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accumulate  ice accretes on the rotor
ice builds up on the rotor
accretion accretion /ə|kriʃ(ə)n/ noun increase
or accumulation by slow external addition

Ice accretion can cause loss of lift
and significantly increase the weight of
the aircraft.
accumulate accumulate /ə|kjumjυlet/ verb to
collect and increase
Due to katabatic
effects, cold air flows downwards and
accumulates over low ground.
accumulation accumulation /ə|kjumjυ|leʃ(ə)n/
noun the collection and increase of
something
Fire in a toilet could
present difficulties due to the confined
space and possible smoke accumulation.
accumulator accumulator /ə|kjumjυletə/ noun
1. a device for storing energy in hydraulic
systems
An accumulator is fitted to
store hydraulic fluid. 2. an electric circuit
in a calculator or computer, in
which the results of arithmetical and
logical operations are formed
accuracy accuracy /kjυrəsi/ noun 1. the
state of being correct  to check for
accuracy to make certain that the result
is correct 2. the ability to find, hit or
show things correctly
The accuracy of
modern navigational equipment is
much greater than older systems.
accurate accurate /kjυrət/ adjective 1. correct

Skill in accurate flying can only
be achieved by practice.  accurate
results results which are exactly correct
2. precise
This watch is very accurate.
ACFT ACFT abbreviation aircraft
achieve achieve /ə|tʃiv/ verb 1. to manage to
do something demanding
In order to
achieve a safe landing in a crosswind,
the correct techniques must be used. 2.
to obtain
In wind shear conditions, a
fly-by-wire system allows the pilot to
achieve maximum lift by pulling hard
back on the stick without risk of a stall.
achievement achievement /ə|tʃivmənt/ noun
something difficult that somebody succeeds
in doing and feels proud about

For most trainee pilots, making their
first solo flight is a great achievement.
acid acid /sd/ noun a chemical substance
which reacts with a base to form
a salt
sulphuric acid (H2SO4) (NOTE:
An acid turns a litmus indicator red and
has a sour taste.)
acidity acidity /ə|sdti/ noun having an acid
content  the acidity of a substance the
amount of acid in a substance
acid-proof acid-proof /sd pruf/ adjective
able to resist the harmful effects of an
acid
acid test acid test /sd test/ noun a difficult
or exacting test of worth or quality
A
pilot’s ability to react appropriately in
an emergency situation is the acid test
of his or her professionalism.
ACMS ACMS noun a computer which records
information from various aircraft systems
during flight. Full form aircraft
condition monitoring system
ACN ACN abbreviation aircraft classification
number
acoustic acoustic /ə|kustk/ adjective referring
to sound
acoustic ear muffs acoustic ear muffs /ə|kustk ə
mfs/ plural noun coverings to protect
the ears from loud noise. Also called
ear protectors, ear defenders
acquire acquire /ə|kwaə/ verb to buy or otherwise
obtain
to acquire a new air-
5 adapt
craft
Speed control is used to acquire
and maintain a selected airspeed.
acquisition acquisition /kw|zʃ(ə)n/ noun
the act of buying or otherwise obtaining

Each computer checks data acquisition.

The image of the airline
improved after the acquisition of the
new aircraft.
acronym acronym /krənm/ noun a word
which is made up of the initial letters of
a name, and is pronounced as a word

NASA is the acronym for National Aeronautics
and Space Administration.

VASI is the acronym for visual
approach slope indicator.
act act /kt/ verb 1. to behave in a particular
way
The crew must act with
authority. 2. to take the role of
Mountain
ranges act as a barrier.
The governor
spill valve also acts as a safety
relief valve. 3.  to act on to produce an
effect
Bending and twisting forces act
on a propeller.
Gravity acts vertically
downwards.
acting acting /ktŋ/ adjective temporarily
taking on the responsibilities of somebody

Captain Smith will be acting
Chief Flying Instructor while Captain
White is absent from work.
action action /kʃən/ noun 1. something
　
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