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traffic radar service which gives pilots
details of the positions, distances and
levels of other aircraft to enable them to
decide on any avoiding action which
may be appropriate. Abbreviation RIS
(NOTE: An RIS is often provided when it
is not possible or practical to provide an
RAS.)
radar screen radar screen /redɑ skrin/ noun a
cathode ray tube screen on which radar
information is displayed
vectoring radar vectoring /redɑ vektərŋ/
noun the provision of navigational
guidance to aircraft in the form of specific
headings, based on the use of radar
radial radial /rediəl/ adjective referring to
lines of radius having a common centre
 radial engine engine in which the pistons
are arranged like the spokes of a
wheel  noun a line of radio bearing
from a VOR beacon
To get to a facility
you must track the reciprocal of the
VOR radial.
radiate radiate /rediet/ verb to send out
rays or waves
The Earth radiates low
intensity infrared waves.
Short bursts
of energy are radiated from an antenna.
radiation radiation /redi|eʃ(ə)n/ noun the act
or process of sending out rays or waves
 terrestrial radiation radiation from
the Earth
radiation fog radiation fog /redi|eʃ(ə)n fɒ$/
noun fog caused by the cooling of the
Earth to below the dew point, combined
with saturation and condensation and a
light mixing wind
Radiation fog cannot
form over the sea.
radiator radiator /redietə/ noun a liquid-toair
heat exchanger that transfers engine
heat to the outside air
Anti-icing additives
are used in radiator coolants.

coolant
radio radio /rediəυ/ noun wireless transmission
through space of electromagnetic
waves in the approximate frequency
range from 10 kHz to 300,000
MHz  radio waves electromagnetic
radiation waves
The atmosphere
absorbs radio waves.
radio aid radio aid /rediəυ ed/ noun a navigation
aid utilising radio waves
radio altimeter radio altimeter /rediəυ lt|
mitə/ noun a device for measuring the
height of the aircraft above the Earth
using reflected radio waves
radio horizon radio horizon /rediəυ hə|raz(ə)n/
noun a line along which direct rays
from a radio frequency transmitter
become tangential to the Earth’s surface
radio magnetic indicator radio magnetic indicator
/rediəυ m$|netk ndketə/ noun
radiotelephony 186
a cockpit navigation instrument which
combines a bearing indicator and a
heading indicator and can be used with
ADF or VOR. Abbreviation RMI
radiotelephony radiotelephony /rediəυtə|lefəni/
noun the transmission of speech by
radio
Correct use of R/T phraseology
avoids ambiguity. Abbreviation R/T
radius radius /rediəs/ noun  the radius of
a circle a line drawn from a point on the
circumference of a circle to the centre
point (NOTE: The plural form is radii.
/redia/)
radome radome /redəυm/ noun a dome that
protects a radar antenna, made from
materials that do not interfere with the
transmission and reception of radio
waves
RAF RAF abbreviation Royal Air Force
raft raft /rɑft/ noun a flat-bottomed inflatable
rubber craft for floating on water
railway line railway line /relwe lan/ noun a
railway track or train track
A railway
line is a useful landmark.
rain rain /ren/ noun precipitation or water
which falls from clouds in small drops

Rain is falling heavily.
Rain and
weather present fewer problems for
area radar compared to the other types.
 verb to fall as drops of water from
clouds
It is raining.
I don’t think it
will rain.
rainstorm rainstorm /renstɔm/ noun heavy
rain accompanied by wind
In heavy
rainstorm, the windscreen wipers may
not be able to cope.
raise raise /rez/ verb 1. to lift  raise the
landing gear retract the undercarriage
2. to increase
to raise the temperature

to raise the pressure 3. to cause problems

Fuel vaporisation can raise
problems when starting the engine.
(NOTE: Do not confuse with the verb to
rise. Grammatically, the verb raise
takes an object whereas the verb rise
　
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本文鏈接地址：Dictionary of Aviation下(48)