's   shareholders  is  required,   the  Company 
consummates)  a  merger, consolidation,  share exchange,  division or other 
reorganization or transaction of the Company (a "Fundamental  Transaction") with
any other corporation, other than a Fundamental  Transaction  which would result
in the voting  securities of the Company outstanding immediately  prior  thereto
continuing  to  represent (either by remaining outstanding or by being converted
into voting securities of the surviving entity) at least eighty percent (80%) of
the combined voting power immediately after such Fundamental  Transaction of (i)
the Company's outstanding  securities,  (ii) the surviving entity's outstanding 
securities, or (iii) in the  case of  a division, the outstanding securities of 
each entity resulting from the  division,  in each case  determined  as  if  all
rights to acquire such  securities had been exercised immediately prior to such 
determination,  whether or not such rights are then immediately exercisable;

                         (c)  the shareholders of the Company approve a plan of 
complete liquidation or winding-up of the  Company or an agreement for the sale 
or  disposition  (in  one  transaction  or  a  series of transactions) of all or
substantially all of the Company's assets;


<PAGE>



                         (d)  during any  period  of  twenty-four consecutive 
months, individuals who at the beginning of such period  constituted the Board  
(including for this purpose any new  director  whose  election  or  nomination  
for  election  by the  Company's shareholders  was  approved  by a  vote  of at 
least two-thirds (2/3) of the directors then still in office who were  directors
at the  beginning of such period) cease for any reason to constitute at least a 
majority of the Board.

                  9.6 "Code" means the Internal Revenue Code of 1986, as amended
                      ------
from time to time.

                  9.7 "Company" means American Mobile Satellite Corporation.  If
                      ---------
the Executive  becomes  employed by a direct or indirect  Subsidiary of American
Mobile Satellite Corporation, the "Company" shall also be deemed to refer to the
Subsidiary thereof by which the Executive is employed.  In such case, references
to  payments,  benefits,  privileges  or  other  rights  to be  accorded  by the
"Company"  shall be deemed to include such  payments,  benefits,  privileges  or
other rights to be provided by the Subsidiary by which the Executive is employed
or American Mobile Satellite  Corporation,  as the case may be, to correspond to
the corporate entity obligated to make payments or provide benefits,  privileges
or other rights  pursuant to employee  benefit plans  affected by the provisions
hereof,  and in the  absence  of any such  existing  plans or  provisions,  such
reference shall be deemed to be to American Mobile Satellite Corporation.

                  9.8 "Coverage  Period" means the period commencing on the date
                      ------------------
on which a Change in Control  occurs and ending on the second  anniversary  date
thereof.

                  9.9    "Date of Termination" has the meaning assigned to such 
                         ---------------------
term in Section 7.1 hereof.

                  9.10  "Disability"  means  the  complete   disability  of  the
                        ------------  
Executive under the Company's [appropriate plan], as amended from time to time.

                  9.11   "Exchange Act" means the Securities Exchange Act of 
                         --------------
1934, as amended from time to time.

                  9.12   "Good Reason" means: the occurrence during the Coverage
                         -------------
 Period of any of the following events:

                         (a)  the  assignment to  the  Executive of any duties 
inconsistent in any respect with the Executive's  position  (including  status,
offices,   titles  and  reporting  requirements),  authority,  duties  or 
responsibilities immediately prior to either a Potential Change in Control that 
precedes the Change in Control or a Change in Control or any other action by the
Company  which results in  a diminution  in any  respect in  such  position,  
authority, duties or responsibilities,  excluding for this purpose an isolated, 
insubstantial and inadvertent action not taken in bad faith that is remedied by 
the Company  promptly  after receipt of notice thereof given by the Executive;

                         (b)   a reduction by the Company in the Executive's 
annual base salary as in effect on  the  date  hereof  or  as  the  same may be 
increased from time to time;

                         (c)   the Company's requiring the Executive to be based
at any office or location that is  more  than  fifty  (50)  miles  from  the  
Executive's  office  or  location immediately prior to either a Potential Change
in Control that precedes a Change in Control or a Change in Control;

                         (d)  the failure by the Company (a) to continue in 
effect any compensation plan in which the Executive  participates  immediately  
prior to either a Potential  Change in Control preceding a Change in Control or 
a Change in Control that is material to  the  Executive's  total compensation, 
unless an equitable arrangement (embodied  in  an  ongoing  substitute  or  
alternative  plan) has been made with respect to such plan,  or (b) to  continue
the  Executive's  participation  therein (or in such substitute or alternative  
plan) on a basis not materially less favorable,  both in terms of the amount of 
benefits  provided  and the level of the  Executive's participation relative to 
other participants,  than existed immediately prior to  a Potential Change  in 
Control that precedes a Change in Control or a Change in Control;

<PAGE>


                         (e)  the failure by the Company to continue to provide 
the Executive with benefits substantially  similar  to  those  enjoyed  by the  
Executive  under  any of the Company's pension, life insurance,  medical, health
and accident,  disability or  other welfare plans in which the Executive was  
participating immediately prior to a Potential  Change in Control that  precedes
a Change in Control or a Change in Control;

                         (f)  the failure by the Company to pay to the Executive
any deferred compensation  when  due  under  any  deferred compensation plan or 
agreement applicable to the Executive; or

                         (g)   the failure by the Company to honor all the terms
and provisions of this Agreement.

                  9.13   "Notice of Termination" shall have the meaning assigned
                         -----------------------
to such term in Section 6.1 hereof.

                  9.14 "Person" shall have the meaning given in Section  3(a)(9)
                       --------
of the Exchange Act and shall also include any syndicate or group deemed to be a
"person" under Section 13(d)(3) of the Exchange Act.

                  9.15   "Potential Change in Control" means the occurrence of 
                         -----------------------------
any of the following:

                         (a)  the Board approves a transaction  described  in 
subsection (a), (b), (c) or (d) of the definition of Change in Control contained
in Section 9.4 hereof; or

                         (b)  the commencement of a proxy contest in which any 
Person seeks to replace or remove a majority of the members of the Board.

                  9.16   "Severance Benefits" has the meaning assigned to such 
                         --------------------
term in Section 3 hereof.

                  9.17  "Triggering  Event"  means  (i) the  termination  of the
                        -------------------
Executive's  employment  by the Company at any time during the Coverage  Period,
other  than a  termination  for Cause or a  termination  due to the  Executive's
Disability or death or (ii) a termination of the  Executive's  employment by the
Executive at any time during the Coverage Period when Good Reason exists.

                  IN WITNESS  WHEREOF,  the Company has caused this Agreement to
be executed by its officer,  thereunto  duly  authorized,  and the Executive has
executed this Agreement, all as of the day and year first above written.

                               AMERICAN MOBILE SATELLITE CORPORATION


                               By:
                               Name:  Gary M. Parsons
                               Title: President and Chief Executive Officer




                               [Name of Executive]





                                                  AMENDMENT NO. 1
                                          TO GUARANTY ISSUANCE AGREEMENT


         AMENDMENT,  dated  as of  March  27,  1997,  to the  Guaranty  Issuance
Agreement,  dated  as  of  June  28,  1996,  by  and  among  Hughes  Electronics
Corporation,  Singapore  Telecommunications  Ltd., Baron Capital Partners, L.P.,
AMSC  Subsidiary  Corporation  and American Mobile  Satellite  Corporation  (the
"Agreement").

                                               W I T N E S S E T H:

         WHEREAS,  the  parties  hereto  desire to effect certain changes to the
Agreement herein contained;

         NOW, THEREFORE, the undersigned parties hereto agree as follows:

         SECTION 1.  Definitions.  Unless otherwise indicated, capitalized terms
used herein shall have the meanings set forth in the Agreement.

         SECTION  2.  Consideration  for  the  Issuance  of the  Guaranties.  As
consideration  for the execution of this Amendment No. 1 by the Guarantors,  the
Warrants  issued to each of the Guarantors in connection with the Guarantees are
hereby amended to reflect an increase in the aggregate  number of Warrant Shares
to 5,500,000  and a change in the  exercise  price to $13.00.  To implement  the
foregoing,  an amendment to each of such Warrants,  in the form annexed  hereto,
has been executed concurrently with the execution hereof.

         SECTION 3. Change to the Performance Schedule. The Performance Schedule
annexed to the  Agreement  as Exhibit D is hereby  amended in its  entirety  and
replaced with the Performance Schedule annexed hereto.

         SECTION 4. Section 3 of the Agreement is hereby amended in its entirety
and replaced with the following:

Limitations  on Amount of  Guaranties.  AMSC and AMSC Parent have  delivered  to
Guarantors  AMSC's 1997 Budget,  including  its projected  borrowing  needs (the
"Plan"), which has formed the basis for the agreement of the Guarantors to enter
into this Amendment No. 1. As consideration  for the execution of this Amendment
No. 1 by the Guarantors,  AMSC agrees that the outstanding  principal  amount of
the loans which are guaranteed (such outstanding amount and any payments made by
Guarantors with respect to principal under the Credit Agreement, the "Guaranteed
Amount") shall not, at any time, exceed the then applicable borrowing limit (the
"Borrowing  Limit")  specified on the  Performance  Schedule  attached hereto as
Exhibit D (the "Performance Schedule").


                                        1

<PAGE>



         AMSC and AMSC Parent  agree that the  aggregate  outstanding  principal
amount of the loans under the Credit  Agreements  plus any  amounts  paid by the
Guarantors with respect to principal shall not exceed the Guaranteed Amount. The
Guarantors having Pro Rata Shares greater than 50% ("Requisite Guarantors") may,
by written notice  delivered to AMSC,  waive compliance with the then applicable
Borrowing  Limit and  consent to  borrowings  by AMSC which would  increase  the
Guaranteed Amount up to the "Borrowing Limit" specified by such waiver. A waiver
granted  hereunder  shall not obligate the  Guarantors to grant a waiver for any
subsequent  period or  consent  to any  additional  increase  in the  applicable
Borrowing Limit.

         If any borrowing causes or would cause the Guaranteed  Amount to exceed
the then applicable Borrowing Limit, then Requisite Guarantors may, by a written
notice  delivered  to AMSC (a  "Guarantor's  Notice"),  decline to increase  the
Guaranteed  Amount to cover  any  increased  borrowings.  Under the terms of the
Guaranties,  Guarantors will be required to purchase the outstanding  notes upon
the  occurrence  of a  "Guarantor  Event" under the Credit  Agreements,  and the
commitments  to extend  further  financing  under  the  Credit  Agreements  will
terminate.

         Under  the  terms  of the  Credit  Agreements,  at  the  time  of  each
borrowing,  AMSC will be required to certify that it is in  compliance  with the
provisions  of this  Agreement.  AMSC  or  AMSC  Parent  can so  certify  if the
outstanding  amount of the loans after such borrowing will be less than the then
applicable  Borrowing Limit or if, and to the extent that,  Requisite Guarantors
shall  have  modified  such  Borrowing  Limit.  At the  request of AMSC and AMSC
Parent,  any  Borrowing  Limit  may be  modified  with the  written  consent  of
Requisite Guarantors. If Requisite Guarantors propose to increase the applicable
Borrowing  Limit for any  period to an amount in excess of that set forth on the
Performance Schedule, such proposal shall be discussed with the other Guarantors
prior to granting such consent.

         Any action by Requisite  Guarantors in  accordance  with this Section 3
shall bind all  Guarantors.  Any notice  delivered  under this Section  shall be
delivered  to all  Guarantors,  but failure of all  Guarantors  to receive  such
notice shall not affect the validity of such notice.

         Nothing  in  this  Section  shall  limit  the   enforceability  by  the
"Guaranteed Parties" of any Guaranty in accordance with its terms.

         Within 45 days after the end of each fiscal quarter,  AMSC Parent shall
deliver to each Guarantor the unaudited  consolidated and consolidating  balance
sheets of AMSC and AMSC  Parent as of the end of such  quarter  and the  related
consolidated and consolidating  statements of income,  stockholders'  equity and
cash flows, and certified by the chief financial  officer as fairly  presenting,
in all material  respects,  in accordance  with  generally  accepted  accounting
principles  (except for  the  absence  of  footnote  disclosure),  the financial
position and the results of operations of AMSC and AMSC Parent.

                                        2

<PAGE>





         SECTION 5.  Miscellaneous.

            (a)     AMSC and AMSC Parent hereby  represent  to  the  Guarantors
                    that, as of the date hereof, and after giving effect to this
                    Amendment No. 1 and the transactions contemplated hereby, no
                    Default  (as such term in defined in the Credit  Agreements)
                    has occurred and is continuing.

            (b)     AMSC hereby reaffirms that the Registration Rights Agreement
                    is in full  force and  effect  and that all of the shares of
                    common stock of AMSC Parent  issuable  upon  exercise of the
                    Warrants,  as such  number of shares has been  increased  as
                    described in this  Amendment No. 1,  constitute  Registrable
                    Securities  (as such  term is  defined  in the  Registration
                    Rights Agreement).

            (c)     AMSC and AMSC Parent hereby represent to the Guarantors that
                    each  representation and warranty set forth in Section 11 of
                    the  Agreement  is true and  correct as of the date  hereof,
                    except that (i) each reference  therein to "this  Agreement"
                    shall be deemed to be a reference to this  Amendment  No. 1,
                    (ii) all references to the Warrants, the Registration Rights
                    Agreement  and the Common  Stock  shall  give  effect to the
                    transactions contemplated hereby, and (iii) the reference in
                    Section  11(e) of the Agreement to December 31, 1995 instead
                    shall be to December 31, 1996.

            (d)     Except  as expressly  amended  hereby,  the  terms  of  the 
                    Agreement remain  unchanged  and the  Agreement, as amended 
                    hereby, continues in full force and effect.

            (e)     Concurrently with the execution hereof, each Guarantor shall
                    receive  the  written  opinion  of  counsel to AMSC and AMSC
                    Parent   as  to  the  due   authorization,   execution   and
                    enforceability  of this  Amendment No. 1 and Amendment No. 1
                    to  the  Warrant   Certificates,   in  form  and   substance
                    satisfactory to each Guarantor; and

            (f)     AMSC Parent  hereby  advises  each of the  Guarantors that
                    the  Board of  Directors  of AMSC  Parent  has  received  an
                    opinion  from  Donaldson,   Lufkin  &  Jenrette   Securities
                    Corporation to the effect that the transactions contemplated
                    hereby,  including  the  increase  in the  number  of shares
                    covered by the  Warrants  and the  reduction of the exercise
                    price of the Warrants, are fair to AMSC and AMSC Parent from
                    a financial point of view.


                                        3

<PAGE>



            
         SECTION 6.  Governing Law.  This Amendment shall be governed by and
construed in accordance with the laws of the State of New York.

         SECTION 7. Counterparts.  This Amendment may be signed in any number of
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

         SECTION 8.  Effectiveness.  This Amendment shall become  effective when
AMSC has received  signature pages hereof signed by the Requisite  Guarantors or
facsimile  or  other  written  confirmation  that  such  parties  have  signed a
counterpart hereof.



                                        4

<PAGE>



         IN  WITNESS  WHEREOF,  each  of the  parties  hereto  has  caused  this
Amendment No. 1 to the Agreement to be executed by its duly authorized officer.

AMSC SUBSIDIARY CORPORATION                 SINGAPORE TELECOMMUNICATIONS
                                             LTD.

By:  /s/RICHARD J. BURNHEIMER                     By:  /s/HO SIAW HONG
     ---------------------------                  ---------------------------
     Name: Richard J. Burnheimer                  Name: Ho Siaw Hong
     Title: VP & Treasurer                        Title: Senior Director

AMERICAN MOBILE SATELLITE                    BARON CAPITAL PARTNERS, L.P.,
 CORPORATION                                   a Delaware limited partnership
                            
By:  /s/RICHARD J. BURNHEIMER                By:  Baron Capital Management,
     ---------------------------                   Inc., a General Partner
     Name: Richard J. Burnheimer                 
     Title: VP & Treasurer                   By:  /s/MORTY SCHAJA     
                                                  ---------------------------
HUGHES ELECTRONICS CORPORATION                    Name:  Morty Schaja
                                                  Title: V.P.
By:  /s/AMNON CARR
     ---------------------------
     Name: Amnon Carr                        
     Title: Assistant Treasurer            

                                           

                                                     


                                        5

<PAGE>


                                    EXHIBIT D

                                       TO

                          GUARANTEE ISSUANCE AGREEMENT
                     (As Amended by Amendment No. 1 thereto)


                              Performance Schedule
                                    ($000's)

<TABLE>
<CAPTION>
<S>               <C>               <C>              <C>               <C>      
                  01/01/97          04/01/97         07/01/97          10/01/97
                     to                to               to                to
                  03/31/97          06/30/97         09/30/97          12/31/97
                  --------          --------         --------          --------


Borrowing Limit   $170,000          $180,000         $190,000          $200,000

</TABLE>


                                        6

<PAGE>
                                 AMENDMENT NO. 1
              TO WARRANT CERTIFICATES FOR THE PURCHASE OF SHARES OF
              COMMON STOCK OF AMERICAN MOBILE SATELLITE CORPORATION


         AMENDMENT,  dated  as of  March  27,  1997,  to each of  those  Warrant
Certificates  dated as of June 28, 1996 (the  "Warrants" and  capitalized  terms
used herein and not otherwise  defined shall have the meanings  ascribed thereto
in  the  Warrants),   issued  by  American  Mobile  Satellite  Corporation  (the
"Company")   to   each   of   Hughes    Electronics    Corporation,    Singapore
Telecommunications Ltd. and Baron
Capital Partners, L.P. (collectively, the "Holders").

                              W I T N E S S E T H:

         WHEREAS,  the Company  previously  issued to the Holders  Warrants that
represented  in the aggregate the right to purchase  5,000,000  shares of Common
Stock at an Exercise Price of $24.00 per share;

         WHEREAS, the Company, the Holders and AMSC are entering into on the 
date hereof Amendment No. 1 ("Amendment No. 1") to the Guaranty Issuance 
Agreement;

         WHEREAS, as contemplated by Amendment No.1, the parties hereto desire 
to amend certain terms of the Warrants.

         NOW, THEREFORE, the undersigned parties hereto agree as follows:

         SECTION 1.  Amendments.

         a. Section 1 of each of the Warrants is hereby amended by modifying the
definition  of "Exercise  Price" to read in its  entirety as follows:  "Exercise
Price" means initially $13.00 per Warrant Share, as adjusted from time to time.

         b.  The  Warrant Share Amount reflected in the preamble to each of the
Warrants shall be modified as follows:
<TABLE>
<CAPTION>

                  Holder                                   Warrant Share Amount
                  ------                                   --------------------

<S>                                                                  <C>      
         Hughes Electronics Corporation                              4,125,000

         Singapore Telecommunications Ltd.                             687,500

         Baron Capital Partners, L.P.                                  687,500
</TABLE>

                                        1

<PAGE>


         c.  Section 15 of the Warrants is hereby deleted in its entirety.

         SECTION 2.  Reaffirmance. Except as expressly amended hereby, the terms
of the Warrants remain unchanged and the Warrants, as amended hereby, are in 
full force and effect.

         SECTION 3.  Issuance of  Replacement  Warrant.  Upon the request of any
Holder,  the Company  promptly  shall  issue a new  Warrant,  incorporating  the
amendments effected hereby, to replace the presently outstanding Warrant held by
such Holder.

         IN  WITNESS  WHEREOF,  each of the  parties  hereto has  executed  this
Amendment No. 1 by its duly authorized  officer as of the day and year first set
forth above.



AMERICAN MOBILE SATELLITE                    SINGAPORE TELECOMMUNICATIONS
  CORPORATION                                 LTD.

By:  /s/RICHARD J. BURNHEIMER                     By:  /s/HO SIAW HONG
     ---------------------------                  ---------------------------
     Name: Richard J. Burnheimer                  Name: Ho Siaw Hong
     Title: VP & Treasurer                        Title: Senior Director

HUGHES ELECTRONICS CORPORATION               BARON CAPITAL PARTNERS, L.P.,
                                              a Delaware limited partnership
By:  /s/AMNON CARR
     ---------------------------
     Name: Amnon Carr                        By:  Baron Capital Management,
     Title: Assistant Treasurer                    Inc., a General Partner

                                             By:  /s/MORTY SCHAJA
                                                  -------------------------
                                                     Name:  Morty Schaja
                                                     Title: V.P.



                                        2

<PAGE>





                                  Exhibit 11.1
                      AMERICAN MOBILE SATELLITE CORPORATION
                        Computation of Net Loss Per Share

                    (In thousands, except per share amounts)

<TABLE>
<CAPTION>
                                                                     Year Ended December 31
                                                                     ----------------------

<S>                                                             <C>         <C>        <C>      
                                                                   1996       1995       1994
                                                                   ----       ----       ----

        Net Loss                                                ($134,638)  ($66,917)  ($21,103)
                                                                ----------  ---------  ---------

        PRIMARY:
                

        Net loss per common share                                  ($5.38)    ($2.69)    ($0.86)
                                                                   -------    -------    -------

        Average shares outstanding                                 25,041     24,900     24,672
                                                                   ------     ------     ------

        FULLY DILUTED:
        

        Net loss (1)                                            ($129,244)  ($66,917)  ($21,103)
                  

        Net loss per common share                                  ($5.13)    ($2.65)    ($0.86)
                                                                   -------    -------    -------

        Average shares outstanding (2)                             25,179     25,278     24,683
                                                                   ------     ------     ------



        (1)  Calculated as follows:

              Primary net loss                                  ($134,638)   ($66,917) ($21,103)
              Amortization of debt discount                         2,253        --         --
              Interest on convertible debt                          3,141        --         --
                                                                  -------      ------    ------
                                                                ($129,244)   ($66,917) ($21,103)
                                                                ----------   --------- ---------


        (2)  Calculated as follows:

            Primary weighted average shares outstanding            25,041     24,900     24,672
            Assumed exercise of stock options 
               (treasury stock method)                                 63         92         11
            Assumed exercise of stock purchase warrants                75        286         --
                                                                  -------     -------    ------
                                                                   25,179     25,278     24,683
                                                                  -------     -------    ------
</TABLE>

                                  EXHIBIT 21.1



              SUBSIDIARIES OF AMERICAN MOBILE SATELLITE CORPORATION


Name                                             Location of Incorporation
- ----                                             -------------------------

American Mobile Radio Corporation                State of Delaware

AMSC Sales Corporation, Ltd.                     Territory of the Virgin Islands

AMSC Skycell, Inc.                               State of Delaware

AMSC Subsidiary Corporation                      State of Delaware and 
                                                 Commonwealth of Virginia

Personal Communications Satellite Corporation    State of Delaware




                                                                    EXHIBIT 23.1


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
                   -----------------------------------------

          As  independent   public   accountants,   we  hereby  consent  to  the
incorporation by reference of our reports dated March 27, 1997, included in this
Form 10-K into  American  Mobile  Satellite  Corporation's  previously filed 
Registration Statements on Form S-8, File Nos. 33-72852, 33-34250 and  33-91714 
and on Form S-3 No. 333-01120.



Washington, D.C.
March 27, 1997



<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
     This schedule  contains summary  financial  information  extracted from the
     Company's unaudited  Consolidated  Statement of Loss,  Consolidated Balance
     Sheet, and  Consolidated Statement of Cash Flows, in each case for the year
     ended December 31, 1996, and is qualified in its entirety by reference to  
     such financial statements.
</LEGEND>
<MULTIPLIER>                                   1,000
<CURRENCY>                                     U.S. Dollars
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                              DEC-31-1996
<PERIOD-START>                                 JAN-01-1996
<PERIOD-END>                                   DEC-31-1996
<EXCHANGE-RATE>                                1
<CASH>                                         2,182 
<SECURITIES>                                   0
<RECEIVABLES>                                  5,080
<ALLOWANCES>                                   1,548
<INVENTORY>                                    38,034
<CURRENT-ASSETS>                               66,146
<PP&E>                                         267,863
<DEPRECIATION>                                 61,447
<TOTAL-ASSETS>                                 350,173
<CURRENT-LIABILITIES>                          57,669 
<BONDS>                                        144,601
                          0
                                    0
<COMMON>                                       251
<OTHER-SE>                                     158,700
<TOTAL-LIABILITY-AND-EQUITY>                   350,173
<SALES>                                        18,529
<TOTAL-REVENUES>                               27,730
<CGS>                                          31,903
<TOTAL-COSTS>                                  104,379
<OTHER-EXPENSES>                               43,390
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                             15,151
<INCOME-PRETAX>                                (134,638)
<INCOME-TAX>                                   0
<INCOME-CONTINUING>                            (134,638)
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   (134,638)
<EPS-PRIMARY>                                  (5.38)
<EPS-DILUTED>                                  (5.13)
        


</TABLE>


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