Document:

Exhibit 10.1

Wachovia Bank,
N.A.

Real Estate Financial Services Group

WS 5200

One Boston Place

201 Washington Street, 27th Floor

Boston, MA 02108

Tel 617-603-4226

Fax 617-603-4228

August 10, 2007

Boston Capital Real
Estate Investment Trust, Inc.

C/O Boston Capital

One Boston Place

Boston, Massachusetts  02108

Re:  Credit Agreement, dated as of December 6,
2006, among Boston Capital Real Estate Investment Trust, Inc., as the Borrower
(the “Borrower”), Wachovia Bank, National Association, as Administrative
Agent and L/C Issuer, Wachovia Capital Markets, LLC, as Sole Lead Arranger and
Sole Book Manager and the other Lenders party thereto (the “Credit Agreement”)

Reference is made to the
Credit Agreement described above.  All
capitalized terms used herein and not defined shall have the respective
meanings provided such terms in the Credit Agreement.  This letter agreement (the “Agreement”)
confirms the agreement of the Lenders and the Borrowers to amend and waive the
Credit Agreement in accordance with Section 10.01 of the Credit Agreement as
follows:

1.             Section 2.01(a) of the Credit Agreement is hereby
amended by deleting the following phrase: 
“provided, however, that notwithstanding any provision in the
Agreement or any other Loan Document to the contrary, there shall be no
additional Availability hereunder and the Lenders shall have no obligation to
make any other or further Credit Extensions hereunder until such time as the
Borrower shall have first repaid in full the entire amount of the Initial
Borrowing.”

2.             The Lenders hereby agree to waive the requirement set
forth in Section 2.01(b) of the Credit Agreement that requires as a condition
precedent to Subsequent Borrowing that the entire amount of the Committed Loan
under the Initial Borrowing shall have first been repaid in full to the
satisfaction of the Administrative Agent.

3.             Section 2.14 of the Credit Agreement is hereby amended
by deleting Section 2.14(b)(vii).

4.             The Lenders hereby agree that notwithstanding Sections
2.07(d)(i) and 2.07(d)(iii) of the Credit Agreement, the Borrower shall have
the right to request an extension of the Initial Maturity Date even if the
Borrower does not extend the July1, 2007 Termination Date beyond the Initial
Termination Date.  The Administrative
Agent hereby waives and discharges its rights under the Credit Agreement,
including pursuant to Section 2.07(d) of the Credit Agreement, to receive prior
written notice of Borrower’s inability to extend such Termination Date.

5.             This Agreement is limited as specified and shall not
constitute a modification, acceptance or waiver of any other provision of the
Credit Agreement.

6.             From and after the date hereof, all references in the
Credit Agreement to the Credit Agreement shall be deemed to be references to
the Credit Agreement as modified hereby.

7.             This Agreement may be executed in counterparts,
including counterparts transmitted by facsimile.

[Signature Page
Follows]

 

IN WITNESS
WHEREOF, the Lenders hereby execute this Agreement as of the date set forth
above.

	
  

  	
   

  	
  BORROWER:

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
  BOSTON CAPITAL REAL ESTATE

  
	
   

  	
   

  	
  INVESTMENT TRUST, INC., a Maryland corporation

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  /s/ Marc N. Teal

  
	
   

  	
   

  	
   

  	
  Name: Marc N. Teal

  
	
   

  	
   

  	
   

  	
  Title: Sr. Vice President

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  WACHOVIA BANK, NATIONAL

  
	
   

  	
   

  	
  ASSOCIATION, as a lender and L/C Issuer

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By: 

  	
  /s/ Filomena R. Cerqueira

  
	
   

  	
   

  	
   

  	
  Name: Filomena R. Cerqueira

  
	
   

  	
   

  	
   

  	
  Title: Vice President

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  AGREED AND
  ACKNOWLEDGED

  	
   

  	
   

  	
   

  
	
  As of the date
  set forth above.

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  Wachovia Bank,
  National Association,

  	
   

  	
   

  	
   

  
	
  As Administrative
  Agent

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  By: 

  	
  /s/ Filomena R.
  Cerqueira

  	
   

  	
   

  	
   

  
	
   

  	
  Name: Filomena
  R. Cerqueira

  	
   

  	
   

  	
   

  
	
   

  	
  Title: Vice
  PresidentEXHIBIT 10.1

TRANSDIGM
INC.,

TRANSDIGM GROUP INCORPORATED,

THE
GUARANTORS named herein

and

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

FOURTH
SUPPLEMENTAL INDENTURE

Dated
as of August 10, 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

7-3/4%
Senior Subordinated Notes due 2014

of TransDigm Inc.

 

	
  FOURTH SUPPLEMENTAL
  INDENTURE

  

 

FOURTH SUPPLEMENTAL
INDENTURE (this “SUPPLEMENTAL INDENTURE”), dated as of August 10, 2007,
among Bruce Aerospace, Inc., a Delaware corporation (“BRUCE AEROSPACE”), Bruce
Industries, Inc., a Colorado corporation (“BRUCE INDUSTRIES” and, together with
Bruce Aerospace, 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 and successor to
Champion Aerospace Inc. (“CHAMPION”), Avionic Instruments LLC, a Delaware
limited liability company and successor to Avionic Instruments Inc. (“AVIONIC”),
Skurka Aerospace Inc., a Delaware corporation (“SKURKA”), CDA InterCorp LLC, a
Florida limited liability company and successor to CDA Intercorp (“CDA”),
Aviation Technologies, Inc., a Delaware corporation (“ATI”), Avtech Corporation,
a Washington corporation (“AVTECH”), Transicoil LLC, a Delaware limited
liability company and successor to Transicoil Corp. (“TRANSICOIL”),
AeroControlex Group, Inc., a Delaware corporation (“AEROCONTROLEX”),  Malaysian Aerospace Services, Inc., a Delaware
corporation (“MALAYSIAN” and, together with TD Group, Adams Rite, Marathon,
Champion, Avionic, Skurka, CDA, ATI, Avtech, Transicoil and AeroControlex, 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, the Second Supplemental Indenture, dated as of
February 7, 2007 and the Third Supplemental Indenture, dated June 29, 2007, the
“INDENTURE”), dated as of June 23, 2006, providing for the issuance by the
Company of 7-3/4% 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”);

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;
and

WHEREAS, in June 2007,
the following intercompany mergers were effected: (i) West Coast Specialties,
Inc. was merged with and into Avtech with Avtech continuing as the surviving
corporation; (ii) Christie Electric Corp. was merged with and into Marathon
with Marathon continuing as the surviving corporation; (iii) ZMP, Inc. was
merged with and into Adams Rite with Adams Rite continuing as the surviving
corporation; (iv) DAC Realty Corp. 

was merged with and into
Avionic with Avionic continuing as the surviving entity; and (v) Sweeney
Engineering Corp. was merged with and into the Company with the Company
continuing as the surviving corporation.

NOW THEREFORE, in
consideration of the foregoing and for other good and valuable consideration,
the receipt of which is hereby acknowledged, the Guaranteeing Subsidiaries
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.  GUARANTEE, ETC.  The Guaranteeing Subsidiaries hereby agree
that from and after the date hereof each 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 Subsidiaries agree that the
Guarantee granted by each of them 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.

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

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

	
  

  	
  TRANSDIGM INC.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Executive Vice
  President and

  
	
   

  	
   

  	
  Chief Financial
  Officer

  
	
   

  	
   

  
	
   

  	
  TRANSDIGM GROUP
  INCORPORATED

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Executive Vice
  President, Chief

  
	
   

  	
   

  	
  Financial Officer
  and Secretary

  
	
   

  	
   

  
	
   

  	
  CHAMPION
  AEROSPACE LLC

  
	
   

  	
   

  
	
   

  	
  By:  TransDigm Inc., its sole member

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Executive Vice
  President and

  
	
   

  	
   

  	
  Chief Financial
  Officer

  
	
   

  	
   

  
	
   

  	
  ADAMS RITE
  AEROSPACE, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and
  Assistant Secretary

  
	
   

  	
   

  	
   

  
	
   

  	
  MARATHONNORCO
  AEROSPACE, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and
  Assistant Secretary

  
									

 

 

	
  

  	
  AVIONIC INSTRUMENTS LLC

  	
   

  
	
   

  	
   

  
	
   

  	
  By:  TransDigm Inc., its sole member

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Executive Vice
  President and

  
	
   

  	
   

  	
  Chief Financial
  Officer

  
	
   

  	
   

  
	
   

  	
  SKURKA AEROSPACE
  INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and
  Assistant Secretary

  
	
   

  	
   

  	
   

  
	
   

  	
  CDA INTERCORP
  LLC

  
	
   

  	
   

  
	
   

  	
  By:  TransDigm Inc., its sole member

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Executive Vice President
  and

  
	
   

  	
   

  	
  Chief Financial
  Officer

  
	
   

  	
   

  
	
   

  	
  AVIATION
  TECHNOLOGIES, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and
  Secretary

  
	
   

  	
   

  	
   

  
	
   

  	
  AVTECH
  CORPORATION

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and
  Secretary

  
										

 

Fourth Supplemental Indenture

 

	
  

  	
  TRANSICOIL LLC

  	
   

  
	
   

  	
   

  
	
   

  	
  By:  TransDigm Inc., its sole member

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Executive Vice
  President and

  
	
   

  	
   

  	
  Chief Financial
  Officer

  
	
   

  	
   

  
	
   

  	
  AEROCONTROLEX
  GROUP, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer
  and  Secretary

  
	
   

  	
   

  	
   

  
	
   

  	
  MALAYSIAN
  AEROSPACE SERVICES, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and
  Secretary

  
	
   

  	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  BRUCE AEROSPACE,
  INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and Secretary

  
	
   

  	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  BRUCE
  INDUSTRIES, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  

  	
  By:

  	
   /s/ GREGORY
  RUFUS

  	
   

  
	
   

  	
  Name: 

  	
  Gregory Rufus

  
	
   

  	
  Title:

  	
  Treasurer and
  Secretary

  
						

 

 

	
  

  	
  THE BANK OF NEW YORK TRUST

  COMPANY, N.A., as Trustee

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ ROXANE J. ELLWANGER

  	
   

  
	
   

  	
   

  	
  Name: 

  	
  Roxane J.
  Ellwanger

  
	
   

  	
   

  	
  Title:

  	
  Asst. Vice
  President

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