Document:

EX-10.1

 Exhibit 10.1 
 JOINDER AGREEMENT 
 THIS JOINDER AGREEMENT (this “Agreement”),
dated as of September 14, 2012, is entered into between Aero-Instruments Co., LLC, an Ohio limited liability company (the “New Subsidiary”), and CREDIT SUISSE AG, as administrative agent and collateral agent (in such
capacities, the “Agent”), under that certain Credit Agreement, dated as of December 6, 2010 (as the same may be amended, supplemented or otherwise modified from time to time, the “Credit Agreement”), among
TransDigm Inc., a Delaware corporation (the “Borrower”), TransDigm Group Incorporated, a Delaware corporation, the Subsidiaries of the Borrower from time to time party thereto, the Lenders from time to time party thereto and the
Agent. All capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Credit Agreement. 

The New Subsidiary and the Agent, for the benefit of the Lenders, hereby agree as follows: 

1. The New Subsidiary hereby acknowledges, agrees and confirms that, by its execution of this Agreement, the New Subsidiary will be
deemed to be a Loan Party under the Credit Agreement and a Loan Guarantor for all purposes of the Credit Agreement and shall have all of the obligations of a Loan Party and a Subsidiary Guarantor thereunder as if it had executed the Credit
Agreement. The New Subsidiary hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions and conditions contained in the Credit Agreement, including without limitation (a) all of the representations and
warranties of the Loan Parties set forth in Article III of the Credit Agreement (to the extent made or deemed made on or after the effective date hereof), (b) all of the covenants set forth in Articles V and VI of the Credit Agreement and
(c) all of the guaranty obligations set forth in the Guarantee and Collateral Agreement. Without limiting the generality of the foregoing terms of this paragraph 1, the New Subsidiary, subject to the limitations set forth in the Guarantee and
Collateral Agreement, hereby absolutely and unconditionally guarantees, jointly and severally with the other Guarantors, to the Agent and the Lenders, the prompt payment of the Additional Obligations in full when due (whether at stated maturity,
upon acceleration or otherwise) to the extent of and in accordance with Guarantee and Collateral Agreement. 
 2. If required,
the New Subsidiary is, simultaneously with the execution of this Agreement, executing and delivering such Collateral Documents (and such other documents and instruments) as reasonably requested by the Agent in accordance with the Credit Agreement.

 3. The New Subsidiary hereby waives acceptance by the Agent and the Lenders of the guaranty by the New Subsidiary upon the
execution of this Agreement by the New Subsidiary. 
 4. This Agreement may be executed in any number of counterparts, each of
which when so executed and delivered shall be an original, but all of which shall constitute one and the same instrument. 
 5.
THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK. 

 IN WITNESS WHEREOF, the New Subsidiary has caused this Agreement to be duly executed by its
authorized officer, and the Agent, for the benefit of the Lenders, has caused the same to be accepted by its authorized officer, as of the day and year first above written. 

 

					
	AERO-INSTRUMENTS CO., LLC
			
		 	    by	 	/s/ Gregory Rufus
		 		 	  

		 		 	Name: Gregory Rufus
		 		 	Title:   Treasurer and Secretary

  

			
	Acknowledged and accepted:
	
	CREDIT SUISSE AG, as Agent
		
	         by
	 	/s/ Robert Hetu
		 	  

		 	Name: Robert Hetu
		 	Title:   Managing Director
		
	        by	 	 /s/ Kevin Buddhdew

		 	Name: Kevin Buddhdew
		 	Title: AssociateEX-10.2

 Exhibit 10.2 
 JOINDER AGREEMENT 
 THIS JOINDER AGREEMENT (this “Agreement”),
dated as of September 14, 2012, is entered into between Aero-Instruments Co., LLC, an Ohio limited liability company (the “New Subsidiary”), and CREDIT SUISSE AG, as administrative agent and collateral agent (in such
capacities, the “Agent”), under that certain Credit Agreement, dated as of February 14, 2011 (as the same may be amended, supplemented or otherwise modified from time to time, the “Credit Agreement”), among
TransDigm Inc., a Delaware corporation (the “Borrower”), TransDigm Group Incorporated, a Delaware corporation, the Subsidiaries of the Borrower from time to time party thereto, the Lenders from time to time party thereto and the
Agent. All capitalized terms used herein and not otherwise defined shall have the meanings set forth in the Credit Agreement. 

The New Subsidiary and the Agent, for the benefit of the Lenders, hereby agree as follows: 

1. The New Subsidiary hereby acknowledges, agrees and confirms that, by its execution of this Agreement, the New Subsidiary will be
deemed to be a Loan Party under the Credit Agreement and a Loan Guarantor for all purposes of the Credit Agreement and shall have all of the obligations of a Loan Party and a Subsidiary Guarantor thereunder as if it had executed the Credit
Agreement. The New Subsidiary hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions and conditions contained in the Credit Agreement, including without limitation (a) all of the representations and
warranties of the Loan Parties set forth in Article III of the Credit Agreement (to the extent made or deemed made on or after the effective date hereof), (b) all of the covenants set forth in Articles V and VI of the Credit Agreement and
(c) all of the guaranty obligations set forth in the Guarantee and Collateral Agreement. Without limiting the generality of the foregoing terms of this paragraph 1, the New Subsidiary, subject to the limitations set forth in the Guarantee and
Collateral Agreement, hereby absolutely and unconditionally guarantees, jointly and severally with the other Guarantors, to the Agent and the Lenders, the prompt payment of the Additional Obligations in full when due (whether at stated maturity,
upon acceleration or otherwise) to the extent of and in accordance with Guarantee and Collateral Agreement. 
 2. If required,
the New Subsidiary is, simultaneously with the execution of this Agreement, executing and delivering such Collateral Documents (and such other documents and instruments) as reasonably requested by the Agent in accordance with the Credit Agreement.

 3. The New Subsidiary hereby waives acceptance by the Agent and the Lenders of the guaranty by the New Subsidiary upon the
execution of this Agreement by the New Subsidiary. 
 4. This Agreement may be executed in any number of counterparts, each of
which when so executed and delivered shall be an original, but all of which shall constitute one and the same instrument. 
 5.
THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK. 

 IN WITNESS WHEREOF, the New Subsidiary has caused this Agreement to be duly executed by its
authorized officer, and the Agent, for the benefit of the Lenders, has caused the same to be accepted by its authorized officer, as of the day and year first above written. 

 

			
	AERO-INSTRUMENTS CO., LLC
		
	        by	 	/s/ Gregory Rufus
		 	  

		 	Name: Gregory Rufus
		 	Title:   Treasurer and Secretary

  

			
	Acknowledged and accepted:
	
	    CREDIT SUISSE AG, as Agent
		
	         by
	 	/s/ Robert Hetu
		 	  

		 	Name: Robert Hetu
		 	Title: Managing Director
		
	        by	 	/s/ Kevin Buddhdew
		 	Name: Kevin Buddhdew
		 	Title: AssociateEX-10.3

 Exhibit 10.3 
 SUPPLEMENT NO. 4 dated as of September 14, 2012 (this “Supplement”) to the Guarantee and Collateral Agreement dated as of June 23, 2006, as amended and restated as of
December 6, 2010, and as further amended and restated as of February 14, 2011 (as amended and supplemented from time to time, the “Guarantee and Collateral Agreement”), among TRANSDIGM INC., a Delaware corporation (the
“Borrower”), TRANSDIGM GROUP INCORPORATED, a Delaware corporation (“Holdings”), each subsidiary of the Borrower listed on Schedule I thereto (each such subsidiary individually a “Subsidiary
Guarantor” and collectively, the “Subsidiary Guarantors”; the Subsidiary Guarantors, Holdings and the Borrower are referred to collectively herein as the “Grantors”) and CREDIT SUISSE AG, as collateral
agent for the Secured Parties and as administrative agent under each of the 2010 Credit Agreement and the 2011 Credit Agreement (each as defined below) (in such capacities, the “Agent”). 

A. Reference is made to (a) the Credit Agreement dated as of December 6, 2010 (as amended, supplemented or otherwise modified
from time to time, the “2010 Credit Agreement”), among the Borrower, Holdings, each subsidiary of the Borrower from time to time party thereto, the lenders from time to time party thereto (the “2010 Lenders”) and
the Agent and (b) the Credit Agreement dated as of February 14, 2011 (as amended, supplemented or otherwise modified from time to time, the “2011 Credit Agreement” and, together with the 2010 Credit Agreement, the
“Credit Agreements”), among the Borrower, Holdings, each subsidiary of the Borrower from time to time party thereto, the lenders from time to time party thereto (the “2011 Lenders” and, together with the 2010
Lenders, the “Lenders”) and the Agent. 
 B. Capitalized terms used herein and not otherwise defined herein
shall have the meanings assigned to such terms in the 2010 Credit Agreement, the 2011 Credit Agreement or the Guarantee and Collateral Agreement, as the context may require. 
 C. The Grantors have entered into the Guarantee and Collateral Agreement in order to induce the Lenders to make Loans and the 2010 Issuing Banks to issue Letters of Credit. Section 7.16 of the
Guarantee and Collateral Agreement provides that additional Domestic Subsidiaries of the Loan Parties may become Subsidiary Guarantors and Grantors under the Guarantee and Collateral Agreement by execution and delivery of an instrument in the form
of this Supplement. The undersigned Subsidiary (the “New Subsidiary”) is executing this Supplement in accordance with the requirements of the applicable Credit Agreement to become a Subsidiary Guarantor and a Grantor under the
Guarantee and Collateral Agreement in order to induce the Lenders to make additional Loans and the 2010 Issuing Banks to issue additional Letters of Credit, and as consideration for Loans previously made and Letters of Credit previously issued.

 Accordingly, the Agent and the New Subsidiary agree as follows: 

SECTION 1. In accordance with Section 7.16 of the Guarantee and Collateral Agreement, the New Subsidiary by its signature below
becomes a Grantor and Subsidiary Guarantor under the Guarantee and Collateral Agreement with the same force and effect as if originally named therein as a Grantor and Subsidiary Guarantor, and the New Subsidiary hereby (a) agrees to all the
terms and provisions of the Guarantee and Collateral Agreement applicable to it as a Grantor and Subsidiary Guarantor thereunder and (b) represents and warrants that the 

 
representations and warranties made by it as a Grantor and Subsidiary Guarantor thereunder are true and correct in all material respects on and as of the date hereof (except for any
representation or warranty that is limited by its terms to an earlier specified date). In furtherance of the foregoing, the New Subsidiary, as security for the payment and performance in full of the Secured Obligations (as defined in the Guarantee
and Collateral Agreement), does hereby create and grant to the Agent, its successors and assigns, for the ratable benefit of the Secured Parties, their successors and assigns, a security interest in and lien on all of the New Subsidiary’s
right, title and interest in and to the Collateral (as defined in the Guarantee and Collateral Agreement) of the New Subsidiary. Each reference to a “Grantor” or a “Subsidiary Guarantor” in the Guarantee and
Collateral Agreement shall be deemed to include the New Subsidiary. The Guarantee and Collateral Agreement is hereby incorporated herein by reference. 
 SECTION 2. The New Subsidiary represents and warrants to the Agent and the other Secured Parties that this Supplement has been duly authorized, executed and delivered by it and constitutes its legal,
valid and binding obligation, enforceable against it in accordance with its terms subject to applicable bankruptcy, insolvency or similar laws affecting creditors’ rights generally and to general principles of equity. 

SECTION 3. This Supplement may be executed in counterparts (and by different parties hereto on different counterparts), each of which
shall constitute an original, but all of which when taken together shall constitute a single contract. This Supplement shall become effective when the Agent shall have received counterparts of this Supplement that, when taken together, bear the
signatures of the New Subsidiary and the Agent. Delivery of an executed signature page to this Supplement by facsimile or other electronic transmission shall be as effective as delivery of a manually signed counterpart of this Supplement.

 SECTION 4. The New Subsidiary hereby represents and warrants that (a) set forth on Schedule I attached hereto is a true
and correct schedule of all leased and owned real property of the New Subsidiary and each other location where any Collateral of the New Subsidiary with a value in excess of $300,000 is stored or otherwise located, set forth on Schedule II is a
true and correct schedule of the Pledged Collateral of the New Subsidiary and set forth on Schedule III is a true and correct schedule of the Intellectual Property of the New Subsidiary, and (b) set forth under its signature hereto, is the
true and correct legal name of the New Subsidiary, its jurisdiction of formation and the location of its chief executive office. 
 SECTION 5. Except as expressly supplemented hereby, the Guarantee and Collateral Agreement shall remain in full force and effect. 
 SECTION 6. THIS SUPPLEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 
 SECTION 7. In case any one or more of the provisions contained in this Supplement should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained herein and in the Guarantee and Collateral Agreement shall not in any way be affected or impaired thereby (it being understood that the invalidity of a particular provision in a particular jurisdiction shall not in and
of itself 

 
affect the validity of such provision in any other jurisdiction). The parties hereto shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with
valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions. 
 SECTION 8. All communications and notices hereunder shall be in writing and given as provided in Section 7.01 of the Guarantee and Collateral Agreement. All communications and notices hereunder to
the New Subsidiary shall be given to it at the address set forth under its signature below. 
 SECTION 9. The New Subsidiary
agrees to reimburse the Agent for its reasonable out-of-pocket expenses in connection with this Supplement, including the reasonable fees, other charges and disbursements of counsel for the Agent. 

 IN WITNESS WHEREOF, the New Subsidiary and the Agent have duly executed this Supplement to
the Guarantee and Collateral Agreement as of the day and year first above written. 
  

					
	AERO-INSTRUMENTS CO., LLC, as the New
Subsidiary
		
	by	 	 /s/ Gregory Rufus

		 	Name: Gregory Rufus
		 	Title: Treasurer and Secretary
		 	 Address: 14901 Emery Avenue
   Cleveland, Ohio 44135

		 	Legal Name: Aero-Instruments Co., LLC
		 	Jurisdiction of Formation: Ohio
		 	 Location of Chief

Executive Office: 14901 Emery Avenue
 Cleveland, Ohio 44135

 
			
	 CREDIT SUISSE AG, CAYMAN
 ISLANDS BRANCH, as Agent

		
	by	 	 /s/ Robert Hetu

		 	Name: Robert Hetu
		 	Title:   Managing Director
		
	by	 	 /s/ Kevin Buddhdew

		 	Name: Kevin Buddhdew
		 	Title:   Associate

 Schedule I 

Subsidiary Guarantors 
  

							
	 Exact Legal Name
	  	 Jurisdiction
	  	 Organizational
 Identification

Number
	  	 Federal Taxpayer
 Identification

Number

	 Aero-Instruments Co., LLC
	  	Ohio	  	1242087	  	34-1961289

 Locations of Collateral 

 

	 	1.	14835 Emery Avenue, Cleveland, Ohio. 

  

	 	2.	14901 Emery Avenue, Cleveland, Ohio. 

  

	 	3.	1324 Hird Avenue, Lakewood, Ohio. 

  

	 	4.	4081 W. 150th Street, Cleveland, Ohio. 

 Schedule II 

Capital Stock 
 None 
 Pledged Debt Securities 

None 

 Schedule III 

Intellectual Property 
 Patents 
  

							
	 COUNTRY
	 	 PATENT TITLE
	 	 PATENT NO.
	 	 ISSUE DATE

	 U.S.
	 	NOSE SECTION FOR A PITOT PROBE	 	7,549,331 B1	 	6/23/09
	 U.S.
	 	TEMPERATURE PROBE	 	8,100,582 B1	 	1/24/12

 Trademarks 
  

											
	 COUNTRY
	 	 TRADEMARK
	 	 APPL. NO.
	 	 APPL. DATE
	 	 REG. NO.
	 	 REG. DATE

	 U.S.
	 	FLY TRUE	 	77/215,267	 	6/26/07	 	3,437,419	 	5/27/08
	 U.S.
	 	AERO-INSTRUMENTS & DESIGN	 	77/223,165	 	7/6/07	 	3,465,951	 	7/15/08

 Copyrights 
 None 
 Licenses 

 

							
	 LICENSED PRODUCT
	 	 EFFECTIVE DATE
	 	 EXPIRATION DATE
	 	 LICENSOR NAME

	 ANSYS FLUENT
	 	9/28/11	 	9/27/12	 	ANSYS, Inc.
	 ANSYS Geometry Interface for Creo Parametric
	 	9/28/11	 	9/27/12	 	ANSYS, Inc.
	 ANSYS DesignModeler
	 	9/28/11	 	9/27/12	 	ANSYS, Inc.
	 ANSYS HPC Pack
	 	9/28/11	 	9/27/12	 	ANSYS, Inc.

 Schedule IV 

Commercial Tort Claims 
 None.

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