Document:

EX-4.2

 Exhibit 4.2 
 TRANSDIGM INC., 
 TRANSDIGM GROUP INCORPORATED, 

THE GUARANTORS NAMED HEREIN, 
 AND 
 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 

as Trustee 
  

 
 THIRD SUPPLEMENTAL INDENTURE

 Dated as of December 19, 2013 
 to 
 Indenture 

Dated as of October 15, 2012 
 by and among 
 TRANSDIGM INC., 

TRANSDIGM GROUP INCORPORATED, 
 THE GUARANTORS NAMED THEREIN, 
 AND 

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

5.50% Senior Subordinated Notes due 2020 
 of TransDigm Inc. 

 This THIRD SUPPLEMENTAL INDENTURE (this “Supplemental
Indenture”), dated as of December 19, 2013, by and among Aerosonic LLC, a Delaware limited liability company (“Aerosonic”), Avionics Specialties, Inc., a Virginia corporation (“Avionics
Specialties”), Airborne Global, Inc., a Delaware corporation (“Airborne Global”), Airborne Holdings, Inc., a Delaware Corporation (“Airborne Holdings”), Airborne Acquisition, Inc., a
Delaware corporation (“Airborne Acquisitions”), Airborne Systems NA Inc., a Delaware corporation (“Airborne Systems NA”), Airborne Systems North America Inc., a Delaware corporation
(“Airborne Systems North America”), Airborne Systems North America of CA Inc., a Delaware corporation (“Airborne Systems North America CA”), and Airborne Systems North America of NJ Inc., a New Jersey
corporation (collectively with Aerosonic, Avionics Specialties, Airborne Global, Airborne Holdings, Airborne Acquisition, Airborne Systems NA, Airborne Systems North America and Airborne Systems North America CA, 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”), MarathonNorco Aerospace, Inc., a Delaware corporation (“Marathon”), Champion Aerospace LLC, a Delaware limited liability company (“Champion”),
Avionic Instruments LLC, a Delaware limited liability company (“Avionic”), Skurka Aerospace Inc., a Delaware corporation (“Skurka”), CDA InterCorp LLC, a Florida limited liability company
(“CDA”), Aviation Technologies, Inc., a Delaware corporation (“ATI”), AvtechTyee, Inc., a Washington corporation (“Avtech”), Transicoil LLC, a Delaware limited liability company
(“Transicoil”), AeroControlex Group, Inc., a Delaware corporation (“AeroControlex”), Malaysian Aerospace Services, Inc., a Delaware corporation (“Malaysian”), Bruce Aerospace
Inc., a Delaware corporation (“Bruce Aerospace”), Bruce Industries, Inc., a Colorado corporation (“Bruce Industries”), CEF Industries, LLC, a Delaware limited liability company
(“CEF”), Acme Aerospace, Inc., a Delaware corporation (“Acme”), Dukes Aerospace, Inc., a Delaware corporation (“Dukes”), Semco Instruments, Inc., a Delaware corporation,
(“Semco”), Hartwell Corporation, a California corporation (“Hartwell”), McKechnie Aerospace DE, Inc., a Delaware corporation (“McKechnie Aerospace DE”), McKechnie Aerospace
Holdings, Inc., a Delaware corporation (“McKechnie Aerospace Holdings”), McKechnie Aerospace Investments, Inc., a Delaware corporation (“McKechnie Aerospace Investments”), McKechnie Aerospace US LLC, a
Delaware limited liability company (“McKechnie Aerospace US”), Texas Rotronics, Inc., a Texas corporation (“Rotronics”), Western Sky Industries, LLC, a Delaware limited liability company
(“Western”), Schneller Holdings LLC, a Delaware limited liability company (“Schneller Holdings”), Schneller LLC, a Delaware limited liability company (“Schneller”), Schneller
International Sales Corp., an Ohio corporation (“Schneller International”), Harco Laboratories, Incorporated, a Connecticut corporation (“Harco”), AmSafe Global Holdings, Inc., a Delaware corporation
(“AmSafe Global”), AP Global Holdings, Inc., a Delaware corporation (“AP Global Holdings”), AP Global Acquisition Corp., a Delaware corporation (“AP Global Acquisition”), AmSafe
Industries, Inc., a Delaware corporation (“AmSafe Industries”), Bridport Holdings, Inc., a Delaware corporation (“Bridport Holdings”), AmSafe, Inc., a Delaware corporation (“AmSafe
Inc.”), AmSafe Commercial Products, Inc., a Delaware corporation (“AmSafe Commercial”), Bridport-Air Carrier, Inc., a Washington corporation (“Bridport-Air”), Bridport Erie Aviation, Inc.,
a Delaware corporation (“Bridport Erie”), AmSafe – C Safe, Inc., a Delaware corporation (“AmSafe – C Safe”), Arkwin Industries, Inc., a New York corporation (“Arkwin”)
and Whippany Actuation Systems, LLC, a Delaware limited liability company (collectively with TD Group, Adams Rite, Marathon, Champion, Avionic, Skurka, CDA, ATI, Avtech, Transicoil, AeroControlex, Malaysian, Bruce Aerospace, Bruce Industries, CEF,
Acme, Dukes, Semco, Hartwell, McKechnie Aerospace DE, McKechnie Aerospace Holdings, McKechnie Aerospace Investments, McKechnie Aerospace US, Rotronics, Western, Schneller Holdings, Schneller, Schneller International, Harco, AmSafe Global, AP Global
Holdings, AP Global Acquisition, AmSafe Industries, Bridport Holdings, AmSafe Inc., AmSafe Commercial, Bridport-Air, Bridport Erie, AmSafe – C Safe and Arkwin, the “Existing Guarantors”), and The Bank of New York Mellon
Trust Company, N.A., as trustee (the “Trustee”) under the Indenture referred to below. Capitalized terms used herein and not otherwise defined shall have the meaning assigned to them in the Indenture. 

WITNESSETH: 
 WHEREAS, the Company and the Existing Guarantors have heretofore executed and delivered to the Trustee an indenture, dated as of October 15, 2012 (as supplemented by the First Supplemental
Indenture thereto, dated as of June 5, 2013, and the Second Supplemental Indenture thereto, dated as of June 26, 2013, the “Indenture”), providing for the issuance by the Company of 5.50% Senior Subordinated Notes
due 2020 (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 “Guarantee”); 
 WHEREAS, all things necessary to make this Supplemental
Indenture the legal, valid and binding obligation of the Company, the Existing Guarantors and the Guaranteeing Subsidiaries have been done; 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 of the Notes. 

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby
acknowledged, each of the Guaranteeing Subsidiaries 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. 

 

	 	2.	GUARANTEE, ETC. Each of the Guaranteeing Subsidiaries 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 INDENTURE 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. Each of the Guaranteeing Subsidiaries 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 any 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 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. 

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

					
	TRANSDIGM INC.
		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Executive Vice President, Chief Financial Officer and Secretary
	
	TRANSDIGM GROUP INCORPORATED
		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Executive Vice President, Chief Financial Officer and Secretary

 
					
	ACME AEROSPACE, INC.
	ADAMS RITE AEROSPACE, INC.
	AEROCONTROLEX GROUP, INC.
	AIRBORNE ACQUISITION, INC.
	AIRBORNE GLOBAL, INC.
	AIRBORNE HOLDINGS, INC.
	AIRBORNE SYSTEMS NA INC.
	AIRBORNE SYSTEMS NORTH AMERICA INC.
	AIRBORNE SYSTEMS NORTH AMERICA OF CA INC.
	AIRBORNE SYSTEMS NORTH AMERICA OF NJ INC.
	AMSAFE – C SAFE, INC.
	AMSAFE COMMERCIAL PRODUCTS, INC.
	AMSAFE GLOBAL HOLDINGS, INC.
	AMSAFE, INC.
	AMSAFE INDUSTRIES, INC.
	AP GLOBAL ACQUISITION CORP.
	AP GLOBAL HOLDINGS, INC.
	ARKWIN INDUSTRIES, INC.
	AVIATION TECHNOLOGIES, INC.
	AVIONICS SPECIALTIES, INC.
	AVTECHTYEE, INC.
	BRIDPORT-AIR CARRIER, INC.
	BRIDPORT ERIE AVIATION, INC.
	BRIDPORT HOLDINGS, INC.
	BRUCE AEROSPACE INC.
	BRUCE INDUSTRIES, INC.
	DUKES AEROSPACE, INC.
	HARTWELL CORPORATION
	HARCO LABORATORIES, INCORPORATED
	MALAYSIAN AEROSPACE SERVICES, INC.
	MARATHONNORCO AEROSPACE, INC.
	MCKECHNIE AEROSPACE DE, INC.
	MCKECHNIE AEROSPACE HOLDINGS, INC.
	MCKECHNIE AEROSPACE INVESTMENTS, INC.
	MCKECHNIE AEROSPACE US LLC
		 	By:	 	McKechnie Aerospace DE, Inc., its sole member
	SCHNELLER INTERNATIONAL SALES CORP.
	SEMCO INSTRUMENTS, INC.
	SKURKA AEROSPACE INC.
	TEXAS ROTRONICS, INC.
	TRANSICOIL LLC
		 	By:	 	Aviation Technologies, Inc., its sole member
	WESTERN SKY INDUSTRIES, LLC
		 	By:	 	McKechnie Aerospace Investments, Inc.,
		 		 	its sole member
		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Treasurer and Secretary

 
					
	 AEROSONIC LLC

AVIONIC INSTRUMENTS LLC
 CDA INTERCORP
LLC
 CEF INDUSTRIES, LLC
 CHAMPION
AEROSPACE LLC
 SCHNELLER HOLDINGS LLC

SCHNELLER LLC

		 	By:	 	Schneller Holdings LLC, its sole member
	WHIPPANY ACTUATION SYSTEMS, LLC
		
	By:	 	TransDigm Inc., its sole member
		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Executive Vice President, Chief Financial Officer and Secretary

 
					
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS TRUSTEE
		
	By:	 	 /s/ Lawrence M. Kusch

		 	Name:	 	Lawrence M. Kusch
		 	Title:	 	Vice PresidentEX-4.3

 Exhibit 4.3 
 TRANSDIGM INC., 
 TRANSDIGM GROUP INCORPORATED, 

THE GUARANTORS NAMED HEREIN, 
 AND 
 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 

as Trustee 
  

 
 FIRST SUPPLEMENTAL INDENTURE

 Dated as of December 19, 2013 
 to 
 Indenture 

Dated as of July 1, 2013 
 by and among 
 TRANSDIGM INC., 

TRANSDIGM GROUP INCORPORATED, 
 THE GUARANTORS NAMED THEREIN, 
 AND 

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

7.50% Senior Subordinated Notes due 2021 
 of TransDigm Inc. 

 This FIRST SUPPLEMENTAL INDENTURE (this “Supplemental
Indenture”), dated as of December 19, 2013, by and among Aerosonic LLC, a Delaware limited liability company (“Aerosonic”), Avionics Specialties, Inc., a Virginia corporation (“Avionics
Specialties”), Airborne Global, Inc., a Delaware corporation (“Airborne Global”), Airborne Holdings, Inc., a Delaware Corporation (“Airborne Holdings”), Airborne Acquisition, Inc., a
Delaware corporation (“Airborne Acquisitions”), Airborne Systems NA Inc., a Delaware corporation (“Airborne Systems NA”), Airborne Systems North America Inc., a Delaware corporation
(“Airborne Systems North America”), Airborne Systems North America of CA Inc., a Delaware corporation (“Airborne Systems North America CA”), and Airborne Systems North America of NJ Inc., a New Jersey
corporation (collectively with Aerosonic, Avionics Specialties, Airborne Global, Airborne Holdings, Airborne Acquisition, Airborne Systems NA, Airborne Systems North America and Airborne Systems North America CA, 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”), MarathonNorco Aerospace, Inc., a Delaware corporation (“Marathon”), Champion Aerospace LLC, a Delaware limited liability company (“Champion”),
Avionic Instruments LLC, a Delaware limited liability company (“Avionic”), Skurka Aerospace Inc., a Delaware corporation (“Skurka”), CDA InterCorp LLC, a Florida limited liability company
(“CDA”), Aviation Technologies, Inc., a Delaware corporation (“ATI”), AvtechTyee, Inc., a Washington corporation (“Avtech”), Transicoil LLC, a Delaware limited liability company
(“Transicoil”), AeroControlex Group, Inc., a Delaware corporation (“AeroControlex”), Malaysian Aerospace Services, Inc., a Delaware corporation (“Malaysian”), Bruce Aerospace
Inc., a Delaware corporation (“Bruce Aerospace”), Bruce Industries, Inc., a Colorado corporation (“Bruce Industries”), CEF Industries, LLC, a Delaware limited liability company
(“CEF”), Acme Aerospace, Inc., a Delaware corporation (“Acme”), Dukes Aerospace, Inc., a Delaware corporation (“Dukes”), Semco Instruments, Inc., a Delaware corporation,
(“Semco”), Hartwell Corporation, a California corporation (“Hartwell”), McKechnie Aerospace DE, Inc., a Delaware corporation (“McKechnie Aerospace DE”), McKechnie Aerospace
Holdings, Inc., a Delaware corporation (“McKechnie Aerospace Holdings”), McKechnie Aerospace Investments, Inc., a Delaware corporation (“McKechnie Aerospace Investments”), McKechnie Aerospace US LLC, a
Delaware limited liability company (“McKechnie Aerospace US”), Texas Rotronics, Inc., a Texas corporation (“Rotronics”), Western Sky Industries, LLC, a Delaware limited liability company
(“Western”), Schneller Holdings LLC, a Delaware limited liability company (“Schneller Holdings”), Schneller LLC, a Delaware limited liability company (“Schneller”), Schneller
International Sales Corp., an Ohio corporation (“Schneller International”), Harco Laboratories, Incorporated, a Connecticut corporation (“Harco”), AmSafe Global Holdings, Inc., a Delaware corporation
(“AmSafe Global”), AP Global Holdings, Inc., a Delaware corporation (“AP Global Holdings”), AP Global Acquisition Corp., a Delaware corporation (“AP Global Acquisition”), AmSafe
Industries, Inc., a Delaware corporation (“AmSafe Industries”), Bridport Holdings, Inc., a Delaware corporation (“Bridport Holdings”), AmSafe, Inc., a Delaware corporation (“AmSafe
Inc.”), AmSafe Commercial Products, Inc., a Delaware corporation (“AmSafe Commercial”), Bridport-Air Carrier, Inc., a Washington corporation (“Bridport-Air”), Bridport Erie Aviation, Inc.,
a Delaware corporation (“Bridport Erie”), AmSafe – C Safe, Inc., a Delaware corporation (“AmSafe – C Safe”), Arkwin Industries, Inc., a New York corporation (“Arkwin”)
and Whippany Actuation Systems, LLC, a Delaware limited liability company (collectively with TD Group, Adams Rite, Marathon, Champion, Avionic, Skurka, CDA, ATI, Avtech, Transicoil, AeroControlex, Malaysian, Bruce Aerospace, Bruce Industries, CEF,
Acme, Dukes, Semco, Hartwell, McKechnie Aerospace DE, McKechnie Aerospace Holdings, McKechnie Aerospace Investments, McKechnie Aerospace US, Rotronics, Western, Schneller Holdings, Schneller, Schneller International, Harco, AmSafe Global, AP Global
Holdings, AP Global Acquisition, AmSafe Industries, Bridport Holdings, AmSafe Inc., AmSafe Commercial, Bridport-Air, Bridport Erie, AmSafe – C Safe and Arkwin, the “Existing Guarantors”), and The Bank of New York Mellon
Trust Company, N.A., as trustee (the “Trustee”) under the Indenture referred to below. Capitalized terms used herein and not otherwise defined shall have the meaning assigned to them in the Indenture. 

WITNESSETH: 
 WHEREAS, the Company and the Existing Guarantors have heretofore executed and delivered to the Trustee an indenture, dated as of July 1, 2013 (the “Indenture”),
providing for the issuance by the Company of 7.50% Senior Subordinated Notes due 2021 (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 “Guarantee”); 

WHEREAS, all things necessary to make this Supplemental Indenture the legal, valid and binding obligation of the Company, the
Existing Guarantors and the Guaranteeing Subsidiaries have been done; 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 of the Notes. 
 NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, each of the Guaranteeing Subsidiaries 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. 

 

	 	2.	GUARANTEE, ETC. Each of the Guaranteeing Subsidiaries 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 INDENTURE 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. Each of the Guaranteeing Subsidiaries 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 any 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 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. 

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

					
	TRANSDIGM INC.
		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Executive Vice President, Chief Financial Officer and Secretary
	
	TRANSDIGM GROUP INCORPORATED
		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Executive Vice President, Chief Financial Officer and Secretary

 
					
	 ACME AEROSPACE, INC.

ADAMS RITE AEROSPACE, INC.
 AEROCONTROLEX GROUP,
INC.
 AIRBORNE ACQUISITION, INC.

AIRBORNE GLOBAL, INC.
 AIRBORNE HOLDINGS,
INC.
 AIRBORNE SYSTEMS NA INC.

AIRBORNE SYSTEMS NORTH AMERICA INC.
 AIRBORNE
SYSTEMS NORTH AMERICA OF CA INC.
 AIRBORNE SYSTEMS NORTH AMERICA OF NJ INC.
 AMSAFE – C SAFE, INC.
 AMSAFE COMMERCIAL PRODUCTS, INC.

AMSAFE GLOBAL HOLDINGS, INC.
 AMSAFE,
INC.
 AMSAFE INDUSTRIES, INC.
 AP
GLOBAL ACQUISITION CORP.
 AP GLOBAL HOLDINGS, INC.
 ARKWIN INDUSTRIES, INC.
 AVIATION TECHNOLOGIES, INC.

AVIONICS SPECIALTIES, INC.
 AVTECHTYEE,
INC.
 BRIDPORT-AIR CARRIER, INC.

BRIDPORT ERIE AVIATION, INC.
 BRIDPORT HOLDINGS,
INC.
 BRUCE AEROSPACE INC.
 BRUCE
INDUSTRIES, INC.
 DUKES AEROSPACE, INC.

HARTWELL CORPORATION
 HARCO LABORATORIES,
INCORPORATED
 MALAYSIAN AEROSPACE SERVICES, INC.
 MARATHONNORCO AEROSPACE, INC.
 MCKECHNIE AEROSPACE DE, INC.

MCKECHNIE AEROSPACE HOLDINGS, INC.

MCKECHNIE AEROSPACE INVESTMENTS, INC.
 MCKECHNIE AEROSPACE US LLC

		 	By:	 	McKechnie Aerospace DE, Inc., its sole member
	 SCHNELLER INTERNATIONAL SALES CORP.
 SEMCO INSTRUMENTS, INC.
 SKURKA AEROSPACE INC.

TEXAS ROTRONICS, INC.
 TRANSICOIL
LLC

		 	By:	 	Aviation Technologies, Inc., its sole member
	WESTERN SKY INDUSTRIES, LLC
		 	By:	 	 McKechnie Aerospace Investments, Inc.,
 its sole member

		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Treasurer and Secretary

					
	 AEROSONIC LLC

AVIONIC INSTRUMENTS LLC
 CDA INTERCORP
LLC
 CEF INDUSTRIES, LLC
 CHAMPION
AEROSPACE LLC
 SCHNELLER HOLDINGS LLC

SCHNELLER LLC

		 	By:	 	Schneller Holdings LLC, its sole member
	WHIPPANY ACTUATION SYSTEMS, LLC
		
	By:	 	TransDigm Inc., its sole member
		
	By:	 	 /s/ Gregory Rufus

		 	Name:	 	Gregory Rufus
		 	Title:	 	Executive Vice President, Chief Financial Officer and Secretary

 
					
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS TRUSTEE
		
	By:	 	 /s/ Lawrence M. Kusch

		 	Name:	 	Lawrence M. Kusch
		 	Title:	 	Vice President

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