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ANLP
ANLP Arinc network layer protocol.
ANLS Automatic navigation launch station.
ANM AFTN notification message.
ANMI Air navigation multiple indicator.
ANMPG Air nautical miles per gallon.
ANMS 1 Aircraft navigation and management system.
2 Automatic navigation mission station (UAV).
3 Automated noise monitoring system.
ANN Applied neural network.
ann Annunciator.
annealing Heat treatment for pure metal and alloys to
obtain desired physical properties by altering crystalline
microstructure. Usually involves heating to above solidsolution
or critical temperatures, followed by gentle
cooling in air. General aim to make metal less brittle,
tougher, more ductile and relieve interior stress.
annotation Identifying and coding reconnaissance
ouputs, such as visual-light photographs, IR print-outs,
ECM records, etc, with digital data: date, time, place,
unit, altitude, flight speed, heading and data specific to
reconnaissance system.
annual Annual mandatory inspection of aircraft, or
renewal of C of A.
annual variation Amount by which magnetic variation
at specified place on Earth varies in calendar year. In UK
about –7'(min), reducing local variation to zero in year
2140.
annular combustion chamber In gas-turbine engine,
chamber [including flame tube(s) and liners] entirely in
form of body of revolution, usually about major axis of
engine.
annular gear Ring gear or annulus, gearwheel in which
teeth project inwards from outer periphery. In annulus
gear there is no centre, teeth being carried on open ring
(which in turboprop/turbofan reduction gears may be
resiliently mounted and torque-reacted by torquesignalling
system). When shaft-mounted, teeth usually on
one side only of flat or conical disc.
annular injector Rocket (or possibly other engine)
injector in which liquid fuel and/or oxidant is sprayed
from narrow annular orifice. In bipropellant engine
numerous such orifices spaced around chamber head,
alternately for fuel and oxidant.
annular radiator Cooling radiator shaped as body of
revolution to fit around axis of aircraft engine, esp.
between propeller and piston engine having circular cowl.
annular spring Has form of ring distorted radially under
load. Sometimes called ring spring, esp. when given
tapered cross-section and used in multiple, in an intermeshing
stack, to resist load along axis of symmetry.
annular wing Wing in form of body of revolution,
designed to operate in translational flight with axis of
symmetry almost horizontal.
annulus drag Most often refers to base drag of annular
periphery around propulsive jet nozzle which incompletely
fills base of vehicle, esp. ballistic rocket rising
through atmosphere.
annunciator 1 In gyrocompass (remote compass), indicator
flag visible through window of cockpit instrument;
with a.c. supply on and gyro synchronized with compass
detector, indication should hover between dot and cross,
never settle on either.
2 In aircraft system, esp. on aircraft having flight deck
ANPAC
rather than cockpit, panel or captioned warnings often
distributed on schematic diagram of system.
3 In a CDU, the alpha and numeric keys providing part
of the operator interface.
4 Subsystem of autopilot for auto or manual switching
between compass and directional gyro.
ANO Air Navigation Order, UK statutory instrument
for enactment of ICAO policy defining laws, licensing and
similar fundamental issues regarding aerial navigation
(see ANR).
anode In electrical circuit (electrolytic cell, valve, CRT),
positive pole, towards which electrons flow; that from
which “current” conventionally depicted as emanating.
anodic treatment See next.
anodising Electrolytic (electrochemical) treatment for
aluminium and alloys, magnesium and alloys and, rarely,
other metals, coated with inert surface film consisting
mainly of oxide(s) as protection against corrosion.
Electrolyte usually weak sulphuric or chromic acid.
ANOE Automated nap of the Earth.
anomalistic period Time between successive passages of
satellite through perigee.
anomalistic year Earth’s orbital period round Sun, perihelion
to perihelion: 365 d 6 h 13 m 53.2 s, increasing by
about 0.26 s per century.
anomalous dispersion Local reversal in rule that medium
transparent to EM radiation diffracts it with refractive
index that falls as wavelength increases; discontinuities in
absorption spectrum make index increase as wavelength
increases.
anomalous propagation Of wave motions, esp. EM radiation
of over 30 kHz frequency or sound, by route(s)
grossly different from expected, usually because of atmospheric
reflection and/or refraction, sharp humidity
gradients and temperature inversion.
anomaly 1 Difference between mean of measured values
of meteorological parameter at one place and mean of
similar values at all other points on same parallel (in practice,
mean of similar values at other stations near same
parallel).
2 In general, deviation of observed geodesic parameter
from norm or theoretical value.
3 Specif. local distortion of terrestrial magnetic field
caused by local concentrations of magnetic material used
in aerial geophysical surveys and ASW (see MAD).
Anoms Airport noise and operations monitoring
system.
ANORAA Association Nationale des Officiers de
Réserve de l’Armée de l’Air (F).
Anova Analysis of variance, especially in monitoring
flight-crew performance under different adverse or stress
conditions.
anoxaemia Hypoxaemia, deficiency in oxygen tension
(loosely, concentration) of blood.
anoxia Absence of oxygen available for physiological
use by the body (see hypoxia).
ANP 1 Aircraft nuclear propulsion; general subject and
defunct DoD programme.
2 Air navigation plan (ICAO).
3 Actual [or achieved] navigation performance.
ANPA 1 Aircraft Nuisance Prevention Association (J).
2 Advanced notice of proposed amendment.
3 See APA (13).
ANPAC Association Nazionale Piloti Aviazione
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