Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  Skulina James
 2. Date of Event Requiring Statement (Month/Day/Year)
01/01/2012		 3. Issuer Name and Ticker or Trading Symbol
TransDigm Group INC [TDG]
(Last)
(First)
(Middle)
1301 EAST NINTH STREET, SUITE 3000		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive Vice President
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CLEVELAND, OH 44114		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option 07/22/2003 07/19/2012 Common Stock 71,458 $ 3.35 D  
Stock Option 08/05/2003 08/05/2013 Common Stock 59,840 $ 6.68 D  
Stock Option 09/30/2006 08/05/2013 Common Stock 239 $ 13.37 D  
Stock Option 09/28/2005 07/19/2012 Common Stock 4,966 $ 13.37 D  
Stock Option 10/01/2005 10/01/2015 Common Stock 11,968 $ 13.37 D  
Stock Option 08/05/2003 08/05/2013 Common Stock 14,960 $ 6.68 D  
Stock Option 09/30/2006 08/05/2013 Common Stock 60 $ 13.37 D  
Stock Option 09/28/2005 07/19/2012 Common Stock 1,242 $ 13.37 D  
Stock Option 10/01/2005 10/01/2015 Common Stock 2,992 $ 13.37 D  
Stock Option 09/30/2009 11/17/2018 Common Stock 35,000 $ 27.08 D  
Stock Option 09/30/2010 11/16/2019 Common Stock 10,000 $ 41.79 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Skulina James
1301 EAST NINTH STREET
SUITE 3000
CLEVELAND, OH 44114		       Executive Vice President  

Signatures

/s/Halle Fine Terrion, as Attorney-in-Fact for James Skulina 01/06/2012
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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