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analog computer
in second colour (eg blue). Viewed through corresponding
(eg blue/red) spectacles, result appears three-dimensional.
analog computer 1 Computational device functioning
by relating or operating upon continuous variables (in
contrast to digital computers, which operate with discrete
parcels of information). Simplest example, slide-rule.
2 Electronic computer in which input data are continuously
variable values operated upon as corresponding
electrical voltages. Actual hardware can be coupled
directly in so that, for example, control response, angular
movement and aeroelastic distortion of control surface
can be investigated in situ and in real time.
analog/digital converter, ADC Device for converting
analog output into discrete digital data according to specified
code of resolution; also called digitiser and, esp. for
linear and rotary movement, encoder.
analog output Transducer signal in which amplitude
(typically quasi-steady voltage) is continuously proportional
to function of stimulus.
analyser In piston engine installatons, device intended
to indicate mixture ratio by sampling composition of
exhaust gas (hence EGA, exhaust-gas *). Some for statictest
purposes depend on chemical absorption of carbon
dioxide, but airborne instrument uses Wheatstone bridge
to measure variation in resistance due to proportion of
carbon dioxide in gas.
analysis Stress analysis.
ANAO Australian National Aerospace Organization
[office Yagoona, NSW].
anaprop Anomalous propagation.
ANASA Azerbaijan National Aerospace Agency.
Anasics Alaska National Airspace System Interfacility
Com. System.
Anazot A resin foam for fuel-tank protection.
ANB 1 Air Navigation Bureau (ICAO).
2 Adaptive narrow beam(s).
ANC 1 Air navigation charges.
2 Air Navigation Commission, or Council (both
ICAO).
3 Army/Navy/civil (US).
4 Aviate/navigate/communicate.
5 Active, or acoustic, noise cancellation, or control.
ANCA Airport Noise and Capacity Act [Congress]
(US).
Ancat Abatement of nuisance caused by air transport.
ANCB Association Nationale Contre les Bangs (supersonic)
(F).
anchor-centred Also anchor charge, anchor grain: solid
rocket propellant charge in which initial combustion
surface has cross-section resembling radial array of
anchors, flukes outward.
anchor light Riding light.
anchor line, cable Cable running along interior of
airdrop aircraft to which parachute static lines (strops) are
secured.
anchor-line extension kit Assembly arranged to extend
anchor line to allow airdropping through rear clamshell
doors or aperture with such doors removed.
anchor nut Large family of nuts positively securable by
means of screwed or bolted plate projecting from base (see
nut, nutplate, stiffnut, stopnut).
ANCOA Aerial Nurse Corps of America.
ANCS Active noise control system.
AND 1 Active-nutation damping.
ANG
2 Aircraft nose-down.
3 Army/Navy drawing.
ANDA Associazione Nazionale Direttori di Aeroporto
(I).
ANDAG Associazione Nazionale Dipendenti
Aviazione Generale (I).
ANDB Air Navigation Development Board (US
1948–57).
Anderson shelter Small air-raid shelter assembled from
sheet galvanized-steel pressings in pit and covered with
deep layer of earth (UK, WW2).
AND gate Bistable logic function triggered only when
all inputs are in ON state; in computers used as addition
circuit, performing Boolean function of intersection.
Hence AND/OR gate, AND/NOR, AND/NOT.
AND pad Standard Army/Navy drive accessory pad.
ANDR Air, or airborne, navigation data recorder.
androgynous Mating portions of docking system which
are topologically identical (eg US and Soviet docking
faces).
ANDS 1 Automatic navigation differential station.
2 Accelerate N, decelerate S, mnemonic for NTE (2).
ANDVT Advanced narrow-band digital voice terminal.
anechoic Without echoes; thus, * facility, * room, in
which specially constructed interior walls reduce reflections
to infinite number of vanishingly small ones.
Chamber can be designed to operate best at given wavelength,
with sound, ultrasound, ultrasonic energy,
microwaves and various other EM wavelengths. Mobile
facilities used for boresighting nose radar of combat
aircraft.
anemogram Record produced by anemograph.
anemograph Instrument designed to produce permanent
record of wind speed (ie recording anemometer) and,
usually, direction. Dines * incorporates weathercock vane
carrying pitot and static tubes.
anemometer Instrument for measuring speed of wind,
usually 10 m (32.8 ft) above ground level. Robinson Cup
* has free-rotating rotor with three or four arms each
terminating in a hemispherical or conical cup.
anemoscope Instrument for checking existence and
direction of slow air currents.
ANEPVV Association Nationale d’Entraide et de
Prévoyance du Vol à Voile [gliding; office, F-75006 Paris]
(F).
anergolic Not spontaneously igniting; thus, most
rocket-propellant combinations comprising two or more
liquids. Opposite of hypergolic.
aneroid Thin-walled airtight compartment designed to
suffer precisely predictable and repeatable elastic distortion
proportional to pressure difference between
interior and exterior. Most are evacuated steel capsules in
form of disc with two corrugated faces which can
approach or recede from each other at centre. To increase
displacement a stack can be used linked at adjacent
centres. Common basis of pressure altimeter, ASI and
Machmeter.
aneroid altimeter Pressure altimeter; aneroid barometer
calibrated to read pressure altitude.
aneroid altitude Pressure altitude.
ANFCMA Associazione Nazionale Famille Caduti e
Mutilati dell’Aeronautica (I).
ANF Anti-navire futur (F).
ANG Air National Guard (US); B adds base.
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