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flying pilot must be on oxygen at all
times, unless an aircraft dispensation
has been obtained.
dispense dispense /d|spens/, dispense with
verb not to include or not to use something

In some cases the rivets are dis-
dispersal 74
pensed with and the skin is fixed to the
internal members by the redux process.
dispersal dispersal /d|sp%s(ə)l/ noun 1. the
act of leaving an area and going in different
directions  the dispersal of a
crowd the disappearance of a crowd 2.
the clearing away of something such as
mist, e.g. by the wind
the dispersal of
hill fog
Dispersal of cloud takes place
when surface heating lifts the cloud
base or drier air is advected.
disperse disperse /d|sp%s/ verb 1. to leave an
area going in different directions  the
crowd dispersed the people in the
crowd left the area, going in different
directions, so that eventually the crowd
disappeared 2. to clear away
The fluorescent
green dye will disperse slowly in
a calm sea but quickly in a moderate to
rough sea.
displace displace /ds|ples/ verb to move
something out of its normal position

The atmosphere is said to be stable if,
when a parcel of air is displaced vertically,
it tends to return to its original
level.
displacement displacement /ds|plesmənt/ noun
movement away from the normal position

The ILS is a cross-pointer indicator
which shows the aircraft horizontal
displacement from the localiser and
vertical displacement from the glide
path.
display display /d|sple/ noun 1. the appearance
of information on a monitor screen
or on the panel of an instrument or of an
indicator
There are three different
types of electronic display systems:
EFIS, EICAS and ECAM.  digital display
information shown as numbers

The clock uses a digital display to show
the time of 12:33. 2. a show or demonstration
 verb to show, e.g. on a panel
or a screen
Alerting and warning
information is displayed.
disseminate disseminate /d|semnet/ verb to
send out or spread
Meteorological
stations make routine weather observations
at fixed intervals and disseminate
this information locally.
dissimilar dissimilar /d|smlə/ adjective referring
to something which is not the same
as, or is unlike, something else
Differential
expansion switches operate on
the principle that the coefficients of
expansion of dissimilar metals are different.
dissipate /dspet/ verb to spread
out and lose power or strength, or to
cause something to do this
Tropical
storms often dissipate as they pass from
sea to land.
dissipation dissipation /ds|peʃ(ə)n/ noun the
process of spreading out and losing
power or strength
The rubber used on
nose or tail wheels is usually constructed
to form a good electrical conductor
for the safe dissipation of static
electricity.
dissolve dissolve /d|zɒlv/ verb to become or
to cause to become part of a liquid and
form a solution
Sugar dissolves in
water.
There is a possibility that in
some types of accumulator, gas may be
dissolved into the fluid and thus introduced
into the system.
dissolved /d|zɒlvd/ adjective that
has melted and become of a liquid 
dissolved water water in solution in
fuel
distance distance /dstəns/ noun a space
between two places or points, or the
measurement of such a space
The distance
from point A to point B is 100 nm.

The distance from point A to point B
on the diagram is 2 cm.
The height of
the aircraft is the vertical distance,
measured in feet, of the aircraft above
the surface of the Earth.
measuring equipment distance measuring equipment
/dstəns me"(ə)rŋ |kwpmənt/
noun an airborne secondary radar
whose signal is converted into distance

It is quite common to find a VOR
located together with DME (Distance
Measuring Equipment) to give simultaneous
range and bearing from the same
point on the ground. Abbreviation DME
COMMENT: DME equipment is usually
located in a VOR station. Other
equipment in the aircraft transmits a
signal to the VOR station, which
replies. The equipment in the aircraft
converts the signal into distance and
also calculates ground speed and the
　
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