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Acost
Acost Advisory Committee on Science and Technology
(UK).
ACostE Association of Cost Engineers (UK).
Acoubuoy Acoustic sensor dropped by parachute into
enemy land area.
Acousint, acousint Acoustic intelligence.
acoustic Associated with sound, and hence material
vibrations, at frequencies generally audible to human
beings.
acoustic absorption factor Rate at which acoustic energy
is incident on a surface divided by that measured on inner
face of material. Varies greatly with frequency.
acoustical tailpipe The final nozzle assembly in a
hushkit.
acoustic delay line In computer or other EDP device,
subsystem for imparting known time delay to pulse of
energy; typically closed circuit filled with mercury in
which acoustic signals circulate (obs.).
acoustic feedback Self-oscillation in radio system caused
by part of acoustic output impinging upon input.
acoustic impedance Resistance of material to passage of
sound waves, measured in acoustic[al] ohms.
acoustic intelligence Self-explanatory; in the past has
primarily involved undersea warfare.
acoustics In ASW, sonar and other sensing systems
relying on underwater sound; thus * operators, * displays.
acoustic splitter Streamlined wall introduced into flow
of air or gas, parallel to streamlines, for acoustic purposes.
Usually inserted to reduce output of noise, for which
purpose both sides are noise-absorbent. Many are radial
panels and concentric long-chord rings (open-ended
cylinders).
acoustic tube Miniature acoustic/electric transducer
which has replaced carbon or other types of microphone
in aircrew headsets.
acoustic tuning Fine adjustment of shape to achieve
desired aerodynamics, esp. in separation of stores.
ACP 1 Airborne [or airlift] command post.
2 Anti-Concorde Project.
3 Altimeter check point.
4 Armament control panel.
5 Africa, Caribbean, Pacific.
6 Audio control panel, or convertor processor.
7 Aerosol collector and pyroliser.
8 Aluminised composite propellant.
9 Acquisition Change Programme [2006–] (MoD, UK).
ACP, Acp Acceptance message.
ACPA Adaptive-controlled phased array.
ACP(C) Automatic communications processor
(control).
ACPL Atmospheric Cloud Physics Laboratory.
AC-plonk AC2 (derogatory reference to this low rank in
RAF, 1941–50).
ACPMR Automatic communications processor and
multiband radio.
ACPT, Acpt Accepted.
acquisition 1 Act of visually identifying, and remembering
location of, object of interest (specific ground or aerial
target).
2 Detection of target by radar or other sensor (plus,
usually, automatic lock-on and subsequent tracking).
3 Detection and identification of desired radio signal or
other broadcast emission.
4 Act of reaching desired flight parameter, such as
ACSE
heading, FL or IAS, or desired point or axis in space such
as ILS G/S or LOC (see capture).
acquisition round AAM (1) without propulsion, and
usually without wings or fins, carried to provide practice
in homing head lock-on.
acquisition scan window 3-D block of airspace into
which a VAV can easily be guided, wherein CARS or
UCARS acquires it and feeds it to the RIW.
ACR 1 Aerial combat reconnaissance.
2 Air [or airfield, or approach] control radar.
3 Advanced cargo rotorcraft.
4 Active cockpit rig.
5 Avionics communication[s] router.
6 Aeroklub Ceske Republiky (Czech Rep.).
ACRA, Acra Airlift Concepts and Requirements
Agency (USA/USAF).
ACRB Aéro-Club Royal de Belgique [B-1000 Brussels]
(Belgium).
ACRC Aircrew Reception Centre, (UK, WW2).
acre Old Imperial (FPS) unit of land surface area, equal
to 0.40469 ha (1 ha = 2.47105 acres). For covered area
(factory buildings etc) usual SI unit is m 2 (= 0.000247105
acre, so 1-acre plant = 4,047 m 2 ).
acreage Superficial area of flight vehicle, especially
spacecraft or aerospace craft, as distinct from nose and
other parts that need ablative or other special protection.
Ac-Rep Representative, usually of country of manufacture,
accredited to accident investigation.
Acris Air control recording and information system.
ACRM Aircrew resource management.
acrobatics Usual term is aerobatics.
ACRP Airport Co-operative Research Program (TRB).
ACRR Airborne communications restoral relay.
ACRS Air Crew Refresher School (RAF WW2).
ACRT Additional cross-reference table.
ACRV Assured crew-rescue vehicle.
ACRW Aircraft [aeroplane] with circular rotating wing.
acrylics[s] Thermosetting plastic[s], usually transparent,
based on polymerised esters of * acid; original tradename
Perspex (ICI, UK) and Plexiglas (Rohm & Haas, US).
Since 1950 improved transparencies result from stretching
moulded part prior to setting.
ACS 1 Attitude, or armament, or avionics, or active, or
audio, or auxiliary, control system.
2 Aeroflight control system, for use by spacecraft
within atmosphere.
3 Air-conditioning system.
4 Air Commando Squadron (USAF).
5 Air Control Squadron.
6 Aircraft Certification Service (FAA).
7 Airframe consumable spares.
8 Advanced crew station.
9 Aerial [ie, airborne] common sensor (USA, USN).
10 Air-combat simulator.
11 Assembly & Command Ship (Sea Launch).
ACSA 1 Allied Communications Security Agency
(NATO).
2 Aero Club of S Africa.
3 Aeronautical Safety for Central America (Belize,
Costa Rica, El Salvador, Guatemala, Honduras).
ACSC Air Command and Staff College (USAF,
Maxwell AFB).
ACSE Access control and switching, or signalling,
equipment (Aerosat ground station).
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