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alongside
alongside Of a carrier, in port.
ALOS Advanced land-observing, or observation,
satellite.
ALOTS Airborne lightweight optical tracking system
[precision photograph of ballistic vehicles].
ALP 1 Aircraft landing permit.
2 Aegis Leap program.
AlP Aluminium powder.
ALPA 1 Airline Pilots Association [Washington,
DC20036] (US, Canada).
2 Air Line Pilots Association International [Herndon,
VA20172–1169] (Int.).
Alpas Air Line Pilots’ Association of Singapore.
Alpax Aluminium alloy containing c13 per cent Si, for
intricate castings (1932).
alpha Angle of attack of main wing (α, AOA).
Alpha eta rho International aviation fraternity (office at
St Louis University, Cahokia IL).
alpha exit The first available runway turnoff.
alpha floor Mainly to protect against windshear, system
which automatically applies full power if AOA exceeds
preset value, and earlier if rate of change of TAS/GS
passes preset thresholds.
alpha hinge 1 Crossed-spring pivot (eg in tunnel
balance).
2 Confusingly, drag hinge.
alpha max The maximum attainable AOA with stick
fully back.
alphanumeric Character representing capital letter or
numeral portrayed in precisely repeatable stylised form
either by electronic output (computer peripheral or
display) or printed in same form for high-rate reading by
OCR system.
alpha particle Nucleus of He atom: 2 protons, 2
neutrons, positive charge.
Alpha prot Short for protection, the maximum attainable
stick-free AOA. Auto trim stops there, because there
is no reason to maintain this condition.
alpha speed, α-SPD Safe stall-margin speed (autothrottle
mode setting).
alpha vane Transducer measuring AOA.
Alply Trade name (Alcoa) of sandwich comprising
polystyrene foam between two sheets of aluminium.
ALQA Automatic link quality analysis.
ALQDS All quadrants.
ALQR Air-launch quick reach.
ALR 1 Alerting message [S adds Service].
2 Aircraft (or airborne) liferaft.
3 JETDS code: piloted, countermeasure, passive.
4 Arbeitsgruppe für Luft und Raumfahrt
(Switzerland).
ALRAAM Advanced long-range air-to-air missile.
Alrad Airborne laser ranger and designator.
ALRI Airborne long-range radar input.
Alround Translated= association of aerospace SMEs
(G).
ALS 1 Approach light system (FAR Pt 1).
2 Airfield, or aerodrome, lighting system (CAA).
3 Alert-level standard.
4 Automatic takeoff and landing system (RPV).
5 Advanced launch system, HLLV for SDI (US).
6 Air [or airborne] launch system.
7 All-weather landing system, or (Matcals) subsystem.
8 Augmented , or acquisition, logistics support.
altimeter errors
9 Application layer structure.
10 Advanced life support.
ALSC Advanced logistic systems center (ALFC).
ALSCC Apollo lunar-surface close-up camera.
ALSCU Auxiliary level sense control unit [fuel
transfer].
ALSEP Apollo lunar-surface experiment[s] package.
ALSF Approach lights, sequenced flashing.
ALSIP Clear.
ALSL Alternative landing ship, logistic (UK RAF).
AL/SL Weapon capable of being air-launched or
surface-launched (ie from surface vessel) (USN).
ALSS 1 Air-launched saturation-system [missile].
2 Advanced logistic support site[s].
ALSTG Altimeter setting (ICAO).
alt, ALT 1 Altitude [especially barometric], or altimeter.
2 Alternate [i.e., alternative] airfield or destination].
3 Automatic altitude hold.
4 Attack light torpedo.
5 Approach and landing tests (Shuttle).
6 Automatic, or airborne, link terminal.
7 Airborne laser tracker.
ALTA 1 Association of Local Transport Airlines
[office, Washington DC] (US).
2 Associación Latinoamericana de Transportadores
Aéreos [C adds cargo].
3 Airborne [or advanced] lightweight tactical antenna.
Altair ARPA long-range tracking and instrumentation
radar.
ALTBMD Active layered theatre ballistic-missile
defence.
alternate 1 Incorrectly, has come to mean “alternative”
in flight operations; alternative destination, designated in
flight plan as chosen if landing not possible at desired
destination.
2 As applied to landing gear, flaps, etc, means using
emergency power such as electrically driven pump(s).
alternate hub airport Secondary civil airport at large
traffic centre.
alternating light Intermittent light of two or more alternate
[correct usage] colours.
Alternative simplified credit Laws enabling companies
to claim benefit [currently 12 per cent] on qualified
research spending (US).
alternator A.c. generator.
ALTF Automatic launch test facility, carries out confidence
check on XPDR as aircraft taxies to runway.
ALTG Air and Land, or Air/Land, Technology Group
(UK MoD).
Alt Hold Altitude-hold mode.
altigraph Recording altimeter; generally aneroid barograph,
and thus subject to inaccuracy in pressure/height
relationship assumed in calibration.
altimeter Instrument for measuring and indicating
height. Pressure * is aneroid barometer or atmospheric
pressure gauge calibrated to give reading in height.
Sensitive * has stack of aneroid capsules, refined drive
mechanism to multiply capsule movements with minimal
friction or free play, and setting knob to adjust to different
SL or airfield pressures (or to read zero at airfield height).
In servo-assisted * mechanism is replaced with more accurate
electrical one (see engine *, radio *).
altimeter errors Apart from servo-assisted altimeter, all
pressure altimeters suffer significant lag, so rapid reversal
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