09--Electrotechnology and Fluidics

01	Electrical and Electronic Equipment	Electrical and electronic components, systems and subsystems, such as electric motors, electron tubes, semiconductor devices, integrated circuits, electric switches, electric connectors, electric amplifiers and antennas where the application is not apparent or where there is more than one application. If the application is apparent, see the group where the application is treated.
02	Fluidics and Fluerics	Technology that uses the interaction of flowing gases or liquids to perform fluidic sensing, logic, amplification and control functions, employing devices which have no moving parts. For non-fluidic hydraulic and pneumatic equipment, See 13/07, Hydraulic and Pneumatic Equipment.
03	Lasers and Masers	Devices which amplify electromagnetic waves by stimulated emission of radiation. Includes irasers and uvasers. If the application of the laser or maser is apparent, see the group where the application is treated. See also 14/01, Holography. For laser countermeasures, See 17/04/04, Optical Countermeasures
04	Line, Surface and Bulk Acoustic Wave Devices	Devices such as filters, resonators and oscillators, which employ acoustic waves which propagate along a line or a surface or through the bulk of piezoelectric material to process signals.
. 05	Electrooptical and Optoelectronic Devices	Includes display equipment, photosensitive diodes, phototubes, image tubes, cathode ray tubes, electroluminescent panels, light emitting diodes, light sensitive mosaics, and phototransistors where the application is not apparent or where there is more than one application. If the application of the device is apparent, see the group where the application is treated. For lasers, See 09/03, Lasers and Masers. For optical detection, See 17/05, Optical Detection and Detectors.
06	Acoustooptic and Optoacoustic Devices	Devices that deal with the interactions between acoustic waves and light where the application is not apparent or where there is more than one application. If the application is apparent, see the group where the application is treated.
07	Electromagnetic Shielding	Design, development and application of techniques which will allow operation of electronic equipment in the electromagnetic environment, including shielding from electromagnetic pulses, and which will also allow the prevention of the detection of spurious signals which might radiate from electronic equipment. For shielding to prevent interception of generated signals, See 17/04, Countermeasures, 17/04/01, Radio Countermeasures and 17/04/03, Radar Countermeasures.

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.

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