middle marker

An ILS (instrument landing system) navigation facility in the terminal area navigation system located approximately 3500 ft from the runway approach end on the extended centerline, transmitting a 75 MHz fan-shaped radiation pattern, modulated at 1300 Hz. It is keyed alternately dot and dash and received by compatible airborne equipment, indicating to the pilot both aurally and visually, that he or she is passing over the facility. The middle marker is located at or near the point of decision height for ILS Cat I. See marker beacon.

Aviation dictionary. 2014.

Look at other dictionaries:

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