TransDigm Group INC — Director's Dealing 2011

May 24, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TransDigm Group INC (TDG)
CIK: 0001260221
Period of Report: 2011-05-23

Reporting Person: Iversen Bernt G II (Executive Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-23	Common Stock	M	12500	$22.21	Acquired	12500	Direct
2011-05-23	Common Stock	S	11900	$80.411	Disposed	600	Direct
2011-05-23	Common Stock	S	600	$81.0673	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-23	Stock Option	$22.21	M	12500	Disposed	2016-06-15	Common Stock (12500)	Direct

Footnotes

F1: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $80.02 - $81.00. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.

F2: Price reported constitutes the average weighted price of shares sold. Shares were sold at varying prices in the range of $81.03 - $81.14. The reporting person hereby undertakes, upon request of the Commission, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price.