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A-NPR, ANPRM
Commerciale (Rome); other Italian associations include
ANPAV (Assistenti di Volo), ANPCAT (Professionale
Controllori & Assistenti Traffico Aereo), ANPI
(Paracadutisti d’Italia), ANPIC (Piloti Istruttori Civili),
ANPiCo (Piloti Collaudatori), and ANPSAM (Piloti
Servizi Aerei Minori; also API).
A-NPR, ANPRM Advance notice of proposed rulemaking
(FAA).
ANR 1 Air Navigation Regulation.
2 Active [or acoustic] noise reduction.
ANRA Association Nationale des Résistants de l’Air;
résistant, a tough hard worker; [office F-75996 Paris] (F).
ANRS Automatic navigation relay station.
ANRT Association Nationale de la Recherche
Technique (F).
ANS 1 Air Navigation School.
2 Airborne [or air, or area] navigation system.
3 Artificial neural system.
4 Ambient-noise sensor.
5 Answer.
ANSA Advisory group, air navigation services (G).
Anser Autonomous navigation sensing experimental
research.
ANSI 1 American National Standards Institution, vital
for software.
2 Air navigation services institute [CAA] (Finland).
Ansir Awareness of national security issues and
responses (FBI, US).
ANSP Air navigation service provider.
AN 2 AN-squared, a fundamental gas-turbine parameter
in which A is total cross-section area of the gas path
through the rotor blades and N is ppm.
ANSV Agenzia Nazionale per la Sicurezza del Volo
[accident investigation authority] (I).
Ansyn Analysis by synthesis.
ANT 1 Autonomous negotiation [or negotiating] team.
2 Air-navigation trainer (simulator).
3 Antrieb [powerplant] neuer Technologie (G).
ant Antenna.
ANTAC Association des Navigants Techniciens de
l’Aviation Civile (Belg.).
Antares Antenna advanced intertial reference for
enhanced sensors.
ANTC Advanced Networking Test Center (US).
antenna US term for aerial (2), portions of broadcasting
EM system used for radiating or receiving radiation.
Plural antennas, not antennae.
antenna azimuth rate Rotational speed, rpm or rad/s.
anthophyllite Crystalline mineral, essentially (Mg, Fe)
Si O 3 .
anti-aircraft, AA Surface-based defence against aerial
attack. Suggested historic word; better to introduce SA,
surface-to-air, as prefix for guns as well as missiles,
together with associated radars and other peripherals.
anti-aircraft artillery, AAA Guns and unguided-rocket
projectors dedicated to surface-to-air use with calibre
12.7 mm (0.5 in) or greater.
anti-air warfare, AAW All operations intended to
diminish or thwart hostile air power, eg air defence and
interdiction against enemy airfields.
anti-aliasing filter Inserted in ouput of analog-to-digital
converter to screen out multiples of the digital sampling
frequency.
anti-freeze
anti-balance Opposing, counteracting or reducing
balance, esp. in dynamic system.
anti-balance tab Tab on control surface mechanically
constrained to deflect in same sense as parent surface to
increase surface hinge-moment (ie, to make it more difficult
to move in airstream); opposite of servo tab.
anti-ballistic missile, ABM System designed to intercept
and destroy hypersonic ballistic missiles, esp. RVs of
ICBMs. Speed of such targets, smaller radar crosssection,
possible numbers, use of ECM and decoys,
nuclear blanketing of large volumes of sky, ability to
change trajectory, enormous distances, and need for 100%
interception, make ABM difficult.
anti-blocking system Prevents aircraft from making
simultaneous or conflicting radio transmissions.
anti-buffet Describes measures adopted on atmospheric
vehicles, esp. high-speed aircraft, to reduce or eliminate
aerodynamic buffet. Almost always auxiliary or locally
hinged surface moved out into airflow to reduce buffet
which would otherwise be caused by configuration
change, eg opening weapon-bay doors. Thus * flap, panel,
comb, rake, slot.
anticer Device or material intended to prevent ice from
forming. See anti-icing.
anticing See anti-icing.
anti-clutter Any of many techniques intended to reduce
clutter.
anti-collision beacon High-intensity [so-called strobe]
flashing red light[s] carried by most aircraft, to be visible
at great distance from any aspect.
anti-coning In most helicopters, and some other rotorcraft,
** device fitted to prevent main rotor blades from
reaching excessive coning angle (being blown upwards, eg
by high wind at zero or low rotor rpm on ground), from
which they could fall and exceed root design stress when
suddenly arrested. Usually fixed range of angular coning
permissible between ** device and droop stop.
anti-corrosion Measures taken depend on environment
(see marinising), and working stress and temperature of
hardware; apart from choice of material and surface
coating (Alclad, anodising, painting with epoxy-based
paint, etc), special agents can be introduced to fuels, lubricants,
seals, hydraulic fluids and interior of stored device
(inhibiting).
anti-cyclone, anticyclone Atmospheric motion contrary
to Earth’s rotation. Large area of high pressure, generally
with quiet, fine weather, with general circulation
clockwise in N hemisphere and anticlockwise in S; divided
into ‘cold’ and ‘warm’ each group being subdivided into
‘permanent’ and ‘temporary’.
anti-dazzle panel 1 Rearwards extension around top of
instrument panel or cockpit coaming to improve instrument
visibility and at night prevent reflection of
instruments from windscreen.
2 On aircraft with natural metal finish, areas of exterior
painted with non-reflective black or dark blue to prevent
bright reflections being visible to crew.
anti-drag wire Structural bracing filament, usually
incorporated within wing, intended to resist forwards
(‘anti-drag’) forces, usually from trailing edge at root to
leading edge at tip.
anti-freeze Most important agent ethylene glycol
(CH 2 OH.CH 2 OH), usually used as aqueous solution with
minor additives. Neat ‘glycol’ (there are many) remains
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