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Exhibit 22.1

LISTING OF SUBSIDIARY GUARANTORS

The following series of senior subordinated and secured notes issued by TransDigm Inc., a wholly owned subsidiary of TransDigm Group Incorporated, are unconditionally guaranteed, on a joint and several basis, by TransDigm Group Incorporated and each of the subsidiaries listed below under “Subsidiary Guarantors.”

			Description
			6.750% senior secured notes due 2028 (“2028 Secured Notes”)
			4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”)
			6.375% senior secured notes due 2029 (“2029 Secured Notes”)
			4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”)
			6.875% senior secured notes due 2030 (“2030 Secured Notes”)
			7.125% senior secured notes due 2031 (“2031 Secured Notes”)
			6.625% senior secured notes due 2032 (“2032 Secured Notes”)
			6.000% senior secured notes due 2033 (“2033 Secured Notes”)
			6.375% senior subordinated notes due 2033 (“6.375% 2033 Notes”)
			6.250% senior secured notes due 2034 (“2034 Secured Notes”)
			6.750% senior subordinated notes due 2034 (“6.750% 2034 Notes”)

			Subsidiary Guarantors						Jurisdiction of Incorporation or Organization
			4455 Genesee Properties, LLC						Delaware
			4455 Genesee Street, LLC						Delaware
			17111 Waterview Pkwy LLC						Delaware
			Acme Aerospace, Inc.						Delaware
			Adams Rite Aerospace, Inc.						California
			AeroControlex Group, Inc.						Delaware
			Aerosonic LLC						Delaware
			Airborne Acquisition, Inc.						Delaware
			Airborne Global, Inc.						Delaware
			Airborne Holdings, Inc.						Delaware
			Airborne Systems NA Inc.						Delaware
			Airborne Systems North America Inc.						Delaware
			Airborne Systems North America of CA Inc.						Delaware
			Airborne Systems North America of NJ Inc.						New Jersey
			AmSafe Global Holdings, Inc.						Delaware
			AmSafe, Inc.						Delaware
			Angus Electronics Co.						Delaware
			Apical Industries, Inc.						California
			Arkwin Industries, Inc.						New York
			Armtec Countermeasures Co.						Delaware
			Armtec Countermeasures TNO Co.						Delaware
			Armtec Defense Products Co.						Delaware
			Ashford Properties, LLC						Delaware
			Auxitrol Weston USA, Inc.						Delaware
			Aviation Technologies, Inc.						Delaware
			Avionic Instruments LLC						Delaware
			Avionics Specialties, Inc.						Virginia
			AvtechTyee, Inc.						Washington

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			Subsidiary Guarantors						Jurisdiction of Incorporation or Organization
			Beta Transformer Technology LLC						Delaware
			Breeze-Eastern LLC						Delaware
			Bridport Erie Aviation, Inc.						Delaware
			Bridport Holdings, Inc.						Delaware
			Bridport-Air Carrier, Inc.						Washington
			Bruce Aerospace Inc.						Delaware
			Calspan Air Facilities, LLC						New York
			Calspan Air Services, LLC						New York
			Calspan ASE Portugal, Inc.						Minnesota
			Calspan Holdings, LLC						New York
			CALSPAN JETS LLC						Delaware
			Calspan Technology Acquisition LLC						Delaware
			Calspan, LLC						New York
			CDA InterCorp LLC						Florida
			CEF Industries, LLC						Delaware
			Champion Aerospace LLC						Delaware
			Chelton Avionics Holdings, Inc.						Delaware
			Chelton Avionics, Inc.						Delaware
			Chelton Defense Products, Inc.						Delaware
			CMC Electronics Aurora LLC						Delaware
			CPI EDB Intermediate Holdings, Inc.						Delaware
			CPI Electron Device Business, Inc.						Delaware
			CTHC LLC						New York
			Dart Aerospace USA, Inc.						Washington
			Dart Buyer, Inc.						Delaware
			Dart Helicopter Services, Inc.						Delaware
			Dart Intermediate, Inc.						Delaware
			Dart TopCo, Inc.						Delaware
			Data Device Corporation						Delaware
			Dukes Aerospace, Inc.						Delaware
			Electromech Technologies LLC						Delaware
			Esterline Europe Company LLC						Delaware
			Esterline International Company						Delaware
			Esterline Technologies Corporation						Delaware
			Esterline Technologies SGIP LLC						Delaware
			FPT Industries LLC						Delaware
			Genesee Holdings II, LLC						New York
			Genesee Holdings III, LLC						New York
			Genesee Holdings, LLC						New York
			HarcoSemco LLC						Connecticut
			Hartwell Corporation						California
			Heli Tech, Inc.						Oregon
			Hytek Finishes Co.						Delaware
			Iceman Holdco, Inc.						Delaware

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			Subsidiary Guarantors						Jurisdiction of Incorporation or Organization
			ILC Holdings, Inc.						Delaware
			Janco Corporation						California
			Johnson Liverpool LLC						Delaware
			King Nutronics, LLC						Delaware
			Kirkhill Inc.						Delaware
			Korry Electronics Co.						Delaware
			Leach Holding Corporation						Delaware
			Leach International Corporation						Delaware
			Leach Mexico Holding LLC						Delaware
			Leach Technology Group, Inc.						Delaware
			MarathonNorco Aerospace, Inc.						Delaware
			Mason Electric Co.						Delaware
			McKechnie Aerospace DE, Inc.						Delaware
			McKechnie Aerospace US LLC						Delaware
			Medtherm Labs, LLC						Delaware
			Microwave Power Products, Inc.						Delaware
			NAT Seattle Inc.						Delaware
			NMC Group, Inc.						California
			Nordisk Aviation Products LLC						Delaware
			North Hills Signal Processing Corp.						Delaware
			North Hills Signal Processing Overseas LLC						Delaware
			Norwich Aero Products Inc.						New York
			Offshore Helicopter Support Services, Inc.						Louisiana
			Oppenheimer Precision Products, Inc.						Pennsylvania
			Palomar Products, Inc.						Delaware
			Paravion Technology, Inc.						Colorado
			Pexco Aerospace, Inc.						Delaware
			PneuDraulics, Inc.						California
			Power Device Corporation						New York
			Raptor Labs HoldCo, LLC						Delaware
			Raptor Labs Intermediate, LLC						Delaware
			Schneller LLC						Delaware
			Semco Instruments, Inc.						Delaware
			Sensor Concepts, LLC						Delaware
			Servotronics, Inc.						Delaware
			Shield Restraint Systems, Inc.						Delaware
			Simplex Manufacturing Co.						Oregon
			Skandia, Inc.						Illinois
			Skurka Aerospace Inc.						Delaware
			Space Electronics LLC						Delaware
			Symetrics Industries, LLC						Florida
			TA Aerospace Co.						California
			Tactair Fluid Controls, Inc.						New York
			TDG ESL Holdings Inc.						Delaware

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			Subsidiary Guarantors						Jurisdiction of Incorporation or Organization
			TEAC Aerospace Technologies, Inc.						Delaware
			Telair US LLC						Delaware
			TestVonics, Inc.						New Hampshire
			Texas Rotronics, Inc.						Texas
			TransDigm UK Holdings Limited						United Kingdom
			Transicoil LLC						Delaware
			Whippany Actuation Systems, LLC						Delaware
			Young & Franklin Inc.						New York