Exhibit 10.1

TRANSDIGM INC.,

TRANSDIGM GROUP INCORPORATED,

THE GUARANTORS named herein

and

THE BANK OF NEW YORK TRUST COMPANY, N.A., as Trustee

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SECOND SUPPLEMENTAL INDENTURE

Dated as of February 7, 2007

To

Indenture Dated as of June 23, 2006

by and among

TRANSDIGM INC.,

TRANSDIGM GROUP INCORPORATED,

the GUARANTORS named therein and

THE BANK OF NEW YORK TRUST COMPANY, N.A., as Trustee

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7-3/4% Senior Subordinated Notes due 2014

of TransDigm Inc.

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SECOND SUPPLEMENTAL INDENTURE

SECOND SUPPLEMENTAL INDENTURE (this “SUPPLEMENTAL INDENTURE”), dated as of
February 7, 2007, among Aviation Technologies, Inc., a Delaware corporation
(“ATI”), Avtech Corporation, a Washington corporation (“AVTECH”), Transicoil
Corp., a Delaware corporation (“TRANSICOIL”), West Coast Specialties, Inc., a
Washington corporation (“WEST COAST”), Malaysian Aerospace Services, Inc., a
Delaware corporation (“MALAYSIAN” and, together with ATI, Avtech, Transicoil and
West Coast, the “GUARANTEEING SUBSIDIARIES”), TransDigm Inc., a Delaware
corporation (the “COMPANY”), TransDigm Group Incorporated, a Delaware
corporation (“TD GROUP”), Adams Rite Aerospace, Inc., a California corporation
(“ADAMS RITE”), ZMP, Inc., a California corporation (“ZMP”), MarathonNorco
Aerospace, Inc., a Delaware corporation (“MARATHON”), Christie Electric Corp., a
California corporation (“CHRISTIE”), Champion Aerospace Inc., a Delaware
corporation (“CHAMPION”), AVIONIC INSTRUMENTS INC., a Delaware corporation
(“AVIONIC”), DAC Realty Corp., a New Jersey corporation (“DAC”), Skurka
Aerospace Inc., a Delaware corporation (“SKURKA”), SWEENEY ENGINEERING CORP., a
California corporation (“SWEENEY”), and CDA InterCorp., a Florida corporation
(“CDA” and, together with TD Group, Adams Rite, ZMP, Marathon, Christie,
Champion, Avionic, DAC, Skurka and Sweeney, the “EXISTING GUARANTORS”), and The
Bank of New York Trust Company, N.A., as trustee under the indenture referred to
below (the “TRUSTEE”).

W I T N E S S E T H

WHEREAS, the Company and the Existing Guarantors have heretofore executed and
delivered to the Trustee an indenture (as supplemented by the First Supplemental
Indenture thereto, dated as of November 2, 2006, the “INDENTURE”), dated as of
June 23, 2006, providing for the issuance by the Company of 7-3/4% Senior
Subordinated Notes due 2014 (the “NOTES”) and the guarantees thereof by each of
the Existing Guarantors;

WHEREAS, the Indenture provides that under certain circumstances described
therein, newly created or acquired Domestic Restricted Subsidiaries shall
execute and deliver to the Trustee a supplemental indenture to the Indenture
providing for a senior subordinated guarantee of payment of the Notes by such
Domestic Restricted Subsidiary (the “SUBSIDIARY GUARANTEE”); and

WHEREAS, pursuant to Section 9.01(g) of the Indenture, the Trustee is authorized
to execute and deliver this Supplemental Indenture without the consent of the
Holders Notes.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the Guaranteeing
Subsidiaries covenant and agree for the equal and ratable benefit of the Holders
of the Notes as follows:

1.  CAPITALIZED TERMS.  CAPITALIZED TERMS USED HEREIN WITHOUT DEFINITION SHALL
HAVE THE MEANINGS ASSIGNED TO THEM IN THE INDENTURE.

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2.  GUARANTEE, ETC.  THE GUARANTEEING SUBSIDIARIES HEREBY AGREE THAT FROM AND
AFTER THE DATE HEREOF THEY SHALL EACH BE A GUARANTOR UNDER THE INDENTURE AND BE
BOUND BY THE TERMS THEREOF APPLICABLE TO GUARANTORS AND SHALL BE ENTITLED TO ALL
OF THE RIGHTS AND SUBJECT TO ALL THE OBLIGATIONS OF A GUARANTOR THEREUNDER.

3.  RATIFICATION OF INDENTURE; SUPPLEMENTAL INDENTURES PART OF INDENTURE.  THE
INDENTURE IS IN ALL RESPECTS RATIFIED AND CONFIRMED AND ALL THE TERMS,
CONDITIONS AND PROVISIONS THEREOF SHALL REMAIN IN FULL FORCE AND EFFECT.  THIS
SECOND SUPPLEMENTAL INDENTURE SHALL FORM A PART OF THE INDENTURE FOR ALL
PURPOSES, AND EVERY HOLDER OF NOTES HERETOFORE OR HEREAFTER AUTHENTICATED AND
DELIVERED SHALL BE BOUND HEREBY.

4.  EXECUTION AND DELIVERY.  THE GUARANTEEING SUBSIDIARIES AGREE THAT THE
SUBSIDIARY GUARANTEE GRANTED BY EACH OF THEM PURSUANT TO THE TERMS HEREOF SHALL
REMAIN IN FULL FORCE AND EFFECT NOTWITHSTANDING ANY FAILURE TO ENDORSE ON EACH
NOTE A NOTATION OF SUCH GUARANTEE.

5.  NO RECOURSE AGAINST OTHERS.  NO PAST, PRESENT OR FUTURE DIRECTOR, OFFICER,
EMPLOYEE, INCORPORATOR, STOCKHOLDER OR AGENT OF THE GUARANTEEING SUBSIDIARIES
(OR ANY SUCCESSOR ENTITY) (OTHER THAN THE COMPANY OR THE EXISTING GUARANTORS),
AS SUCH, SHALL HAVE ANY LIABILITY FOR ANY OBLIGATIONS OF THE COMPANY, TD GROUP,
THE GUARANTEEING SUBSIDIARIES OR ANY OTHER GUARANTOR UNDER THE NOTES, ANY
GUARANTEE, THE INDENTURE OR THIS SUPPLEMENTAL INDENTURE OR FOR ANY CLAIM BASED
ON, IN RESPECT OF, OR BY REASON OF, SUCH OBLIGATIONS OR THEIR CREATION.  EACH
HOLDER OF THE NOTES BY ACCEPTING A NOTE WAIVES AND RELEASES ALL SUCH LIABILITY. 
THE WAIVER AND RELEASE ARE PART OF THE CONSIDERATION FOR ISSUANCE OF THE NOTES.

6.  NEW YORK LAW TO GOVERN.  THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL
GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE AND THE SUBSIDIARY
GUARANTEE GRANTED HEREUNDER WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF
CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER
JURISDICTION WOULD BE REQUIRED THEREBY.

7.  COUNTERPART ORIGINALS.  THE PARTIES MAY SIGN ANY NUMBER OF COPIES OF THIS
SUPPLEMENTAL INDENTURE.  EACH SIGNED COPY SHALL BE AN ORIGINAL, BUT ALL OF THEM
TOGETHER REPRESENT THE SAME AGREEMENT.

8.  EFFECT OF HEADINGS.  THE SECTION HEADINGS HAVE BEEN INSERTED FOR CONVENIENCE
OF REFERENCE ONLY, ARE NOT TO BE CONSIDERED PART OF THIS SUPPLEMENTAL INDENTURE
AND SHALL IN NO WAY MODIFY OR RESTRICT ANY OF THE TERMS OR PROVISIONS HEREOF.

9.  THE TRUSTEE.  THE TRUSTEE SHALL NOT BE RESPONSIBLE IN ANY MANNER WHATSOEVER
FOR OR IN RESPECT OF THE VALIDITY OR SUFFICIENCY OF THIS SUPPLEMENTAL INDENTURE
OR FOR OR IN RESPECT OF THE RECITALS CONTAINED HEREIN, ALL OF WHICH RECITALS ARE
MADE SOLELY BY THE GUARANTEEING SUBSIDIARIES, THE EXISTING GUARANTORS AND THE
COMPANY.

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

TRANSDIGM INC.

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  VP and Chief Financial Officer

 

TRANSDIGM GROUP INCORPORATED

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  VP and Chief Financial Officer

 

 

ADAMS RITE AEROSPACE, INC.

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

 

ZMP, INC.

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

 

MARATHONNORCO AEROSPACE, INC.

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

 

CHRISTIE ELECTRIC CORP.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

 

CHAMPION AEROSPACE, INC.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

Second Supplemental Indenture

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AVIONIC INSTRUMENTS, INC.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

 

DAC REALTY CORP.

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

 

SKURKA AEROSPACE INC.

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Treasurer and Asst. Secretary

 

 

SWEENEY ENGINEERING CORP.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Secretary and Treasurer

 

 

CDA INTERCORP.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Secretary and Treasurer

 

 

AVIATION TECHNOLOGIES, INC.

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Secretary and Treasurer

 

 

AVTECH CORPORATION

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Secretary and Treasurer

 

 

TRANSICOIL CORP.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Secretary and Treasurer

 

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WEST COAST SPECIALTIES, INC.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Secretary and Treasurer

 

 

MALAYSIAN AEROSPACE SERVICES, INC.

 

 

 

 

 

 

 

By:

/s/ Gregory Rufus

 

 

Name:  Gregory Rufus

 

 

Title:  Secretary and Treasurer

 

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THE BANK OF NEW YORK TRUST
COMPANY, N.A., as Trustee

 

 

 

 

 

 

 

By:

/s/ Roxanne Ellwanger

 

 

Name: Roxanne Ellwanger

 

 

Title: Assistant Vice President

 

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