Garmin G1000 Audio Panel Pilot’s
TM
G1000
Audio Panel Pilot’s Guide
for the Beechcraft A36/G36
Record of Revisions
Revision Date of Revision Revision Page Range Description
A 07/20/05 6-1 – 6-11 Initial release.
Garmin G1000 Pilot’s Guide for the Beechcraft A36/G36
190-00573-00 Rev. A
DESCRIPTION
6.1 INTRODUCTION
This Pilot’s Guide 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 six-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.
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 6.1.1:
• Communication keys
• Navigation keys
• Intercom system (ICS) keys
Each key is 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:
• COM1 MIC
• COM2 MIC
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.
190-00573-00 Rev. A
NOTE: A push-to-talk (PTT) switch must be
pressed to transmit on the selected radio.
The audio panel accepts up to six (6) microphone
inputs, providing two (2) crew and four (4) passenger
intercom stations in the aircraft.
Garmin G1000 Pilot’s Guide for the Beechcraft A36/G36
6-1
DESCRIPTION
MONO/STEREO HEADSETS
The audio panel can accommodate up to six (6)
headsets, pilot, copilot and up to four (4) passengers.
Stereo headsets are recommended for use in this aircraft.
Using a monaural headset in a stereo jack shorts the
right headset channel output to ground. While this does
not damage the audio panel, a person listening on a
monaural headset hears only the left channel in both ears.
If a monaural headset is used at one of the other positions,
any other listener using a stereo headset hears audio in the
left ear only, unless their headset has a mono/stereo switch
that is set to mono.
UNMUTED/UNSWITCHED INPUTS
The unit provides four (4) unmuted/unswitched inputs
that are always present on the headsets or speaker. These
inputs are the following aural warnings:
• ALTITUDE WARNING
• UNSWITCHED 1
• UNSWITCHED 2
• UNSWITCHED 3
FRONT PANEL CONTROLS
• Transceiver audio selector keys
(COM1, COM2)
• Transmitter (audio/mic) selection keys
(COM1 MIC, COM2 MIC)
• Passenger address key
(PA)
• Speaker key
(SPKR)
• Marker beacon receiver audio select/mute key
(MKR/MUTE)
• Marker beacon receiver high sensitivity key
(HI SENS)
• Aircraft radio audio selector keys
(NAV1, NAV2)
• Intercom manual squelch key
(MAN SQ)
• Digital recording playback key
(PLAY)
• Intercom system (ICS) isolation keys
(PILOT, COPLT)
• Volume/squelch knob
(VOL/SQ)
• Reversionary mode button
(DISPLAY BACKUP)
Garmin G1000 Pilot’s Guide for the Beechcraft A36/G36
190-00573-00 Rev. A6-2
DESCRIPTION
Transmitters
Not recommended for
use in A36/G36 aircraft
Passenger Address
Marker Beacon/Mute
Optional on
A36/G36 aircraft
Disabled on
A36/G36 aircraft
Manual Squelch
Transceiver Audio
Disabled on
A36/G36 Aircraft
Speaker
Marker Beacon Signal Sensitivity
Navigation Radio Audio
Digital Recording Playback
ICS Isolation
190-00573-00 Rev. A
VOL/SQ
VOL Annunciation
Garmin G1000 Pilot’s Guide for the Beechcraft A36/G36
SQ Annunciation
Reversionary Mode Control
Figure 6.1.1 Front Panel Controls
6-3
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