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SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Howley W Nicholas
(Last) (First) (Middle)
1301 EAST NINTH STREET
SUITE 3710
(Street)
CLEVELAND OH 44114
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
TransDigm Group INC [ TDG ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Chief Executive Officer
3. Date of Earliest Transaction (Month/Day/Year)
02/01/2008
4. If Amendment, Date of 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
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 02/01/2008 S 14 D $42.804 826 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.828 812 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.836 798 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.837 784 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 56 D $42.84 728 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 28 D $42.842 700 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.86 686 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 28 D $42.87 658 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.884 644 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.9 630 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 42 D $42.91 588 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.945 574 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 42 D $42.95 532 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.952 518 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.96 504 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.964 490 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.975 476 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $42.98 462 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 28 D $43 434 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.025 420 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.034 406 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.036 392 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.04 378 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.041 364 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.063 350 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 84 D $43.065 266 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.082 252 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.084 238 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 28 D $43.094 210 I Bratenahl Investments, Ltd.
Common Stock 02/01/2008 S 14 D $43.1 196 I Bratenahl Investments, Ltd.
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 Securities Underlying Derivative Security (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: 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
Explanation of Responses:
Remarks:
All transactions reported hereunder made pursuant to an established 10b5-1 plan.
Halle Fine Terrion as attorney-in-fact for W. Nicholas Howley 02/04/2008
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.