directional /da.rek..n(.)l/ adjec-tive referring to the course taken by somebody or something
directional gyro /da.rek.(.)n(.)l da.r.υ/ noun a gyroscopic instrument which indicates direction but does not have a north-seeking magnet . The directional gyro should be set to corre-spond with the magnetic compass. .
heading indicator directional radar beam /da. rek.(.)n(.)l re.dɑ bim/ noun a sig-nal from a directional beacon enabling the pilot to determine a bearing from the beacon with a communications receiver
direction indicator /da.rek..n
.nd.ke.t./ noun an instrument which gives direction information. Abbrevia-tion DI
directive /da.rekt.v/ adjective refer-
ring to the ability of a device to send or receive signals in straight lines . The antenna is highly directive in transmis-sion and reception. . noun general or detailed instructions from management to staff to guide them in their work .
According to the management directive, all late arrivals should be logged.
director /da.rekt./ noun 1. a device with a central controlling function .
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 /d.s.dvɑnt.d/
noun an unwanted situation or condi-tion, 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.s.dvɑnt.dd/
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.s.p../ verb 1. to van-ish . If air blew at right angles to iso-bars, the horizontal pressure differ-ences would eventually disappear. 2. to pass out of sight . The aircraft took off, climbed out and soon disappeared from view.
disarm /d.sɑm/ 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 dis-arm the escape devices. 2. to forcibly remove a weapon from somebody . The hijacker was disarmed by security forces.
disc /d.sk/ noun a circular flat plate .
A turbine consists of a disc on which is mounted a number of blades.
discharge /d.st.ɑd/ noun a
release of power from a source such as a battery . A lightning flash is a large-scale example of an electrical spark, or discharge. . battery discharge the loss or release of electrical supply from a battery . verb to release electrical sup-ply from a source such as a battery .
The battery discharged overnight.
disconnect /d.sk.nekt/ verb to
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