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active magnetic bearing
active magnetic bearing One which holds shaft in
position by electromagnetic field, with no physical
contact.
active material Many meanings, eg: 1, phosphor, such as
zinc phosphate or calcium tungstate, on inner face of
CRT; 2, parts of electric storage battery that participates
in electrochemical reaction.
active missile Fire-and-forget missile carrying its own
active guidance.
active model A computer-generated [e.g., CAD] model
able to demonstrate the full range of system function.
active munition One having immediate effect (as distinct
from a mine, which is passive).
active noise control Noise-suppressing or countering
systems triggered by noise itself and using sound energy
against itself.
active pilot On long-haul, the pilot fully alert to FMGS,
navigation and other inputs.
active runway Runway currently in use (implied that
flying operations are in progress).
active satellite Satellite with on-board electrical power
sufficient to broadcast or beam its own transmissions.
active stealth Reduction in signature by generating
tailored emissions.
active visual camouflage See counter-illumination.
activity factor See blade activity factor.
ACTP Advanced Computer Technology Project (UK).
ACT-R Air-combat training, rangeless.
Actram Advisory committee on transport of radioactive
material.
ACTS Advanced communications technology satellite.
ACT-Tilt Active control technology for tilt-rotor.
ACT-TO Actual time and fuel state at takeoff.
actual ground zero Point on surface of Earth closest to
centre of nuclear detonation.
actuator Device imparting mechanical motion, usually
over restricted linear or rotary range and with intermittent
duty or duty cycle.
actuator remote terminal Connects the powered flightcontrol
unit in a distributed flight-control system, databus
feeding through digital processor to close pilot analog
loop and provide redundancy.
AC2 Aircraftman, 2nd Class (RAF, most numerous
WW2 rank).
AC 2 ISRC Aerospace Command and Control Intelligence,
Surveillance, Reconnaissance Center (USAF).
ACU 1 Gas-turbine acceleration control unit.
2 Avionics [or autopilot, or audio, or auxiliary, or
acceleration, or apron, or airborne, or adaptive, or annotation,
or antenna] control unit.
3 Airborne computer unit.
acute dose Total radioactive dose received over period
so short that biological recovery is not possible.
ACV 1 Air-cushion vehicle.
2 Escort (or auxiliary) aircraft carrier (CVE from 1943).
3 Achieved coverage volume (satellite antenna).
ACVC Ada compiler validation capability.
ACW 1 Aircraft control and warning.
2 Air Control Wing (USAF Awacs).
ACWAR, Acwar Agile continuous-wave acquisition
radar.
ACyc Anti-cyclone, anti-cyclonic.
ACZ Airfield, or aerodrome, control zone.
ADAMD
AD 1 Airworthiness Directive (national certifying
authorities).
2 Advisory route (FAA).
3 Aligned discontinuous (FRP).
4 Aerodrome (ICAO).
5 Air defence.
6 Area-denial munition.
7 Aerial delivery (ramp-door position).
8 Autopilot disconnect.
9 Air diagram, followed by number.
10 Armament Division (AFSC).
11 Air Division (USAAF, USAF).
12 Accidental damage.
13 Aerodynamic disturbance (which see).
14 Ashless dispersant.
15 Assistant Director (UK).
16 Administrative domain.
17 Air Depot (RFC, SAAF).
18 Automatic differentiation.
19 Attack display.
A/D 1 Air defence.
2 Alarm and display.
3 Aerodrome (common UK usage).
4 Analog/digital.
Ad Aerodrome (DTI, CAA).
a/d Aerodrome [trad.abb.].
ADA 1 Advisory area.
2 Air-defence alert [or artillery].
3 Aeronautical Development Agency (India).
4 Air-defended area.
5 Business-aviation association (R).
6 Americans with disabilities act.
7 Avion de détection aéroportée (Awacs, F).
8 Association de Documentation Aéronautique (F).
9 Adaptive data analysis [see VDA3].
Ada Standard common high-order language for US
DoD software (trademark).
ADAAM Air-directed air-to-air missile.
ADAAPS Aircraft data acquisition, analysis and
processing system.
ADAC 1 STOL (F).
2 Active-radar seeker (F).
Adacs 1 Alarm distributed-access control system.
2 Airborne digital automatic collection system.
ADAD Air-defence alerting device, horizon-scanning
IR surveillance system.
ADAE Air Display Association Europe (Dunston,
Lincs., UK).
ADAHRS Air-data attitude/heading reference system.
ADAIRS Air-data and inertial-reference system.
Adam, ADAM 1 Air deflection and modulation.
2 Automated deposition of advanced (or aircraft)
material (filament winding).
3 Automated data for aerospace maintenance.
4 Advanced dynamic anthropomorphic manikin.
5 Aerospace data miner.
6 Air-defence air-mobile [or air defense anti-missile] [in
each case, S adds system].
7 [Also ADaM] aerostat design and manufacture
[J-lens].
8 Air-defense airspace management (USA).
9 Advanced aero-engines materials [research] (UK).
ADAMD Air Defence and Aerospace Management
Directorate (NATO).
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