Document:

Second Supplemental Indenture (Senior Notes due 2038)

 Exhibit 10.4 
 This SECOND SUPPLEMENTAL INDENTURE, dated as of October 1, 2012 (this “Supplemental Indenture”), is among Bristow Group Inc., a Delaware corporation (the “Company”), each of the
parties identified under the caption “Existing Subsidiary Guarantors” on the signature pages hereto (the “Existing Subsidiary Guarantors”), the party identified under the caption “Additional Subsidiary Guarantor” on the
signature pages hereto (the “Additional Subsidiary Guarantor” and, together with the Existing Subsidiary Guarantors, the “Subsidiary Guarantors”) and U.S. Bank National Association, as Trustee (the “Trustee”).

 RECITALS 
 WHEREAS, the Company, the Existing Subsidiary Guarantors and the Trustee are party to that certain Indenture, dated as of June 17, 2008 (the “Base Indenture”) and that certain First
Supplemental Indenture dated as of June 17, 2008 (the “First Supplemental Indenture”; the Base Indenture, as modified and supplemented by the First Supplemental Indenture, the “Indenture”), pursuant to which the Company has
issued $115,000,000 principal amount of 3% Convertible Senior Notes due 2038 (the “Notes”); 
 WHEREAS,
Section 9.01(c) of the Indenture permits the Company, the Subsidiary Guarantors and the Trustee to amend or supplement the Indenture in order to add additional Subsidiary Guarantors without the consent of the Holders of the Notes; 

WHEREAS, all acts and things prescribed by the Indenture, by law and by the Certificate of Incorporation and the Bylaws (or comparable
constituent documents) of the Company, of the Subsidiary Guarantors and of the Trustee necessary to make this Supplemental Indenture a valid instrument legally binding on the Company, the Subsidiary Guarantors and the Trustee, in accordance with its
terms, have been duly done and performed; and 
 NOW, THEREFORE, to comply with the provisions of the Indenture and in
consideration of the above premises, the Company, the Subsidiary Guarantors and the Trustee covenant and agree for the equal and proportionate benefit of the respective Holders of the Notes as follows: 

ARTICLE 1 

Section 1.01. This Supplemental Indenture is supplemental to the Indenture and does and shall be deemed to form a part of, and shall
be construed in connection with and as part of, the Indenture for any and all purposes. 
 Section 1.02. This Supplemental
Indenture shall become effective immediately upon its execution and delivery by each of the Company, the Subsidiary Guarantors and the Trustee. 
 ARTICLE 2 
 From this date, by executing this Supplemental Indenture, each of the
Subsidiary Guarantors, including the Additional Subsidiary Guarantor, whose signatures appear below continue to be or hereby are, as applicable, subject to the provisions of the Indenture to the extent provided for in Article 10 thereunder.

 ARTICLE 3 
 Section 3.01. Except as specifically modified herein, the Indenture and the Notes are in all respects ratified and confirmed and shall remain in full force and effect in accordance with their terms
with all capitalized terms used herein without definition having the same respective meanings ascribed to them as in the Indenture. 
 Section 3.02. Except as otherwise expressly provided herein, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the Trustee by reason of this Supplemental
Indenture. This Supplemental Indenture is executed and accepted by the Trustee subject to all the terms and conditions set forth in the Indenture with the same force and effect as if those terms and conditions were repeated at length herein and
made applicable to the Trustee with respect hereto. 

 Section 3.03. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 
 Section 3.04. The parties may sign any number of counterparts of
this Supplemental Indenture. Each signed counterpart shall be an original, but all of such executed counterparts together shall represent the same agreement. Delivery of an executed signature page to this Supplemental Indenture by facsimile or
electronic transmission (i.e., .pdf or .tif) shall be as effective as delivery of a manually executed counterpart of this Supplemental Indenture. 
 [NEXT PAGE IS SIGNATURE PAGE] 

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

			
	BRISTOW GROUP INC.
		
	By:	 	/s/ Joseph A. Baj
		 	     Name: Joseph A. Baj
		 	     Title:   Vice President and Treasurer
	
	ADDITIONAL SUBSIDIARY GUARANTOR
	
	BHNA HOLDINGS INC.
		
	By:	 	/s/ Joseph A. Baj
		 	     Name: Joseph A. Baj
		 	     Title:   Vice President and Treasurer

  
 Signature Page
to Supplemental Indenture (3.00% Notes Indenture) 

 
			
	EXISTING SUBSIDIARY GUARANTORS
	
	 BRISTOW U.S. LLC,

f/k/a Air Logistics, L.L.C.

		
	By:	 	/s/ Joseph A. Baj
		 	     Name: Joseph A. Baj
		 	     Title:   Manager
	
	 BRISTOW ALASKA INC.,

f/k/a Air Logistics of Alaska, Incorporated

		
	By:	 	/s/ Joseph A. Baj
		 	     Name: Joseph A. Baj
		 	     Title:   Vice President and Treasurer
	
	 BRISTOW HELICOPTERS INC.,
 f/k/a Airlog International, Ltd.

		
	By:	 	/s/ Joseph A. Baj
		 	     Name: Joseph A. Baj
		 	     Title:   Vice President and Treasurer

  
 Signature Page
to Supplemental Indenture (3.00% Notes Indenture) 

 
			
	 U.S. BANK NATIONAL ASSOCIATION,
 as Trustee

		
	By:	 	/s/ Susan C. Chadbourne
		 	     Name: Susan C. Chadbourne
		 	     Title:   Vice President

  
 Signature Page
to Supplemental Indenture (3.00% Notes Indenture)First Supplemental Indenture

 Exhibit 4.1 
 [EXECUTION VERSION] 
 FIRST SUPPLEMENTAL INDENTURE (this “Supplemental
Indenture”), dated as of October 1, 2012, by and among DJO Finance LLC, a Delaware limited liability company (“DJO LLC”), DJO Finance Corporation, a Delaware corporation (“DJO Corp.” and, together with
DJO LLC, the “Issuers”), the Guarantors party hereto (the “Guarantors”), and The Bank of New York Mellon, a New York banking corporation, as trustee (the “Trustee”). 

W I T N E S S E T H 
 WHEREAS, each of DJO LLC, DJO Corp. and the Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the Trustee an indenture (the “Indenture”),
dated as of March 20, 2012, providing for the issuance of an unlimited aggregate principal amount of 8.75% Second Priority Senior Secured Notes due 2018 (the “Existing Notes”); 

WHEREAS, Section 2.01 of the Indenture provides that additional notes ranking pari passu with the Initial Notes may be
created and issued from time to time by the Issuers without notice to or consent of the Holders and shall be consolidated with and form a single class with the Initial Notes and shall have the same terms as to status, redemption or otherwise as the
Initial Notes; and 
 WHEREAS, the Issuers and the Guarantors desire to execute and deliver this Supplemental Indenture for the
purpose of issuing $100,000,000 in aggregate principal amount of additional notes, having terms substantially identical in all material respects to the Existing Notes (the “Additional Notes” and, together with the Existing Notes,
the “Notes”), except that the Additional Notes represented by a Regulation S Global Note will be issued initially under CUSIP and ISIN numbers different from the Existing Notes as set forth on Schedule I hereto; 

WHEREAS, the Indenture contains provisions that do not conform to the text of the “Description of Notes” section of the
Offering Circular and such provisions were intended to be a verbatim recitation of such section; 
 WHEREAS,
Section 9.01(15) provides that the Issuers and the Trustee may amend or supplement the Indenture to conform the text of the Indenture to any provision of the “Description of Notes” section of the Offering Circular to the extent that
such provision in such “Description of Notes” section was intended to be a verbatim recitation of a provision of the Indenture; and 
 WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this 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) Additional Securities. As of the date hereof, the Issuers will issue, and the Trustee is directed
to authenticate and deliver, the Additional Notes under the Indenture, having terms substantially identical in all material respects to the Existing Notes, at an issue price of 106.75% plus accrued interest from September 15, 2012. The Existing
Notes and the Additional Notes shall be treated as a single class for all purposes under the Indenture. 

 (3) Amendments to Certain Provisions of the Indenture. Pursuant to
Section 9.01(15) of the Indenture, the following modifications are made to the Indenture: 
 The last
sentence of the first paragraph of Section 3.03 of the Indenture shall be deleted and replaced with the following: 

“Any notice of redemption may be subject to one or more conditions precedent, including, but not limited to, the completion of an
Equity Offering or other corporate transaction.” 
 Section 4.09(b)(12) is deleted and replace in its entirety by the
following: 
 “(12) (A) Indebtedness or Disqualified Stock of the Company and Indebtedness, Disqualified Stock or Preferred
Stock of the Company or any Restricted Subsidiary equal to 200.0% of the net cash proceeds received by the Company since immediately after the Issue Date from the issue or sale of Equity Interests of the Company or cash contributed to the capital of
the Company (in each case, other than proceeds of Disqualified Stock or sales of Equity Interests to the Company or any of its Subsidiaries) as determined in accordance with clauses (3)(b) and (3)(c) of Section 4.07(a) hereof to the
extent such net cash proceeds or cash have not been applied to make Restricted Payments or to make other Investments, payments or exchanges pursuant to such clauses or pursuant to Section 4.07(b) hereof or to make Permitted Investments (other
than Permitted Investments specified in clauses (1), (2) and (3) of the definition thereof) and (B) Indebtedness or Disqualified Stock of the Company and Indebtedness, Disqualified Stock or Preferred Stock of the Company or any
Restricted Subsidiary not otherwise permitted hereunder in an aggregate principal amount or liquidation preference, which when aggregated with the principal amount and liquidation preference of all other Indebtedness, Disqualified Stock and
Preferred Stock then outstanding and incurred pursuant to this Section 4.09(b)(12)(B), does not at any one time outstanding exceed $175.0 million (it being understood that any Indebtedness, Disqualified Stock or Preferred Stock incurred
pursuant to this Section 4.09(b)(12)(B) shall cease to be deemed incurred or outstanding for purposes of this Section 4.09(b)(12)(B) but shall be deemed incurred for the purposes of Section 4.09(a) hereof from and after the first date
on which the Company or such Restricted Subsidiary could have incurred such Indebtedness, Disqualified Stock or Preferred Stock under Section 4.09(a) hereof without reliance on this Section 4.09(b)(12)(B));” 

The following shall be added to the end of Section 4.09: 
 “This Indenture shall not treat (1) unsecured Indebtedness as subordinated or junior to Secured Indebtedness merely because it is unsecured or (2) Senior Indebtedness as subordinated or
junior to any other Senior Indebtedness merely because it has a junior priority with respect to the same collateral.” 
 (4) Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 

(5) Counterparts. 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. 

  
 2 

 (6) Effect of Headings. The Section headings herein are for
convenience only and shall not affect the construction hereof. 
 (7) 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 Issuers and the Guarantors.

 (8) Continued Effect. Except as expressly supplemented and amended by this Supplemental Indenture, the
Indenture shall continue in full force and effect in accordance with the provisions thereof, and the Indenture (as supplemented and amended by this Supplemental Indenture) is in all respects hereby ratified and confirmed. This Supplemental Indenture
and all the terms and conditions of this Supplemental Indenture, with respect to the Notes, shall be and be deemed to be part of the terms and conditions of the Indenture for any and all purposes. 

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

  
 3 

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

			
	DJO FINANCE LLC
		
	By:	 	/s/ Vickie L. Capps
		 	Name: Vickie L. Capps
		 	Title: Executive Vice President and Chief Financial Officer
	
	DJO FINANCE CORPORATION
		
	By:	 	    /s/ Vickie L. Capps
		 	Name: Vickie L. Capps
		 	Title: Executive Vice President and Chief Financial Officer
	
	ENCORE MEDICAL PARTNERS, LLC
	ENCORE MEDICAL GP, LLC
	EMPI, INC.
	ENCORE MEDICAL ASSET CORPORATION
	DJO, LLC
	ELASTIC THERAPY, LLC
	RIKCO INTERNATIONAL, LLC
		
	By:	 	    /s/ Vickie L. Capps
		 	Name: Vickie L. Capps
		 	Title: Executive Vice President and Chief Financial Officer

  
 Signature Page
to Supplemental Indenture 

 
			
	ENCORE MEDICAL, L.P.
	By: ENCORE MEDICAL GP, LLC, its general partner
		
	By:	 	    /s/ Vickie L. Capps
		 	Name: Vickie L. Capps
		 	Title: Executive Vice President and Chief Financial Officer

  
 Signature Page
to Supplemental Indenture 

 
			
	THE BANK OF NEW YORK MELLON, as Trustee
		
	        by	 	
	 	 	        /s/ Laurence J. O’Brien
		 	Name:   Laurence J. O’Brien
		 	Title:     Vice President

  
 Signature Page
to Supplemental Indenture 

 Schedule I 
 Additional Notes 
 CUSIP/ISIN Numbers 

Reg S Notes 
 Temporary CUSIP Number:
U2540N AF6 
 Temporary ISIN Number: USU2540NAF60

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