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depressing the valve.
deflect deflect /d|flekt/ verb 1. to cause an
object to move away from a neutral or
central position During an out-of-balance
turn, the ball in the slip indicator
will be deflected to the left or right. 2. to
move a moving object, gas or liquid
away from its intended path In an
open-cockpit aircraft, the windshield
deflects the airflow over the pilot’s
head.
deflection deflection /d|flekʃ(ə)n/ noun 1.
movement away from a central or neutral
position Full deflection of the
ailerons is sometimes needed on takeoff
to counteract a crosswind. 2. the
movement of a moving object, gas or
liquid away from its intended path In
the southern hemisphere the deflection
of wind at the equator is to the left.
deformation deformation / difɔ|meʃ(ə)n/
noun a change of the correct shape
caused by stress Deformation of wing
panels may be an indication of serious
structural damage.
deg deg abbreviation degree
degradation degradation / de$rə|deʃ(ə)n/ noun
a decrease in quality Degradation of
the radio signal sometimes makes it
impossible to understand the message.
degrade degrade /d|$red/ verb to decrease
the quality of something Interfering
signals degrade VOR performance.
degree degree /d|$ri/ noun 1. a level,
amount or quantity the degree of
compression the amount of compression
a high degree of safety a high
level of safety to a greater degree
more than to a lesser degree less than
2. a unit of temperature twenty
degrees Celsius (20°C) twenty
degrees Centigrade (20°C) seventy
67 density altitude
degrees Fahrenheit (70°F) 3. a unit of
measurement of an angle equal to
1/360th of a circle – each degree is
divided into 60 minutes and each minutes
into 60 seconds Make a turn to
the right at a bank angle of 30°. an
angle of 90° a right angle 4. a unit of
direction as measured on a compass
east = 090° west = 270°
degrees true degrees true /d| $riz tru/ noun
degrees of direction measured from true
north, not magnetic north. Also called
true degrees. Symbol °T
dehydration dehydration / diha|dreʃ(ə)n/
noun an unwanted and sometimes dangerous
loss of water from the body
Dehydration can be avoided by drinking
plenty of water.
de-ice de-ice / di as/ verb to remove ice
The ground crew de-iced the aircraft
prior to take-off.
de-icer de-icer / di asə/ noun a device or
substance used to remove ice De-icer
spray should be checked to make sure it
is not harmful to light aircraft windscreens.
de-icing de-icing / di asŋ/ noun the
removal of ice adjective referring to
the removal of ice de-icing fluid
anti-icing, icing
delay delay /d|le/ noun a period after the
expected time that you have to wait
before something happens, the length of
time by which something is late By
day, the presence of cloud can cause a
delay in clearance of fog. verb 1. to
make late, to cause to be late Take-off
was delayed because of fog. 2. to put
something off until later He delayed
telling her the news until they had
landed.
delayed-action delayed-action /d| led kʃən/
adjective in which there is an unusual
passing of time between stimulus and
response The door is fitted with a
delayed-action lock which operates one
minute after the power has been
switched off.
deliver deliver /d|lvə/ verb to provide, to
give The motor will continue to run
but will deliver only one-third the rated
power. The pump can deliver fuel at
the rate of 2,000 gph.
delivery delivery /d|lv(ə)ri/ noun the act of
providing or giving On some pumps, a
depressurising valve is used to block
delivery to the system.
delivery pressure delivery pressure /d|lv(ə)ri
preʃə/ noun the pressure normally
expected when fuel is being pumped
deluge deluge /deljud"/ noun fire deluge
system
demand demand /d|mɑnd/ noun 1. a need or
use caused by necessity high current
demand on a generator a situation
requiring the generator to produce a lot
of electricity 2. a request which is made
firmly on demand when asked for or
ordered A computer will produce, on
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Dictionary of Aviation上(63)
