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fitted to store hydraulic fluid under
pressure and dampen pressure fluctuations.
2. to make slightly wet
damper damper /dmpə/ noun a device to
decrease or reduce something
A yaw
damper is used for rudder control.
D & D D & D abbreviation distress and diversion
cell
danger area danger area /dend"ə eəriə/ noun
airspace of a particular length, width
and depth, within which at particular
times there may be activities which are
dangerous to the flight of the aircraft.
Abbreviation D, DA
danger zone danger zone /dend"ə zəυn/ noun
an area where danger exists
data data /detə/ noun 1. information
made up of numbers, characters and
symbols often stored on a computer in
such a way that it can be processed

Airspeed information is supplied from
an air data computer.  meteorological
data information about weather conditions
stored on a computer 2. information.

recorder
datum datum /detəm/ noun a reference or
base point of a scale or measurement,
e.g. mean sea level
datum shift trim system datum shift trim system /detəm
ʃft trm sstəm/ noun a trim system
which varies the incidence of an allmoving
tailplane without moving the
cockpit controls
In some aircraft, the
datum shift is operated automatically.
dBdB abbreviation decibel
DCDC abbreviation direct current
DCL DCL abbreviation departure clearance
de- de- /di/ prefix undo, remove or stop

deactivate
depressurise
deactivate deactivate /di|ktvet/ verb to
turn off a system or a piece of equipment
thus stopping it being ready to
operate
On some aircraft nose wheel
steering must be deactivated prior to
retraction.
dead reckoning dead reckoning /ded rekənŋ/,
ded reckoning noun navigation using
calculations based on airspeed, course,
heading, wind direction and speed,
ground speed, and time
In the early
stages of practical navigation, the student
pilot navigates by using dead reck-
65 deck
oning. Abbreviation DR (NOTE: The
term comes from ‘deduced’ reckoning
or ‘ded’ reckoning.)
de-aerate de-aerate /di eərəet/ verb to
remove gas, especially carbon dioxide
or air, from a liquid such as fuel
The
pump helps to de-aerate the fuel before
it enters the engine.
de-aeration de-aeration /di eə|reʃ(ə)n/ noun
the process of removing gas from a liquid
such as fuel
Partial de-aeration of
fuel takes place in the pump.
de-aerator de-aerator /di eə|retə/ noun a
device to remove gas from a liquid
de-aerator tray de-aerator tray /di eə|retə tre/
noun a device in the lubrication system
to remove air bubbles from oil
deal deal /dil/ noun  a great deal a large
amount of, a lot of
A great deal of
damage was done to the aircraft as a
result of the fire.  verb to handle or
manage
A computer can deal with the
constant inputs required to control an
unstable aircraft.
debris debris /debri/ noun scattered broken
pieces
Before running up the engine,
check that the aircraft is on firm ground
and that the area is free of stones and
other debris.
The aircraft exploded in
mid-air, spreading debris over a wide
area of the countryside.
decal decal /d|kl/ noun picture, letters or
digits printed on adhesive paper, which
is transferred onto a surface and may be
peeled away
A red decal with AVGAS
100LL in white letters indicates the type
of fuel to be used.
decelerate decelerate /di|seləret/ verb to slow
down
Reverse thrust and brakes help
to decelerate the aircraft after landing.
Opposite accelerate
deceleration deceleration /di|selə|reʃ(ə)n/
noun slowing down
Anti-skid braking
systems units are designed to prevent
the brakes locking the wheels during
landing, thus reducing the possibility of
wheel skid caused by the sudden deceleration
of the wheel. Opposite acceleration
decibel decibel /desbel/ noun a unit for
measuring the loudness of a sound.
Abbreviation dB
decimal decimal /desm(ə)l/ noun a decimal
fraction  adjective  decimal fraction
a fraction as expressed in the decimal
system
0.50 is a decimal fraction that
is equal to 1/2.  correct to three
places of decimal or to three decimal
　
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本文鏈接地址：Dictionary of Aviation上(61)