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instrument landing system (ILS)
A radio system used in conditions of poor visibility to guide aircraft towards runways. Two radio transmitters, each producing two beams which overlap at a slight angle. The localizer, at the far end of the runway, transmits in a horizontal plane; the glide slope, at the near end of the runway, does so vertically, the overlap sloping up from the runway at an angle of about 3°. Instruments in the pilot's cockpit indicate deviations from the "cone" of the two overlaps, so guiding the pilot into the point where direct observation of the runway is possible.
Related categories
• INSTRUMENTATION
• AERODYNAMICS AND AERONAUTICS
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