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time needed to reach the station.
75 diurnal
distillation distillation /dst|leʃ(ə)n/ noun the
process by which a liquid is heated and
the resulting vapour is then condensed
and collected
With kerosene-type
fuels, the volatility is controlled by distillation.
distinct distinct /d|stŋkt/ adjective clear
and easily seen or understood
When a
lead-acid battery is fully charged, each
cell displays three distinct indications.
distinction distinction /d|stŋkʃən/ noun
something which makes one thing different
from another
A clear distinction
is made between showers and general
precipitation.
distinctive distinctive /d|stŋktv/ adjective
easily recognised because of particular
features or characteristics
Concorde is
a very distinctive-looking aeroplane.
distinguish distinguish /d|stŋ$wʃ/ verb to
know or to see the difference between
things
A receiver antenna would be
unable to distinguish between signals
unless they had some differing characteristics.
distinguishable distinguishable /d|
stŋ$wʃəb(ə)l/ adjective easily recognised
as different from
Useful
ground features must be easily distinguishable
from their surroundings.
distort distort /d|stɔt/ verb 1. to put out of
shape
Stress could cause the body of
the aircraft to distort or change its
shape. 2. to produce a bad radio signal

The sound of the transmission is distorted
if the volume is set too high.
distortion distortion /d|stɔʃ(ə)n/ noun 1. the
bending or twisting of something so
that it is out of shape
Difficulty in
closing a door may be caused by distortion
of the airframe. 2. alteration of the
electrical signal that makes a transmission
unclear
Distortion of the signal
made it difficult for the controller to
understand what the pilot said.
distress distress /d|stres/ noun 1. serious
danger or difficulty 2. a personal worry
or anxiety
Some passengers were in
distress after the incident.
distress and diversion cell distress and diversion cell /d|
stres ənd da|v%"(ə)n sel/ noun a
unit at an air traffic control centre that
provides immediate assistance to aircraft
in difficulty
distress signal distress signal /d|stres s$n(ə)l/
noun a signal transmitted by an aircraft
in danger
distribute distribute /d|strbjut/ verb 1. to
give or send out
There are two basic
configurations which are used to distribute
electrical power, the parallel
system and the split bus system. 2. to
spread over a wide area
Multiple
wheel undercarriage units distribute
the weight of the aircraft.
distribution distribution /dstr|bjuʃ(ə)n/ noun
1. the act of giving or sending out
Parallel
AC and DC power distribution systems
are found on commercial aircraft
containing three or more engines. 2. the
fact of being spread over an area

There is a high distribution of used and
disused airfields in the south of England.
distributor distributor /d|strbjυtə/ noun a
device which sends an electrical charge
to each spark plug in turn
The distributor
directs the high voltage impulses to
the cylinders in turn as they reach their
ignition point.
disturb disturb /d|st%b/ verb to upset the
normal condition of something
Small
hills can disturb the flow of air.
disturbance disturbance /d|st%bəns/ noun
something that upsets the normal condition
of something
In general, the
higher the mountain and the faster the
air flow the greater is the resulting disturbance.
ditch ditch /dtʃ/ verb to land a plane in the
sea, in an emergency
Even though aircraft
have ditched successfully, lives
have been lost because life rafts were
not launched in time.
ditching ditching /dtʃŋ/ noun the act of
landing a plane in the sea, in an emergency

After all four engines stopped,
the captain had to seriously consider
the possibility of a ditching in the
Indian Ocean.
diurnal diurnal /da|%n(ə)l/ adjective referring
to the 24-hour cycle of day and
night
Diurnal changes in surface temperature
over the sea are small.
dive 76
dive dive /dav/ noun a steep nose-down
　
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