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aperture card
aerial, through which all radiation is intended to pass (ie
all except diffuse stray radiation).
aperture card Standardised unit in microfilm filing,
comprising frame of microfilm mounted in card border;
stored, retrieved and projected automatically.
aperture management Design of radar cavities and apertures
to eliminate multiple reflections.
Apex 1 Advanced project for European information
exchange, linking all major EC airframe companies.
2 Advanced passenger, or purchased, excursion fare,
one of many forms of air carrier fare and flight coupon.
3 Application Executive.
apex 1 Highest point in canopy of parachute in vertical
descent.
2 In a plan view of a wing, the point where the projected
leading edge cuts the aircraft centreline.
APF 1 Association des [female] Pilotes Françaises [F-
75116 Paris] (F)..
2 Adhesive polymer film.
APFA Association of Professional Flight Attendants
(US).
APFC Air-portable fuel container [or cell].
APFD Autopilot flight director.
APFSDS Armour-piercing fin-stabilized discarding
sabot.
APG 1 JETDS code: piloted aircraft, radar, fire control.
2 Automatic program generator, requires only component
and netlist input.
3 Aberdeen Proving Ground, MD (USA, but used by
other US services).
4 Air Platforms Group (DSTL, UK).
5 Airplane General [mechanic category] (US).
APGC Air Proving Ground Command (USAF,
defunct).
APGM Autonomous precision-guided missile [or munition].
APGS Auxiliary power generation system.
APHAZ Aircraft proximity hazard[s], panel investigating
airproxes filed by controllers [as distinct from
[JAWG].
aphelion Point in solar orbit furthest from Sun.
Aphids Advanced panoramic helmet interface demo
system.
API 1 Air-position indicator.
2 Armour-piercing incendiary.
3 American Petroleum Institute [office, Washington
DC].
4 Associazione Pilote Italiane [women pilots; office,
I-00198 Rome] (Italy).
5 Application program[ming] interface.
6 Air-photo interpreter.
7 Airframe/propulsion integration [also A/PI].
8 Aim-point initiative.
9 Ascent-phase intercept.
10 Application programming interface.
11 Application implementation.
12 Advance[d] passenger information.
APICS Automatic pressure indication and control
system.
APIHC Armour-piercing incendiary hard core.
apiquage According to a 1935 authority “Rotation of an
aircraft about its lateral axis in the sense which decreses
its angle of incidence (there is no English equivalent).”
APP
APIRG African region Planning and Implementation
Regional planning Group (ICAO).
APIRS Aircraft piloting inertial reference system, or
strapdown sensor.
APIS 1 Apogee/perigee injection system.
2 Automatic priority interrupt system, for large
computer systems with multi-programming.
3 Aircraft parking information system [docking
guidance].
4 Air passenger information system.
APKWS Advanced precision-kill weapon system
(USA).
APL 1 Acceptance performance level.
2 Applied Physics Laboratory of JHU.
APLA Asociación de Pilotos de Lineas Aéreas (Arg.).
aplanatic Free from spherical aberration.
APLS 1 Automated ply laminating system.
2 Articulated patient loading system.
APM 1 Aluminium powder metallurgy.
2 Aircraft performance monitoring.
3 Aviation de Patrouille Maritime (F).
4 Assistant programme manager.
APMS Automatic performance-management system
(also, in US, rendered as advanced power management
system) or automated performance measurement system.
APN 1 JETDS code: piloted aircraft, radar, navaid.
2 Aircraft procurement, Navy (US).
3 Arinc packet network.
4 Aircraft pallet net.
APNA Association des Professionnels Navigants de
l’Aviation [F-75015 Paris] (F).
A.P.970 See Av.P.970
apoapsis Point in orbit furthest from primary;
apocentre.
apoastron Furthest point in orbit round star.
APOB, Ap Ob Airplane observation [of weather].
apocynthion Point in lunar orbit furthest from Moon.
APOD Airport of debarkation.
APOE Air (or aerial) port of embarkation.
apogalacticon Furthest point in orbit round galaxy.
apogee Point in geocentric (Earth) orbit furthest from
centre of Earth (in near-circular polar orbit equatorial
bulge could result in satellite being closer to surface at
equatorial apogee than at polar perigee).
apogee motor Apogee kick motor or kick motor, small
rocket designed to impart predetermined (sometimes
remotely controllable) velocity change (delta-V) to satellite
or spacecraft to change orbit from an apogee position.
Apollo Applications Program, AAP Much altered and
largely defunct NASA programme intended to make
maximum and earliest post-Apollo use of Apollo technology.
Major portion evolved into Skylab; other AAP
being built in to various plans for future manned and
unmanned spaceflight, include Shuttle missions.
apolune Apocynthion of spacecraft departed from
Moon into lunar orbit.
APOR Automated purchase order rescheduling system.
apostilb Non-SI unit of luminance equal to 1/π international
candle (candela) m –2 or 10 –4 lambert (see
luminance).
Apota Automatic-positioning telemetering antenna.
APP 1 Approach (DTI, UK).
2 Approach control office (ICAO).
3 Approach pattern.
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