EXHIBIT 99.3

JOINT FILERS’ SIGNATURES

Designated Filer:  TD Group Holdings, LLC

Issuer & Ticker Symbol:  TransDigm Group
Incorporated [TDG]

Date of Event Requiring Statement:  March 23, 2009

TD GROUP HOLDINGS, LLC

By: Warburg Pincus Private Equity VIII, L.P., its Managing Member

By:  Warburg Pincus Partners, LLC, its General Partner

By:  Warburg Pincus & Co., its Managing Member

By:			/s/ Scott A. Arenare						Dated:	3/24/09
			Name:					Scott A. Arenare
			Title:					Partner
WARBURG PINCUS PRIVATE EQUITY VIII, L.P.
By: Warburg Pincus Partners, LLC, its General Partner
By: Warburg Pincus & Co., its Managing Member
By:	/s/ Scott A. Arenare								Dated:	3/24/09
		Name:					Scott A. Arenare
		Title:					Partner
WARBURG PINCUS & CO.
By:		/s/ Scott A. Arenare							Dated:	3/24/09
		Name:				Scott A. Arenare
		Title:				Partner
WARBURG PINCUS LLC
By:		/s/ Scott A. Arenare							Dated:	3/24/09
		Name:			Scott A. Arenare
		Title:			Managing Director
WARBURG PINCUS PARTNERS, LLC
By: Warburg Pincus & Co., its Managing Member
By:	/s/ Scott A. Arenare								Dated:	3/24/09
	Name:			Scott A. Arenare
	Title:			Partner