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ADDS
ADL
ADDS 1 Airborne-decoy [or advanced digital]
dispensing system.
2 Aerial delivery dispersal system.
add time Time required for single (binary) addition
operation in computer arithmetic unit.
ADE 1 Automated draughting (drafting) equipment.
2 Aeronautical Development Establishment (India).
3 Ada development environment.
4 Australian Defence Executive.
5 Airframe design environment [software].
Adecs, ADECS Advanced digital engine control system.
ADEG Air traffic services data-exchange requirements
group (ICAO).
Adela Aircraft directed-energy laser applications
(AFRL).
Adèle Alerte detection et localisation des emitteurs (F).
ADELT Automatically deployable emergency locator
transponder, or transmitter.
Adem Advanced diagnostic and engine monitoring.
Aden Armament Development, Enfield (UK, formerly).
ADEN Augmented deflector [or deflecting] exhaust
nozzle.
Adeos Advanced Earth-observing satellite.
ADEU Automatic data-entry unit (punched card input
for STOL transport navigation).
Adews Air-defense EW system (USA).
Adex, ADEX Air defence exercise.
ADEXP ATS (1) data-exchange presentation message
format.
ADF 1 Automatic direction-finding or finder. Airborne
radio navaid tuned to NDB or other suitable LF/MF
broadcast source. Until 1945 aerial was loop mounted in
vertical plane and rotated by motor energised by amplified
loop current to rest in null position, with plane of loop
perpendicular to bearing of ground station. Modern
receivers fed by two fixed coils, one fore-and-aft and the
other transverse, suppressed flush with aircraft skin
(usually on underside).
2 Australian Defence Force; (A adds Academy).
3 Air-dominance fighter.
4 Anti-icing/de-icing fluid.
5 Airline Dispatcher Federation (office, DC).
ADFA Australian Defence Force Academy (Campbell,
ACT).
ADFC Aligned discontinuous fibre composite.
ADF sense aerial Rotatable loop null position gives two
possible bearings of ground station;** is added to give
only one null in each 360° of loop rotation.
ADG 1 Auxiliary drive generator.
2 Air-driven generator.
3 Accessory drive gear, or generator.
4 Aircraft delivery group (USAF).
5 Airplane Design Group (FAA).
ADGB Air Defence of Great Britain (1943–44).
ADGBS Air-defence ground-based system (RAF).
ADGE, Adge Air defence ground environment, or
equipment.
ADGS 1 Air-defence gunsight.
2 Aircraft docking guidance system.
ADI 1 Attitude director [rarely, display] indicator. 3-D
cockpit display forming development of traditional
horizon and usually linked with autopilot and other
elements forming flight-director system. Most can function
in at least two modes, en route and ILS, and in former
can provide navigational steering indications.
2 Anti-detonant injection, such as cylinder-head injection
of methanol/water, for high-compression piston
engine.
3 Air Defense Initiative, partner ideas for SDI-type
international joint ventures (US DoD).
4 Aerospace and Defence Industries Directorate [1 to 4]
(DTI, UK).
5 Azimuth display indicator.
6 Assistant Director of Intelligence.
adiabatic Thermodynamic change in system without
heat transfer across system boundary. In context of Gas
Laws, possible to admit of exact* processes and visualise
them happening; shockwave, though not isentropic, is
not* in classical sense because thermodynamic changes
are not reversible.
adiabatic flame temperature Calculated temperature of
combustion products within rocket chamber, assuming
no heat loss. Symbol T c .
adiabatic lapse rate Rate at which temperature falls
(lapses) as height is increased above Earth’s surface up to
tropopause (see DALR, ELR, SALR).
ADIAE Aerospace and Defence Industries Association
of Europe (Int.).
Adians, ADIANS Aerospace and Defence Industries
Association of Nova Scotia. [1995–].
ADIB Air-deployable ice beacon.
ADID Aircraft-data interface device.
ADIMP Ada improvement programme (UK).
Adints, ADINTS Automatic depot inertial navigation
test system.
ADIR Air-data [and] inertial-reference (see next and
ADIRU).
ADIRS 1 ADIR system.
2 Airfield damage information and reporting system.
ADIRU Air-data [and] inertial reference unit.
ADIS 1 Airport-data information system, or source.
2 Automatic data-interchange system (FAA, from
1961).
3 ADS(5) datalink interim system (Australia).
4 Airport display information system (NAS/LATCC).
ADIT Automatic detection, identification and tracking
(USA).
ADITT Aerially deployable ice-thickness transponder.
ADIVS Air-defense interoperabilty validation system.
ADIZ Air-defence, or defense, identification zone.
ADJ Adjacent.
adjacent channel Nearest frequency above or below that
on which a radio link is working; can interfere with carrier
or sidebands, but ** simplex minimises this.
adjustable propeller One whose blades can be set to a
different pitch on ground, with propeller at rest.
adjustable tailplane [horizontal stabilizer] Surface which
can be reset to different incidence only on ground.
adjuster Mechanical input (manual, powered or remotecontrol)
for altering a normally fixed setting, such as
engine idling speed.
Adkem Advanced kinetic-energy missile.
ADL 1 Automatic drag limiter [S adds system].
2 Arbeitsgemeinschaft Deutscher Luftfahrt-
Unternehmen (G).
3 Armament datum line.
4 Authorised data list.
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