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Apt
3 Automatic, or automated, powerplant test [U adds
unit].
4 Advanced passive technology.
5 Airport.
6 Aircrew procedure[s] trainer.
Apt Airport.
APTA American Public Transportation Association.
APTS 1 Automatic picture-transmission system.
2 Airport, port and terminal security.
APTT Aircrew part-task trainer.
APTU Aerodynamic and Propulsion unit.
AP-25 C of A (R).
APU 1 Auxiliary power unit; /GCU adds generator
control unit.
2 Weapon release unit (R).
3 Automatic pull-up.
APUC 1 APU controller.
2 Average program unit cost.
APV 1 Autopiloted vehicle.
2 Accumulated project value.
3 Approved.
4 Approach with vertical guidance.
APVO See IA-PVO
APW 1 Automatic pitch warning, required on aircraft
[eg, SR-71] with possible low or negative pitch stability.
2 Aircraft, or airborne, proximity warning; I adds indicator,
S system.
APXS Alpha-proton, or particle, X-ray spectrometer.
AQAD Aeronautical Quality-Assurance Directorate
(MoD-PE, now Qinetiq, UK).
Aquabrasive 330 Sand/water mix for high-velocity stripping
of markings or sealant from airfield paved surfaces.
AQAP Allied quality-assurance publication (NATO).
AQB Advanced quadrature band.
AQC Aviator Qualification Course [or Certificate]
(USA).
AQD Operational airline quality determination
programme.
AQF Avionics qualification facility.
AQL 1 Agreed quality level [material specifications,
dimensional tolerance, etc].
2 Advanced quick look (Guardrail).
AQP 1 Advanced qualification program [US commercial
pilots].
2 Avionics qualification procedure.
A-QPSK Aeronautical quadrature phase-shift keying.
AQR Airline quality rating.
AQS Advanced quality system.
AQ-SAP Acquisition special-access program.
aquaplane To run wheeled vehicle, esp. landing aircraft,
over shallow standing water at so high a speed that weight
is supported wholly by dynamic reaction of water; tyres,
out of ground contact, unable to provide steering or
braking. An empirical formula is V a = 9√p where V a is
aquaplaning speed in knots and p is tyre pressure in lb/in 2 .
aqueous Pertaining to water, thus * solution.
Aqueous film-forming foam Typically 3 to 6 per cent
halon/Halotron/BCF or other firefighting agent and 97 to
94 per cent water.
Aquila Code address of EQD.
AQZ Area QNH zone.
AR
1 Air [aerial, airborne] refuelling.
2 Air receive.
3 Aspect ratio.
arc
4 Alternative route.
5 Army [or Air] Regulation.
6 or A/R, altitude reporting.
7 Air radar.
A/R Approach/reverse (nozzle mode).
AR Aspect ratio (US).
ARA 1 Aircraft Research Association [Bedford MK41
7PF] (UK, 1953–).
2 Airborne-radar approach.
3 Airspace restricted area.
4 Airborne Research Australia.
5 Alternative reference area.
6 Air-refuelling area (RAF).
7 Avanced Ram analysis [M adds method].
8 Anti-radar attack (UAV).
9 Advisory radio area.
10 Atmospheric research aircraft (FAAM 3).
ARAC Aviation Rulemaking Advisory Committee
(FAA).
Arades Automatic radar evaluation system and jammer
test set.
Araldite Trade name (Ciba) of two-component (resin +
hardener) epoxy-based adhesive used in airframe structural
bonding.
ARALL, Arall Aramid/aluminium laminate(s).
aramid fibre Man-made fibre of extraordinary tensile
strength, so named because of its chemical and physical
similarity to spider-web fibre; see Kevlar.
Aramis 1 Area multiple intercept system (radar).
2 Advanced runway arrivals management to improve
airport safety and efficiency (Euret).
AR&M Availability, reliability and maintainability.
AR&TF Aircraft Repair and Transportation Flight
(RAF).
ARAS Auto refuelling assembly system.
ARASP Advanced radar airborne signal processor.
ARATCC Air Route Air-Traffice-Control Center
(FAA).
ARB 1 Air Registration Board, then Airworthiness
Requirements Board, now Airworthiness Review Board,
part of EASA. (UK).
2 Air Research Bureau (BRA, ICAO).
3 Air Reserve, or Rescue, Base (USAF).
4 Arbitrary waveform generator.
arbitrary landing distance See ALD.
arbitrated loop A database topology which can link