Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SMALL ROBERT J
  2. Issuer Name and Ticker or Trading Symbol
TransDigm Group INC [TDG]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O BERKSHIRE PARTNERS LLC, 200 CLARENDON STREET, 35TH FLOOR
3. Date of Earliest Transaction (Month/Day/Year)
03/07/2014
(Street)

BOSTON,, MA 02116
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 03/07/2014   J   1,032,008 (1) D $ 0 2,941,086 I By Berkshire Entities (2) (3)
Common Stock               168,163 I By Stockbridge Partners LLC (4)
Common Stock 03/07/2014   J   3,100 (5) A $ 0 4,506 I By Family Trusts (6)
Common Stock 03/07/2014   J   17,667 (5) A $ 0 41,162 (7) D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SMALL ROBERT J
C/O BERKSHIRE PARTNERS LLC
200 CLARENDON STREET, 35TH FLOOR
BOSTON,, MA 02116
  X      

Signatures

 /s/ Robert J. Small   03/10/2014
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents a pro-rata distribution by certain of the Berkshire Entities (as defined below). This Form 4 has been filed because the Reporting Person is a director of the Issuer and a managing member of, or managing member of the general partner of, each of the Berkshire Entities. As such, the Reporting Person may be deemed to have shared voting and/or dispositive power over the shares held by the Berkshire Entities. However, the Reporting Person disclaims beneficial ownership of such shares, except to the extent of his pecuniary interest therein.
(2) Owned by Berkshire Fund VII, L.P. ("VII"), Berkshire Fund VII-A, L.P. ("VII-A"), Berkshire Investors LLC ("Investors"), Berkshire Investors III LLC ("Investors III"), Stockbridge Fund, L.P. ("SF"), Stockbridge Fund M, L.P. ("SFM"), Stockbridge Absolute Return Fund, L.P. ("SARF") and Stockbridge Master Fund (OS), L.P. ("SOS") (collectively, the "Berkshire Entities"). BPSP, L.P. ("BPSP") is the managing member of Berkshire Partners LLC, the registered investment adviser to VII, VII-A, Investors and Investors III ("BP"). Seventh Berkshire Associates LLC ("7BA") is the general partner of each of VII and VII-A. Stockbridge Associates LLC ("SA") is the general partner of SF, SFM, SARF and SOS.
(3) The Reporting Person is a managing member of each of BPSP, BP, 7BA, SA, Investors and Investors III. As such, the Reporting Person may be deemed to have shared voting and/or dispositive power over the shares held by such entities. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent of his pecuniary interest therein.
(4) Represents shares held by Stockbridge Partners LLC on behalf of a managed account over which it has shared voting and sole dispositive power. This Form 4 has been filed because the Reporting Person is a director of the Issuer and a managing member of Stockbridge Partners LLC. As such, the Reporting Person may be deemed to have shared voting and/or dispositive power over the shares held by Stockbridge Partners LLC. However, the Reporting Person disclaims beneficial ownership of these shares, except to the extent of his pecuniary interest, if any, therein.
(5) Represents shares received as part of the distribution by the Berkshire Entities referred to in note (1) above.
(6) Includes (i) 3,100 shares of Common Stock received by certain family trusts as part of the distribution by the Berkshire Entities referred to in note (1) above, and (ii) 1,406 shares of Common Stock beneficially owned by such family trusts. The Reporting Person is a trustee and the Reporting Person's immediate family members are beneficiaries of such family trusts.
(7) Includes (i) 17,667 shares of Common Stock received by the Reporting Person as part of the distribution by the Berkshire Entities referred to in note (1) above, and (ii) 23,495 shares of Common Stock beneficially owned by the Reporting Person.

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