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drop drop /drɒp/ noun 1. a small amount of
liquid that falls a drop of water a few
drops of rain 2. a sudden lowering The
passage of a cold front is usually followed
by a drop in temperature. A
sudden drop in oil pressure is normally
an indication of serious engine trouble.
verb to become lower or to decrease
suddenly The temperature dropped by
several degrees.
droplet droplet /drɒplət/ noun a small drop
of liquid Experiments show that
smaller droplets of rain can remain
super cooled to much lower temperatures
than large droplets.
drove drove /drəυv/ drive
drum drum /dr m/ noun a cylindrical
device, often with closed ends
dry dry /dra/ adjective containing no
water or no moisture dry air lapse
rate
dry ice dry ice / dra as/ noun solidified carbon
dioxide
dual dual /djuəl/ adjective double, in pair
Most light aircraft with side-by-side
seating have dual controls.
duct duct /d kt/ noun a channel or tube
through which fluids or cables can pass
The modern jet engine is basically a
duct into which the necessary parts are
fitted.
due due /dju/ adjective 1. expected to
arrive the flight is due at 10 o’clock
the flight should arrive at 10 o’clock 2.
due to because of Due to daytime
heating, the stability decreases and the
wind speed increases. adverb exactly
and directly The aircraft flew due
east.
dump dump /d mp/ verb to offload quickly
Normal operating cabin pressure can
be reduced rapidly in the event of emergency
landings, by dumping air. The
aircraft flew out to sea in order to dump
fuel before landing.
duplication duplication / djupl|keʃ(ə)n/ noun
the act of copying or doubling Control
surfaces are divided into sections operated
by a separate control unit, thus
providing duplication to guard against
failure of a unit.
durability durability / djυərə|blti/ noun the
ability of a substance or device to last a
long time High quality components
have good durability.
duration duration /djυ|reʃ(ə)n/ noun the
length of time for which something
continues The duration of the examination
is two hours. The duration of
the flight was three hours.
dust dust /d st/ noun a fine powdery substance
blown by the wind and found on
surfaces Solid particles in the air
include dust, sand, volcanic ash and
atmospheric pollution.
duty duty /djuti/ noun 1. a period of work
on duty at work off duty not at
work 2. same as import duty the duty
payable on a carton of cigarettes
dye dye /da/ noun a material used to
change the colour of something
Minute surface cracks which are difficult
to detect by visual means may be
highlighted by using penetrant dyes.
dynamic dynamic /da|nmk/ adjective
referring to something in motion
dynamic pressure pressure created by
the forward movement of the aircraft
If the dynamic pressure increases due to
an increase in forward speed, the force
required to move the control column
will increase. Opposite static pressure
dynamic seal dynamic seal /da| nmk sil/
noun a seal which is part of a moving
component, e.g. in a hydraulic system
dynamic seals require lubrication to
remain effective
DZDZ / di zed/ abbreviation drizzle
E
EE abbreviation east
ear ear /ə/ noun the hearing organ
ear defenders ear defenders /ə d| fendəz/ plural
noun same as acoustic ear muffs
eardrum eardrum /ədr m/ noun a membrane
inside the ear which vibrates with sound
and passes the vibrations to the inner
ear Equalisation of the air pressure
across the eardrum is more difficult to
achieve during descents than ascents.
ear muffs ear muffs /ə m fs/ plural noun
acoustic ear muffs
ear protectors ear protectors /ə prə| tektəz/ plural
noun same as acoustic ear muffs
earth earth /%θ/ noun 1. (the planet)
Earth the planet where we live 2.
ground or soil verb to connect an electrical
appliance to a position of zero
potential When refuelling a light aircraft,
ensure that the aircraft is properly
earthed. (NOTE: The US expression is
to ground.)
east east /ist/ noun 1. a compass point on
the mariner’s compass 90° clockwise
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Dictionary of Aviation上(74)
