Garmin G1000 Series, Pilot'S Manual, Page: 109 / 338

Garmin G1000 Pilot’s Guide for the Diamond DA40
190-00592-00 Rev. A 5-1
AUDIO PANEL
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. LED
annunciators indicate when a key function is selected.
The audio panel includes a four-position intercom
system (ICS) with electronic cabin noise de-emphasis.
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.
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 controls for three major
function groups:
• Communication
• Navigation
• Intercom system (ICS)
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
NOTE:
A push-to-talk (PTT) switch must be
pressed to transmit on the selected radio.
The audio panel handles two separate transceivers:
• COM1 MIC
•
COM2 MIC
The Diamond DA40 is not factory-equipped with
COM3 MIC, COM3, or TEL capability. Pressing the
COM3 MIC , COM3 , or TEL key does not illuminate the
corresponding annunciator light.