01 -- Aviation Technology

01 Aerodynamics 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.
02 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.
03 Aircraft 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.
03/01 Helicopters Includes attack helicopters. For civilian helicopters, See 01/03/09, Civilian Aircraft.
03/02 Bombers
03/03 Attack and Fighter Aircraft
03/04 Patrol and Reconnaissance Aircraft Includes observation aircraft.
03/05 Transport Aircraft Includes tanker aircraft.
03/06 Training Aircraft
03/07 V/STOL
03/08 Gliders and Parachutes Includes paragliders and kites, for both military and civilian applications.
03/09 Civilian Aircraft Does not include aircraft modified for military use.
03/10 Pilotless Aircraft R.P.V.; Drones. Includes full size aircraft when configured as drones.
03/11 Lighter-than-air Aircraft Airships, blimps, dirigibles, balloons, for both civilian and military applications.
03/12 Research and Experimental Aircraft Includes aerospace aircraft.
04 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.
05 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.
06 Commercial and General Aviation Civil aircraft operations, as described in 01/02. Also includes civil airport passenger and vehicle traffic studies.