Document:

EX-4.3

 Exhibit 4.3 

EXECUTION VERSION 
 SEVENTH
SUPPLEMENTAL INDENTURE 
 SEVENTH SUPPLEMENTAL INDENTURE (this “Seventh Supplemental Indenture”), dated as of
October 31, 2016, among L-3 Communications Corporation (or its permitted successor), a Delaware corporation (the “Company”), each direct or indirect subsidiary of the Company signatory
hereto (each, a “Guaranteeing Subsidiary”, and collectively, the “Guaranteeing Subsidiaries”), and The Bank of New York Mellon 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 Guaranteeing Subsidiaries party thereto have heretofore executed and delivered to the Trustee (1) an
indenture dated May 21, 2010 (the “Base Indenture”), (2) a first supplemental indenture dated as of May 21, 2010 (the “First Supplemental Indenture”), providing for the issuance of $800,000,000 4.750% Senior Notes
due 2020 (the “2020 Notes”) , (3) a second supplemental indenture dated as of February 7, 2011 (the “Second Supplemental Indenture”), providing for the issuance of $650,000,000 4.95% Senior Notes due 2021 (the
“2021 Notes”), (4) a third supplemental indenture dated as of November 22, 2011 (the “Third Supplemental Indenture”), providing for the issuance of $500,000,000 3.95% Senior Notes due 2016 (the “2016 Notes”),
(5) a fourth supplemental indenture dated as of February 3, 2012 (the “Fourth Supplemental Indenture”), providing for the accession of certain Guaranteeing Subsidiaries, (6) a fifth supplemental indenture dated as of
May 28, 2014 (the “Fifth Supplemental Indenture”), providing for the issuance of $350,000,000 1.50% Senior Notes due 2017 (the “2017 Notes”) and the issuance of $650,000,000 3.95% Senior Notes due 2024 (the “2024
Notes”, together with the 2020 Notes, the 2021 Notes, the 2016 Notes, the 2017 Notes and the 2024 Notes, collectively, the “Notes”) and (7) a sixth supplemental indenture dated as of June 21, 2016 (the “Sixth
Supplemental Indenture”, together with the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture, the Fifth Supplemental Indenture, the Sixth Supplemental Indenture
and the Base Indenture, collectively, the “Indenture”), effecting certain amendments to the Indenture; 
 WHEREAS, the Indenture
provides that under certain circumstances the Guaranteeing Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guaranteeing Subsidiaries shall unconditionally guarantee all of the Company’s
Obligations (as defined in the Indenture) under the Notes and the Indenture on the terms and conditions set forth herein (the “Subsidiary Guarantee”); and 

WHEREAS, pursuant to Section 9.1 of the Indenture, the Trustee is authorized to execute and deliver this Seventh Supplemental Indenture.

 NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby
acknowledged, the parties mutually 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. 

	 	2.	SUBSIDIARY GUARANTOR. The Guaranteeing Subsidiaries hereby agree to each be Guarantors under the Indenture and to be bound by, and in accordance with, the terms of the Indenture applicable to Guarantors,
including Article 10 thereof. 

  

	 	3.	RELEASES. The Guarantees of the Guaranteeing Subsidiaries shall be unconditionally released and discharged as provided in Section 10.4 of the Indenture. 

 

	 	4.	NO RECOURSE AGAINST OTHERS. No past, present or future director, officer, employee, incorporator, stockholder or agent of any Guarantor, as such, shall have any liability for any Obligations of the Company or any
Guarantor under the Notes, any Guarantee, the Indenture or this Seventh 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. Such waiver may not be effective to waive liabilities under the federal securities laws and it is the view of the SEC that such a waiver is
against public policy. 

  

	 	5.	NEW YORK LAW TO GOVERN. THIS SEVENTH SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 

 

	 	6.	COUNTERPARTS. The parties may sign any number of copies of this Seventh Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. 

 

	 	7.	EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof. 

  

	 	8.	THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Seventh Supplemental Indenture or for or in respect of the recitals contained
herein, all of which recitals are made solely by the Guaranteeing Subsidiaries and the Company. 

  

	 	9.	BENEFITS ACKNOWLEDGED. Each Guaranteeing Subsidiary’s Guarantee is subject to the terms and conditions set forth in the Indenture. Each Guaranteeing Subsidiary acknowledges that it will receive direct and
indirect benefits from the financing arrangements contemplated by the Indenture and this Seventh Supplemental Indenture and that the guarantee and waivers made by it pursuant to this Guarantee are knowingly made in contemplation of such benefits.

  

	 	10.	SUCCESSORS. All agreements of the Guaranteeing Subsidiaries in this Seventh Supplemental Indenture shall bind its successors, except as otherwise provided in Section 10.4 of the Indenture. All agreements of
the Trustee in this Seventh Supplemental Indenture shall bind its successors. 

  
 2 

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

							
	Dated: October 31, 2016	 	 	 	L-3 COMMUNICATIONS CORPORATION
				
		 		 	By:	 	/s/ Stephen M. Souza
		 		 		 	  

		 		 		 	 Name:  Stephen M. Souza

Title:    Vice President and Treasurer

  
 [Signature Page to Seventh
Supplemental Indenture] 

 Electrodynamics, Inc. 

Interstate Electronics Corporation 
 L-3 Advanced Programs, Inc.

 L-3 Applied Technologies, Inc. 
 L-3 Chesapeake Sciences
Corporation 
 L-3 Communications AIS GP Corporation 
 L-3
Communications Avionics Systems, Inc. 
 L-3 Communications Cincinnati Electronics Corporation 

L-3 Communications Electron Technologies, Inc. 
 L-3
Communications EO/IR, Inc. 
 L-3 Communications ESSCO, Inc. 

L-3 Communications Flight Capital LLC 
 L-3 Communications Flight
International Aviation LLC 
 L-3 Communications Foreign Holdings, Inc. 

L-3 Communications Investments Inc. 
 L-3 Communications MariPro,
Inc. 
 L-3 Communications Mobile-Vision, Inc. 
 L-3
Communications Security And Detection Systems, Inc. 
 L-3 Communications Vector International Aviation LLC 

L-3 Communications Vertex Aerospace LLC 
 L-3 Communications
Westwood Corporation 
 L-3 Domestic Holdings, Inc. 
 L-3 Fuzing
And Ordnance Systems, Inc. 
 L-3 Unidyne, Inc. 
 L-3 Unmanned
Systems, Inc. 
 Pac Ord Inc. 
 Power Paragon, Inc. 

SPD Electrical Systems, Inc. 
 SPD Switchgear Inc. 

L-3 Afghanistan, LLC 
 L-3 Army Sustainment LLC 

L-3 Centaur, LLC 
 L-3 CTC Aviation Holdings Inc. 

L-3 CTC Aviation Leasing (US) Inc. 
 L-3 CTC Aviation Training
(US) Inc. 
 L-3 Investments, LLC 
  

			
	As Guaranteeing Subsidiaries
		
	 By:
	 	 /s/ Stephen M. Souza

		 	  

		 	 Name:  Stephen M. Souza

Title:    Vice President and Treasurer

  
 [Signature Page to Seventh
Supplemental Indenture] 

 
			
	L-3 Communications Integrated Systems L.P., a
Delaware limited partnership
		
	 By:
	 	 L-3 COMMUNICATIONS AIS GP CORPORATION,
  

as General Partner

		
	 By:
	 	 /s/ Stephen M. Souza

		 	  

		 	 Name:  Stephen M. Souza

Title:    Vice President and Treasurer

	
	Mustang Technology Group, L.P., a Texas limited partnership
		
	 By:
	 	 L-3 COMMUNICATIONS CORPORATION,
  

as General Partner

		
	 By:
	 	 /s/ Stephen M. Souza

		 	  

		 	 Name:  Stephen M. Souza

Title:    Vice President and Treasurer

  
 [Signature Page to Seventh
Supplemental Indenture] 

							
	Dated: October 31, 2016	 	 	 	 THE BANK OF NEW YORK MELLON TRUST

COMPANY, N.A.,
 as Trustee

				
		 		 	By:	 	/s/ Julie Hoffman-Ramos
		 		 		 	  

		 		 		 	 Name:  Julie Hoffman-Ramos

Title:    Vice President

  
 [Signature Page to Seventh
Supplemental Indenture]Exhibit

Exhibit 10.7

	
	
	MALLINCKRODT INTERNATIONAL FINANCE S.A.
675 McDonnell Boulevard
Hazelwood, MO 63042

September 30, 2016

Deutsche Bank AG New York Branch, as Administrative Agent
60 Wall Street
New York, NY 10005

Reference is made to that certain Credit Agreement, dated as of March 19, 2014 (as amended, supplemented, restated or otherwise modified from time to time, the “Credit Agreement”), by and among Mallinckrodt PLC, a public limited company incorporated in Ireland (“Parent”), Mallinckrodt International Finance S.A., a public limited liability company (société anonyme) incorporated under the laws of the Grand Duchy of Luxembourg (the “Lux Borrower”), Mallinckrodt CB LLC, a Delaware limited liability company (the “Co-Borrower”), the Lenders and Issuing Banks from time to time party thereto and Deutsche Bank AG New York Branch, as administrative agent (in such capacity, the “Administrative Agent”). All capitalized terms used herein (this “Agreement”) and not otherwise defined herein shall have the meanings ascribed thereto in the Credit Agreement.
The Lux Borrower hereby gives notice that, beginning with the Parent’s 2017 fiscal year, which will begin on December 31, 2016 and end on December 29, 2017 (the “2017 Fiscal Year”), the fiscal year of the Parent shall end on the last Friday in December of each calendar year.  Pursuant to Section 6.11 of the Credit Agreement, each of the Lux Borrower and the Administrative Agent hereby acknowledge and agree that, beginning with the 2017 Fiscal Year, for all purposes of the Credit Agreement and each other Loan Document, any reference in the Credit Agreement or any other Loan Document to the “fiscal year” of the Parent shall mean any period ending on the last Friday in December of the applicable calendar year and beginning on the day immediately following the last Friday in December of the preceding calendar year.  As a result of the foregoing:  (a) in satisfaction of the obligations of the Parent and the Borrowers under Sections 5.04(a) and 5.04(b) of the Credit Agreement with respect to (x) the period beginning on September 26, 2015 and ending on September 30, 2016 (the “Existing 2016 Fiscal Year”) and (y) the period beginning on October 1, 2016 and ending on December 30, 2016 (the “Transition Period”), the Parent and the Borrowers shall deliver (i) the financial statements and related information required by Section 5.04(a) of the Credit Agreement for the Existing 2016 Fiscal Year within 90 days after the end of the Existing 2016 Fiscal Year, (ii) the financial statements and related information required by Section 5.04(b) of the Credit Agreement (which financial statements and related information may, but are not required to, take the form of a transition report on Form 10-Q of the Parent and its consolidated Subsidiaries instead of the forms specified in Section 5.04(b) of the Credit Agreement) for the Transition Period within 45 days after the end of the Transition Period and (iii) concurrently with the delivery of financial statements under and in accordance with Section 5.04(a) of the Credit Agreement for the 2017 Fiscal Year, an opinion of independent public accountants of recognized national standing pertaining to financial statements for a period including the Transition Period and otherwise complying with the requirements of Section 5.04(a) of the Credit Agreement with respect to such an opinion; (b) the certificate of the applicable accounting firm required by Section 5.04(c)(y) of the Credit Agreement shall be delivered (i) with respect to the financial statements for the Existing 2016 Fiscal Year, concurrently with the financial statements described in clause (a)(i) hereof, (ii) with respect to the financial statements for the Transition Period, concurrently with the opinion described in clause (a)(iii) hereof and (iii) with respect to any subsequent fiscal year, in accordance with the requirements of such Section; (c) the Parent and the Borrowers shall deliver a Budget (i) for the 2017 Fiscal Year pursuant to Section 5.04(e) of the Credit Agreement within 90 days after the beginning of the 2017 Fiscal Year and shall not be required to deliver a Budget for the Transition Period or otherwise prior to such date under Section 5.04(e) of the Credit Agreement and (ii) for any subsequent fiscal year, in accordance with the requirements of Section 5.04(e) of the Credit Agreement; (d) the Parent and the Borrowers shall deliver an updated Perfection Certificate pursuant to Section 5.04(f) of the Credit Agreement (i) concurrently with the financial statements described in clause (a)(ii) hereof and shall not be required to do so with respect to the financial statements described in clause (a)(i) hereof and (ii) for any subsequent fiscal year, in accordance with the requirements of such Section; and (e) (i) the Excess Cash Flow Period that commenced on October 1, 2015 shall consist of both the Existing 2016 Fiscal Year and the Transition Period and shall end on December 30, 2016, (ii) the certificate and mandatory prepayment, if any, required by Section 2.11(c) of the Credit Agreement with respect to such Excess Cash Flow Period shall be delivered and/or paid (as applicable) no later than 5 Business Days following the date on which the financial statements described in clause (a)(ii) hereof are, or are required to be, delivered (and shall not be required to be delivered and/or paid (as applicable) at any time prior thereto), (iii) with respect to such Excess Cash Flow Period only, an Excess Cash Flow Interim Period may be a four-quarter period otherwise 

satisfying the definition thereof and (iv) each subsequent Excess Cash Flow Period shall consist of the corresponding fiscal year of the Parent. 
This Agreement shall not constitute an amendment or waiver of or consent to any provision of the Credit Agreement and the other Loan Documents except as expressly stated herein and shall not be construed as an amendment, waiver or consent to any action on the part of the Loan Parties that would require an amendment, waiver or consent of the Administrative Agent or the Lenders except as expressly stated herein.  Except as expressly waived hereby, the provisions of the Credit Agreement and the other Loan Documents are and shall remain in full force and effect in accordance with their terms. This Agreement shall constitute a “Loan Document” for all purposes of the Credit Agreement and the other Loan Documents.
This Agreement may be executed in any number of separate counterparts by the parties hereto (including by telecopy or via electronic mail), each of which counterparts when so executed shall be an original, but all the counterparts shall together constitute one and the same instrument.
THIS AGREEMENT AND ANY CLAIMS, CONTROVERSY, DISPUTE OR CAUSES OF ACTION (WHETHER IN CONTRACT OR TORT OR OTHERWISE) BASED UPON, ARISING OUT OF OR RELATING TO THIS AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.
On and after the date hereof, each reference in the Credit Agreement to “this Agreement,” “hereunder,” “hereof” or words of like import referring to the Credit Agreement, and each reference in the Notes and each of the other Loan Documents to “the Credit Agreement,” “thereunder,” “thereof” or words of like import referring to the Credit Agreement, shall mean and be a reference to the Credit Agreement, as amended by this Agreement.
IN WITNESS WHEREOF, as of the date first above written, each of the undersigned has executed this Letter Agreement. 

MALLINCKRODT INTERNATIONAL FINANCE S.A. 
        /s/ John Einwalter
By: ________________________
Name:  John Einwalter
Title:  Vice President & Treasurer

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