MM

[`emm-`emm] abbreviation

Terminological databases

ID 735180 Last modified 03.05.2024

Domain air traffic

keskmarker

middle marker

middle marker beacon

средний радиомаркер

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
Good to know
- 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.

Good to know

Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennundusside (telekommunikatsioon)

keskmarker

Usage examples

Keskmarker asub tavaliselt raja lähedal otsusekõrguse punktis, kus glissaadi kõrgus maapinnast on umbes 200 jalga. Keskmarkeri signaal koosneb punktidest ja kriipsudest sagedusel 1300 Hz, 6 märki sekundis ja sünkroonselt vilgub oranž lamp.

MM abbreviation

middle marker

Usage examples

The middle marker shall be located so as to indicate the imminence, in low visibility conditions, of visual approach guidance.

middle marker beacon

Usage examples

A middle marker beacon is also used. It is located on approach approximately 3,500 feet from the runway. It also transmits at 75 MHz. The middle marker transmission is modulated with a 1300 Hz tone that is a series of dots and dashes so as to not be confused with the all dash tone of the outer marker.

MM abbreviation

средний маркерный радиомаяк

средний радиомаркер

Käänata võib ka sidekriipsuta.

Inflection Type 22

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