instrument error The inaccuracy of an instrument.
instrument flight A blind flight — i.e., one in which the pilot controls the path and altitude of the aircraft solely by instrument.
instrument lamp A lamp that illuminates or irradiates an instrument.
instrument landing station A special radio station for aiding in landing aircraft.
instrument landing system Abbreviated ILS. A radionavigation system intended to aid aircraft in landing. It provides lateral and vertical guidance, including distance from the landing point. Consists of four ground radio transmitting stations at and in the vicinity of an airport, which radiate direction and position signals to approaching aircraft that are received on an instrument in the aircraft and alert the ...
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