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EFIS is a highly sophisticated type of
flight director system. 2. a person who
is a member of the board that controls
the activities of a company
managing
director
disadvantage disadvantage /dsəd|vɑntd"/
noun an unwanted situation or condition,
or a factor which makes somebody
or something less likely to succeed

The disadvantage of a booster pump is
that the output is constant so that when
engine demand is high, fuel pressure
73 dispense
tends to be low and vice versa. Opposite
advantage
disadvantaged /dsəd|vɑntd"d/
adjective  physically disadvantaged
(person) a person who has a physical
disability
COMMENT: The word ‘disadvantaged’
may be regarded by some people as a
politically correct term for ‘disabled’.
With the help of specially-adapted
controls, more and more disabled
people are learning to fly.
disappear /dsə|pə/ verb 1. to vanish

If air blew at right angles to isobars,
the horizontal pressure differences
would eventually disappear. 2. to
pass out of sight
The aircraft took off,
climbed out and soon disappeared from
view.
disarm disarm /ds|ɑm/ verb 1. to switch off
an active or live system
On the ground
approaching the terminal, the flight
deck will instruct the cabin crew to disarm
the escape devices. 2. to forcibly
remove a weapon from somebody
The
hijacker was disarmed by security
forces.
disc disc /dsk/ noun a circular flat plate

A turbine consists of a disc on which is
mounted a number of blades.
discharge discharge /ds|tʃɑd"/ noun a
release of power from a source such as
a battery
A lightning flash is a largescale
example of an electrical spark, or
discharge.  battery discharge the loss
or release of electrical supply from a
battery  verb to release electrical supply
from a source such as a battery

The battery discharged overnight.
disconnect /dskə|nekt/ verb to
separate two things attached to one
another
The electrical supply can be
disconnected by pulling out the plug.
discrimination /d|skrm|
neʃ(ə)n/ noun the ability to know or
see the difference between two similar
things
Targets on the same bearing
which are separated radially by less
than half a pulse length distance will
appear at the receiver as one echo, so
good target discrimination requires
short pulses.
discuss discuss /d|sks/ verb to write about
or talk about a subject
This chapter
will discuss HF and VHF voice communications.
disembark disembark /dsm|bɑk/ verb to
leave the aircraft after landing
The
passengers finally disembarked at
20.00 hours.
disembarkation disembarkation /dsmbɑ|
keʃ(ə)n/ noun the act of leaving the
aircraft after landing
The exits are
used as conventional doors for disembarkation.
disengage disengage /dsn|$ed"/ verb to
switch off a system or device
Switches
on the control columns instantly disengage
the autopilot when depressed.
dish dish /dʃ/ noun a shallow container for
food
dish antenna dish antenna /dʃ n|tenə/ noun a
circular antenna with a shape like a
shallow bowl
disintegration disintegration /ds|nt|$reʃ(ə)n/
noun the falling apart or destruction of
something
Electromagnetic radiations
resulting from the disintegration
of radioactive materials are known as
gamma rays.
dismantle dismantle /ds|mnt(ə)l/ verb to
take apart into single components
One
type of inspection is able to reveal
fatigue cracks, corrosion, internal damage,
the presence of loose articles and
mercury spillage without the need to
dismantle the aircraft. Opposite
assemble (NOTE: The verb ‘mantle’ is
not used.)
disorientation disorientation /dsɔriən|teʃ(ə)n/
noun a state of confusion in which there
is loss of understanding of where one is
or which direction one is facing, etc.

When the cabin is rapidly and completely
filled by smoke and fumes passengers
will suffer from disorientation.
dispensation dispensation /dspen|seʃ(ə)n/
noun permission not to have to do
something
At very high altitudes the
　
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