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concrete, etc., outside a hangar for
parking aircraft (NOTE: The US term is
ramp.)
APRX APRX abbreviation (ICAO) 1. approximate
2. approximately
APU 22
APU APU abbreviation auxiliary power unit
aquaplaning aquaplaning /kwəplenŋ/ noun
sliding in an uncontrolled way over a
thin layer of water on the runway

Aquaplaning is caused by a layer of
water between the tyre and the runway.
arbitrary arbitrary /ɑbtrəri/ adjective
decided by chance rather than by careful
logical thought, happening without
planning or at random
The statute
mile is an arbitrary unit of measurement.
(NOTE: The nautical mile is not an
arbitrary unit: it is based on calculations
which have a wider use. See arc.)
arc arc /ɑk/ noun part of the circumference
of a circle
A nautical mile is the
length of an arc on the Earth’s surface
subtended by an angle of one minute at
the centre of the Earth.  verb to jump
across a gap
The spark arcs from one
electrode to another.
The condenser
prevents spark plugs from arcing.
gap
Arctic Arctic /ɑktk/ adjective referring to
the area around the North Pole  cold
Arctic air cold air from the Arctic  the
Arctic Circle a parallel running round
the Earth at latitude 66°32N, to the
north of which lies the Arctic region 
noun  the Arctic the area of the
Earth’s surface around the North Pole,
north of the Arctic Circle
The aircraft
flew over the Arctic.
area area /eəriə/ noun 1. a defined part of
a surface 2. a region  area forecasts a
weather forecast for a region rather
than, e.g., an aerodrome
area control service area control service /eəriə kən|
trəυl s%vs/ noun a unit that provides
air traffic control services to flights
within the area for which it is responsible
area navigation area navigation /eəriə nv|
$eʃ(ə)n/ a method of navigation that
permits aircraft to operate on any
desired flight path within the area covered
by ground-based navigational aids,
self-contained navigational aids or a
combination of the two. Abbreviation
RNAV
argument argument /ɑ$jυmənt/ noun 1. a
factor
QNH is the pressure at station
level reduced to sea level using arguments
of station height and an international
standard atmosphere. 2. a verbal
disagreement  to have an argument to
disagree openly and verbally with
somebody
The investigation revealed
that there had been an argument
between the commander and the copilot
about the advisability of continuing
with the final approach to land. 3. a reason

One of the arguments in favour of
building the new terminal is the
increase in opportunities of employment
for the local residents.
arid arid /rd/ adjective very dry  arid
terrain desert  an arid, sub-tropical
climate a hot, dry climate
arise arise /ə|raz/ verb to come into being,
to happen, to show up or to appear

Should any problems arise, report back
to me immediately. (NOTE: arising –
arose – arisen)
arm arm /ɑm/ noun 1. a device similar in
function to a human arm, operating as a
lever 2. the horizontal distance from a
reference point to the centre of gravity

The principle of the arm is used in
weight and balance calculations for an
aircraft.  verb to make ready for action
or use
Door-mounted escape slides
are armed before flight.
armature armature /ɑmətʃə/ noun the rotating
coils of an electric motor or dynamo

Secondary windings are wound over
the primary windings and the whole
assembly is known as an armature.
ARR ARR abbreviation arrival
arrange arrange /ə|rend"/ verb 1. to organise,
to plan and prepare
to arrange a
meeting 2. to put in special position

Charts should be numbered and
arranged in order of use.
A series of
dipoles are arranged in a circle.
arrangement arrangement /ə|rend"mənt/ noun
1. a plan
The arrangements for the
VIPs are being handled by the public
relations department. 2. the relative
positions of a number of different parts

The diagram shows a simple arrangement
of pistons, cylinders and pipes.
array array /ə|re/ noun an arrangement of
antennas
The localiser antenna array
is very wide.
arrest arrest /ə|rest/ verb 1. to stop or to prevent
　
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