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The GMA 35 marker beacon receiver uses an audio indicator to alert you when the
aircraft passes over a marker beacon transmitter. When a green bar displays on the
MRKR Audio key, the audio from the receiver can be heard on the headsets.
Tap MRKR Volume to set the volume level of the alert.
The GMA 35 marker beacon receiver and indicators are part of the ILS system.
The marker beacon lamps ope
rate independently of any audio selection and cannot
be turned off. The GMA 35 can drive external marker lamps if required and also
provides an autopilot middle marker sense output.
Marker beacon annunciations alternate between the standard and blinking symbol
at the blink interval noted.
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Inner 250 ms
Middle 333 ms
Outer 750 ms