ORBITAL SCIENCES CORP /DE/
10-Q, 1995-11-14
GUIDED MISSILES & SPACE VEHICLES & PARTS
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               SECURITIES AND EXCHANGE COMMISSION
                     Washington, D.C.  20549
                                
                                
                            FORM 10-Q
                                
       Quarterly Report Pursuant to Section 13 or 15(d) of
               the Securities Exchange Act of 1934
                                
                                
                      For the quarter ended
                                
                       September 30, 1995
                                
                                
                  ORBITAL SCIENCES CORPORATION
                                
                                
                 Commission file number 0-18287
                                
                                
          Delaware                           06-1209561
  (State of Incorporation)               (IRS Identification
                                               number)
                                       
  21700 Atlantic Boulevard                        
   Dulles, Virginia 20166                  (703) 406-5000
    (Address of principal                (Telephone number)
     executive offices)
                                       
                                
                                
The registrant has (1) 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, and (2) has been subject to such filing
               requirements for the past 90 days.
                                
 As of November 9, 1995,  22,693,669 shares of the registrant's
                 common stock were outstanding.


          PART 1
  FINANCIAL INFORMATION
ITEM 1.  FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
ORBITAL SCIENCES CORPORATION
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited; in thousands, except share data)
<S>                                                                            <C>             <C>
       A S S E T S                                                             
                                                                                September 30,    December 31,
                                                                                     1995            1994
CURRENT ASSETS:
          Cash and cash equivalents                                                   $11,200         $21,156
          Short-term investments, at market                                            32,697          12,426
          Receivables, net                                                             89,710          94,236
          Inventories, net                                                             25,980          26,098
          Deferred income taxes and other assets                                       12,218           5,914
            Total current assets                                                      171,805         159,830

PROPERTY, PLANT AND EQUIPMENT, at cost, less accumulated
    depreciation and amortization of $32,932 and $33,432, respectively                 95,267         102,061

INVESTMENTS IN AFFILIATES, net                                                         67,045          54,721

EXCESS OF PURCHASE PRICE OVER NET ASSETS ACQUIRED,
    less accumulated amortization of $12,177 and $10,042, respectively                 70,517          68,878

DEFERRED INCOME TAXES AND OTHER ASSETS                                                 19,313          17,238

                          TOTAL ASSETS                                               $423,947        $402,728


LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
          Short-term borrowings and current portion of
              long-term obligations                                                    $5,924         $28,160
          Accounts payable                                                             19,132          14,961
          Accrued expenses                                                             26,824          37,439
          Payable to subcontractors                                                     2,071          13,695
          Deferred revenue                                                             20,730          13,272
               Total current liabilities                                               74,681         107,527

LONG-TERM OBLIGATIONS, net of current portion                                          93,833          81,163

DEFERRED INCOME TAXES AND OTHER LIABILITIES                                            16,630          11,992
                          TOTAL LIABILITIES                                           185,144         200,682

COMMITMENTS AND CONTINGENCIES

STOCKHOLDERS' EQUITY:
          Preferred stock, par value $.01; 10,000,000 shares
               authorized, no shares issued or outstanding                                  -               -
          Common stock, par value $.01; 40,000,000 shares authorized,
              22,679,643 and 20,170,196 shares outstanding,
               after deducting 15,735 shares held in treasury                             227             202
          Additional paid-in capital                                                  238,395         201,328
          Unrealized gains (losses) on short-term investments                             (80)           (462)
          Retained earnings                                                               261             978
               Total stockholders' equity                                             238,803         202,046
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                                           $423,947        $402,728


See accompanying notes to condensed consolidated financial statements.
</TABLE>
<TABLE>
<CAPTION>

ORBITAL SCIENCES CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
(Unaudited; in thousands, except share data)



                                                                           Three Months Ended
                                                                              September 30,
                                                                        1995                1994
<S>                                                                    <C>                <C>  

REVENUES                                                                   $79,172          $58,205

COSTS OF GOODS SOLD                                                         57,851           40,891

GROSS PROFIT                                                                21,321           17,314

RESEARCH AND DEVELOPMENT EXPENSES                                            3,512            3,159
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                                12,356           10,184
AMORTIZATION OF EXCESS OF PURCHASE PRICE OVER
        NET ASSETS ACQUIRED                                                    791              567

INCOME FROM OPERATIONS                                                       4,662            3,404


NET INTEREST INCOME (EXPENSE)                                                 (920)            (238)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                                     (596)            (995)

INCOME BEFORE PROVISION FOR INCOME TAXES                                     3,146            2,171

PROVISION FOR INCOME TAXES                                                     944              658

NET INCOME                                                                  $2,202           $1,513



NET INCOME PER COMMON AND COMMON EQUIVALENT SHARE                            $0.10            $0.08


SHARES USED IN COMPUTING NET INCOME
         PER COMMON AND COMMON EQUIVALENT SHARE                         22,986,160       19,213,903



NET INCOME PER COMMON SHARE, ASSUMING FULL DILUTION                          $0.10            $0.08


SHARES USED IN COMPUTING NET INCOME
         PER COMMON SHARE, ASSUMING FULL DILUTION                       26,881,696       23,318,078



See accompanying notes to condensed consolidated financial statements.
</TABLE>
<TABLE>
<CAPTION>

ORBITAL SCIENCES CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
(Unaudited, in thousands, except share data)

                                               
                                                                           Nine Months Ended
                                                                              September 30,
                                                                        1995             1994
<S>                                                                   <C>               <C> 
REVENUES                                                                  $212,102         $156,880

COSTS OF GOODS SOLD                                                        155,145          114,514

GROSS PROFIT                                                                56,957           42,366

RESEARCH AND DEVELOPMENT EXPENSES                                           12,276            9,665
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                                35,063           24,656
AMORTIZATION OF EXCESS OF PURCHASE PRICE OVER
    NET ASSETS ACQUIRED                                                      2,191            1,375

INCOME FROM OPERATIONS                                                       7,427            6,670


NET INTEREST INCOME (EXPENSE)                                               (2,806)             693
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                                     (234)          (1,539)

INCOME BEFORE PROVISION FOR INCOME TAXES
    AND CUMULATIVE EFFECT OF ACCOUNTING CHANGE                               4,387            5,824

PROVISION FOR INCOME TAXES                                                     944            1,575

INCOME BEFORE CUMULATIVE EFFECT
    OF ACCOUNTING CHANGE                                                     3,443            4,249

CUMULATIVE EFFECT OF ACCOUNTING CHANGE                                      (4,160)             --

NET INCOME (LOSS)                                                            ($717)          $4,249



NET INCOME (LOSS) PER COMMON AND COMMON  EQUIVALENT SHARE:
    Income Before Cumulative Effect of Accounting Change                     $0.16            $0.23
    Cumulative Effect of Accounting Change                                   (0.19)             --
                                                                            ($0.03)           $0.23

SHARES USED IN COMPUTING NET INCOME (LOSS)
    PER COMMON AND COMMON EQUIVALENT SHARE                              21,640,635       18,346,929


NET INCOME (LOSS) PER COMMON SHARE, ASSUMING FULL DILUTION
    Income Before Cumulative Effect of Accounting Change                     $0.16            $0.21
    Cumulative Effect of Accounting Change                                   (0.19)             --
                                                                            ($0.03)           $0.21

SHARES USED IN COMPUTING NET INCOME  (LOSS)
    PER COMMON SHARE, ASSUMING FULL DILUTION                            25,536,405       22,452,493


See accompanying notes to condensed consolidated financial statements.
</TABLE>
<TABLE>
<CAPTION>

ORBITAL SCIENCES CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited; in thousands)


                                                                                                    Nine Months Ended
                                                                                                    September 30,
                                                                                                 1995         1994
<S>                                                                                            <C>         <C>           
CASH FLOWS FROM OPERATING ACTIVITIES:
     Net income  (loss)                                                                         ($717)      $4,249
     Adjustments to reconcile net income to net cash provided by
           (used in) operating activities:
                Depreciation and amortization expense                                          13,186        8,455
                Equity in (earnings) losses of affiliates                                         234        1,538
                Cumulative effect of accounting change                                          4,160           --
           Changes in assets and liabilities:
         (Increase) decrease in contract receivables                                           13,852        7,221
         (Increase) decrease in components inventory                                              118         (970)
         (Increase) decrease in other current assets                                           (4,957)      (1,381)
         (Increase) decrease in deposits and other assets                                      (5,701)       3,621
         Increase (decrease) in  payables and  accrued expenses                               (21,725)      (8,671)
         Increase (decrease) in deferred revenue                                                7,667      (18,777)
         Increase (decrease) in deferred income taxes and other                                 4,638          604
         Net cash provided by (used in) operating activities                                   10,756       (4,111)


CASH FLOWS FROM INVESTING ACTIVITIES:
        Capital expenditures                                                                  (16,620)     (18,262)
         Proceeds from sales of fixed assets                                                      125           --
         Purchase of investment securities                                                    (24,199)      (8,916)
         Sale of investment securities                                                          4,310       14,210
         Investments in affiliates                                                            (11,853)     (10,539)
         Payment for business acquisition                                                          --      (40,718)
         Net cash used in investing activities                                                (48,237)     (64,225)


CASH FLOWS FROM FINANCING ACTIVITIES:
     Net short-term borrowings                                                                (22,649)      13,546
     Principal payments on long-term obligations                                               (3,917)        (896)
     Proceeds from issuance of long-term obligations                                           20,000       24,200
     Net proceeds from issuances of common stock                                               34,092        1,276
     Adjustment to recast pooled company's year end                                                --       (1,138)
         Net cash provided by (used in) financing activities                                   27,526       36,988


NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                           (9,956)     (31,348)


CASH AND CASH EQUIVALENTS, beginning of period                                                 21,156       49,458
CASH AND CASH EQUIVALENTS, end of period                                                      $11,200      $18,110


See accompanying notes to condensed consolidated financial statements.
</TABLE>
                  ORBITAL SCIENCES CORPORATION
      NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                   SEPTEMBER 30, 1995 AND 1994
                           (Unaudited)

BASIS OF PRESENTATION
      In  the  opinion of management, the accompanying  unaudited
interim   financial   information   reflects   all   adjustments,
consisting  of normal recurring accruals, necessary  for  a  fair
presentation   thereof.    Certain   information   and   footnote
disclosure normally included in financial statements prepared  in
accordance  with  generally accepted accounting  principles  have
been  condensed  or omitted pursuant to instructions,  rules  and
regulations prescribed by the Securities and Exchange Commission.
Although  the Company believes that the disclosures provided  are
adequate to make the information presented not misleading,  these
unaudited  interim  condensed consolidated  financial  statements
should  be  read  in  conjunction with the  audited  consolidated
financial  statements and the footnotes thereto included  in  the
Company's Annual Report on Form 10-K for the year ended  December
31,  1994.   Operating  results for  the  three-  and  nine-month
periods  ended  September 30, 1995 and 1994 are  not  necessarily
indicative of the results expected for the full year.

Orbital  Sciences  Corporation  is  hereafter  referred   to   as
"Orbital" or the "Company."


     (1)   The Financial Accounting Standards Board recently
     issued Statement of Financial Accounting Standards  No.
     121,  "Accounting  for  the  Impairment  of  Long-Lived
     Assets  and Long-Lived Assets to be Disposed Of" ("SFAS
     121"), which (i) requires that long-lived assets "to be
     held  and  used"  be  reviewed for impairment  whenever
     events  or changes in circumstances indicate  that  the
     carrying  amount  of an asset may not  be  recoverable,
     (ii)  requires that long-lived assets "to  be  disposed
     of" be reported at the lower of carrying amount or fair
     value  less cost to sell, and (iii) provides guidelines
     and  procedures for measuring an impairment  loss  that
     are  significantly  different from existing  guidelines
     and procedures.
     
     The  Company adopted the provisions of SFAS 121  during
     the  quarter ended June 30, 1995.  As a result,  as  of
     January   1,   1995  Orbital  recorded   a   cumulative
     adjustment  for  a  change in accounting  principle  of
     approximately $4.2 million related to the impairment in
     the carrying amount of certain assets to be disposed of
     that supported its orbit transfer vehicle product line.
     
      (2) Inventories
     
     Inventories  consist of components inventory,  work-in-
     process inventory and finished goods inventory and  are
     generally stated at the lower of cost or net realizable
     value    on   a   first-in,   first-out   or   specific
     identification basis.
     
     Components  inventory consists primarily of  components
     and   raw   materials  purchased  to   support   future
     production efforts.  Work-in-process inventory consists
     primarily  of (i) costs incurred under U.S.  Government
     fixed-price   contracts   accounted   for   using   the
     percentage  of completion method of accounting  applied
     on  a  units  of  delivery  basis  and  (ii)  partially
     assembled  commercial products, and generally  includes
     direct  production costs and certain allocated indirect
     costs   (including  an  allocation   of   general   and
     administrative costs).  Work in process  inventory  has
     been reduced by contractual progress payments received.
     Finished  goods  inventory consists of fully  assembled
     commercial products awaiting shipment.
     
     (3)  Excess of Purchase Price Over Net Assets Acquired
     
     During  the  quarter ended September  30,  1995,  as  a
     result  of  obtaining additional information subsequent
     to  the  acquisition  of Fairchild  Space  and  Defense
     Corporation  ("Fairchild")  on  August  11,  1994,  the
     Fairchild  purchase price was reallocated to reflect  a
     more  accurate  valuation  of  assets  and  liabilities
     acquired.   As a result of the reallocation, the  value
     of  net liabilities acquired increased by approximately
     $3,800,000 with a resulting increase in the  excess  of
     purchase price over net assets acquired.
     
     (4)  Investments in Affiliates
     
     The   Company's   majority-owned  subsidiary,   Orbital
     Communications  Corporation  ("OCC"),   and   Teleglobe
     Mobile Partners, an affiliate of Teleglobe Inc., formed
     a partnership, ORBCOMM Global, L.P. ("ORBCOMM Global"),
     formerly  known as ORBCOMM Development Partners,  L.P.,
     for  the  two-phased design, development, construction,
     integration,  test and operation of a  low-Earth  orbit
     satellite communications system (the "ORBCOMM System").
     Pursuant  to  the  terms  of  the  amended  partnership
     agreement, OCC and Teleglobe Mobile Partners  are  each
     50%  general partners in ORBCOMM Global.  Additionally,
     OCC  owns  51%  and 49%, respectively, in ORBCOMM  USA,
     L.P.   ("ORBCOMM   USA")   and  ORBCOMM   International
     Partners,   L.P.  ("ORBCOMM  International")   (ORBCOMM
     Global,  ORBCOMM  USA  and ORBCOMM  International  are,
     collectively,   the   "ORBCOMM   Partnerships"),    two
     partnerships  formed  to  market  the  ORBCOMM  System.
     Teleglobe   Mobile   Partners   owns   49%   and   51%,
     respectively, in the two marketing partnerships.
     
     During  the quarter ended September 30, 1995, Teleglobe
     Mobile  increased  its capital commitments  to  ORBCOMM
     Global  to $85 million, of which $30 million  has  been
     contributed  to  date.  OCC also  increased  its  total
     capital   commitments   to  $75   million,   of   which
     approximately $59 million has been contributed to date.
     
     Orbital  is  the primary supplier of the communications
     satellites,  launch  vehicles,  and  the  U.S.   ground
     tracking  systems  to ORBCOMM Global, and  successfully
     launched  the  first two ORBCOMM System  satellites  in
     April  1995.   Several anomalies initially observed  on
     the  spacecraft have been resolved and, in  July  1995,
     Orbital   successfully  completed  on-orbit  functional
     testing  of the satellites.  With the testing complete,
     ORBCOMM  Global  can  begin  conducting  communications
     testing with customers in actual operating conditions.
     
     Based on its current assessment of the overall business
     prospects of the ORBCOMM Partnerships and  the  ORBCOMM
     System,  the Company currently believes its  investment
     of approximately $67 million in ORBCOMM Global is fully
     recoverable.  If, in the future, implementation of  the
     ORBCOMM  System is significantly delayed, significantly
     restricted or abandoned, the Company may be required to
     expense part or all of its investment.
     
     (5)  Debt
     
     In  June  1995, the Company entered into a $20  million
     fixed-rate unsecured debt financing arrangement with  a
     private  insurance company.  The debt  has  a  six-year
     term and bears interest at 10 1/2% per annum.
     
     In  September 1995, Orbital entered into a  $7  million
     unsecured  line  of credit with an international  bank.
     The line is repayable upon demand and bears interest at
     LIBOR plus 80 basis points, which was approximately  6%
     at  September 30, 1995.  No amounts were outstanding on
     the line at September 30, 1995.
     
     (6)  Common Stock and Income Per Share
     
     In June 1995, the Company completed a private placement
     of  two  million shares of its Common Stock,  receiving
     net   proceeds  of  approximately  $32  million.    The
     Company's shares were placed with various international
     institutional  investors and the private placement  was
     exempt  from registration pursuant to Regulation  S  of
     the Securities Act of 1933, as amended.
     
     Income  per  common  and  common  equivalent  share  is
     calculated using the weighted average number of  common
     and  common equivalent shares, to the extent  dilutive,
     outstanding  during  the periods.   Income  per  common
     share  assuming full dilution is calculated  using  the
     weighted average number of common and common equivalent
     shares  outstanding during the periods plus the effects
     of  an  assumed  conversion of  the  Company's  6  3/4%
     convertible   subordinated  debentures,  after   giving
     effect  to all net income adjustments that would result
     from  the  assumed conversion.  Any reduction  of  less
     than  three  percent  in  the aggregate  has  not  been
     considered dilutive in the calculation and presentation
     of income per common share assuming full dilution.
     
     (7)  Income Taxes
     
     The   Company  has  recorded  its  interim  income  tax
     provision based on estimates of the Company's effective
     tax  rate expected to be applicable for the full fiscal
     year.    Estimated  effective  rates  recorded   during
     interim   periods  may  be  periodically  revised,   if
     necessary, to reflect current estimates.
     
     (8)  Hercules Incorporated
     
     In  November  1988,  Orbital and Hercules  Incorporated
     ("Hercules")  entered into an joint  venture  agreement
     relating  to  the  development and  production  of  the
     Pegasus   space  launch  vehicle  (the  "Joint  Venture
     Agreement").    In  1994,  Alliant  Techsystems,   Inc.
     ("Alliant")  acquired the assets of Hercules  Aerospace
     Company (a wholly owned subsidiary of Hercules) and, in
     connection   therewith,   assumed   the   rights    and
     responsibilities of Hercules with respect to the  Joint
     Venture Agreement.  During the second quarter of  1995,
     Orbital   and   Alliant  replaced  the  Joint   Venture
     Agreement with a joint teaming agreement to provide for
     the  continuation of joint performance on  the  Pegasus
     and  Taurus  space launch vehicle programs (the  "Joint
     Teaming   Agreement").   The  Joint  Teaming  Agreement
     provides, among other things, that Orbital will perform
     as  the  system  prime contractor for all  present  and
     future  Pegasus  and Taurus missions and  Alliant  will
     perform  as  a  solid rocket motor and payload  fairing
     subcontractor to Orbital on the Pegasus program and  as
     a  solid rocket motor subcontractor to Orbital  on  the
     Taurus  program.   As  a  subcontractor,  Alliant  will
     receive firm-fixed prices for its subcontracts and will
     no  longer  share in contract profits and  losses,  but
     will  share  in the costs and benefits associated  with
     certain   defined   outstanding   issues   on   current
     contracts.   The Joint Teaming Agreement will  continue
     through December 31, 2005, unless terminated earlier by
     mutual agreement.
     
     Orbital  and  Alliant  have  also  agreed  to  a  final
     dismissal  with  prejudice of all  present  and  future
     claims  and  litigation related to  the  Joint  Venture
     Agreement, including (i) the January 1994 lawsuit filed
     by   Hercules  against  Orbital  alleging  breaches  of
     certain  representations and warranties by  Orbital  in
     the  1988 stock purchase agreement between Hercules and
     Orbital,  and  (ii)  the  July 1994  lawsuit  filed  by
     Hercules  against Orbital alleging breach of  fiduciary
     duty  and  breach  of contract in the determination  of
     Orbital's  recoverable  costs  pursuant  to  the  Joint
     Venture Agreement.
     
     (9)  Reclassifications
     
     Certain  reclassifications have been made to  the  1994
     condensed consolidated financial statements to  conform
     to the 1995 condensed consolidated  financial statement
     presentation.    The  December  1994   acquisition   of
     Magellan Corporation was recorded using the pooling  of
     interests    method   of   accounting   for    business
     combinations    and,   accordingly,   Orbital's    1994
     historical  financial statements have been restated  to
     reflect this transaction.
     
     (10)  Business Combination
     
     On  August  31, 1995, Orbital signed an agreement  (the
     "Combination   Agreement")   to   acquire    MacDonald,
     Dettwiler  and  Associates  Ltd.  ("MDA"),  a   leading
     supplier  of commercial remote sensing ground stations,
     headquartered  in Vancouver, British Columbia.   During
     its  recently  completed fiscal year  ended  March  31,
     1995,  MDA  reported  pre-tax income  of  approximately
     US$5,500,000  on sales of approximately  US$80,000,000.
     The transaction will be structured as a tax-free merger
     and accounted for as a pooling of interests.

     Pursuant  to the terms of the Combination Agreement,  a
     newly  formed Canadian subsidiary of Orbital will issue
     exchangeable   preferred  shares   (the   "Exchangeable
     Shares")  for  all  of MDA's outstanding  common  stock
     based  on  an exchange ratio to be determined according
     to  the average closing price of Orbital's stock in the
     month  prior to closing.  The Exchangeable Shares  will
     be  exchangeable  on a one-for-one  basis  for  Orbital
     common stock.  The transaction is expected to close  by
     the end of November.
     
ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
               CONDITION AND RESULTS OF OPERATIONS
                                

RESULTS OF OPERATIONS FOR THE THREE- AND NINE-MONTH PERIODS ENDED
SEPTEMBER 30, 1995 AND 1994

Revenues.   Orbital's revenues for the three-month periods  ended
September  30,  1995 and 1994 were $79,172,000  and  $58,205,000,
respectively.  The Company's revenues for the nine-month  periods
ended   September  30,  1995  and  1994  were  $212,102,000   and
$156,880,000, respectively.

Revenues   from  the  Company's  space  launch  vehicle  products
decreased  to $7,521,000 during the 1995 three-month period  from
$17,838,000  during  the comparable 1994  period.   Space  launch
vehicle  revenues were $19,486,000 and $47,599,000 for the  nine-
month  periods  ended September 30, 1995 and 1994,  respectively.
The  significant  decrease  in revenues  during  the  periods  is
attributable  primarily to the continuing effects  of  production
delays  caused by the Company's two failed launches  of  its  new
Pegasus XL launch vehicle in June 1994 and in June 1995.  Orbital
expects total 1995 space launch vehicle revenues to be less  than
1994  as  a  result of the ongoing failure review and  return  to
flight process, although fourth quarter sales are expected to  be
higher  than third quarter sales due to work performed  on  newly
awarded  contracts  and  option exercises  for  Taurus  launches.
Sales  of space launch vehicles to ORBCOMM Global were $4,463,000
and  $3,629,000 for the three-month periods ended  September  30,
1995 and 1994, respectively.

Revenues  from  suborbital launch vehicle products  increased  to
$5,400,000  in  the  1995  three-month  period  as  compared   to
$4,699,000   in  the  1994  period.   Suborbital  revenues   were
$16,891,000  and  $16,325,000 for the  nine-month  periods  ended
September  30,  1995  and 1994, respectively.   While  suborbital
revenues  have decreased significantly during the past few  years
as U.S. Government defense spending has been reduced, the Company
expects 1995 revenues to remain approximately consistent with, or
to  slightly increase from, revenue levels achieved in 1994.  The
increase in 1995 third quarter sales as compared to 1994's  third
quarter sales was the first such increase since 1992.

For the three months ended September 30, 1995, spacecraft systems
revenues  increased to $32,337,000 from $11,043,000 in  the  1994
period,  and  revenues for the nine-month period ended  September
30,  1995 were $61,238,000 as compared to $26,775,000 in the same
period  in  1994.   The increase in spacecraft  system  sales  is
primarily due to additional revenues generated from the Company's
Germantown  operations, acquired in August 1994 (the  "Germantown
Acquisition") and to sales to ORBCOMM Global.  The 1995 and  1994
three-month   periods   included  $19,198,000   and   $3,685,000,
respectively, in sales of MicroStar spacecraft to ORBCOMM Global.
Revenues generated from sales of space sensors and instruments of
$2,028,000  during the 1995 quarter decreased from the comparable
1994  quarter sales of $4,591,000.  Space sensors and instruments
sales were $8,575,000 and $13,363,000 for the 1995 and 1994 nine-
month  periods,  respectively, and are expected to  remain  lower
than 1994 levels throughout 1995.

Revenues  from  defense  electronics and avionics  products  were
approximately  $12,676,000  for  the  three-month  period   ended
September 30, 1995 as compared to $2,651,000 in the 1994  period.
Defense  electronics and avionics products sales were $42,466,000
and   $8,511,000  in  the  1995  and  1994  nine-month   periods,
respectively.   These  products were  acquired  as  part  of  the
Germantown Acquisition and the September 1993 acquisition of  the
Applied Science Operation of The Perkin-Elmer Corporation.

Revenues  from  sales  of  navigation  and  positioning  products
increased to $14,564,000 for the three months ended September 30,
1995  as  compared  to  $8,185,000 for the 1994  period,  and  to
$41,023,000  for  the  nine months ended September  30,  1995  as
compared to $26,738,000 for the 1994 period, primarily due  to  a
substantial increase in unit sales offset, in part, by lower unit
prices  for  GPS navigators.  The Company expects navigation  and
positioning products sales to continue to increase in the  fourth
quarter of 1995.

Revenues  from the Company's newly established Advanced  Projects
Group  were  $2,261,000  during the third  quarter  of  1995  and
$11,665,000 for the first nine months of 1995 as a result of work
performed under a cooperative agreement with NASA awarded earlier
in  1995  for  the  development of a new  small  reusable  launch
vehicle  and  under  contract to the U.S.  Government's  Advanced
Research  Projects Agency for the preliminary  design  of  a  new
advanced unmanned, long-duration, high-flying aircraft.

Gross  Profit.   Gross  profit depends on a  number  of  factors,
including the Company's mix of contract types and costs  incurred
thereon  in  relation  to estimated costs.  The  Company's  gross
profit  for the three-month periods ended September 30, 1995  and
1994 was $21,321,000 and $17,314,000, respectively.  Gross margin
for  the nine-month periods ended September 30, 1995 and 1994 was
$56,957,000  and $42,366,000, respectively.  Gross profit  margin
as  a  percentage  of sales for those periods  was  approximately
26.9% and 29.7%, respectively, and 26.9% and 27.0%, respectively.
The  decreasing  gross  profit margin as a  percentage  of  sales
during  1995 is primarily attributable to cost increases  on  the
Pegasus program as a result of the Pegasus XL failures in June of
1994 and 1995.  The Company believes that its gross profit margin
for  the remainder of 1995 will increase slightly as compared  to
1994 and the first nine months of 1995.

Research  and  Development  Expenses.  Research  and  development
expenses  represent  Orbital's  self-funded  product  development
activities,   and  exclude  direct  customer-funded  development.
Research and development expenses during the three-month  periods
ended September 30, 1995 and 1994 were $3,512,000 and $3,159,000,
respectively.  Research and development expenses for the 1995 and
1994   nine-month   periods  were  $12,276,000  and   $9,665,000,
respectively.  Research and development expenses in  1995  relate
primarily  to  the  development of  new  or  improved  navigation
products  and  development  efforts  on  the  Company's   Pegasus
program,  and  include estimated expenses  related  to  the  1995
Pegasus  XL  failure.   The  Company  expects  its  research  and
development  expenditures for the rest of 1995 to  be  consistent
with 1994 expenditures.

Selling, General and Administrative Expenses.   Selling,  general
and  administrative  expenses include  the  costs  of  marketing,
advertising, promotional and other selling expenses  as  well  as
the  costs  of the finance, administrative and general management
functions  of  the Company.  Selling, general and  administrative
expenses  for the three months ended September 30, 1995 and  1994
were $12,356,000 (or 15.6% of revenues) and $10,184,000 (or 17.5%
of  revenues), respectively.  Selling, general and administrative
expenses  for the nine months ended September 30, 1995  and  1994
were $35,063,000 (or 16.5% of revenues) and $24,656,000 (or 15.7%
of revenues), respectively.  The increase in selling, general and
administrative  expenses  during 1995 as  compared  to  1994  was
primarily   attributable  to  substantially  expanded   marketing
efforts related to the Company's ORBCOMM project, various  remote
sensing  systems, and to the Germantown Acquisition.  The Company
expects  selling,  general  and  administrative  expenses  as   a
percentage of revenues during the remainder of 1995 to be in line
with the percentage attained during third quarter of 1995.

Interest  Income and Interest Expense.  Net interest expense  was
$920,000  for  the  three  months ended  September  30,  1995  as
compared  to  net  interest expense of $238,000 during  the  1994
quarter.  Net interest expense for the 1995 nine-month period was
$2,806,000 as compared to $693,000 of net interest income for the
1994 nine-month period.  Interest income for the periods reflects
interest earnings on short-term investments.  Interest expense is
primarily  for outstanding amounts on Orbital's revolving  credit
facility, on the Company's public debentures, on acquisition debt
incurred for the Germantown Acquisition and, in 1995, on  private
debt  issued in June 1995.  Interest expense has been reduced  by
capitalized  interest of $3,769,000 and $3,900,000 for  the  1995
and 1994 nine-month periods, respectively.

Equity  in  Earnings (Losses) of Affiliates.  Equity in  earnings
(losses)   of  affiliates  for  the  three-month  periods   ended
September  30,  1995  and  1994  of  ($596,000)  and  ($995,000),
respectively, and for the nine-month periods ended September  30,
1995  of  ($234,000)  and ($1,539,000), respectively,  represents
elimination of 50% of the profits on sales to ORBCOMM Global,  as
well  as the Company's pro rata share of ORBCOMM Global's current
period earnings and losses.  During the construction phase of the
ORBCOMM   project  and  prior  to  the  commencement  of  planned
operations,  ORBCOMM  Global  is capitalizing  substantially  all
construction-related  costs  and is  expensing  as  incurred  all
selling, general and administrative costs as period costs.

Provision  for Income Taxes.  The Company recorded an income  tax
provision  of  $944,000 and $658,000 for the three-month  periods
ended  September 30, 1995 and 1994, respectively, and  provisions
of  $944,000  and  $1,575,000, respectively, for  the  nine-month
periods  then ended.  The Company records its interim income  tax
provisions based on estimates of the Company's effective tax rate
expected  to  be applicable for the full fiscal year.   Estimated
effective   rates  recorded  during  interim   periods   may   be
periodically revised, if necessary, to reflect current estimates.

At  December 31, 1994, Orbital had approximately $50,000,000  and
$900,000  of  net  operating loss and tax  credit  carryforwards,
respectively,  which are available to reduce  future  income  tax
obligations,  subject  to certain annual  limitations  and  other
restrictions.


LIQUIDITY AND CAPITAL RESOURCES

The  Company's  growth has required substantial capital  to  fund
both  an  expanding  business base and significant  research  and
development  and capital investment expenditures.   Additionally,
the  Company  has  historically made  strategic  acquisitions  of
businesses   and   routinely  evaluates   potential   acquisition
candidates.  The Company expects to continue to pursue  potential
acquisitions  that  it  believes  would  augment  its  marketing,
technical, manufacturing or financial capabilities.  The  Company
has  funded these requirements to date, and expects to  fund  its
requirements in the future, through cash generated by operations,
working  capital  loan facilities, asset-based financings,  joint
venture  arrangements,  and private and public  equity  and  debt
offerings.

During  the quarter ended June 30, 1995, Orbital entered  into  a
$20  million fixed-rate unsecured debt financing arrangement with
a  private insurance company.  The debt has a six-year  term  and
bears  interest  at  10  1/2% per annum.   The  debt  arrangement
restricts the payment of dividends and contains certain covenants
with  respect  to  the  Company's working capital,  fixed  charge
ratio,  leverage ratio and tangible net worth.  Additionally,  in
June  1995,  the  Company completed a private  placement  of  two
million  shares  of its Common Stock, receiving net  proceeds  of
approximately $32 million.  The Company's shares were placed with
various   offshore  institutional  investors  and   the   private
placement  was exempt from registration pursuant to Regulation  S
of  the  Securities  Act of 1933, as amended.   In  August  1994,
Orbital  issued secured notes totaling approximately  $24,200,000
to  eight  financial  institutions,  to  support  the  Germantown
Acquisition.   The  notes  have  an  average  interest  rate   of
approximately 8 3/4% and generally mature on a monthly basis over
a three- to five-year period.

Cash,   cash   equivalents   and  short-term   investments   were
$43,117,000 at September 30, 1995, and the Company had short-term
and  long-term  debt  obligations  outstanding  of  approximately
$99,757,000.  The outstanding debt relates primarily  to  secured
notes  issued  in  connection  with the  Germantown  Acquisition,
unsecured  notes issued in 1995, fixed asset financings  and  the
Company's public debentures.  During the quarter ended  June  30,
1995,   Orbital   converted  approximately  $3,000,000   of   its
convertible  debentures  at  the  request  of  certain  debenture
holders, issuing approximately 209,000 shares of Common Stock.

The  Company's  primary  revolving credit facility  provides  for
total borrowings from an international syndicate of six banks  of
up  to $65,000,000, subject to a defined borrowing base comprised
of  certain contract receivables.  No borrowings were outstanding
under  the  facility  at September 30, 1995,  and  the  available
facility  limit was approximately $25,000,000.  At September  30,
1995,  the average interest rate on outstanding borrowings  under
this  facility was approximately 8%.  Borrowings are  secured  by
contract  receivables  and certain other  assets.   The  facility
restricts the payment of dividends and contains certain covenants
with  respect  to  the  Company's working capital,  fixed  charge
ratio,  leverage  ratio and tangible net worth,  and  expires  in
September 1997.  The Company (or its subsidiaries) also maintains
two  additional, smaller revolving credit facilities, under which
no amounts were outstanding at September 30, 1995.

The  Company's  operations  provided net  cash  of  approximately
$10,756,000  in the nine months ended September  30,  1995.   The
Company  also invested approximately $11,853,000 in  its  ORBCOMM
project and $16,620,000 in capital expenditures related primarily
to  spacecraft  production and test equipment and various  remote
sensing and Earth observation satellite systems.

Orbital's   capital  expenditures  for  1995  are   expected   to
approximate 1994 and 1993 levels, including continued investments
in  space  launch  vehicle and spacecraft production,  test,  and
airborne and ground support equipment.

Orbital  expects to invest up to $15,000,000 in various  ORBIMAGE
remote  sensing  projects.  Orbital also  intends  to  invest  an
additional  $5,000,000  in the ORBCOMM System.   Orbital  expects
that   its  1995  capital  needs  for  its  existing  operations,
including  its  planned $5,000,000 additional investment  in  the
ORBCOMM  project,  will in part be provided by  working  capital,
cash   flows  from  operations,  credit  facilities,  asset-based
financings, customer financings and operating lease arrangements.
Additionally,  as part of a joint venture to be partially  funded
by  NASA  and Rockwell International Corporation, Orbital intends
to  invest at least $73,000,000 in the development of a new small
reusable  launch vehicle, which investment will be required  over
the  next four years, including approximately $5,000,000 in 1995.
Orbital  believes  that it may require additional  equity  and/or
debt financing to fully fund its currently planned operations and
capital  requirements, to meet its potential increased investment
in the ORBCOMM System and to meet its investment requirements for
the new launch vehicle and other potential projects.

On August 31, 1995, Orbital signed an agreement (the "Combination
Agreement")  to acquire MacDonald, Dettwiler and Associates  Ltd.
("MDA"),  a leading supplier of commercial remote sensing  ground
stations,  headquartered in Vancouver, British Columbia.   During
its  recently  completed fiscal year ended March  31,  1995,  MDA
reported pre-tax income of approximately US$5,500,000 on sales of
approximately  US$80,000,000.   Pursuant  to  the  terms  of  the
Combination  Agreement,  a newly formed  Canadian  subsidiary  of
Orbital   will   issue   exchangeable   preferred   shares   (the
"Exchangeable Shares") for all of MDA's outstanding common  stock
based  on  an  exchange ratio to be determined according  to  the
average  closing price of Orbital's stock in the month  prior  to
closing.  The Exchangeable Shares will be exchangeable on a  one-
for-one  basis  for  Orbital common stock.   The  transaction  is
expected to close by the end of November.

                             PART II
                                
                        OTHER INFORMATION
                                
                                
                                
ITEM 1.   LEGAL PROCEEDINGS

          Not applicable.
          
ITEM 2.   CHANGES IN SECURITIES

          Not applicable.
          
ITEM 3.   DEFAULTS UPON SENIOR SECURITIES

          Not applicable.

ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITIES HOLDERS

          Not applicable.
          
ITEM 5.   OTHER INFORMATION

          Not Applicable.

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

          (a)  Exhibits - A complete listing of exhibits required
               is  given  in the Exhibit Index that precedes  the
               exhibits filed with this report.
          
                              (b)  On November 2, 1995, the Company filed a
               report   on   Form  8-K  reporting  the   proposed
               acquisition of MacDonald, Dettwiler and Associates
               Ltd.   On  November  6,  1995  the  Company  filed
               Amendment No. 1 on Form 8-K/A.

                           SIGNATURES
                                
          Pursuant to the requirements 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.

                                   ORBITAL SCIENCES CORPORATION


DATED:   November  14,  1995       By:   /s/  David   W. Thompson
                                      David   W.   Thompson, President
                                      and   Chief   Executive Officer


DATED:   November  14, 1995         By:   /s/  Carlton  B. Crenshaw
                                       Carlton   B.  Crenshaw, Senior
                                       Vice   President   and Principal
                                        Financial Officer





                          EXHIBIT INDEX
                                
                                
     The following exhibits are filed as part of this report.

 Exhibit                         Description
   No.
          
    2     Combination Agreement dated as of August 31, 1995 among
          Orbital Sciences Corporation, 3173623 Canada Inc. and
          MacDonald, Dettwiler and Associates Ltd. (Incorporated
          by reference to Exhibit 2 filed with the Company's
          Report on Form 8-K filed with the Commission on November
          2, 1995).

    3     By-laws of Orbital Sciences Corporation, as amended on
          July 27, 1995 (transmitted herewith).

   10.1   First Amendment, dated as of June 30, 1995, to Note
          Agreement between the Company and The Northwestern
          Mutual Life Insurance Company dated as of June 1, 1995
          (transmitted herewith).

   10.2   Amendment No. 2 to the Credit Agreement dated as of July
          5, 1995 among the Company, Orbital Imaging Corporation
          and Fairchild Space and Defense Corporation, the Banks
          listed therein, Morgan Guaranty Trust Company of New
          York, as Administrative Agent, and J.P. Morgan Delaware,
          as Collateral Agent (transmitted herewith).

   10.3   Amendment No. 3 to the Credit Agreement dated as of
          August 23, 1995 among the Company, Orbital Imaging
          Corporation and Fairchild Space and Defense Corporation,
          the Banks listed therein, Morgan Guaranty Trust Company
          of New York, as Administrative Agent, and J.P. Morgan
          Delaware, as Collateral Agent (transmitted herewith).

    11    Statement re:  Computation of Earnings Per Share
          (transmitted herewith).

    27    Financial Data Schedule (such schedule is furnished for
          the information of the Securities and Exchange
          Commission and is not to be deemed "filed" as part of
          the Form 10-Q, or otherwise subject to the liabilities
          of Section 18 of the Securities Exchange Act of 1934)
          (transmitted herewith).




                                
                             BY-LAWS
                                
                               OF
                                
                  ORBITAL SCIENCES CORPORATION
                                
                                
                                
                            ARTICLE I
                                
          LAW, CERTIFICATE OF INCORPORATION AND BY-LAWS

     Section  1.1    These by-laws are subject to the certificate
of   incorporation  of  the  corporation.   In   these   by-laws,
references  to law, the certificate of incorporation and  by-laws
mean  the law, the provisions of the certificate of incorporation
and the by-laws as from time to time are in effect.


                           ARTICLE II
                                
                          STOCKHOLDERS

     Section  2.1     Annual  Meeting.   The  annual  meeting  of
stockholders  shall be held on such date and  time  as  shall  be
designated from time to time by the board of directors and stated
in  the  notice of the meeting, at which meeting the stockholders
shall elect a board of directors and transact such other business
as  may  be  required by law or these by-laws or as may  properly
come before the meeting.

     Section  2.2    Special Meeting.  A special meeting  of  the
stockholders may be called at any time by the chairman,  if  any,
or the president.  A special meeting of the stockholders shall be
called  by  the secretary, or in the case of the death,  absence,
incapacity or refusal of the secretary, by an assistant secretary
or  some  other  officer, upon application of a majority  of  the
directors, which application shall state the purpose or  purposes
of  the  meeting.  Any call for a meeting shall state the  place,
date, hour, and purposes of the meeting.

     Section  2.3     Place of Meeting.  A meeting of  the  stock
holders  for  the election of directors or for any other  purpose
shall  be  held  at  such place within or without  the  State  of
Delaware  as may be determined from time to time by the chairman,
if  any,  the president or the board of directors.  Any adjourned
session of any meeting of the stockholders shall be held  at  the
place  of the adjourned session or at such other place as may  be
designated in the vote of adjournment.

     Section  2.4     Notice  of Meetings.  Except  as  otherwise
provided by law, a written notice of each meeting of stockholders
stating  the place, day and hour thereof and, in the  case  of  a
special  meeting, the purposes for which the meeting  is  called,
shall  be given not less than ten nor more than sixty days before
the  meeting,  to each stockholder entitled to vote  thereat,  by
leaving  such notice with him or at his residence or usual  place
of  business,  or  by  depositing it in the United  States  mail,
postage prepaid, and addressed to such stockholder at his address
as  it  appears in the records of the corporation.   Such  notice
shall be given by the secretary or by a person designated by  the
board  of directors, or in the case of a special meeting  by  the
officer  calling the meeting.  Notice of an adjourned meeting  of
stockholders need not be given if the time and place thereof  are
announced  at  the  meeting at which the adjournment  was  taken,
except that if the adjournment is for more than thirty days or if
after  the adjournment a new record date is set for the adjourned
meeting,  notice of any such adjourned meeting shall be given  in
the  manner  heretofore described.  No notice of any  meeting  of
stockholders or any adjourned session thereof need be given to  a
stockholder  if  a written waiver of notice, executed  before  or
after  the meeting or such adjourned session by such stockholder,
is  filed  with the records of the meeting or if the  stockholder
attends  such meeting without objecting at the beginning  of  the
meeting to the transaction of any business because the meeting is
not  lawfully  called or convened.  Neither the  business  to  be
transacted  at,  nor  the purpose of, any meeting  of  the  stock
holders or any adjourned session thereof need be specified in any
written waiver of notice.

     Section  2.5    Quorum of Stockholders.  At any  meeting  of
the  stockholders a quorum as to any matter shall  consist  of  a
majority  of the votes entitled to be cast on the matter,  except
where  a larger quorum is required by law, by the certificate  of
incorporation or by these by-laws.  Any meeting may be  adjourned
from  time to time by a majority of the votes properly cast  upon
the question whether or not a quorum is present.  If a quorum  is
present  at an original meeting, a quorum need not be present  at
an  adjourned session of that meeting.  Shares of its  own  stock
belonging  to  the  corporation or to another corporation,  if  a
majority  of  the  shares entitled to vote  in  the  election  of
directors  of  such  other  corporation  is  held,  directly   or
indirectly, by the corporation, shall neither be entitled to vote
nor  be counted for quorum purposes; provided, however, that  the
foregoing  shall not limit the right of any corporation  to  vote
stock, including but not limited to its own stock, held by it  in
a fiduciary capacity.

     Section 2.6    Action by Vote.  When a quorum is present  at
any  meeting, a plurality of the votes properly cast for election
to  any  office shall elect to such office and a majority of  the
votes  properly cast upon any question other than an election  to
an office shall decide the question, except when a larger vote is
required by law, by the certificate of incorporation or by  these
by-laws.   No  ballot shall be required for any  election  unless
requested by a stockholder present or represented at the  meeting
and entitled to vote in the election.

     Section 2.7    Pre-Meeting Notification.  A stockholder  may
propose  to  discuss business, or to introduce a  resolution  for
vote,  at a meeting of stockholders, provided that the nature  of
any  such  business, and the wording of any such  resolution,  is
delivered in writing to the secretary at least thirty days  prior
to  the  date  of  such meeting.  In the event such  business  or
resolution concerns the nomination for election as a director  of
a  person  not  nominated by the corporation, the information  so
delivered to the secretary shall include the name, age,  address,
employment history for the past ten years, and stock ownership in
the   corporation  of  such  person,  together  with  any   other
information that may be required by law.

     Section 2.8    Proxy Representation.  Every stockholder  may
authorize  another person or persons to act for him by  proxy  in
all  matters  in which a stockholder is entitled to  participate,
whether  by  waiving notice of any meeting of  the  stockholders,
objecting  to  or  voting  or  participating  at  a  meeting,  or
expressing  consent  or dissent without a meeting.   Every  proxy
must be signed by the stockholder or by his attorney-in-fact.  No
proxy  shall  be voted or acted upon after three years  from  its
date  unless  such proxy provides for a longer  period.   A  duly
executed  proxy  shall be irrevocable if it  states  that  it  is
irrevocable  and if, and only as long as, it is coupled  with  an
interest  sufficient in law to support an irrevocable  power.   A
proxy  may be made irrevocable regardless of whether the interest
with which it is coupled is an interest in the stock itself or an
interest  in the corporation generally.  The authorization  of  a
proxy  may but need not be limited to specified action; provided,
however, that if a proxy limits its authorization to a meeting or
meetings  of stockholders, unless otherwise specifically provided
such  proxy  shall  entitle the holder thereof  to  vote  at  any
adjourned  session  but  shall  not  be  valid  after  the  final
adjournment thereof.

     Section  2.9    Inspectors.  The board of directors  or  the
person  presiding at a meeting of the stockholders may, but  need
not,  appoint  one  or  more  inspectors  of  election  and   any
substitute  inspectors  to act at the meeting  or  any  adjourned
session  thereof.   Each  inspector,  before  entering  upon  the
discharge  of his duties, shall take and sign an oath  faithfully
to  execute  the duties of inspector at such meeting with  strict
impartiality  and  according to the best  of  his  ability.   The
inspectors, if any, shall determine the number of shares of stock
outstanding  and  the voting power of each, the shares  of  stock
represented  at  the  meeting, the existence  of  a  quorum,  the
validity and effect of proxies, and shall receive votes,  ballots
or  consents,  hear  and determine all challenges  and  questions
arising  in connection with the right to vote, count and tabulate
all votes, ballots or consents, determine the result, and do such
acts  as are proper to conduct the election or vote with fairness
to  all stockholders.  At the request of the person presiding  at
the meeting, the inspectors shall make a report in writing on any
challenge,  question or matter determined by them and  execute  a
certificate of any fact found by them.

     Section  2.10    List of Stockholders.  The secretary  shall
prepare  and  make,  at least ten days before  every  meeting  of
stockholders,  a  complete list of the stockholders  entitled  to
vote  at such meeting, arranged in alphabetical order and showing
the  address  of  each  stockholder  and  the  number  of  shares
registered  in  his  name.  The stock ledger shall  be  the  only
evidence as to who are stockholders entitled to examine such list
or to vote in person or by proxy at such meeting.


                           ARTICLE III
                                
                       BOARD OF DIRECTORS

     Section 3.1    Number.  The number of directors constituting
the whole board shall not be less than one nor more than fifteen.
Within  the  foregoing  limits, the stockholders  at  the  annual
meeting  shall determine the number of directors and shall  elect
the  number  of  directors as determined.  Within  the  foregoing
limits, the number of directors may be increased or decreased  at
any  time  or  from time to time by the stockholders  or  by  the
directors by vote of a majority of the directors then in  office,
provided  that the number may be so decreased only  to  eliminate
vacancies existing by reason of the death, resignation or removal
of one or more directors.

     Section 3.2    Tenure.  Except as otherwise provided by law,
the  certificate of incorporation or these by-laws, each director
shall  hold  office until the next annual meeting and  until  his
successor  is  elected and qualified, or until he  earlier  dies,
resigns, is removed or becomes disqualified.

     Section  3.3     Powers.  The business and  affairs  of  the
corporation  shall be managed by or under the  direction  of  the
board  of  directors which shall have and may  exercise  all  the
powers  of the corporation and do all such lawful acts and things
as  are  not  by law, the certificate of incorporation  or  these
by-laws  directed  or required to be exercised  or  done  by  the
stockholders.

     Section  3.4    Vacancies.  Vacancies and any newly  created
directorships  resulting  from any  increase  in  the  number  of
directors may be filled by vote of the stockholders at a  meeting
called  for that purpose, or by a majority of the directors  then
in  office,  although less than a quorum, or by a sole  remaining
director.   When  one  or more directors shall  resign  from  the
board,  effective at a future date, a majority of  the  directors
then  in  office,  including those who  have  so  tendered  their
resignations, shall have power to fill such vacancy or vacancies,
the  vote  or action thereon to take effect when such resignation
or resignations shall become effective.  The directors shall have
and  may  exercise all their powers notwithstanding the existence
of one or more vacancies, subject to any requirements of law, the
certificate of incorporation or these by-laws as to the number of
directors required for a quorum or for any vote or other action.

     Section  3.5    Committees.  The board of directors may,  by
vote of a majority of the whole board, (a) designate, change  the
membership  of  or  terminate the existence of any  committee  or
committees,  each  committee to consist of one  or  more  of  the
directors;  (b)  designate  one or more  directors  as  alternate
members  of  any  such committee who may replace  any  absent  or
disqualified  member  at any meeting of the  committee;  and  (c)
determine the extent to which each such committee shall have  and
may  exercise  the  powers  of the  board  of  directors  in  the
management  of  the  business  and affairs  of  the  corporation,
including  the power to authorize the seal of the corporation  to
be  affixed  to  all papers which require it and  the  power  and
authority  to declare dividends or to authorize the  issuance  of
stock;  excepting,  however,  such  powers  which  by  law,   the
certificate  of incorporation or these by-laws it  is  prohibited
from  so delegating.  In the absence or disqualification  of  any
member of such committee and his alternate, if any, the member or
members thereof present at any meeting and not disqualified  from
voting,  whether  or not constituting a quorum,  may  unanimously
appoint  another member of the board of directors to act  at  the
meeting  in the place of any such absent or disqualified  member.
Except  as  the  board of directors may otherwise determine,  any
committee  may  make rules for the conduct of its  business,  but
unless  otherwise  provided  by the  board  or  such  rules,  its
business  shall  be conducted as nearly as may  be  in  the  same
manner  as  is  provided  by these by-laws  for  the  conduct  of
business  by the board of directors.  Each committee  shall  keep
regular minutes of its meetings and report the same to the  board
of directors upon request.

     Section  3.6    Regular Meetings.  Regular meetings  of  the
board  of  directors may be held without call or notice  at  such
places within or without the State of Delaware and at such  times
as  the  board  may  from time to time determine,  provided  that
notice   of  the  first  regular  meeting  following   any   such
determination  shall  be given to absent  directors.   A  regular
meeting  of  the  directors may be held without  call  or  notice
immediately after and at the same place as the annual meeting  of
stockholders.

     Section  3.7    Special Meetings.  Special meetings  of  the
board  of  directors may be held at any time  and  at  any  place
within  or without the State of Delaware designated in the notice
of the meeting, when called by the chairman of the board, if any,
the  president,  or  by  one-third  or  more  in  number  of  the
directors, reasonable notice thereof being given to each director
by  the  secretary or by the chairman of the board, if  any,  the
president or any one of the directors calling the meeting.

     Section   3.8      Notice.   It  shall  be  reasonable   and
sufficient notice to a director to send notice by mail  at  least
forty-eight  hours  or  by  telegram at least  twenty-four  hours
before  the  meeting addressed to him at his usual or last  known
business or residence address or to give notice to him in  person
or  by  telephone at least twenty-four hours before the  meeting.
Notice  of  a  meeting need not be given to  any  director  if  a
written  waiver of notice, executed by him before  or  after  the
meeting,  is  filed with the records of the meeting,  or  to  any
director who attends the meeting without protesting prior thereto
or at its commencement the lack of notice to him.  Neither notice
of  a  meeting nor a waiver of a notice need specify the purposes
of the meeting.

     Section  3.9    Quorum.  Except as may be otherwise provided
by law, the certificate of incorporation or these by-laws, at any
meeting  of  the  directors a majority of the directors  then  in
office shall constitute a quorum; a quorum shall not in any  case
be   less  than  one-third  of  the  total  number  of  directors
constituting the whole board.  Any meeting may be adjourned  from
time  to  time by a majority of the votes cast upon the question,
whether  or not a quorum is present, and the meeting may be  held
as adjourned without further notice.

     Section  3.10   Action by Vote.  Except as may be  otherwise
provided  by  law, the certificate of incorporation or  these  by
laws,  when  a  quorum is present at any meeting the  vote  of  a
majority  of the directors present shall be the act of the  board
of directors.
     
     Section  3.11    Action  Without  a  Meeting.   Any   action
required or permitted to be taken at any meeting of the board  of
directors  or a committee thereof may be taken without a  meeting
if  all  the  members of the board or of such  committee  consent
thereto  in writing, and such writing or writings are filed  with
the  records  of the meetings of the board or of such  committee.
Such consent shall be treated for all purposes as the act of  the
board or of such committee.

     Section  3.12    Participation  in  Meetings  by  Conference
Telephone.   Members of the board of directors, or any  committee
designated  by  the board, may participate in a  meeting  of  the
board  or  such  committee  by means of conference  telephone  or
similar  communications  equipment whereby  all  persons  partici
pating in the meeting can hear each other, or by any other  means
permitted  by law.  Such participation shall constitute  presence
in person at such meeting.

     Section 3.13   Compensation.  In the discretion of the board
of  directors,  each  director may be  paid  such  fees  for  his
services  as  director  and  be  reimbursed  for  his  reasonable
expenses incurred in the performance of his duties as director as
the  board of directors from time to time may determine.  Nothing
contained  in  this section shall be construed  to  preclude  any
director  from serving the corporation in any other capacity  and
receiving reasonable compensation therefor.

     Section 3.14   Interested Directors and Officers.

     (a)  No contract or transaction between the corporation and
one or more of its directors or officers, or between the
corporation and any other corporation, partnership, association,
or other organization in which one or more of the corporation's
directors or officers are directors or officers, or have a
financial interest, shall be void or voidable solely of this
reason, or solely because the director or officer is present at
or participates in the meeting of the board or committee thereof
which authorizes the contract or transaction, or solely because
his or their votes are counted for such purpose, if:

           (1)   The  material  facts as to his  relationship  or
interest  and as to the contract or transaction are disclosed  or
are  known  to the board of directors or the committee,  and  the
board  or  committee  in good faith authorizes  the  contract  or
transaction  by  the  affirmative votes  of  a  majority  of  the
disinterested directors, even though the disinterested  directors
be less than a quorum; or

           (2)   The  material  facts as to his  relationship  or
interest  and as to the contract or transaction are disclosed  or
are  known to the stockholders entitled to vote thereon  and  the
contract or transaction is specifically approved in good faith by
vote of the stockholders; or

           (3)   The  contract or transaction is fair as  to  the
corporation  as  of  the  time  it  is  authorized,  approved  or
ratified, by the board of directors, a committee thereof, or  the
stockholders.

     (b)   Common  or  interested directors  may  be  counted  in
determining the presence of a quorum at a meeting of the board of
directors  or of a committee which authorizes such a contract  or
transaction.
                                
                                
                           ARTICLE IV
                                
                       OFFICERS AND AGENTS

     Section 4.1    Enumeration; Qualification.  The officers  of
the  corporation shall be a president, a treasurer,  a  secretary
and  such other officers, if any, as the board of directors  from
time  to  time may in its discretion elect or appoint,  including
without  limitation a chairman of the board,  one  or  more  vice
presidents and a controller.  The corporation may also have  such
agents,  if any, as the board of directors from time to time  may
in its discretion choose.  Any officer may be but none need be  a
director or stockholder.  Any two or more offices may be held  by
the  same  person.  Any officer may be required by the  board  of
directors to secure the faithful performance of his duties to the
corporation  by giving bond in such amount and with  sureties  or
otherwise as the board of directors may determine.

     Section  4.2    Powers.  Subject to law, the certificate  of
incorporation  and  the other provisions of these  by-laws,  each
officer  shall have, in addition to the duties and powers  herein
set forth, such duties and powers as are commonly incident to his
office  and  such additional duties and powers as  the  board  of
directors may from time to time designate.

     Section 4.3    Election.  The officers may be elected by the
board  of  directors at their first meeting following the  annual
meeting of the stockholders or at any other time.  At any time or
from time to time the directors may delegate to any officer their
power to elect or appoint any other officer or any agents.

     Section 4.4    Tenure.  Each officer shall hold office until
the  first meeting of the board of directors following  the  next
annual  meeting  of  the stockholders and  until  his  respective
successor  is chosen and qualified unless a shorter period  shall
have  been specified by the terms of his election or appointment,
or  in  each  case until he earlier dies, resigns, is removed  or
becomes  disqualified.  Each agent shall retain his authority  at
the  pleasure  of the directors, or the officer by  whom  he  was
appointed  or  by  the  officer who then holds  agent  appointive
power.

     Section 4.5    Chairman of the Board of Directors, President
and  Vice  Presidents.  The chairman of the board, if any,  shall
have  such duties and powers as shall be designated from time  to
time  by  the board of directors.  Unless the board of  directors
otherwise  specifies, the chairman of the board, or if  there  is
none the chief executive officer, shall preside, or designate the
person who shall preside, at all meetings of the stockholders and
of the board of directors.

     Unless  the  board  of  directors otherwise  specifies,  the
president  shall be the chief executive officer  and  shall  have
direct charge of all business operations of the corporation  and,
subject  to  the  control of the directors,  shall  have  general
charge and supervision of the business of the corporation.

     Any  vice  presidents shall have such duties and  powers  as
shall  be  set  forth in these by-laws or as shall be  designated
from time to time by the board of directors or by the president.

     Section 4.6    Treasurer and Assistant Treasurers.  The
treasurer shall be in charge of the corporation's funds and
valuable papers, and shall have such other duties and powers as
may be designated from time to time by the board of directors or
by the president.  If no controller is elected, the treasurer
shall also have the duties and powers of the controller.
[Amended July 27, 1995.]
           Any  assistant  treasurer shall have such  duties  and
powers  as shall be designated from time to time by the board  of
directors, the president or the treasurer.
     
     Section 4.7    Controller and Assistant Controllers.   If  a
controller  is  elected,  the  controller  shall  be  the   chief
accounting officer of the corporation and shall be in  charge  of
its   books  of  account  and  accounting  records,  and  of  its
accounting  procedures.  The controller  shall  have  such  other
duties  and powers as may be designated from time to time by  the
board of directors, the president or the treasurer.

     Any  assistant controllers shall have such duties and powers
as  shall  be  designated  from time to  time  by  the  board  of
directors, the president, the treasurer or the controller.

     Section  4.8     Secretary and Assistant  Secretaries.   The
secretary  shall  record all proceedings of the stockholders,  of
the  board  of  directors  and  of committees  of  the  board  of
directors  in  a book or series of books to be kept therefor  and
shall file therein all actions by written consent of stockholders
or  directors.  In the absence of the secretary from any meeting,
an  assistant secretary, or if there be none or he is  absent,  a
temporary  secretary  chosen at the  meeting,  shall  record  the
proceedings thereof.  Unless a transfer agent has been  appointed
the  secretary  shall  keep or cause to be  kept  the  stock  and
transfer  records  of the corporation, which  shall  contain  the
names and record addresses of all stockholders and the number  of
shares registered in the name of each stockholder.  The secretary
shall have such other duties and powers as may from time to  time
be designated by the board of directors or the president.

     Any  assistant secretaries shall have such duties and powers
as  shall  be  designated  from time to  time  by  the  board  of
directors, the president or the secretary.
     
     
                            ARTICLE V
                                
                    RESIGNATIONS AND REMOVALS

     Section  5.1     Any director or officer may resign  at  any
time by delivering his resignation in writing to the chairman  of
the  board,  if  any, the president, or the  secretary  or  to  a
meeting  of  the board of directors.  Such resignation  shall  be
effective upon receipt unless specified to be effective  at  some
other time, and without in either case the necessity of its being
accepted  unless  the  resignation shall so  state.   A  director
(including a person elected by directors to fill a vacancy on the
board)  may be removed from office with or without cause  by  the
vote  of  the  holders  of a majority of the  shares  issued  and
outstanding  and entitled to vote in the election  of  directors.
The  board of directors may at any time remove any officer either
with  or  without cause, and may at any time terminate or  modify
the authority of any agent.  No director or officer resigning and
(except  where a right to receive compensation shall be expressly
provided  in  a  duly  authorized  written  agreement  with   the
corporation) no director or officer removed shall have any  right
to  any  compensation as such director or officer for any  period
following his resignation or removal, or any right to damages  on
account of such removal, whether his compensation be by the month
or  by  the  year  or  otherwise;  unless,  in  the  case  of   a
resignation, the directors, or, in the case of removal, the  body
acting  on the removal, shall in their or its discretion  provide
for compensation.


                           ARTICLE VI
                                
                            VACANCIES

     Section  6.1     If  the  office of  the  president  or  the
treasurer  or  the  secretary becomes vacant, the  directors  may
elect a successor by vote of a majority of the directors then  in
office.   If the office of any other officer becomes vacant,  any
person  or  body empowered to elect or appoint that  officer  may
choose  a  successor.  Each such successor shall hold office  for
the  unexpired  term,  and  in the case  of  the  president,  the
treasurer  and  the secretary until his successor is  chosen  and
qualified  or  in  each case until he earlier dies,  resigns,  is
removed  or  becomes disqualified.  Any vacancy of a directorship
shall be filled as specified in Section 3.4 of these by-laws.


                           ARTICLE VII
                                
                          CAPITAL STOCK

     Section  7.1    Stock Certificates.  Each stockholder  shall
be entitled to a certificate stating the number and the class and
the designation of the series, if any, of the shares held by him,
in  such form as shall, in conformity to law, the certificate  of
incorporation and the by-laws, be prescribed from time to time by
the  board of directors.  Such certificate shall be signed by the
chairman  of  the  board,  if any, or the  president  or  a  vice
president  and by the treasurer or an assistant treasurer  or  by
the  secretary  or an assistant secretary.  Any  or  all  of  the
signatures  on the certificate may be a facsimile.   In  case  an
officer,  transfer agent, or registrar who has  signed  or  whose
facsimile  signature  has been placed on such  certificate  shall
have  ceased  to  be such officer, transfer agent,  or  registrar
before  such  certificate is issued, it  may  be  issued  by  the
corporation  with  the same effect as if he  were  such  officer,
transfer agent, or registrar at the time of its issue.

     Section 7.2    Loss of Certificates.  In case of the alleged
theft, loss, destruction or mutilation of a certificate of stock,
a duplicate certificate may be issued in place thereof, upon such
terms,  including receipt of a bond sufficient to  indemnify  the
corporation against any claim on account thereof, as the board of
directors may prescribe.
                          ARTICLE VIII
                                
                   TRANSFER OF SHARES OF STOCK

     Section   8.1      Transfer  on  Books.   Subject   to   the
restrictions,  if any, stated or noted on the stock  certificate,
shares  of  stock  may  be  transferred  on  the  books  of   the
corporation  by the surrender to the corporation or its  transfer
agent   of   the  certificate  therefor  properly   endorsed   or
accompanied  by  a  written  assignment  and  power  of  attorney
properly  executed, with necessary transfer stamps  affixed,  and
with such proof of the authenticity of signature as the board  of
directors or the transfer agent of the corporation may reasonably
require.   Except  as  may  be otherwise  required  by  law,  the
certificate  of  incorporation or these by-laws, the  corporation
shall be entitled to treat the record holder of stock as shown on
its  books as the owner of such stock for all purposes, including
the  payment of dividends and the right to receive notice and  to
vote  or to give any consent with respect thereto and to be  held
liable for such calls and assessments, if any, as may lawfully be
made  thereon,  regardless  of  any  transfer,  pledge  or  other
disposition  of  such stock until the shares have  been  properly
transferred on the books of the corporation.

     It  shall  be  the duty of each stockholder  to  notify  the
corporation of his post office address.

     Section  8.2    Record Date and Closing Transfer Books.   In
order   that  the  corporation  may  determine  the  stockholders
entitled  to  notice of or to vote at any meeting of stockholders
or  any  adjournment thereof, or to express consent to  corporate
action  in  writing  without a meeting, or  entitled  to  receive
payment of any dividend or other distribution or allotment of any
rights,  or  entitled to exercise any rights in  respect  of  any
change, conversion or exchange of stock or for the purpose of any
other  lawful action, the board of directors may fix, in advance,
a  record date, which shall not be more than sixty nor less  than
ten days (or such longer period as may be required by law) before
the  date of such meeting, nor more than sixty days prior to  any
other action.

     If no record date is fixed:

     (a)   The  record date for determining stockholders entitled
to  notice of or to vote at a meeting of stockholders shall be at
the  close of business on the day next preceding the day on which
notice  is  given,  or,  if notice is waived,  at  the  close  of
business  on the day next preceding the day on which the  meeting
is held.

     (b)   The  record date for determining stockholders entitled
to  express  consent  to corporate action in  writing  without  a
meeting,  when  no  prior action by the  board  of  directors  is
necessary, shall be the day on which the first written consent is
expressed.
     
     (c)   The  record date for determining stockholders for  any
other  purpose shall be at the close of business on  the  day  on
which  the  board  of  directors adopts the  resolution  relating
thereto.
     
     A determination of stockholders of record entitled to notice
of  or  to vote at a meeting of stockholders shall apply  to  any
adjournment of the meeting; provided, however, that the board  of
directors may fix a new record date for the adjourned meeting.


                           ARTICLE XI
                                
                         CORPORATE SEAL

     Section  9.1    Subject to alteration by the directors,  the
seal  of  the corporation shall consist of a flat-faced  circular
die  with the word "Delaware" and the name of the corporation cut
or  engraved  thereon, together with such other words,  dates  or
images as may be approved from time to time by the directors.

                                
                            ARTICLE X
                                
                       EXECUTION OF PAPERS

     Section 10.1   Except as the board of directors may
generally or in particular cases authorize the execution thereof
in some other manner, all deeds, leases, transfers, contracts,
bonds, notes, checks, drafts or other obligations made, accepted
or endorsed by the corporation shall be signed by the chairman of
the board, if any, the president, a vice president or the
treasurer.


                           ARTICLE XI
                                
                           FISCAL YEAR

     Section 11.1   The fiscal year of the corporation shall  end
on the 31st day of December of each year.

                                
                           ARTICLE XII
                                
                           AMENDMENTS

     Section  12.1    These  by-laws may be adopted,  amended  or
repealed by vote of a majority of the directors then in office or
by  vote of a majority of the stock then outstanding and entitled
to vote.  Any by-law, whether adopted, amended or repealed by the
stockholders  or directors, may be amended or reinstated  by  the
stockholders or directors.



                             1ST AMENDMENT
                                   
                       Dated as of June 30, 1995
                                   
                                  TO
                                   
                            NOTE AGREEMENT
                                   
                       Dated as of June 1, 1995

THIS AMENDMENT, dated as of June 30, 1995 is entered into between
Orbital Sciences Corporation, a Delaware corporation (the "Company")
and The Northwestern Mutual Life Insurance Company (the "Purchaser").

                               RECITALS

The Company and the Purchaser are parties to a Note Agreement dated as
of June 1, 1995 (the "Note Agreement"). The parties now desire to amend
the Note Agreement in certain respects so as to adjust certain
financial tests. In addition, the Company is in default with respect to
one covenant under the Note Agreement and has requested that the
Purchaser grant a waiver with respect to such default;

NOW, THEREFORE, in consideration of the premises and the mutual
agreements of the parties herein contained, the parties agree as
follows:

                        ARTICLE I - AMENDMENTS

1.1 Section 5.8. Section 5.8 of the Note Agreement is amended to read
in its entirety as follows:

Section 5.8 Fixed Charges Coverage Ratio. The Company will at all times
keep and maintain the Fixed Charges Coverage Ratio at not less than:

          DURING THE PERIOD         MINIMUM RATIO LEVEL
          
          Closing Date through      1.25 to 1.00
          March 31, 1996
          
          April 1, 1996 and         1.50 to 1.00;
          thereafter

provided, however that (i) at all times on and before December 31,
1995, the Fixed Charges Coverage Ratio shall be calculated to take into
effect the FAS Adjustment and (ii) at all times on and before March 31,
1996, the Fixed Charge Coverage Test shall be calculated to take into
effect the Pegasus Adjustment.

1.2.  Definitions. The following two new definitions shall be inserted
into Section 8. Interpretation of Agreement: Definitions in their
appropriate alphabetical order.

"FAS Adjustment" shall mean an amount equal to the amount set forth in
the financial statements of the Company as at March 31, 1995 (as
restated) to reflect charges resulting from the Company's revaluation
of assets relating to its Transport Orbit Stage a/k/a Orbit Transfer
Stage line of business in connection with the Company's adoption of
Financial Accounting Standard 121, but in no event shall such amount
exceed $4,200,000. The FAS Adjustment shall be excluded from the
calculatlon of Adjusted Consolidated Operating Earnings for the period
set forth in Section 5.8.

"Pegasus Adjustment" shall mean an amount equal to the amount recorded
in the Company's financial statements as at June 30, 1995 to reflect
additional costs associated with and reserves taken in connection with
the failed launch of the Pegasus XL Space Launch Vehicle on June 21,
1995, but in no event shall such amount exceed $4,500,000. The Pegasus
Adjustment shall be excluded from the calculation of Adjusted
Consolidated Operating Earnings for the period set forth in Section
5.8.

                          ARTICLE ll - WAIVER

Purchaser hereby waives through June 30, 1995 (but not after such date)
any noncompliance by the Company with the provisions of Section 5.8 of
the Note Agreement.

                       ARTICLE lll - WARRANTIES

To induce the Purchaser to enter into this Amendment, the Company (i)
warrants to the Purchaser that no Default or Event of Default exists
which will not be cured by this Amendment becoming effective and (ii)
restates and reaffirms all of the representations and warranties set
forth in Exhibit B to the Note Agreement.

                         ARTICLE IV - GENERAL

4.1 Effectiveness. This Amendment shall become effective as of the date
hereof upon receipt by the Purchaser of a counterpart of this Amendment
executed by both parties.

4.2 Counterparts. This Amendment may be executed in any number of
counterparts and by the different parties on separate counterparts and
each such counterpart shall be deemed to be an original, but all such
counterparts shall together constitute but one and the same Amendment.

4.3 Reaffirmation. As herein amended, the Note Agreement shall remain
in full force and effect and is hereby ratified, approved and confirmed
in all respects.

4.4 Definitions and References. Terms used but not otherwise defined
herein are used herein as defined in the Note Agreement.

4.5 References. On and after the effective date hereof, each reference
to the Note Agreement therein and in any and all agreements,
instruments, or other documents executed pursuant to or in connection
with the Note Agreement shall be deemed to mean the Note Agreement as
amended hereby.

4.6 Successors and Assigns. This Amendment shall be binding upon the
Company and the Purchaser and their respective successors and assigns,
and shall inure to the benefit of the Company and the Purchaser and the
respective successors and assigns of the Purchaser.

4.7 Sole Holder. Purchaser is the sole Holder of the Notes and has the
power and authority to execute this Amendment pursuant to Section 7 of
the Note Agreement.

Executed by and between the parties as of the date set forth above.

                              ORBITAL SCIENCES CORPORATION
                              
                                /s/ Kenneth H. Sunshine
                              
                              By:  Kenneth H. Sunshine
                              Its:  Treasurer
                              
                              THE NORTHWESTERN MUTUAL LIFE
                              INSURANCE COMPANY
                              
                                 /s/  A. Kipp Koester
                              By:  A. Kipp Koester
                              Its:  Vice President







            AMENDMENT NO. 2 TO CREDIT AGREEMENT


          AMENDMENT No. 2 dated as of July 5, 1995 among
ORBITAL SCIENCES CORPORATION (the "Company"), ORBITAL
IMAGING CORPORATION and FAIRCHILD SPACE AND DEFENSE
CORPORATION, the BANKS listed on the signature pages hereof,
MORGAN GUARANTY TRUST COMPANY OF NEW YORK, as Administrative
Agent (the "Administrative Agent"), and J.P. MORGAN
DELAWARE, as Collateral Agent.


                   W I T N E S S E T H :


          WHEREAS, the parties hereto have heretofore
entered into an Amended and Restated Credit and
Reimbursement Agreement dated as of September 27, 1994 (as
amended from time to time, the "Agreement"); and

          WHEREAS, the parties hereto desire to amend the
Agreement as set forth below;

          NOW, THEREFORE, the parties hereto agree as
follows:

          SECTION 1.  Definitions; References.  Unless
otherwise specifically defined herein, each term used herein
which is defined in the Agreement shall have the meaning
assigned to such term in the Agreement.  Each reference to
"hereof", "hereunder", "herein" and "hereby" and each other
similar reference and each reference to "this Agreement" and
each other similar reference contained in the Agreement
shall from and after the date hereof refer to the Agreement
as amended hereby.

          SECTION 2.  Additional Permitted Investment.
Section 5.07 of the Agreement is amended by:

          (i)  deleting the preposition "and" at the end of
clause (d) thereof;

          (ii) renumbering clause (e) thereof as clause (f);
and

         (iii) inserting a new clause (e) immediately
following clause (d) thereof, to read in its entirety as
follows:

          "(e) Investments made by the Company or any of its
     Wholly-Owned Subsidiaries, substantially on the terms
     described by the Company to the Banks in the "Project
     Summary-American Space Lines" dated June, 1995, copies
     of which have been delivered to each of the Banks, in
     an aggregate principal amount not exceeding
     $68,000,000, in any entity or entities through which
     the Company or any of its Wholly-Owned Subsidiaries
     will participate in the development, construction,
     operation and/or marketing of the X-34 small reusable
     launch vehicles; and"

          SECTION 3.  Waiver Under Company Security
Agreement.  The Banks waive (i) compliance by the Company
with the terms of Section 4(H) of the Company Security
Agreement solely to the extent necessary to permit the
Company to novate the Cooperative Agreement effective March
30, 1995 between the Company and the National Aeronautics
and Space Administration and (ii) any Default arising under
the Credit Agreement by reason of noncompliance by the
Company with such Section solely as a result of such
novation.  Other than as specifically provided herein, this
Section shall not operate as a waiver of any right, remedy,
power or privilege of the Banks under any Financing Document
or of any other term or condition of any Financing Document.

          SECTION 4.  New York Law.  This Amendment shall be
governed by and construed in accordance with the laws of the
State of New York.

          SECTION 5.  Counterparts; Effectiveness.  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.  This Amendment shall become effective upon
receipt by the Administrative Agent of duly executed
counterparts hereof signed by the Borrowers and the Required
Banks (or, in the case of any party as to which an executed
counterpart shall not have been received, the Administrative
Agent shall have received telegraphic, telex or other
written confirmation from such party of execution of a
counterpart hereof by such party).

          IN WITNESS WHEREOF, the parties hereto have caused
this Amendment to be duly executed as of the date first
above written.


                         ORBITAL SCIENCES CORPORATION



                         By /s/ Carlton B. Crenshaw
                            Title: Sr. Vice President\
                                   Finance & Administration
                                   and Treasurer


                         ORBITAL IMAGING CORPORATION



                           By /s/ Carlton B. Crenshaw
                              Title: Chief Financial Officer
                                     and Treasurer


                         FAIRCHILD SPACE AND DEFENSE CORPORATION



                           By /s/ Carlton B. Crenshaw
                              Title: Treasurer


                         MORGAN GUARANTY TRUST COMPANY
                           OF NEW YORK



                         By /s/ Kevin J. O'Brien
                            Title: Vice President


                         THE BANK OF NOVA SCOTIA



                         By /s/ J.R. Trimble
                            Title: Senior Relationship
                                   Manager


                         SIGNET BANK/VIRGINIA



                         By /s/ Ronald K. Hobson
                            Title: Vice President


                         NATIONSBANK, N.A.



                         By /s/ James W. Gaittens
                            Title: Vice President


                         THE BANK OF TOKYO TRUST COMPANY



                         By
                            Title:


                         THE DAIWA BANK, LIMITED



                         By /s/ Keith Rauschenberg
                            Title: Vice President



                         By /s/ Louanne Baily
                            Title: Vice President
                                   and Manager







            AMENDMENT NO. 3 TO CREDIT AGREEMENT


          AMENDMENT No. 3 dated as of August 23, 1995 among
ORBITAL SCIENCES CORPORATION (the "Company"), ORBITAL
IMAGING CORPORATION and FAIRCHILD SPACE AND DEFENSE
CORPORATION, the BANKS listed on the signature pages hereof,
MORGAN GUARANTY TRUST COMPANY OF NEW YORK, as Administrative
Agent (the "Administrative Agent"), and J.P. MORGAN
DELAWARE, as Collateral Agent.


                   W I T N E S S E T H :


          WHEREAS, the parties hereto have heretofore
entered into an Amended and Restated Credit and
Reimbursement Agreement dated as of September 27, 1994 (as
amended from time to time, the "Agreement"); and

          WHEREAS, the parties hereto desire to amend the
Agreement as set forth below;

          NOW, THEREFORE, the parties hereto agree as
follows:

          SECTION 1.  Definitions; References.  Unless
otherwise specifically defined herein, each term used herein
that is defined in the Agreement shall have the meaning
assigned to such term in the Agreement.  Each reference to
"hereof", "hereunder", "herein" and "hereby" and each other
similar reference and each reference to "this Agreement" and
each other similar reference contained in the Agreement
shall from and after the date hereof refer to the Agreement
as amended hereby.

          SECTION 2. Decrease in the Minimum Consolidated
Fixed Charges Ratio.  Section 5.10 of the Agreement is
amended to read in its entirety as follows:

          SECTION 5.10.  Consolidated Fixed Charge Ratio.
At the last day of any fiscal quarter, the ratio of Earnings
Available for Fixed Charges to Consolidated Fixed Charges
for the four consecutive fiscal quarters then ended will not
be less than 1.10 to 1.  For purposes of this Section 5.10,
the fiscal quarters of the Company ended June 30, 1994 and
June 30, 1995, respectively, shall be excluded from any
determination of any period of four consecutive fiscal
quarters (e.g. the fiscal quarters ended March 31, 1994,
September 30, 1994, December 31, 1994 and March 31, 1995)
shall constitute four consecutive fiscal quarters for
purposes of this Section 5.10).

          SECTION 3.  Additional Permitted Investment.
Section 5.07 of the Agreement is amended by:

          (i)  deleting the preposition "and" at the end of
clause (e) thereof;

          (ii) renumbering clause (f) thereof as clause (g);
and

         (iii) inserting a new clause (f) immediately
following clause (e) thereof, to read in its entirety as
follows:

          "(f) Investments made by the Company to acquire
     Macdonald, Dettwiler and Associates Ltd. ("MDA"),
     substantially on the terms described by the Company to
     the Banks in the draft of the Combination Agreement
     with respect to such acquisition, a copy of which has
     been delivered to each of the Banks, up to an amount
     not in excess of the value of 4,800,000 shares of
     common stock of the Company; and"

          SECTION 4.  New York Law.  This Amendment shall be
governed by and construed in accordance with the laws of the
State of New York.

          SECTION 5.  Counterparts; Effectiveness.  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.  This Amendment shall become effective on the
date on which the Administrative Agent  shall have received
(i) duly executed counterparts hereof signed by the
Borrowers and the Required Banks (or, in the case of any
party as to which an executed counterpart shall not have
been received, the Administrative Agent shall have received
telegraphic, telex or other written confirmation from such
party of execution of a counterpart hereof by such party)
and (ii) for the account of each Bank, an amendment fee
equal to 1/8 of 1% of such Bank's Commitment as in effect on
such date.

          IN WITNESS WHEREOF, the parties hereto have caused
this Amendment to be duly executed as of the date first
above written.

                         ORBITAL SCIENCES CORPORATION



                         By /s/ Carlton S. Crenshaw
                            Title: Sr. Vice President/Finance
                                   Administrator and Treasurer


                         ORBITAL IMAGING CORPORATION



                           By /s/ Carlton B. Crenshaw
                              Title: Chief Financial Officer
                                     and Treasurer


                         FAIRCHILD SPACE AND DEFENSE
                           CORPORATION



                           By /s/ Carlton B. Crenshaw
                              Title: Treasurer


                         MORGAN GUARANTY TRUST COMPANY
                           OF NEW YORK



                         By /s/ Kevin J. O'Brien
                            Title: Vice President


                         THE BANK OF NOVA SCOTIA



                         By /s/ J. Alan Edwards
                            Title: Authorized Signatory


                         SIGNET BANK/VIRGINIA



                         By /s/ Ronald K. Hobson
                            Title: Vice President


                         NATIONSBANK, N.A.



                         By /s/ James W. Gaitten
                            Title: Vice President


                         THE BANK OF TOKYO TRUST COMPANY



                         By /s/ J. Andrew Don
                            Title: Vice President


                         THE DAIWA BANK, LIMITED



                         By /s/ Louanne Baily
                            Title: Vice President
                                   and Manager



                         By /s/ R.M. Shehorn
                            Title: SVP & RM MIDWEST


<TABLE>
<CAPTION>      
                                      Exhibit 11.
                               Statement re: Computation
                                 of Earnings Per Share
                                                                                                                          
Three Month Period Ended                  1995                  Nine Month Period Ended                 1995
September 30,                                                   September 30,                             
                                               Assuming                                                         Assuming
                               Primary      Full Dilution                                      Primary       Full Dilution

<S>                           <C>           <C>               <S>                            <C>             <C>
Weighted average of            22,667,006        22,667,006    Weighted average of            21,242,456        21,242,456
 outstanding shares                                             outstanding shares
                                                                                                                          
Common equivalent shares:                                      Common equivalent shares:                                  
Outstanding stock options         319,154           319,038      Outstanding stock options       398,179           398,297
                                                                                                                          
Other potentially dilutive                                     Other potentially dilutive    
securities:                                                     securities:

Convertible debentures                N/A         3,895,652      Convertible debentures              N/A         3,895,652
                                                                                                                          
Shares used in computing                                       Shares used in computing                                   
net income per share           22,986,160        26,881,696    net income per share           21,640,635        25,536,405
                                                                                                                          
Net income                     $2,202,289        $2,202,289    Net income                     ($716,793)        ($716,793)
                                                                                                                          
Adjustments assuming                                           Adjustments assuming full                                  
  full dilution:                                                      dilution:

interest expense, net of              N/A           661,500       interest expense, net of           N/A         1,984,500
  taxes                                                          taxes
                                                                                                                          
Net income, assuming full      $2,202,289        $2,863,789    Net income, assuming full      ($716,793)        $1,267,707
  dilution                                                       dilution
                                                                                                                          
Net income per share                $0.10             $0.11    Net income per share              ($0.03)             $0.05
                                                                                                                          
Dilution percentage                   N/A            -11.2%    Dilution percentage                   N/A           -249.9%
assuming full                                                   assuming full
 dilution (1)                                                    dilution (1)
                                                                                                                          
Net income per share used           $0.10             $0.10    Net income per share used         ($0.03)           ($0.03)
                                                                                                                          
                                                                                                                          
                                                                                                                          
Notes:                                                                                                                    
                                                                                                                          
(1) - Provided that dilution is greater than 3%, the convertible debentures are
considered dilutive in the calculation and presentation of per share data.



</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE 
CONSOLIDATED BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF EARNINGS AT AND 
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 1995 AND IS QUALIFIED IN ITS 
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000820736
<NAME> ORBITAL SCIENCES CORP /DE/
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1994
<PERIOD-START>                              JUL-1-1995
<PERIOD-END>                               SEP-30-1995
<CASH>                                          11,200
<SECURITIES>                                    32,697
<RECEIVABLES>                                   90,277
<ALLOWANCES>                                     (567)
<INVENTORY>                                     25,980
<CURRENT-ASSETS>                               171,805
<PP&E>                                         128,199
<DEPRECIATION>                                (32,932)
<TOTAL-ASSETS>                                 423,947
<CURRENT-LIABILITIES>                           74,681
<BONDS>                                         93,833
<COMMON>                                           227
                                0
                                          0
<OTHER-SE>                                     238,576
<TOTAL-LIABILITY-AND-EQUITY>                   423,947
<SALES>                                         79,172
<TOTAL-REVENUES>                                79,172
<CGS>                                           57,851
<TOTAL-COSTS>                                   57,851
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                    80
<INTEREST-EXPENSE>                               1,247
<INCOME-PRETAX>                                  3,146 
<INCOME-TAX>                                       944 
<INCOME-CONTINUING>                              2,202
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,202
<EPS-PRIMARY>                                      .10
<EPS-DILUTED>                                      .10
        


</TABLE>


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