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Similar to the outer and middle markers, a inner marker located at the beginning (threshold) of the runway on some ILS approach systems (usually Category II and III) having decision heights of less than 200 feet (60 m) AGL. Triggers a flashing white light on the same marker beacon receiver used for the outer and middle markers; also a series of ...
Optional marker beacon(s) provide distance information as the approach proceeds, including the middle marker (MM), placed close to the position of the (CAT 1) decision height. Markers are largely being phased out and replaced by distance measuring equipment (DME). The ILS usually includes high-intensity lighting at the end of the runways to ...
A signal, amplitude modulated at 1,300 cycles per second, may be keyed at two dashes per second, six dots per second, or may be unkeyed. The marker beacon transmitter projects a vertical fan-shaped pattern to a height of approximately 3,000 feet. The transmitter is placed so that the longer horizontal axis is perpendicular to the line of approach.
A marker beacon is a specialized beacon used in aviation, in conjunction with an instrument landing system (ILS), to give pilots a means to determine distance to the runway. Marker beacons transmit on the dedicated frequency of 75 MHz. This type of beacon is slowly being phased out, and most new ILS installations have no marker beacons.
Emission patterns of the localizer and glide slope signals Glide slope station for runway 09R at Hannover Airport in Germany. In aviation, instrument landing system glide path, commonly referred to as a glide path (G/P) or glide slope (G/S), is "a system of vertical guidance embodied in the instrument landing system which indicates the vertical deviation of the aircraft from its optimum path ...
Localizer as component of an ILS (KMEZ runway 27, Mena, Arkansas) Emission patterns of the localizer and glide path signals. An instrument landing system localizer, or simply localizer (LOC, [1] or LLZ prior to 2007 [2]), is a system of horizontal guidance in the instrument landing system, which is used to guide aircraft along the axis of the runway.
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The localizer approach for runway 31L used an Outer Marker Beacon (OMB) named "Kedzie", located 3.3 nmi (6.1 km; 3.8 mi) prior to the runway threshold. Under the published landing procedures, the aircraft was to maintain a minimum altitude of 1,500 feet (460 m) until it passed the OMB, at which point the flight was allowed to descend to a ...
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