AMERICAN MOBILE SATELLITE CORP
SC 13D/A, 1999-11-12
COMMUNICATIONS SERVICES, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 8)*

                      American Mobile Satellite Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock $.01 Par Value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   02755R 10 3
              ----------------------------------------------------
                                 (CUSIP Number)
    Ms. Chan Su Shan, Company Secretary, Singapore Telecommunications Limited
       31 Exeter Road, Comcentre, Singapore 239732, Republic of Singapore
                             (011) (65) 838-2201 */
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                November 4, 1999
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box o.

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

*/   With a copy to: Richard S. Elliott, Esq., Paul, Weiss, Rifkind, Wharton &
     Garrison, 1615 L Street, N.W., Suite 1300, Washington, DC 20036, (202)
     223-7324.
<PAGE>

                                  SCHEDULE 13D

CUSIP No.  02755R 10 3                                        Page 2 of    Pages
         -----------------

1       NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Singapore Telecommunications Limited

2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                 (a) |_|
                                                                         (b) |X|

3       SEC USE ONLY

4       SOURCE OF FUNDS

                WC

5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
        PURSUANT TO ITEMS 2(d) or 2(e)                                       |_|

6       CITIZENSHIP OR PLACE OF ORGANIZATION

                Republic of Singapore

                          7        SOLE VOTING POWER

        NUMBER OF                       3,818,464 shares
         SHARES
   BENEFICIALLY OWNED
    BY EACH REPORTING     8        SHARED VOTING POWER
         PERSON
          WITH                          0 shares


                          9        SOLE DISPOSITIVE POWER

                                        3,818,464 shares

                          10       SHARED DISPOSITIVE POWER

                                        0 shares

11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                3,818,464 shares

12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                       |X|

13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                7.7%

14      TYPE OF REPORTING PERSON

                CO
<PAGE>

                                  SCHEDULE 13D


CUSIP No. 02755R 10 3                                         Page 3 of    Pages
         -----------------

1       NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Temasek Holdings (Private) Limited

2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                 (a) |_|
                                                                         (b) |X|

3       SEC USE ONLY

4       SOURCE OF FUNDS

                AF

5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
        PURSUANT TO ITEMS 2(d) or 2(e)                                       |_|

6       CITIZENSHIP OR PLACE OF ORGANIZATION

                Republic of Singapore

                          7        SOLE VOTING POWER

                                           0 shares
        NUMBER OF
         SHARES
   BENEFICIALLY OWNED     8        SHARED VOTING POWER
    BY EACH REPORTING
         PERSON                            3,818,464 shares
          WITH
                          9        SOLE DISPOSITIVE POWER

                                           0 shares

10      SHARED DISPOSITIVE POWER

                3,818,464 shares

11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                3,818,464 shares

12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
        CERTAIN SHARES                                                       |X|

13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                7.7%

14      TYPE OF REPORTING PERSON

                HC
<PAGE>

                                                                               4


                             AMENDED SCHEDULE 13D 1/

Item 5. Interest in Securities of the Issuer

               Item 5 is amended and restated in its entirety as follows:

(a) Singapore Telecom owns beneficially 3,818,464 shares of Common Stock. Of
this amount, 2,990,183 shares of Common Stock are owned of record by Singapore
Telecom, and 828,281 shares of Common Stock could be obtained by Singapore
Telecom upon exercise in full of the Amended Warrant and Warrant No. 2. As noted
in Item 2 above, Singapore Telecom is approximately 80% owned by Temasek. The
filing of this Statement should not, however, be construed as an admission that
Temasek is, for purposes of Section 13(d) of the Act, the beneficial owner of
any of the Common Stock beneficially owned by Singapore Telecom.

               Based upon the information supplied by the Issuer, the 3,818,464
shares of Common Stock beneficially owned by Singapore Telecom constitute
approximately 7.7% of the Common Stock outstanding as of October 31, 1999. 2/

               To the best knowledge of the Reporting Persons, none of the
persons listed in Schedule I or II beneficially own or have the right to acquire
shares of Common Stock.

               The Reporting Persons may be deemed to comprise a group (within
the meaning of Section 13(d)(3) of the Act) with the following entities by
virtue of certain agreements described in Item 6 below: (1) Hughes Electronics
Corporation ("Hughes Electronics") and Hughes Communications Satellite Services,
Inc. ("Hughes" and, together with Hughes Electronics, the "Hughes Entities"), an
indirect wholly-owned subsidiary of Hughes Electronics; and (2) Space
Technologies Investments, Inc. ("Investments") and the following affiliates of
Investments: Transit Communications, Inc., and Satellite Communications
Investments Corporation (collectively with Investments, the "AT&T Entities"). 3/

- ----------

1/   Amending the Amended and Restated Schedule 13D dated December 28, 1995.

2/   For the purpose of computing this percentage, the Amended Warrant and
     Warrant No. 2 were deemed to be exercised in full and the shares of Common
     Stock issuable upon such exercise were deemed to be outstanding.

3/   Prior to the conversion of the remaining Mtel Convertible Debentures in
     December 1995, and the resulting transfer of the 760,869 shares of Common
     Stock from Mtel L.P. to Singapore Telecom, the following entities might
     also have been deemed to be part of such group: Mtel L.P., Mtel Space
     Technologies Corporation ("Mtel Corp.") (Mtel L.P.'s general partner), and
     Mtel Technologies, Inc. ("Mtel Corp. Affiliate") (Mtel L.P.'s limited
     partner) (collectively, the "Mtel Group").
<PAGE>

                                                                               5


               The Reporting Persons expressly disclaim beneficial ownership of
shares of Common Stock beneficially owned by the Hughes Entities and the AT&T
Entities, and the filing of this statement by the Reporting Persons shall not be
construed as an admission by the Reporting Persons that either of them is, for
purposes of Section 13(d) of the Act, the beneficial owner of any of the shares
of Common Stock held by the Hughes Entities or the AT&T Entities.

               Based upon information supplied by the Issuer, the Reporting
Persons believe that the Hughes Entities and the AT&T Entities beneficially own
the number of shares of Common Stock set forth in the table below as of October
31, 1999, constituting in each case that percentage of the outstanding Common
Stock set forth in the table:

- ----------

3/ (...continued)
the "Mtel Group")
<PAGE>

                                                                               6


Name of Beneficial Owner                Number of Shares           Percentage

Hughes Communications
  Satellite Services, Inc. 4/                6,692,108                 --

Hughes Electronics Corporation 5/            4,969,688                 --
                                            ----------             ----------
        Hughes Entities as a Group          11,661,796               21.8 6/

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

Space Technologies
  Investments, Inc.                          1,206,192                 --

Transit Communications, Inc.                   681,818                 --

Satellite Communications
  Investments Corporation                    1,113,135                 --
                                            ----------             ----------
        AT&T Entities as a Group             3,001,145                6.2

(b) Singapore Telecom has sole power to vote or to direct the vote, and sole
power to dispose or to direct the disposition of, the shares of Common Stock
beneficially owned by it, subject to the effect of the agreements referred to in
Item 6. As noted in Item 2 above, Singapore Telecom is approximately 80% owned
by Temasek. The filing of this statement should not, however, be construed as an
admission that Temasek is, for purposes of Section 13(d) of

- ----------

4/   Includes 25,486 shares of Common Stock issuable to Hughes upon the exercise
     of certain warrants previously issued by the Issuer. These warrants are
     exercisable through January 19, 2001 at an exercise price of $.01 per
     share.

5/   Consists of 4,205,121 shares of Common Stock issuable upon the exercise of
     a warrant that Hughes Electronics received as part of the consideration for
     a guaranty that it provided in connection with long-term bank financing for
     the Issuer's subsidiary, and 764,567 shares of Common Stock issuable upon
     the exercise of another warrant that Hughes Electronics received as part of
     the consideration for a guaranty that it provided in connection with the
     restructuring of the long-term financing. Each warrant is exercisable
     through March 31, 2005 at an exercise price of $7.3571 per share.

6/   For the purpose of computing this percentage, warrants held by the Hughes
     Entities were deemed to be exercised in full and the shares of Common Stock
     issuable upon such exercise were deemed to be outstanding.
<PAGE>

                                                                               7


the Act, the beneficial owner of any of the Common Stock beneficially owned by
Singapore Telecom.

(c) During the past 60 days, Singapore Telecom has engaged in certain open
market sales of Common Stock, which, in the aggregate, amount to just over 1% of
the shares of Common Stock outstanding as of October 31, 1999 (based on
information supplied by the Issuer). Those sales were as follows:

                                                          Average
Date of Transaction           Number of Shares        Price Per Share
- -------------------           ----------------        ---------------
     11/03/99                     250,000                  $14.71
     11/04/99                     299,463                  $14.00

               The Reporting Persons are not aware of any transactions in shares
of Common Stock that were effectuated during the past 60 days by the Hughes
Entities or the AT&T Entities, or by any of the persons listed in Schedule I or
II.

(d) The Reporting Persons do not know of any other person having the right to
receive or the power to direct the receipt of dividends from, or the proceeds
from the sale of, the shares of Common Stock beneficially owned by the Reporting
Persons.

(e) Not applicable.

Item 7. Material to be Filed as Exhibits

               Exhibit I in Item 7 is amended as follows:

Exhibit I -- Joint Filing Agreement dated November 11, 1999
<PAGE>

                                                                               8

                                   SIGNATURES

               After reasonable inquiry and to the best of its knowledge and
belief, the undersigned certifies that the information set forth in this
statement is true, complete and correct.

                                    SINGAPORE TELECOMMUNICATIONS LIMITED


                                    By: /s/ Hoh Wing Chee
                                       -----------------------------------------
                                       Name: Hoh Wing Chee
                                       Title: VP (International Network)

Dated: November 11, 1999

                                    TEMASEK HOLDINGS (PRIVATE) LIMITED


                                    By: /s/ Ong Wen Wendy
                                       -----------------------------------------
                                       Name: Ong Wen Wendy (Ms.)
                                       Title: Vice President/
                                              Company Secretary

Dated: November 11, 1999
<PAGE>

                                                                               9


                                  EXHIBIT INDEX

               Exhibit I in the Exhibit Index is amended as follows:


Exhibit I             Joint Filing Agreement dated November 11,
                      1999


                                    EXHIBIT I

                             JOINT FILING AGREEMENT

               In accordance with Rule 13d-1(k) under the Securities Exchange
Act of 1934, as amended, the persons named below agree to the joint filing on
behalf of each of them of a statement on Schedule 13D dated November 11, 1999
with respect to the Common Stock, par value $.01 per share, of American Mobile
Satellite Corporation, a Delaware corporation. This Joint Filing Agreement shall
be included as an Exhibit to such joint filing. In evidence thereof each of the
undersigned, being duly authorized, hereby executes this Agreement this 11th day
of November 1999.

                                    SINGAPORE TELECOMMUNICATIONS LIMITED


                                    By: /s/ Hoh Wing Chee
                                       -----------------------------------------
                                       Name: Hoh Wing Chee
                                       Title: VP (International Network)


                                    TEMASEK HOLDINGS (PRIVATE) LIMITED


                                    By: /s/ Ong Wen Wendy
                                       -----------------------------------------
                                       Name: Ong Wen Wendy (Ms.)
                                       Title: Vice President/
                                              Company Secretary


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