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the northern hemisphere, the wind
blows anticlockwise round a depression
and clockwise round an anticyclone and
vice versa in the southern hemisphere.
deep depression area of very low relative
atmospheric pressure 2. a lower
area on a surface, which is often difficult
to see A depression on the wing
surface must be investigated in case it is
an indication of more serious structural
damage.
depressurisation depressurisation /di| preʃəra|
zeʃ(ə)n/, depressurization noun a
loss, especially sudden, of cabin pressure
Emergency oxygen must be available
in the event of depressurisation.
depressurise depressurise /di|preʃəraz/,
depressurize verb to lose pressure
suddenly, or to cause to lose pressure
The aircraft began to depressurise at
20,000 feet.
depth depth /depθ/ noun the distance from
the top surface of something to the bottom
The troposphere’s depth is variable
in temperate latitudes.
derive derive /d|rav/ verb to get or to obtain
Performance data is derived from
flight tests. Kepler derived the laws
which relate to the motion of planets in
their orbits.
69 detachable wheel spats
descend descend /d|send/ verb to lose altitude,
usually in a planned manoeuvre
the aircraft descended to 10,000 feet
the pilot reduced altitude until the aircraft
was at 10,000 feet. Opposite
climb, ascend
descent descent /d|sent/ noun a planned loss
of altitude The descent from cruise
altitude took 40 minutes. in the
descent during planned loss of altitude,
usually in preparation for landing
‘…a search of radar recordings showed
that a DC-10 had tracked within a few
hundred metres of the house while
passing 9,500 feet in the descent to
Gatwick’ [Pilot]
describe describe /d|skrab/ verb 1. to give
the particular features of something to
describe what happened put into
words exactly what happened 2. to draw
a geometric figure or to move in a line
that forms a geometric figure The definition
of a year is the time taken for a
planet to describe one orbit around the
sun. to describe an arc to draw or
move in an arc
description description /d|skrpʃən/ noun 1.
the act of giving the particular features
of something a detailed description of
world climate 2. the drawing or making
of a geometric figure the description
of a triangle the drawing of a triangle
desert desert /dezət/ noun a large area of
dry often sandy country Over desert
areas the lack of water vapour produces
cold nights.
design design /d|zan/ noun a plan or drawing
of something before it is made The
design and testing of aircraft are important
stages in the development programme.
verb to draw plans using
accurate information in preparation for
constructing something to design an
aircraft to have the idea, make drawings,
calculate data, etc., with the intention
of producing an aircraft
designate designate /dez$net/ verb to
choose for a special purpose This
region is designated as a fire zone.
designator designator /dez$netə/ noun a
group of letters and/or numbers that
identify something
designer designer /d|zanə/ noun a person
who has the idea for, and makes plans to
produce, something Rutan is a
designer of unusual-looking aircraft.
‘…test-pilot’s tip for a safe first flight –
take the designer with you’ [Flight
International 9–15 Oct. 1996]
desirable desirable /d|zaərəb(ə)l/ adjective
preferred or wanted Equalisation of
the air pressure across the eardrum is
more difficult to achieve during
descents than ascents, and a minimum
rate of pressure change is desirable.
despite despite /d|spat/ preposition in spite
of Many beacons and aids which are
provided for low operations are left out
to keep the chart clear – despite this, the
charts still look very difficult to understand.
despite the weather, we took
off although the weather was bad, we
took off
DEST DEST abbreviation destination
destination destination / dest|neʃ(ə)n/ noun
the place to which somebody or something
is going Aerodrome forecasts
are normally given in code form for
destination and alternates.
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Dictionary of Aviation上(65)
