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attitude of an aircraft to pull out of or
from a dive to return the aircraft to
level flight after a nose-down flight path
During manoeuvring of an aircraft,
when banking, turning and pulling out
from a dive, stresses on the airframe are
increased. verb to put the aircraft into
a steep nose-down attitude The aircraft
dived to avoid the other aircraft.
(NOTE: diving – dived)
diverge diverge /da|v%d"/ verb to move further
apart from something else Air
diverges at low levels and converges at
high levels, causing a sinking or subsiding
effect in the atmosphere. Opposite
converge
divergence divergence /da|v%d"əns/ noun the
act of moving apart Divergence of air
at high levels leads to rising air at low
levels with a consequent pressure fall.
Opposite convergence
divergent divergent /da|v%d"ənt/ adjective
referring to something which moves
further apart from something else
divergent duct divergent duct /da|v%d"ənt d kt/
noun a duct which has an inlet area
which is smaller than the outlet area
diversion diversion /da|v%ʃ(ə)n/ noun a
change in route or destination caused by
bad weather, technical problem, etc.
The aircraft had to make a diversion to
another airport due to fog.
divert divert /da|v%t/ verb to turn away
from a course or a destination An
automatic cut-out valve is fitted to
divert pump output to the reservoir
when pressure has built up to normal
operating pressure. The aircraft was
diverted to Manchester airport because
of fog.
divide divide /d|vad/ verb 1. to separate
into parts Air masses are divided into
two types according to source region
and these are known as polar and tropical
air masses. 2. to calculate how
many times a number is contained in
another number Eight divided by four
equals two (8 ÷ 4 = 2).
division division /d|v"(ə)n/ noun 1. separation
into parts the division of the
lower atmosphere the separation of the
atmosphere into its component layers 2.
the calculation of how may times a
number is contained in another number
The division sign is ÷.
DME DME abbreviation distance measuring
equipment
document document /dɒkjυmənt/ noun a
piece of writing, e.g. a memo, letter or
report The flight crew route flight plan
is a composite document which also
serves as a navigation log.
documentation documentation / dɒkjυmen|
teʃ(ə)n/ noun a collection of letters,
memos, reports, etc. Flight crews are
provided with a full meteorological
briefing, backed by documentation, a
short time before ETD.
domestic domestic /də|mestk/ adjective
referring or belonging to inside a country
Domestic flights usually leave
from Terminal 1.
dominant dominant /dɒmnənt/ adjective
main or most influential Both pressure
and temperature decrease with
height but the pressure change is the
dominant one and so, as pressure
decreases with height, so does density.
dominate dominate /dɒmnet/ verb to have
the most effect or influence on
Because the chart time and the departure/
arrival times differ, it is necessary
to consider the movement of any
weather system which will dominate the
route.
Doppler radar Doppler radar /dɒplə redɑ/ noun
radar which can distinguish between
fixed and moving targets or provide
ground speed and track information
from an airborne installation
Doppler VOR Doppler VOR / dɒplə vi əυ ɑ/
noun an adaptation of VOR to reduce
errors caused by location
dot dot /dɒt/ noun a small circular mark on
paper The highest point in a locality is
marked by a dot with the elevation
marked alongside.
downdraught downdraught /daυndrɑft/ noun 1.
cool air which flows downwards as a
rainstorm approaches. Opposite
updraught 2. air which flows rapidly
down the lee side of a building, mountain,
etc. (NOTE: It is also written downdraft
in US English.)
77 drive
downstream downstream / daυn|strim/ adverb
in the direction of flow, or further along
the line of flow Internally driven
superchargers are generally used on
medium and high powered engines and
are fitted downstream of the throttle
valve.
downward downward /daυnwəd/ adjective
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Dictionary of Aviation上(72)
