Pilot's Guide

Garmin G1000 Pilot’s Guide for Tiger AG-5B190-00617-00 Rev. A
5-1
DESCRIPTION
SECTION 5 AUDIO PANEL
5.1 OVERVIEW
This section describes the Garmin GMA 1347 audio
panel and its operating instructions.
The Garmin GMA 1347 is an audio control panel and
marker beacon system. Pressing the audio panel keys
controls audio selection of COM, NAV and intercom. LED
annunciators indicate when a key function is selected.
The audio panel includes a four-position intercom sys
-
tem (ICS) with electronic cabin noise de-emphasis. Sepa
-
rate 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 air
-
craft 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. Play
-
back 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.
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.
The audio panel features three (3) major groups of
keys as shown in Figure 5-1:
• Communication keys
• Navigation keys
• Intercom system (ICS) keys
Each key is labeled to indicate the name of the func
-
tion. The triangular annunciator above each key indicates
when the key function is selected.
The knobs at the bottom of the unit control ICS vol
-
ume 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 vol-
ume/squelch knob controls reversionary mode selection.
TRANSCEIVERS
The audio panel handles two separate transceivers:
• COM1 MIC
• COM2 MIC
NOTE: A push-to-talk (PTT) switch must be
pressed to transmit on the selected radio.
The audio panel accepts up to four (4) microphone
inputs, providing two (2) crew and two (2) passenger in-
tercom stations in the aircraft.
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