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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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THIRD SUPPLEMENTAL INDENTURE

Dated as of June 29, 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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73/4% Senior Subordinated Notes due 2014

of TransDigm Inc.

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THIRD SUPPLEMENTAL INDENTURE

        THIRD SUPPLEMENTAL INDENTURE (this "SUPPLEMENTAL INDENTURE"), dated as
of June 29, 2007, among AeroControlex Group, Inc., a Delaware corporation (the
"GUARANTEEING SUBSIDIARY"), 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"), CDA
InterCorp., a Florida corporation ("CDA"), Aviation Technologies, Inc. ("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 TD Group, Adams Rite, ZMP, Marathon,
Christie, Champion, Avionic, DAC, Skurka, Sweeney, CDA, ATI, Avtech, Transicoil,
West Coast and Malaysian, 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, and the Second
Supplemental Indenture, dated as of February 7, 2007, the "INDENTURE"), dated as
of June 23, 2006, providing for the issuance by the Company of 73/4% 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 Subsidiary covenants and agrees 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 Subsidiary hereby agrees that
from and after the date hereof it shall 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 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 Subsidiary agrees that
the Guarantee granted by it 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
Subsidiary (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 Subsidiary 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
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 Subsidiary, the Existing Guarantors
and the Company.

[The remainder of this page is intentionally left blank.]

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

 
TRANSDIGM INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: VP and Chief Financial Officer
 
TRANSDIGM GROUP INCORPORATED
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: VP and Chief Financial Officer
 
ADAMS RITE AEROSPACE, INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary
 
ZMP, Inc.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary
 
MARATHONNORCO AEROSPACE, INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary
 
CHRISTIE ELECTRIC CORP.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary
 
CHAMPION AEROSPACE, INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary

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AVIONIC INSTRUMENTS, INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary
 
DAC REALTY CORP.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary
 
SKURKA AEROSPACE INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Treasurer and Asst. Secretary
 
SWEENEY ENGINEERING CORP.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Secretary and Treasurer
 
CDA INTERCORP.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Secretary and Treasurer
 
AVIATION TECHNOLOGIES, INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Secretary and Treasurer
 
AVTECH CORPORATION
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Secretary and Treasurer
 
TRANSICOIL CORP.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Secretary and Treasurer

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WEST COAST SPECIALTIES, INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Secretary and Treasurer
 
MALAYSIAN AEROSPACE SERVICES, INC.
 
By:
/s/  GREGORY RUFUS      

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    Name: Gregory Rufus     Title: Secretary and Treasurer
 
AEROCONTROLEX GROUP, INC.
 
By:
/s/  GREGORY RUFUS      

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    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 J. ELLWANGER      

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    Name: Roxanne J. Ellwanger     Title: Asst. Vice President

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W I T N E S S E T H