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 *
  Valladares Jorge
 2. Date of Event Requiring Statement (Month/Day/Year)
04/25/2008		 3. Issuer Name and Ticker or Trading Symbol
TransDigm Group INC [TDG]
(Last)
(First)
(Middle)
5000 TRIGGS ST		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Pres., Adel Wiggins Group
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

LOS ANGELES, CA 90022		 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)
Common Stock 2,000
D
 

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 09/30/2004(1) 03/01/2014 Common Stock 19,119 $ 6.68 D  
Stock Option 03/01/2005(2) 03/01/2014 Common Stock 2,992 $ 6.68 D  
Stock Option 09/30/2006(3) 06/15/2016 Common Stock 19,000 $ 22.21 D  
Stock Option 06/15/2006(4) 06/15/2016 Common Stock 5,000 $ 22.21 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Valladares Jorge
5000 TRIGGS ST
LOS ANGELES, CA 90022		       Pres., Adel Wiggins Group  

Signatures

Halle Fine Terrion as attorney in fact for Jorge Valladeres 05/05/2008
**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).
(1) Options for 10,364 shares are immediately exerciseable. Options for remaining shares vest 9/30/2008.
(2) Fully vested
(3) Options for 12,678 shares vested. Options for remaining shares vest 9/30/2008
(4) Options to purchase 3,333 shares vested. Options to purchase remaining shares vest June 15, 2008.

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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