Audio Panel Description; Transceivers - Garmin G1000 Pilot's Manual

5.1 AUDIO PANEL DESCRIPTION

The GMA 1347 is an audio control panel and marker
beacon system. Pressing the audio panel keys controls
audio selection of COM, NAV, and intercom.
annunciators indicate when a key function is selected.
The audio panel includes a four-position intercom
system (ICS) with electronic cabin noise de-emphasis
and two stereo music inputs. Separate knobs control
intercom audio level for the pilot and copilot/passenger.
The intercom provides four selectable modes of isolation
(All, Crew, Pilot, Copilot).
A cabin speaker is available for listening to selected
aircraft radios. MASQ (Master Avionics Squelch) processing
reduces ambient noise from the avionics inputs.
Each microphone input has an automatic squelch
threshold. Manual squelch is available by pressing the
MAN SQ key.
The audio panel provides a digital recorder that can
play back up to two and a half minutes of COM audio.
Recording is automatic when a COM signal is received.
Playback is controlled by pressing the PLAY key. Playback
can be stopped by pressing the MKR/MUTE key.
The unit controls marker beacon receiver audio and
features marker beacon audio muting.
As part of the G1000 Integrated Cockpit System, the
GMA 1347 also controls the display reversionary mode.
190-00498-00 Rev. A
LED
The audio panel features controls for three (3) major
function groups:
The controls are labeled to indicate the name of the
function. The triangular annunciator above each key
indicates when the key function is selected.
The knobs at the bottom of the unit control ICS volume
and squelch threshold levels. The small knob adjusts the
volume/squelch level for the pilot. The large knob adjusts
the volume/squelch level for the copilot/passenger. The
red DISPLAY BACKUP button below the dual volume/
squelch knob controls reversionary mode selection.

TRANSCEIVERS

The audio panel handles two separate transceivers:
Garmin G1000 Pilot's Guide for Cessna Nav III
WARNING: When the GMA 1347 Audio panel is
turned OFF or is inoperative, certain autopilots
are affected. No warning tone is supplied when
the autopilot disengages and the middle marker
sense signal is not supplied.
• Communication
• Navigation
• Intercom system (ICS)
A push-to-talk (PTT) switch must be
NOTE:
pressed to transmit on the selected radio.
• COM1 MIC
• COM2 MIC
AUDIO PANEL
5-1