This U.S. industry comprises establishment primarily engaged in (1) manufacturing aircraft parts or auxiliary equipment (except engines and aircraft fluid power subassemblies) and/or (2) developing and making prototypes of aircraft parts and auxiliary equipment. Auxiliary equipment includes such items as crop dusting apparatus, armament racks, inflight refueling equipment, and external fuel tanks. Establishments primarily engaged in manufacturing aircraft engines and engine parts are classified in U.S. Industry 336412, Aircraft Engine and Engine Parts Manufacturing; Establishments primarily engaged in manufacturing aeronautical instruments are classified in U.S. Industry 334511, Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing; Establishments primarily engaged in manufacturing aircraft lighting fixtures are classified in U.S. Industry 336321, Vehicular Lighting Equipment Manufacturing; Establishments primarily engaged in manufacturing aircraft engine electrical (aeronautical electrical) equipment are classified in U.S. Industry 336322, Other Motor Vehicle Electrical and Electronic Equipment Manufacturing; Establishments primarily engaged in manufacturing guided missile and space vehicle parts and auxiliary equipment are classified in U.S. Industry 336419, Other Guided Missile and Space Vehicle Parts and Auxiliary Equipment Manufacturing; Establishments primarily engaged in manufacturing of aircraft fluid power subassemblies are classified in U.S. Industry 332912, Fluid Power Valve and Hose Fitting Manufacturing; Establishments primarily engaged in manufacturing of aircraft seating are classified in Industry 336360, Motor Vehicle Seating and Interior Trim Manufacturing; and Research and development establishments primarily engaged in aircraft parts and auxiliary equipment R&D (except prototype production) are classified in Industry 541710, Research and Development in the Physical, Engineering, and Life Sciences.
