Exhibit 21.1

Subsidiaries of Triumph Group, Inc.

Triumph Brands, Inc.

Triumph Group Charitable Foundation

Triumph Group Acquisition Corp.

Triumph Group Acquisition Holdings, Inc.

Triumph Controls - Germany GmbH

Triumph Processing, Inc.

Triumph Actuation Systems -Connecticut, LLC

Triumph Aerospace Systems Group, LLC

Triumph Precision Castings Co.

Triumph Fabrications - Fort Worth, Inc.

Triumph Actuation Systems, LLC

Triumph Controls, LLC

Triumph Instruments, Inc.

Triumph Structures - Los Angeles, Inc.

Triumph Engineered Solutions, Inc.

Triumph Structures -Kansas City, Inc.

Nu-Tech Brands, Inc.

CBA Acquisition, LLC

Triumph Controls (Europe) SAS

Constructions Brevetees d'Alfortville (SAS)

Triumph Fabrications - San Diego, Inc.

Triumph Aerospace Systems - Wichita, Inc.

Triumph Gear Systems -Macomb, Inc.

Triumph Airborne Structures, LLC

Triumph Fabrications - Hot Springs, LLC

Triumph Turbine Services, Inc.

Triumph Engineering Services, Inc.

Triumph Aviations Inc.

Triumph Actuation Systems -Valencia, Inc.

The Triumph Group Operations, Inc.

Triumph Gear Systems, Inc.

Triumph Thermal Systems, LLC

Triumph Composite Systems, Inc.

Triumph Aftermarket Services Group, LLC

HT Parts, L.L.C.

Triumph Metals Company

Triumph Aviation Services Asia, Ltd.

Triumph Structures -Wichita, Inc.

Triumph Interiors, LLC

Triumph Aerospace Systems -Newport News, Inc.

Triumph Accessory Services - Grand Prairie, Inc.

Triumph Structures - East Texas, Inc.

Triumph Precision, Inc.

Triumph Insulation Systems, LLC

Triumph Insulation Systems - Germany GmbH

The Mexmil Holding Company LLC

Placas Termodinamicas S.A. de C.V.

Triumph Structures - Long Island, LLC

Triumph Investment Holdings, Inc.

Triumph Receivables, LLC

Triumph Instruments -Burbank, Inc.

Triumph Aerospace Systems Group - UK, Ltd.

Triumph Controls - UK, Ltd.

Triumph Group Holdings - UK, Ltd.

Triumph Actuation & Motion Controls Systems - UK, Ltd.

KAMEX Ltd.

Mexmil China, LLC

Triumph Group Holdings - Mexico, LLC

Triumph Group Investment -Mexico, LLC

Triumph Real Estate - Mexico, LLC

Triumph Group -Mexico S. de R.L. de C.V.

Triumph Group -Mexico Inmobiliaria, S de R.L. de C.V.

Triumph Fabrications - St. Louis, Inc.

Triumph Aerostructures, LLC

VAC Industries, Inc.

Triumph Structures - Everett, Inc.

Triumph Aerostructures Holdings, LLC

Triumph Aerostructures Real Estate Investment Co., LLC

Triumph Vought Aircraft Technical Services (Chengdu) Co. Ltd.