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demand, a flight plan giving the optimum
route, levels and fuel. verb 1. to
require as a necessity Higher operating
weights of modern aircraft demand
an increase in the number of wheels fitted
to the landing gear. 2. to ask firmly
He demanded an explanation.
demonstrate demonstrate /demənstret/ verb to
show by clear example or explanation
Torricelli first demonstrated that the
atmosphere has weight. It will be
demonstrated in chapter 12 that turbulence
is associated with strong winds.
demonstration demonstration / demən|streʃ(ə)n/
noun a clear, often visual, description or
explanation Your instructor will give a
demonstration of the stall-recovery
technique.
dense dense /dens/ adjective 1. referring to
a substance which is closely compacted
dense fog thick fog 2. referring to the
amount of mass of a substance for a
given unit of volume Air which contains
water vapour is less dense than air
which does not.
density density /densti/ noun a quantity of
mass for a given unit of volume air
density
density altitude density altitude / densəti
lttjud/ noun the pressure altitude
corrected for non-ISA temperature
COMMENT: Density altitude is a very
important factor in calculating aircraft
performance because of its effect on
engine performance, time to reach
takeoff speed (and therefore length of
take-off run) and rate of climb.
density error 68
density error density error /densəti erə/ noun a
correction to airspeed to give true airspeed
DEP DEP abbreviation departure message
depart depart /d|pɑt/ verb to leave The
flight departs at 0200 GMT. Opposite
arrive
department department /d|pɑtmənt/ noun a
separate part of a complex whole, especially
of an organisation
departure departure /d|pɑtʃə/ noun 1. the act
of leaving departure time the time
when an aircraft becomes airborne 2.
the distance between two meridians at
any given latitude
departure lounge departure lounge /d|pɑtʃə
laυnd"/ noun a room at an airport
where passengers wait to board their
aircraft
departure point departure point /d|pɑtʃə pɔnt/
noun a place on the map representing
the place from which a flight begins
departures departures /d|pɑtʃəz/ noun the
part of an airport that deals with passengers
who are leaving
depend depend /d|pend/ verb 1. to be controlled
or affected entirely by something
Whether or not an object can be
seen by aircrew at a given distance will
depend on factors such as size, shape
and colour of the object. If an aircraft
ditches in the sea, early rescue depends
on rapid location of survivors. 2. to rely
on Pilots depend on air traffic controllers
to help them conduct a safe
flight.
dependable dependable /d|pendəb(ə)l/ adjective
reliable, trustworthy Mercury
barometers have largely been replaced
by precision aneroid barometers which
are smaller, simpler to use, and more
dependable.
dependent dependent /d|pendənt/ adjective
relying on or unable to do without
something The height indicated by an
altimeter is dependent on the pressure
which is set on the sub-scale.
deploy deploy /d|plɔ/ verb to come into
action, to become ready to be used
Slide rafts are door-mounted and automatically
deploy and inflate when the
door is opened in the armed position.
deposit deposit /d|pɒzt/ noun a layer of
collected matter on a surface A
deposit of ice crystals causes the aircraft
surfaces to change their aerodynamic
characteristics. Wheel brakes
should be inspected for snow or ice
deposits.
depreciate depreciate /d|priʃiet/ verb to
decrease in value The aircraft depreciated
by 100% over the 5 year period.
Opposite appreciate
depreciation depreciation /d| priʃi|eʃ(ə)n/
noun a decrease in value There was a
depreciation of 100% in the value of the
aircraft over the 5 year period. Opposite
appreciation
depress depress /d|pres/ verb to push down
Switches on the control columns
instantly disengage the autopilot when
depressed.
depression depression /d|preʃ(ə)n/ noun 1. an
area of low atmospheric pressure In
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Dictionary of Aviation上(64)
