||Flight characteristics and problems of full-scale or model aircraft and their components as they are affected by the dynamics of air; Flight testing and wind tunnel testing. Includes theoretical and experimental aerodynamics as applied to missiles, See 16/02/01, Guided Missile Dynamics, Configurations and Control Surfaces. For the behavior of spacecraft in air, see 22/03, Spacecraft Trajectories and Reentry. For the aerodynamics of ground structures, see 13/13, Structural Engineering and Building Technology.
||Military Aircraft Operations
||Military aircraft operations such as takeoff Operations and landing, air traffic, all weather and night flight, taxiing, approach, and inflight refueling; Flight safety; Ground safety; Aviation accident studies; Aircraft simulators and training devices. For missile operations, see Field 16, Guided Missile Technology. For spacecraft operations, See Field 22, Space Technology. For navigation and air traffic control, see 17/07/03, Air Navigation and Guidance.
||Design, production, and maintenance of aircraft, aircraft components, and aircraft equipment; Structural studies of complete aircraft components such as airframes, bodies, and wings. Airworthiness; Crashworthiness; Aircraft damage assessment and vulnerability studies; effects of gunfire and blast on aircraft and flight equipment. For civilian aircraft, See 01/03/09, Civilian Aircraft. For specific types of aircraft, See subgroups 01/03/01 - 01/03/12. See also Field 16, Guided Missile Technology and Field 22, Space Technology.
||Includes attack helicopters. For civilian helicopters, See 01/03/09, Civilian Aircraft.
||Attack and Fighter Aircraft
||Patrol and Reconnaissance Aircraft
||Includes observation aircraft.
||Includes tanker aircraft.
||Gliders and Parachutes
||Includes paragliders and kites, for both military and civilian applications.
||Does not include aircraft modified for military use.
||Pilotless Aircraft R.P.V.; Drones.
||Includes full size aircraft when configured as drones.
||Airships, blimps, dirigibles, balloons, for both civilian and military applications.
||Research and Experimental Aircraft
||Includes aerospace aircraft.
||Flight Control and Instrumentation
||Instruments, sensors, displays and recorders necessary for control and monitoring the flight of an aircraft; Cockpit and cabin display devices and onboard checkout systems; Onboard navigation display devices; Automatic pilots; Stability and control systems; Boundary layer control systems; Dynamic and static control devices. If the application of a flight control system is apparent, see the field where the application is treated. For devices used to compute flight times and headings, See 17/07/03, Air Navigation and Guidance.
||Terminal Flight Facilities
||Airports; Military air bases; Runways; Hangars; Ground refueling systems; Heliports; Aircraft handling and maintenance equipment; Taxiways; Parking aprons; Crash and fire facilities. For air traffic control systems, See 17/07/03, Air Navigation and Guidance.
||Commercial and General Aviation
||Civil aircraft operations, as described in 01/02. Also includes civil airport passenger and vehicle traffic studies.