Establishments primarily engaged in manufacturing aircraft parts and auxiliary equipment, not elsewhere classified. This industry also includes establishments owned by manufacturers of aircraft parts and auxiliary equipment and primarily engaged in research and development on aircraft parts, whether from enterprise funds or on a contract or fee basis. Establishments primarily engaged in manufacturing or assembling complete aircraft are classified in Industry 3721; those manufacturing aircraft engines and parts are classified in Industry 3724; those manufacturing aeronautical instruments are classified in Industry 3812; those manufacturing aircraft engine electrical (aeronautical electrical) equipment are classified in Industry 3694; and those manufacturing guided missile and space vehicle parts and auxiliary equipment are classified in Industry 3769. Establishments not owned by manufacturers of aircraft parts but primarily engaged in research and development on aircraft parts on a contract or fee basis are classified in Services, Industry 8731.

• Adapter assemblies, hydromatic propeller
• Ailerons, aircraft
• Aircraft armament, except guns
• Aircraft arresting device system
• Aircraft assemblies, subÄassemblies, and parts, except engines
• Aircraft body assemblies and parts
• Aircraft power transmission equipment
• Aircraft propeller parts
• Airframe assemblies, except for guided missiles
• Airplane brake expanders
• Alighting assemblies (landing gear), aircraft Beaching gear, aircraft
• Blades, aircraft propeller: metal or wood
• Bomb racks, aircraft
• Brakes, aircraft
• Chaffing dispensers, aircraft
• Countermeasure dispensers, aircraft
• Deicing equipment, aircraft
• Dive brakes, aircraft
• Dusting and spraying equipment, aircraft
• Dynetric balancing stands, aircraft
• Elevators, aircraft
• Empennage (tail) assemblies and parts aircraft
• Fins, aircraft
• Flaps, aircraft wing
• Fuel tanks, aircraft: including self-sealing
• Fuselage assemblies, aircraft
• Gears, power transmission: aircraft
• Governors, aircraft propeller feathering
• Hubs, aircraft propeller
• Instrument panel mockups: aircraft training units
• Landing gear, aircraft
• Landing skis and tracks, aircraft
• Link trainers (aircraft training mechanisms)
• Nacelles, aircraft
• Oleo struts, aircraft
• Oxygen systems for aircraft
• Panel assemblies (hydromatic propeller test stands), aircraft
• Pontoons, aircraft
• Propeller alining tables
• Propellers, variable and fixed pitch and parts-aircraft
• Pumps, propeller feathering
• Refueling equipment, airplane: for use in night
• Research and development on aircraft parts and auxiliary equipment
• Roto-blades for helicopters
• Rudders, aircraft
• Seat ejector devices, aircraft
• Spinners, aircraft propeller
• Stabilizers, aircraft
• Target drones, aircraft
• Targets, trailer type: aircraft
• Tow targets, aircraft
• Training aids, aircraft: except electronic
• Transmissions, aircraft
• Turret test fixtures, aircraft
• Turrets and turret drives, aircraft
• Wheels, aircraft
• Wing assemblies and parts, aircraft