Exhibit 4.11

                      SECOND AMENDMENT TO CREDIT AGREEMENT


                  SECOND AMENDMENT TO CREDIT AGREEMENT (this "Amendment"), 
dated as of April 23, 1999, among TRANSDIGM HOLDING COMPANY, a Delaware 
corporation ("Holdings"), TRANSDIGM INC., a Delaware corporation (the 
"Borrower"), the various lending institutions party to the Credit Agreement 
referred to below (each, a "Lender" and, collectively, the "Lenders"), and 
BANKERS TRUST COMPANY, as Administrative Agent for the Lenders (the 
"Administrative Agent"). All capitalized terms used herein and not otherwise 
defined herein shall have the meanings provided such terms in the Credit 
Agreement.

                              W I T N E S S E T H :

                  WHEREAS, Holdings, the Borrower, the Lenders and the
Administrative Agent are parties to a Credit Agreement, dated as of December 3,
1998 (as amended through, but not including, the date hereof, the "Credit
Agreement"); and

                  WHEREAS, the parties hereto wish to amend the Credit Agreement
 as herein provided;

                  NOW, THEREFORE, it is agreed:

I.       AMENDMENTS TO CREDIT AGREEMENT.

                  1. Section 1.01 of the Credit Agreement is hereby amended by
deleting clause (a) thereof in its entirety and inserting the following new
clause (a) in lieu thereof:

                  "(a) Subject to and upon the terms and conditions set forth
         herein, (A) each Lender with an A Term Loan Commitment on the Initial
         Borrowing Date severally agrees to make on such date, and (B) each
         Lender with an A Term Loan Commitment on the AR Acquisition Date
         severally agrees to make on such date, in each case, a term loan (each,
         an "A Term Loan" and, collectively, the "A Term Loans") to the
         Borrower, which A Term Loans: (i) shall be incurred pursuant to two
         single drawings, the first of which shall be on the Initial Borrowing
         Date and the second of which shall be on the AR Acquisition Date; (ii)
         shall be denominated in U.S. Dollars; (iii) except as hereafter
         provided, shall, at the option of the Borrower, be incurred and
         maintained as, and/or converted into, Base Rate Loans or Eurodollar
         Loans, provided that (x) all A Term Loans made as part of the same
         Borrowing shall, unless otherwise specifically provided herein, consist
         of A Term Loans of the same Type and (y) unless the Administrative
         Agent has determined that the Syndication Date has occurred (at which
         time this clause (y) shall no longer be applicable), no more than four
         Borrowings of A Term Loans to be maintained as Eurodollar Loans may be
         incurred prior to the 60th day after the Initial Borrowing Date (each
         of which Borrowings of Eurodollar Loans may only have an Interest
         Period of (A) in the case of the first two such Borrowings, seven days,
         and (B) in the case of the remaining two Borrowings, one month, and the
         first of which Borrowings may only be made on the Initial Borrowing
         Date or on or prior to the sixth Business Day after the





         Initial Borrowing Date and with each such Borrowing made thereafter to
         be made only on the last day of the Interest Period of the immediately
         preceding Borrowing); and (iv) shall not exceed for any such Lender at
         the time of incurrence thereof on the Initial Borrowing Date or the AR
         Acquisition Date, as the case may be, that aggregate principal amount
         as is equal to the A Term Loan Commitment of such Lender as in effect
         on the Initial Borrowing Date or the AR Acquisition Date, as the case
         may be (before giving effect to any reductions thereto on such
         respective date pursuant to Section 3.03(b)). Once repaid, A Term Loans
         incurred hereunder may not be reborrowed."

                  2. Section 1.01 of the Credit Agreement is hereby further
amended by deleting clause (b) thereof in its entirety and inserting the
following new clause (b) in lieu thereof:

                  "(b) Subject to and upon the terms and conditions set forth
         herein, (A) each Lender with a B Term Loan Commitment on the Initial
         Borrowing Date severally agrees to make on such date, and (B) each
         Lender with a B Term Loan Commitment on the AR Acquisition Date
         severally agrees to make on such date, in each case, a term loan (each,
         a "B Term Loan" and, collectively, the "B Term Loans" and, together
         with the A Term Loans, the "Term Loans") to the Borrower, which B Term
         Loans: (i) shall be incurred pursuant to two single drawings, the first
         of which shall be on the Initial Borrowing Date and the second of which
         shall be on the AR Acquisition Date; (ii) shall be denominated in U.S.
         Dollars; (iii) except as hereafter provided, shall, at the option of
         the Borrower, be incurred and maintained as, and/or converted into,
         Base Rate Loans or Eurodollar Loans, provided that (x) all B Term Loans
         made as part of the same Borrowing shall, unless otherwise specifically
         provided herein, consist of B Term Loans of the same Type and (y)
         unless the Administrative Agent has determined that the Syndication
         Date has occurred (at which time this clause (y) shall no longer be
         applicable), no more than four Borrowings of B Term Loans to be
         maintained as Eurodollar Loans may be incurred prior to the 60th day
         after the Initial Borrowing Date (each of which Borrowings of
         Eurodollar Loans (I) may only have the same Interest Period as is then
         permitted for a Borrowing of A Term Loans that are maintained as
         Eurodollar Loans and (II) shall begin and end on the same day as a
         Borrowing of A Term Loans that are maintained as Eurodollar Loans); and
         (iv) shall not exceed for any such Lender at the time of incurrence
         thereof on the Initial Borrowing Date or the AR Acquisition Date, as
         the case may be, that aggregate principal amount as is equal to the B
         Term Loan Commitment of such Lender as in effect on the Initial
         Borrowing Date or the AR Acquisition Date, as the case may be (before
         giving effect to any reductions thereto on such respective date
         pursuant to Section 3.03(c)). Once repaid, B Term Loans incurred
         hereunder may not be reborrowed."

                  3. Section 3.03 of the Credit Agreement is hereby amended by
deleting clauses (b) and (c) thereof in their entirety and inserting the
following new clauses (b) and (c), respectively, in lieu thereof:

                  "(b) In addition to any other mandatory commitment reductions
         pursuant to this Section 3.03, the Total A Term Loan Commitment (and 
         the A Term Loan 


                                       2



         Commitment of each Lender) shall terminate in its entirety on the 
         Initial Borrowing Date (after giving effect to the incurrence of A 
         Term Loans on such date); provided that, notwithstanding the 
         foregoing, the portion of the Total A Term Loan Commitment effected 
         pursuant to the Second Amendment shall terminate in its entirety on 
         the AR Acquisition Date (after giving effect to the incurrence of A 
         Term Loans on such date).

                  (c) In addition to any other mandatory commitment reductions
         pursuant to this Section 3.03, the Total B Term Loan Commitment (and
         the B Term Loan Commitment of each Lender) shall terminate in its
         entirety on the Initial Borrowing Date (after giving effect to the
         incurrence of B Term Loans on such date); provided that,
         notwithstanding the foregoing, the portion of the Total B Term Loan
         Commitment effected pursuant to the Second Amendment shall terminate in
         its entirety on the AR Acquisition Date (after giving effect to the
         incurrence of B Term Loans on such date)."

                  4. Section 4.02 of the Credit Agreement is hereby amended by
deleting the table appearing in clause (b) thereof in its entirety and inserting
the following new table in lieu thereof:



"TRANCHE A SCHEDULED REPAYMENT DATE                                AMOUNT
- -----------------------------------                              ----------
                                                                     
         August 15, 1999                                         $4,133,333
         November 15, 1999                                       $1,705,000
         February 15, 2000                                       $1,705,000
         May 15, 2000                                            $1,705,000
         August 15, 2000                                         $1,705,000
         November 15, 2000                                       $2,583,333
         February 15, 2001                                       $2,583,333
         May 15, 2001                                            $2,583,334
         August 15, 2001                                         $2,583,333
         November 15, 2001                                       $2,583,333
         February 15, 2002                                       $2,583,334
         May 15, 2002                                            $2,583,333
         August 15, 2002                                         $2,583,333
         November 15, 2002                                       $3,461,667
         February 15, 2003                                       $3,461,667
         May 15, 2003                                            $3,461,667
         August 15, 2003                                         $3,461,666
         November 15, 2003                                       $3,306,667
         February 15, 2004                                       $3,306,667
         May 15, 2004                                            $3,306,667
         August 15, 2004                                         $3,306,667
         A Term Loan Maturity Date                               $3,306,666".




                                       3



                  5. Section 4.02 of the Credit Agreement is hereby further
amended by deleting the table appearing in clause (c) thereof in its entirety
and inserting the following new table in lieu thereof:



"TRANCHE B SCHEDULED REPAYMENT DATE                              AMOUNT
- -----------------------------------                              --------
                                                              

         August 15, 1999                                         $310,000
         November 15, 1999                                       $310,000
         February 15, 2000                                       $155,000
         May 15, 2000                                            $155,000
         August 15, 2000                                         $155,000
         November 15, 2000                                       $155,000
         February 15, 2001                                       $155,000
         May 15, 2001                                            $155,000
         August 15, 2001                                         $155,000
         November 15, 2001                                       $155,000
         February 15, 2002                                       $155,000
         May 15, 2002                                            $155,000
         August 15, 2002                                         $155,000
         November 15, 2002                                       $155,000
         February 15, 2003                                       $155,000
         May 15, 2003                                            $155,000
         August 15, 2003                                         $155,000
         November 15, 2003                                       $155,000
         February 15, 2004                                       $155,000
         May 15, 2004                                            $155,000
         August 15, 2004                                         $155,000
         November 15, 2004                                       $155,000
         February 15, 2005                                     $9,713,333
         May 15, 2005                                          $9,713,333
         August 15, 2005                                       $9,713,334
         November 15, 2005                                     $9,713,333
         February 15, 2006                                     $9,713,333
         B Term Loan Maturity Date                             $9,713,334".


                  6. Section 4.02 of the Credit Agreement is hereby further
amended by inserting the following new clause (m) at the end thereof:

                  "(m) In addition to any other mandatory repayments pursuant to
         this Section 4.02, on any date upon which Holdings or any of its
         Subsidiaries receives proceeds from any purchase price adjustment
         effected pursuant to the AR Acquisition Agreement, 100% of such
         proceeds shall be applied to repay Revolving Loans (if any) outstanding
         at such time (with no corresponding reduction to the Total Revolving
         Loan Commitment)."



                                       4



                  7. Section 7.02 of the Credit Agreement is hereby amended by
(i) inserting the words "and the AR Transaction Documents" immediately following
the words "Transaction Documents" in each place such words appear therein and
(ii) inserting the words "and AR Transaction Document" immediately following the
words "Transaction Document" in each place such words appear therein.

                  8. Section 7.03 of the Credit Agreement is hereby amended by
inserting the words "or the AR Transaction Documents" immediately following the
words "Transaction Documents" appearing therein.

                  9. Section 7.05(a) of the Credit Agreement is hereby amended
by deleting such clause (a) in its entirety and inserting the following new
clause (a) in lieu thereof:

                  "(a) All proceeds of Term Loans incurred (i) on the Initial
         Borrowing Date, shall be used by the Borrower to finance the
         Transaction and to pay fees and expenses incurred in connection
         therewith and (ii) on the AR Acquisition Date, shall be used by the
         Borrower to finance the AR Transaction and to pay fees and expenses
         incurred in connection therewith, provided that such fees and expenses
         shall not exceed $2,000,000.

                  10. Section 7.05(b) of the Credit Agreement is hereby amended
by inserting the following parenthetical at the end thereof:

         "(exclusive of Revolving Loans and Swingline Loans incurred to finance
         the AR Transaction, although no more than $8,000,000 of Revolving Loans
         and Swingline Loans in the aggregate may be used to finance the AR
         Transaction)".

                  11. Section 7.06 of the Credit Agreement is hereby amended by
(i) inserting "(a)" immediately after the heading thereof and (ii) inserting the
following new clause (b) at the end thereof:

                  "(b) Except as may have been obtained or made on or prior to
         the AR Acquisition Date (and which remain in full force and effect on
         the AR Transaction Date), no order, consent, approval, license,
         authorization or validation of, or filing, recording or registration
         with, or exemption by, any foreign or domestic governmental or public
         body or authority, or any subdivision thereof, is required to authorize
         or is required in connection with (i) the execution, delivery and
         performance of any AR Transaction Document or (ii) the legality,
         validity, binding effect or enforceability of any AR Transaction
         Document."

                  12. Section 7.09 of the Credit Agreement is hereby amended by
(i) inserting the words "and the AR Projections" immediately following the word
"Projections" appearing in the first parenthetical thereof and (ii) inserting
the words "and the AR Transaction Documents" immediately following the words
"Transaction Documents" appearing in the third parenthetical thereof.



                                       5



                  13. Section 7.10(a) of the Credit Agreement is hereby amended
by (i) inserting a reference to "and the AR Acquisition Date" immediately
following the reference to "Initial Borrowing Date" appearing therein, (ii)
inserting a reference to "and, to the extent applicable, the AR Transaction,"
immediately following the reference to "Transaction" appearing therein and (iii)
inserting a reference to "and, to the extent applicable, the AR Transaction
Documents," immediately following the reference to "Transaction Documents"
appearing therein.

                  14. Section 7.10(b) of the Credit Agreement is hereby amended
by inserting the following new clauses (iii) and (iv) at the end thereof:

                  "(iii) The audited consolidated balance sheets of AR Holdings
         and its Subsidiaries for the fiscal years ended June 28, 1996, June 27,
         1997 and June 26, 1998, respectively, and the unaudited consolidated
         balance sheet or AR Holdings and its Subsidiaries for its fiscal
         quarter ended December 31, 1998, and (in each case) the related
         consolidated statements of income, cash flows and shareholders' equity
         of AR Holdings and its Subsidiaries for the fiscal years or six month
         period, as the case may be, ended on such dates, copies of which have
         been furnished to the Lenders prior to the Second Amendment Effective
         Date, present fairly in all material respects the consolidated
         financial position of AR Holdings and its Subsidiaries at the date of
         such balance sheets and the consolidated results of the operations of
         AR Holdings and its Subsidiaries for the periods covered thereby. All
         of the foregoing historical financial statements have been prepared in
         accordance with GAAP consistently applied except as otherwise disclosed
         in the notes thereto and, in the case of the six month financial
         statements, (x) such financial statements shall reflect adjustments
         consistent with those reflected in such statements delivered to the
         Administrative Agent prior to the Second Amendment Effective Date and
         (y) the absence of footnotes and normal year-end audit adjustments.

                  (iv) The PRO FORMA consolidated balance sheet of Holdings and
         its Subsidiaries at December 31, 1998 and the PRO FORMA consolidated
         statement of income of Holdings and its Subsidiaries for the twelve
         months ended December 31, 1998, in each case after giving effect to the
         Transaction and the financing therefor, copies of which have been
         furnished to the Lenders prior to the Second Amendment Effective Date,
         present fairly in all material respects the PRO FORMA consolidated
         financial position of Holdings and its Subsidiaries as of December 31,
         1998 and the PRO FORMA consolidated results of operations of Holdings
         and its Subsidiaries for the twelve-month period ended on December 31,
         1998. Such pro forma financial statements have been prepared on a basis
         consistent with the historical financial statements set forth in clause
         (i) of this Section 7.10(b)."

                  15. Section 7.10(d) of the Credit Agreement is hereby amended
by (i) inserting the phrase "and the AR Acquisition Date" immediately after the
phrase "Initial Borrowing Date" appearing therein and (ii) inserting the word
"each" immediately after the word "on" appearing in the first parenthetical
thereof.



                                       6



                  16. Section 7.10(e) of the Credit Agreement is hereby amended
by (i) inserting "(i)" immediately after the reference to "(e)" thereof and (ii)
inserting the following new clause (ii) at the end thereof:

                  "(ii) The AR Projections have been prepared on a basis
         consistent with the financial statements referred to in Section 7.10(b)
         (except as may otherwise be indicated in the AR Projections), and are
         based on good faith estimates and assumptions made by the management of
         Holdings. On the AR Acquisition Date (i) such management believed that
         the AR Projections were reasonable and attainable and (ii) there is no
         fact known to Holdings or any of its Subsidiaries which could have a
         Material Adverse Effect which has not been disclosed herein or in such
         other documents, certificates and statements furnished to the Lenders
         for use in connection with the AR Transaction."

                  17. Section 7.24 of the Credit Agreement is hereby amended by
(i) inserting the words "and in the AR Transaction Documents" immediately after
the words "Transaction Documents" appearing therein and (ii) inserting the words
"or the AR Acquisition Date, as the case may be," immediately following the
words "Initial Borrowing Date" appearing therein.

                  18. Section 7 of the Credit Agreement is hereby further
amended by inserting the following new Section 7.28 immediately after Section
7.27 appearing therein:

                  "7.28 CONSUMMATION OF AR TRANSACTION. At the time of
         consummation thereof, the AR Transaction shall have been consummated in
         all material respects in accordance with the terms of the respective AR
         Transaction Documents and all applicable laws. At the time of
         consummation thereof, all necessary and material consents and approvals
         of, and filings and registrations with, and all other actions in
         respect of, all governmental agencies, authorities or instrumentalities
         required to make or consummate the AR Transaction have been obtained,
         given, filed or taken or waived and are or will be in full force and
         effect (or effective judicial relief with respect thereto has been
         obtained). All applicable waiting periods with respect thereto have or,
         prior to the time when required, will have, expired without, in all
         such cases, any action being taken by any competent authority which
         restrains, prevents, or imposes material adverse conditions upon the AR
         Transaction. Additionally, there does not exist any judgment, order or
         injunction prohibiting or imposing material adverse conditions upon the
         AR Transaction, or the occurrence of any Credit Event or the
         performance by Holdings and its Subsidiaries of their respective
         obligations under the AR Transaction Documents and all applicable laws.
         The AR Transaction has been consummated in all material respects in
         accordance with the respective AR Transaction Documents and all
         applicable laws."

                  19. Section 8.10 of the Credit Agreement is hereby amended by
inserting the following new sentence at the end thereof:

         "Notwithstanding the foregoing, AR Holdings and its Subsidiaries may
         have a fiscal year end and fiscal quarter ends on dates that are
         different than those of Holdings and its other Subsidiaries, although
         Holdings agrees to cause AR Holdings to change its and its
         Subsidiaries' fiscal year and fiscal quarter ends to dates that are
         consistent with those of 



                                       7



         Holdings and its other Subsidiaries as promptly as practicable
         following the Second Amendment Effective Date."

                  20. Section 8.14(a) of the Credit Agreement is hereby amended
by inserting the following new sentence at the end thereof:

         "The Borrower and the Lenders hereby agree that the AR Acquisition
         shall be a Permitted Acquisition subject to the terms of this Section
         8.14 although clauses (viii) and (ix) above shall be determined without
         regard to, and shall not apply to, the AR Acquisition so long as (x)
         the aggregate consideration paid in connection with the AR Acquisition
         (without giving effect to any Indebtedness acquired and refinanced in
         connection therewith) does not exceed $29,000,000, (y) substantially
         all Indebtedness of AR Holdings and its Subsidiaries is refinanced at
         the time of the consummation of the AR Transaction and (z) the AR
         Transaction is financed with no more than $34,000,000 of Term Loans and
         no more than $8,000,000 of Revolving Loans and Swingline Loans."

                  21. Section 9.08(a) of the Credit Agreement is hereby amended
by (i) deleting the reference to the amount "$6,500,000" appearing in clause (i)
thereof and inserting the amount "$7,500,000" in lieu thereof, (ii) deleting in
its entirety the table appearing in said Section and inserting the following new
table in lieu thereof:



"FISCAL YEAR ENDING                                        AMOUNT
 ------------------                                        ------
                                                       
September 30, 2000                                        $7,500,000
September 30, 2001                                        $7,500,000
September 30, 2002                                        $7,500,000
September 30, 2003                                        $7,500,000
September 30, 2004                                        $7,500,000
September 30, 2005                                        $8,500,000
September 30, 2006                                        $9,000,000";


and (iii) inserting the parenthetical "(other than the AR Acquisition)"
immediately following the words "any Permitted Acquisition" appearing in the
second sentence thereof.

                  22. Section 9.09 of the Credit Agreement is hereby amended by
(i) deleting in its entirety the table appearing in said Section and inserting
the following new table in lieu thereof:



"FISCAL QUARTER ENDING CLOSEST TO                         AMOUNT
 --------------------------------                         ------
                                                      
December 31, 1998                                        $40,000,000
March 31, 1999                                           $44,000,000
June 30, 1999                                            $44,000,000
September 30, 1999                                       $48,000,000
December 31, 1999                                        $48,000,000
March 31, 2000                                           $48,000,000
June 30, 2000                                            $48,000,000



                                       8



September 30, 2000                                       $52,000,000
December 31, 2000                                        $52,000,000
March 31, 2001                                           $52,000,000
June 30, 2001                                            $52,000,000
September 30, 2001                                       $56,000,000
December 31, 2001                                        $56,000,000
March 31, 2002                                           $56,000,000
June 30, 2002                                            $56,000,000
September 30, 2002                                       $62,000,000
December 31, 2002                                        $62,000,000
March 31, 2003                                           $62,000,000
June 30, 2003                                            $62,000,000
September 30, 2003
and the last day of each fiscal quarter of
Holdings ending thereafter                               $69,000,000";


and (ii) inserting the parenthetical "(other than the AR Acquisition)"
immediately following the words "any Permitted Acquisition" appearing in the
second sentence thereof.

                  23. Section 9.10 of the Credit Agreement is hereby amended by
deleting in its entirety the table appearing in said Section and inserting the
following new table in lieu thereof:



"FISCAL QUARTER ENDING CLOSEST TO                            RATIO
 --------------------------------                            -----
                                                          
March 31, 1999                                               1.65:1.00
June 30, 1999                                                1.65:1.00
September 30, 1999                                           1.65:1.00
December 31, 1999                                            1.75:1.00
March 31, 2000                                               1.85:1.00
June 30, 2000                                                1.85:1.00
September 30, 2000                                           1.85:1.00
December 31, 2000                                            2.00:1.00
March 31, 2001                                               2.00:1.00
June 30, 2001                                                2.00:1.00
September 30, 2001                                           2.15:1.00
December 31, 2001                                            2.25:1.00
March 31, 2002                                               2.25:1.00
June 30, 2002                                                2.25:1.00
September 30, 2002
and the last day of each fiscal quarter of Holdings ending
thereafter                                                   2.50:1.00"


                  24. Section 9.11 of the Credit Agreement is hereby amended by
deleting the reference therein to "5.00" and inserting a reference to "5.25" in
lieu thereof.



                                       9



                  25. Section 11 of the Credit Agreement is hereby amended by
deleting the definitions of "A Term Loan Commitment" and "B Term Loan
Commitment" appearing therein and inserting the following new definitions of "A
Term Loan Commitment" and "B Term Loan Commitment" in lieu thereof:

                  "A Term Loan Commitment" shall mean, with respect to each
         Lender, the amount set forth opposite such Lender's name in Annex I (as
         in effect on the Initial Borrowing Date in the case of A Term Loans
         incurred on such date and as in effect on the AR Acquisition Date in
         the case of A Term Loans incurred on such date, in either case)
         directly below the column entitled "A Term Loan Commitment," as the
         same may be terminated pursuant to Sections 3.03 and/or Section 10.

                  "B Term Loan Commitment" shall mean, with respect to each
         Lender, the amount set forth opposite such Lender's name in Annex I (as
         in effect on the Initial Borrowing Date in the case of B Term Loans
         incurred on such date and as in effect on the AR Acquisition Date in
         the case of B Term Loans incurred on such date, in either case)
         directly below the column entitled "B Term Loan Commitment," as the
         same may be terminated pursuant to Sections 3.03 and/or Section 10.

                  26. Section 11 of the Credit Agreement is hereby further
amended by (i) inserting the text "and up to $1,750,000 in the aggregate of
one-time cash and non-cash severance expenses directly associated with the AR
Acquisition" immediately following the reference to "Subordinated Note Offering
Memorandum" appearing in the definition of "Consolidated EBITDA" and (ii)
deleting the word "and" appearing at the end of the final clause (x) appearing
in the definition of "Consolidated EBITDA" and inserting the following new
clause (z) at the end of said definition:

         "and (z) in determining Consolidated EBITDA for purposes of Sections
         9.09 and 9.10, Consolidated EBITDA for any period shall be calculated
         on a Pro Forma Basis to give effect to the AR Acquisition to the extent
         such acquisition occurred during such period and the assets acquired
         pursuant to such acquisition were not subsequently sold or otherwise
         disposed of by Holdings or any of its Subsidiaries during such period".

                  27. Section 11 of the Credit Agreement is hereby further
amended by inserting in the appropriate alphabetical order the following new
definitions:

                  "Adams Rite Aerospace" shall mean Adams Rite Aerospace, Inc.,
a California corporation.

                  "AR Acquisition" shall mean the merger of a Wholly-Owned
         Domestic Subsidiary of the Borrower with and into AR Holdings, with AR
         Holdings being the surviving corporation of such merger, pursuant to
         the terms of the AR Acquisition Agreement and the other AR Acquisition
         Documents.

                  "AR Acquisition Agreement" shall mean the Agreement and Plan
         of Reorganization, dated as of February __, 1999, by and among the
         Borrower, a Wholly-



                                       10



         Owned Domestic Subsidiary of the Borrower, AR Holdings and a
         representative for the shareholders of AR Holdings.

                  "AR Acquisition Date" shall mean the date on which the AR
         Transaction is consummated and the incurrence of Term Loans pursuant to
         the Second Amendment is made, which date shall be the Second Amendment
         Effective Date.

                  "AR Acquisition Documents" shall mean the AR Acquisition
         Agreement and any other agreements, instruments and documents entered
         into in connection with the AR Acquisition.

                  "AR Holdings" shall mean ZMP, Inc., a California corporation
         and the owner of all of the outstanding capital stock of Adams Rite
         Aerospace.

                  "AR Projections" shall mean the projections, dated __________,
         1999, which were prepared by or on behalf of Holdings in connection
         with the AR Transaction and which were delivered to the Lenders prior
         the Second Amendment Effective Date.

                  "AR Refinancing" shall mean the refinancing of substantially
         all of the Indebtedness of AR Holdings and its Subsidiaries as part of
         the AR Acquisition.

                  "AR Refinancing Documents" shall mean any agreements,
         instruments and documents entered into in connection with the AR
         Refinancing.

                  "AR Transaction" shall mean, collectively, the AR Acquisition 
         and the AR Refinancing.

                  "AR Transaction Documents" shall mean the AR Acquisition
         Documents and the AR Refinancing Documents.

                  "Second Amendment" shall mean the Second Amendment to this
         Agreement, dated as of February 16, 1999.

                  "Second  Amendment  Effective Date" shall have the meaning
         provided in paragraph II.6. of the Second Amendment.

                  28. Annexes I and II to the Credit Agreement are hereby
amended by deleting same in their entirety and inserting in lieu thereof
Schedules I and II, respectively, attached hereto.

                  29. In connection with the incurrence of A Term Loans and B
Term Loans pursuant to this Amendment, the Lenders and the Borrower hereby agree
that, notwithstanding anything to the contrary contained in the Credit
Agreement, the Borrower and the Administrative Agent may take all such actions
as may be necessary to ensure that all Lenders with outstanding A Term Loans and
B Term Loans, as the case may be, continue to participate in each Borrowing of
outstanding A Term Loans and B Term Loans (after giving effect to the incurrence
of A Term Loans and B Term Loans pursuant to this Amendment) on a PRO RATA basis
(including by having



                                       11



the A Term Loans or B Term Loans, as the case may be, incurred pursuant to this
Amendment added to the then outstanding Borrowings of A Term Loans or B Term
Loans, as the case may be, on a pro rata basis even though as a result thereof
such new A Term Loan or B Term Loan, as the case may be, may effectively have a
shorter Interest Period than the existing A Term Loans or B Term Loans, as the
case may be), and it is hereby agreed that (x) to the extent any existing
Borrowings of A Term Loans and B Term Loans that are maintained as Eurodollar
Loans are affected as a result thereof, any breakage costs of the type described
in Section 1.11 of the Credit Agreement incurred by such Lenders in connection
therewith shall be for the account of the Borrower or (y) to the extent the A
Term Loans and B Term Loans that are incurred pursuant to this Amendment are
added to the then outstanding Borrowings of A Term Loans or B Term Loans, as the
case may be, which are maintained as Eurodollar Loans, the Lenders that have
made such additional A Term Loans or B Term Loans, as the case may be, shall be
entitled to receive an effective interest rate on such additional Term Loans as
is equal to the Eurodollar Rate as in effect two Business Days prior to the
incurrence of such additional Term Loans plus the then Applicable Eurodollar
Margin.

II.      MISCELLANEOUS PROVISIONS.

                  1. In order to induce the Lenders to enter into this
Amendment, each of Holdings and the Borrower hereby represents and warrants
that:

                  (a) no Default or Event of Default exists as of the Second
         Amendment Effective Date (as defined below), both before and after
         giving effect to this Amendment; and

                  (b) all of the representations and warranties contained in the
         Credit Agreement and the other Credit Documents are true and correct in
         all material respects on the Second Amendment Effective Date, both
         before and after giving effect to this Amendment, with the same effect
         as though such representations and warranties had been made on and as
         of the Second Amendment Effective Date (it being understood that any
         representation or warranty made as of a specific date shall be true and
         correct in all material respects as of such specific date).

                  2. All parties hereto hereby acknowledge and agree that all
extensions of credit (including all Term Loans and all amounts owing with
respect thereto) pursuant to the Credit Agreement, as amended hereby, shall be
entitled to the benefits of all Guaranties and Security Documents executed and
delivered pursuant to the Credit Agreement, and to the benefit of all other
Credit Documents.

                  3. This Amendment is limited as specified and shall not
constitute a modification, acceptance or waiver of any other provision of the
Credit Agreement or any other Credit Document.

                  4. This Amendment may be executed in any number of
counterparts and by the different parties hereto on separate counterparts, each
of which counterparts when executed and delivered shall be an original, but all
of which shall together constitute one and the same



                                       12



instrument. A complete set of counterparts shall be lodged with the Borrower and
the Administrative Agent.

                  5. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE
PARTIES HERETO SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAW OF
THE STATE OF NEW YORK.

                  6. This Amendment shall become effective on the date (the
"Second Amendment Effective Date") when the following conditions have been met
to the satisfaction of the Administrative Agent and the Required Lenders
(determined immediately after the occurrence of the Second Amendment Effective
Date):

                  (i) each of Holdings, the Borrower, each Subsidiary Guarantor,
         the Required Lenders (determined before giving effect to this
         Amendment) and each Lender which is providing an A Term Loan Commitment
         and/or a B Term Loan Commitment pursuant to this Amendment shall have
         signed a counterpart hereof (whether the same or different
         counterparts) and shall have delivered (including by way of facsimile
         transmission) the same to the Administrative Agent at the Notice
         Office;

                  (ii) (x) there shall have been delivered to the Administrative
         Agent and the Lenders true and correct copies of all AR Transaction
         Documents, certified as such by an Authorized Officer of Holdings or
         the Borrower, and all terms and conditions of the AR Transaction
         Documents shall be in form and substance reasonably satisfactory to the
         Administrative Agent, and (y) the AR Transaction shall have been
         consummated in accordance with the AR Transaction Documents (without
         giving effect to any amendment or modification thereof or waiver with
         respect thereto unless consented to by the Administrative Agent) and
         the relevant requirements of the Credit Agreement (as amended hereby);

                  (iii) the Administrative Agent shall have received from each
         Credit Party (including any Credit Party acquired pursuant to the AR
         Acquisition) certified copies of resolutions of the Board of Directors
         or statements of unanimous written consent in lieu thereof of such
         Credit Party with respect to the matters set forth in this Amendment
         and the transactions contemplated herein and such resolutions shall be
         in form and substance reasonably satisfactory to the Administrative
         Agent;

                  (iv) (A) AR Holdings and each Domestic Subsidiary thereof
         acquired in connection with the AR Acquisition (including Adams Rite
         Aerospace) shall have (i) executed and delivered to the Administrative
         Agent a subsidiary assumption agreement pursuant to which each such
         Person shall become a party to the Subsidiaries Guaranty, the Pledge
         Agreement and the Security Agreement and (ii) complied with any other
         requirements of Sections 8.11 and 9.15 of the Credit Agreement to the
         extent required by the Administrative Agent to be complied with on the
         Second Amendment Effective Date and (B) Holdings and the other Credit
         Parties shall have duly pledged and delivered to the Collateral Agent
         any additional Pledge Agreement Collateral acquired pursuant to the AR



                                       13



         Acquisition, together with the officer's certificate referred to in
         Section 3.3 of the Pledge Agreement;

                  (v) the Administrative Agent shall have received a solvency
         certificate from the Chief Financial Officer of Holdings in the form of
         Exhibit J to the Credit Agreement, except that such certificate shall
         be dated the Second Amendment Effective Date and shall be modified (to
         the satisfaction of the Administrative Agent) to provide that such
         certificate is being provided after giving effect to the AR
         Transaction;

                  (vi) the Administrative Agent shall have received a
         certificate, dated the Second Amendment Effective Date and signed on
         behalf of the Borrower by the President or any Vice President of the
         Borrower, stating that all of the conditions in clause (i) of this
         Paragraph 6 and in Section 6.01 of the Credit Agreement have been
         satisfied, and all of the representations and warranties contained in
         Section 7 of the Credit Agreement (as amended hereby) are true and
         correct in all material respects, in each such case, on such date;

                  (vii) the Administrative Agent shall have received (x) true
         and correct copies of the historical financial statements, the pro
         forma financial statements and the AR Projections referred to in
         Sections 7.10(b)(iii), (b)(iv) and (e)(ii) of the Credit Agreement (as
         amended hereby), all of which shall be in form and substance reasonably
         satisfactory to the Administrative Agent and the Required Lenders and
         (y) true and correct copies of the certificates required to be
         delivered pursuant to Section 8.14(a) of the Credit Agreement (as
         amended hereby);

                  (viii) the Borrower shall have paid to the Administrative
         Agent and the Lenders all costs, fees and expenses (including, without
         limitation, legal fees and expenses) payable to the Administrative
         Agent and the Lenders to the extent then due;

                  (ix) all corporate and legal proceedings and all instruments
         and agreements in connection with the transactions contemplated by this
         Amendment and the AR Transaction Documents shall be reasonably
         satisfactory in form and substance to the Administrative Agent, and the
         Administrative Agent shall have received all information and copies of
         all documents and papers, including records of corporate proceedings or
         governmental approvals, good standing certificates and bring-down
         telegrams or facsimiles, if any, which the Administrative Agent may
         have reasonably requested in connection therewith, such documents and
         papers where appropriate to be certified by proper corporate or
         governmental authorities;

                  (x) the Administrative Agent shall have received, and shall be
         reasonably satisfied with both the form and substance of, an opinion of
         Latham & Watkins, counsel to Holdings and the Borrower, with respect to
         the matters contemplated by this Amendment; and

                  (xi) the Administrative Agent shall have received (A) executed
         Financing Statements (Form UCC-1) in appropriate form for filing under
         the UCC or other 



                                       14



         appropriate filing offices of each jurisdiction as may be necessary or,
         in the reasonable opinion of the Collateral Agent, desirable to perfect
         the security interests in all of the Collateral acquired pursuant to
         the AR Acquisition, (B) certified copies of Requests for Information or
         Copies (Form UCC-11), or equivalent reports, listing all effective
         financing statements that name AR Holdings or any of its Subsidiaries
         as debtor and that are filed in the jurisdictions referred to in clause
         (A) above, together with copies of such other financing statements that
         name AR Holdings or any of its Subsidiaries as debtors (none of which
         shall cover the Collateral except to the extent evidencing Permitted
         Liens or in respect of which the Collateral Agent shall have received
         appropriate termination statements executed by the secured party
         thereunder), (C) evidence of the completion of all other recordings and
         filings of, or with respect to, such security interests as may be
         necessary or, in the reasonable opinion of the Collateral Agent,
         desirable to perfect the security interests intended to be created by
         the Security Documents, and (D) evidence (including appropriate pay-off
         letters, UCC-3 termination statements, mortgage releases and other
         release documents) that the capital stock of AR Holdings and its
         Subsidiaries and all assets of such Persons have been acquired pursuant
         to the AR Acquisition free and clear of all Liens.

Notwithstanding anything to the contrary contained above or elsewhere in this
Second Amendment, unless both the Second Amendment Effective Date and the AR
Acquisition Date occur on or prior to March 31, 1999, the Second Amendment
Effective Date shall not thereafter occur and this Amendment shall be of no
further force or effect. Unless the Administrative Agent has received actual
notice from any Lender that the conditions contained above have not been met,
upon the satisfaction of the condition described in clause (i) of the
immediately preceding sentence and upon the Administrative Agent's good faith
determination that the other conditions described above have been met, the
Second Amendment Effective Date shall be deemed to have occurred, regardless of
any subsequent determination that one or more of the conditions thereto had not
been met (although the occurrence of the Second Amendment Effective Date shall
not release the Borrower from any liability for failure to satisfy one or more
of the applicable conditions specified above). The Administrative Agent will
give the Borrower and each Lender prompt notice of the occurrence of the Second
Amendment Effective Date. The acceptance by the Borrower of the proceeds of the
Loans on the AR Acquisition Date shall be deemed to constitute a representation
and warranty by the Borrower (including, without limitation, for purposes of
Section 10.02 of the Credit Agreement) to the effect that all conditions
contained above in this Paragraph 6 have been satisfied as of the Second
Amendment Effective Date.

                  7. From and after the Second Amendment Effective Date, all
references in the Credit Agreement and each of the other Credit Documents to the
Credit Agreement shall be deemed to be references to the Credit Agreement as
amended hereby.

                                      * * *



                                       15



                  IN WITNESS WHEREOF, the parties hereto have caused their duly
authorized officers to execute and deliver this Amendment as of the date first
above written.


                                  TRANSDIGM HOLDING COMPANY

                                  By /s/ Peter B. Radekevich
                                    --------------------------------------------
                                    Title: Chief Financial Officer

                                  TRANSDIGM INC.

                                  By /s/ Peter B. Radekevich
                                    --------------------------------------------
                                    Title: Chief Financial Officer

                                  MARATHON POWER TECHNOLOGIES COMPANY

                                  By /s/ Peter B. Radekevich
                                    --------------------------------------------
                                    Title: Chief Financial Officer

                                  BANKERS TRUST COMPANY, Individually and
                                  as Administrative Agent

                                  By /s/ Gregory Shefrin
                                    --------------------------------------------
                                    Title: Principal

                                  CREDIT SUISSE FIRST BOSTON,
                                  Individually and as Syndication Agent

                                  By /s/ Bill O'Daly
                                    --------------------------------------------
                                    Title: Vice President

                                  By /s/ Robert Hetu
                                    --------------------------------------------
                                    Title: Vice President

                                  BANK OF NOVA SCOTIA

                                  By /s/ Robert Gaviglio
                                    --------------------------------------------
                                    Title: Senior Relationship Manager

                                  FLEET NATIONAL BANK,
                                  Individually and as Documentation Agent

                                  By /s/ James C. Silva
                                    --------------------------------------------
                                    Title: Vice President



                                       16



                                    NBD BANK

                                    By /s/ Gary L. Wilson
                                      ------------------------------------------
                                      Title: First Vice President

                                    GENERAL ELECTRIC CAPITAL CORPORATION

                                    By
                                      ------------------------------------------
                                      Title:

                                    HELLER FINANCIAL, INC.

                                    By /s/ Scott Ziemke
                                      ------------------------------------------
                                      Title: Assistant Vice President

                                    NATIONAL CITY BANK

                                    By /s/ Joseph D. Robison
                                      ------------------------------------------
                                      Title: Vice President

                                    INDOSUEZ CAPITAL FUNDING II A, LIMITED
                                    By Indosuez Capital Luxembourg,
                                          as Collateral Agent

                                    By /s/ Melissa Marano
                                      ------------------------------------------
                                      Title: Vice President

                                    INDOSUEZ CAPITAL FUNDING IV, L.P.
                                    By Indosuez Capital Luxembourg,
                                          as Collateral Agent

                                    By /s/ Melissa Marano
                                      ------------------------------------------
                                      Title: Vice President

                                    PARIBAS CAPITAL FUNDING LLC

                                    By /s/ Jeffrey J. Youle
                                      ------------------------------------------
                                      Title:

                                    SANKATY HIGH YIELD ASSET PARTNERS, L.P.

                                    By /s/ Diane Exter
                                      ------------------------------------------
                                      Title: Portfolio Manager



                                       17



                                     TORONTO DOMINION (NEW YORK), INC.

                                     By
                                       -----------------------------------------
                                       Title:



                                       18



                                                                         ANNEX I




                              Outstanding       Outstanding            A                B          Revolving
          Lender                 A                 B             Term Loan        Term Loan           Loan
          ------              Term Loans        Term Loans       Commitment       Commitment       Commitment
                              ----------        ----------       ----------       ----------       ----------
                                                                                           
Bankers Trust Company          $7,672,500       $9,012,500              $0                $0       $5,115,000

Credit Suisse First Boston     $6,277,500       $1,237,500              $0                $0       $4,185,000

Bank of Nova Scotia            $6,000,000               $0              $0        $1,000,000       $4,000,000

Fleet National Bank            $4,125,000       $4,125,000      $2,000,000        $1,500,000       $2,750,000

NBD Bank                       $6,000,000               $0      $4,000,000        $2,000,000       $4,000,000

General Electric Capital       $4,125,000       $4,125,000      $3,500,000        $2,000,000       $2,750,000
Corporation

Heller Financial, Inc.         $5,400,000       $2,000,000      $2,000,000        $1,000,000       $3,600,000

National City Bank.            $5,400,000       $2,000,000      $3,500,000        $2,000,000       $3,600,000

Indosuez Capital Funding               $0       $3,750,000              $0                $0               $0
II A, Ltd.

Indosuez Capital Funding               $0       $3,750,000      $1,000,000        $1,000,000               $0
IV, L.P.

Paribas Capital Funding                $0       $7,500,000      $1,000,000        $2,000,000               $0
LLC

Sankaty High Yield Asset               $0       $7,500,000              $0        $2,500,000               $0
Partners, L.P.

Toronto Dominion (New                  $0               $0              $0        $2,000,000               $0
York), Inc.

TOTAL:                        $45,000,000      $45,000,000     $17,000,000       $17,000,000      $30,000,000






                                                                        Annex II


                                                               

BANKERS TRUST COMPANY                                             130 Liberty Street
                                                                  New York, NY 10006
                                                                  Attention:  Greg Shefrin
                                                                  Telephone No.:  (212) 250-1724
                                                                  Facsimile No.:  (212) 250-7218

CREDIT SUISSE FIRST BOSTON                                        11 Madison Avenue
                                                                  New York, NY 10010
                                                                  Attention: Bill O'Daly
                                                                  Telephone No.: (212) 325-9909
                                                                  Facsimile No.: (212) 325-8388

BANK OF NOVA SCOTIA                                               One Liberty Plaza
                                                                  New York, NY 10006
                                                                  Attention: Robert Gaviglio
                                                                  Telephone No.: (212) 225-5054
                                                                  Facsimile No.: (212) 225-5090

FLEET BANK                                                        One Federal Street
                                                                  Mail Stop: MA OF D03C
                                                                  Boston, MA 02110
                                                                  Attention:  Jim Silva
                                                                  Telephone No.:  (617) 346-4399
                                                                  Facsimile No.:  (617) 346-4806

NBD BANK                                                          611 Woodward Street
                                                                  Detroit, MI 48226
                                                                  Attention:  Paul DeMelo
                                                                  Telephone No.:  (313) 225-2520
                                                                  Facsimile No.:  (313) 225-1212

GE CAPITAL CORPORATION                                            335 Madison Avenue
                                                                  New York, NY 10017
                                                                  Attention:  Kenneth Li
                                                                  Telephone No.:  (212) 370-8040
                                                                  Facsimile No.:  (212) 983-8767

HELLER FINANCIAL INC.                                             500 West Monroe Street
                                                                  Chicago, IL 60661
                                                                  Attention:  Linda Wolf
                                                                  Telephone No.:  (312) 441-7894
                                                                  Facsimile No.:  (312) 441-7357





                                                                        Annex II
                                                                          Page 2


NATIONAL CITY BANK                                                1900 East North Street
                                                                  7th Floor
                                                                  Cleveland, OH 44114
                                                                  Attention:  Joseph Robinson
                                                                  Telephone No.:  (216) 575-9254
                                                                  Facsimile No.:  (216) 575-9396

INDOSUEZ CAPITAL FUNDING                                          1211 Avenue of the Americas
                                                                  New York, NY 10036
                                                                  Attention:  Maklikah Buchweitz
                                                                  Telephone No.:  (212) 278-2213
                                                                  Facsimile No.:  (212) 278-2254

PARIBAS CAPITAL LLC                                               787 Seventh Avenue
                                                                  New York, NY 10019
                                                                  Attention:  Francois Gauvin
                                                                  Telephone No.:  (212) 841-2548
                                                                  Facsimile No.:  (212) 841-2363

SANKATY HIGH YIELD ASSET PARTNERS, L.P.                           2 Copley Place
                                                                  Boston, MA 02116
                                                                  Attention:  Diane Exter
                                                                  Telephone No.:  (617) 572-3216
                                                                  Facsimile No.:  (617) 572-3274

TORONTO DOMINION (NEW YORK), INC                                  909 Fannie Street
                                                                  Suite 1700
                                                                  Houston, TX  77101
                                                                  Attention:  David Parker
                                                                  Telephone No.:  (713) 653-8248
                                                                  Facsimile No.: (713)
                                                                                      ----------