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asynchronous
lines meet at infinity. Thus, asymptotic, where slope of
plotted curve becomes parallel to either x or y axis.
asynchronous Not synchronised, not in frequency or
phase.
asynchronous computer Electronic computer, usually
digital, in which operations do not proceed according to
timing clock but are signalled to start by completion of
preceding operation.
ASZ Air surface zone (NATO, USAF).
AT 1 Advanced trainer (USAAF category, 1924–48).
2 Anti-tank.
3 Autogenic training.
4 Autothrottle [also A/T].
5 Air transmit.
6 Armament trainer (F-22).
7 Air transport (role of tanker).
8 All traffic.
9 Advanced targeting.
AT 3 See ATTT.
ATA 1 Air Transport Auxiliary, UK ferry organization
1940–45; also the Association, 1946– [office, Chipping
Sodbury BS17 6XG]..
2 Air Transport Association of America [scheduled
carriers, office, Washington DC20004-1707] (US).
3 Actual time of arrival.
4 Advanced tactical aircraft.
5 Air Transport Association (UK).
6 Automatic target-acquisition.
7 Aero Testing Alliance (F, G, Neth.).
8 Aviation Training Association [office, High
Wycombe, HP13 6LS] (UK).
9 Airport traffic area.
10 Airline-tariff analysis.
11 Advanced testbed[s] for avionics.
12 Aerial tactics area.
13 Air Traffic Alliance [Airbus, EADS, Thales, 2003–]
(Int.).
ata Atmosphere[s] pressure; 1 ata [atm in UK] = 101.325
kPA = 14.6959 lb/in 2 .
ATAAC Anti-torpedo air-launched countermeasure[s].
ATAAS Advanced terminal area approach spacing.
ATAB Air Transport Allocations Board, joint agency in
theatre of operations which assigns priorities to loads.
ATAC 1 Air Transport Association of Canada [office,
Ottawa].
2 Applied-technology advanced computer (airborne
EW).
3 Air-transportable acoustic communication[s],
expandable buoy.
ATACC Advanced tactical air command center
(USMC).
ATACMS Army tactical missile system[s] (USA).
Ataco Air Tactical Control Officer.
ATAF 1 Allied Tactical Air Force (NATO).
2 Association Internationale des Transporteurs
Aériens [acronym from previous title; F-75008 Paris] (F).
ATAFCS Airborne target acquisition and fire-control
system.
ATAG Air Transport Action Group, coalition pressing
for better infrastructure [CH-1215 Geneva 15] (Int.).
Atags Advanced-technology anti-g suit (USAF).
ATAL, Atal 1 Automatic test application language.
2 Appareillage de TV sur aéronef léger (F).
Atcap
ATALS Army Transportation and Logistics School
(USA).
ATAM Air-to-air Mistral.
ATAOS Autonomous tactical attack and observation
system.
ATAP Advanced tactical-, or target-, attack penetrator.
ATAR 1 Air-to-air recognition (device).
2 Air-to-air recovery.
3 Advanced threat-alert and response; CE adds critical
experiment (USAF).
4 Association des Transporteurs Aériens Régionaux
(F).
Atares Air-transport and air-refuelling exchange of
services (European Air Group).
Atars 1 Automatic traffic-advisory and resolution
service (UK).
2 Advanced tactical air-reconnaissance system.
3 Aircrew training and rehearsal support (USAF).
ATAS, Atas 1 Air Traffic Advisory Service, provides
separation between known aircraft in IFR on certain
routes (UK DTI).
2 Advanced target-acquisition sensor.
3 Air-to-air Stinger.
4 Automated talking advisory system (FAA).
5 Advanced tactical airborne system.
ATATS Automatic target-acquisition and trackingsystem.
Ataws Advanced tactical air-warfare system.
ATB 1 Advanced-technology bomber.
2 Air-Transport Bureau (ICAO).
3 Aerospace Technology Board.
4 Automated ticket and boarding pass.
5 Advanced-technology blade (HP turbine).
6 Air turn back [mission abandoned while en route].
ATBM Anti-tactical, or anti-theater, ballistic missile.
ATC 1 Air traffic control; C adds centre.
2 Air Training Corps (replaced ADCC in 1941; HQ
Air Cadets, RAF College, NG34 8HB] (UK).
3 Air Training Command (USAF, from 15 April
1946).
4 Air Transport Command, formed from Air Ferrying
Command 1 July 1942, became MATS.
5 Approved Type Certificate, first issued (by DoC) in
1927.
6 Advanced-technology component (DoD).
7 Aerospace Technical Council (AIAA).
8 Air transport conference (travel agencies).
9 Automatic [usually EW] threat-countering.
10 After top centre.
11 Acoustic-torpedo countermeasures.
12 Automatic tuning control.
13 Astronomy Technology Centre (Edinburgh, UK).
14 Airport traffic control (US DoC 1938).
15 Auxiliary, or ancillary, terrestrial component. [=
CGC].
ATCA 1 Air Traffic Control Association of America
[1955–, office Arlington, VA22201] (US).
2 Air Traffic Conference of America.
3 Allied Tactical Communications Agency (NATO,
Brussels).
4 ATC Assistant (UK).
5 Advanced tanker/cargo aircraft (USAF).
ATCAC ATC Advisory Committee (US Congress).
Atcap 1 ATC Automation Panel (ICAO).
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