radio magnetic indicator
/re.di.υ mnet.k .nd.ke.t./ 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 /re.di.υt.lef.ni/
noun the transmission of speech by radio . Correct use of R/T phraseology avoids ambiguity. Abbreviation R/T
radius /re.di.s/ 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 /re.d.υm/ noun a dome that protects a radar antenna, made from materials that do not interfere with the transmission and reception of radio waves
RAF abbreviation Royal Air Force raft /rɑft/ noun a flat-bottomed inflat-able rubber craft for floating on water
railway line /re.lwe. la.n/ noun a
railway track or train track . A railway line is a useful landmark.
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 /re.nst.m/ noun heavy rain accompanied by wind . In heavy rainstorm, the windscreen wipers may not be able to cope.
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 prob-lems . 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 does not: temperature rises; The sun’s rays raise the temperature of the sur-face.)
rake /re.k/ noun the angle between a wing or propeller blade of an aircraft and a perpendicular or line of symmetry
ram /rm/ noun an increase in air pressure caused by the forward speed of
the aircraft . Due to ram effect from air-craft forward speed, extra air is taken into the engine.
ram air /rm e./ noun airflow cre-ated by the movement of the aircraft which is used to cool, ventilate or drive turbines . Oil cooling is often achieved by using ram air or fuel.
ramjet /rmdet/ noun a type of jet engine in which fuel is burned in a duct with air compressed by the forward motion of the aircraft
ramp /rmp/ noun 1. an inclined track for loading and unloading . The height of the cabin floor to the ground on large jet transports means that injuries can occur by exiting through the doors when steps or ramps are not available.
2. US same as apron range /re.nd/ noun 1. the amount or extent of variation . range of frequen-cies . range of temperatures 2. a row or chain of mountains or hills . the Rocky Mountain range . Valley winds require at least a reasonable pressure gradient, preferably along a range of hills which will produce a wind at right angles to the hills. 3. the maximum distance an aircraft can fly on a given amount of fuel . Cruise level is selected to give the greatest fuel economy, i.e. the greatest range for least fuel. 4. the maximum effective distance of operation . Preci-sion approach radar (PAR) is subject to weather interference and has a limited range. . verb . to range from … to … to vary from … to … . Temperatures