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marker beacon
Definição1
A low-powered, 75-MHz, fixed-frequency radio transmitter that directs its signal vertically upward in a small, fan-shaped pattern. Marker beacons are located along the flight path used when approaching an airport for landing, and are identified by their modulation frequency and keying code. When received by compatible airborne equipment, marker beacons indicate to othe pilot, both aurally and visually, when the aircraft is directly over the facility. When the aircraft is directly above the outer marker the pilot hears a series of 400-hertz dashes and the blue light illuminates in the series of dashes. Over the middle marker, the amber light illuminates in a series of alternate dots and dashes and the aural tone is a series of 1,300-hertz dots and dashes. The inner marker is identified by the white light illuminating in a series of dots and a series of 3,000-hertz dots is heard by the pilot.
Fonte1
CRANE, Dale (ed.). Dictionary of aeronautical terms. 2nd ed. Renton: ASA, 1991.
Fonte2
ARAÚJO, João Richard Barcelos. Inglês técnico: técnicos em manutenção de aeronaves. [S.l]: [s.n.], [200-]. 100 p.
Fonte3
ANTAS, Luiz Mendes. Glossário de termos técnicos. São Paulo: Traço, 1979. 756 p. (Coleção Aeroespacial; t. 1.)
Contexto
The monitor system, when provided, should be checked to ensure that it will detect erroneous transmissions from the marker beacon.
Subárea
Air Navigation Aids
Français
radioborne
Imagem

 A middle marker beacon antenna at Ontario International Airport in California.

A middle marker beacon antenna at Ontario International Airport in California.

Fonte: http://en.wikipedia.org/wiki/File:Middle-marker-ont.jpg