microwave landing system

microwave landing system
An instrument landing system operating in the microwave spectrum (5.0–5.25 GHz/15.4–15.7 GHz) that provides precision guidance in azimuth, elevation, and distance measurement to aircraft having compatible airborne equipment. There is no requirement of a localizer and a glide slope as in an ILS (instrument landing system). An MLS allows approaches anywhere within its horizontal and vertical fan-shaped coverage area. It guides over a +/− 40° sector for landing and overshooting. It is useful for helicopters, short takeoff and landing (STOL) aircraft, and fixed-wing aircraft. The standard configuration of MLS ground equipment includes an azimuth station that provides an approach and back azimuth, an elevation station to provide an approach elevation, and precision distance-measuring equipment to indicate a continuous range of information on aircraft. On aeronautical charts, the availability of this facility is indicated by .

Aviation dictionary. 2014.

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