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Operation
SYSTEM OPERATION
Multifunction Controls
The Pilot side volume knob controls the ON
and OFF function, the pilot' s intercom volume
plus manual and automatic squelch.
When pressed, manual squelch is selected and the MAN
SQ LED is ON indicating that squelch is adjusted manually.
When pressed again the MAN SQ LED turns OFF and squelch
is automatic.
The Copilot side volume knob controls the
Copilot and passenger intercom volume level.
The MKR/MUTE key selects marker audio
and "Smart Mutes" the marker signal. That is,
the marker tone is silenced, then waits for the
next marker tone. It also turns ON/OFF Music Muting, plus
cancels the COM audio playback.
8
The SPKR key turns the cabin speaker ON
and OFF. Pressing and holding for 2 seconds
selects PA mode. The SPKR key LED blinks
when PA is active.
Power ON/OFF
The GMA 347 may be powered ON and OFF with the
avionics master switch.
To control the ON and OFF function with the Pilot ICS
volume, rotate the knob clockwise out of the detent to turn
ON and counterclockwise into the detent to turn OFF.
During power-up, the unit undergoes a self-test, illuminat-
ing all panel annunciator lights for two (2) seconds. Once the
self-test is complete, the unit is ready for use with the same
keys selected when the system was last powered OFF.
Voice Recorder
The voice recorder feature records all the audio heard on
any selected COM radio. Recording begins automatically
unless the external RECORDER OFF function is activated.
Playback is heard by anyone listening on the selected radios.
Garmin GMA 347 Pilot's Guide
190-00325-00 Rev. A
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