This unit was removed serviceable from the GMA #2 position of a Cessna 182. Any re-installation WILL REQUIRE software and configuration modifications in accordance with Garmin and Manufacturer maintenance manuals.

The Garmin GMA 1347 is a vertically oriented panel mounted audio control and marker beacon system.
The system delivers reliability and versatility for all audio controlling functions. LED-illuminated push
buttons and logical panel layout allow audio selection of NAV, COM, DME, ADF, MKR, TEL, AUX,
and automatic warning audio in voice or tone annunciation. LED brightness is adjusted to a level
appropriate for ambient cockpit light conditions automatically by the GDU or manually with radio
lighting controls, depending upon installation connections. A failsafe circuit connects the pilot’s headset
and microphone directly to COM 1 in case power is interrupted or the unit is turned off.
The Garmin GMA 1347 Audio Panel incorporates a microcontroller for processing front panel key
commands, annunciator control, input/output functions, and communication.
The GMA 1347 includes a six-position intercom system (ICS) with electronic cabin noise de-emphasis,
two stereo music inputs, and combined pilot, copilot, and passenger volume controls. The intercom
provides four selectable modes of isolation (All, Crew, Pilot, Copilot). A pilot-selectable cabin speaker
output can be used to listen to the selected aircraft radios or to broadcast PA announcements. The PA
function is pilot selectable.
The GMA 1347 provides digital audio input/output capability to external radios. The unit is capable of
digitally interfacing with two transceivers and two receivers. For every channel except COM 3, the unit
generates both digital and analog outputs, and combines both digital and analog inputs.
The installation ensures that only one channel is used. A programming pin indicates whether the digital
or analog channels are used for COM 1, COM 2, NAV 1, and NAV 2. An additional digital input is used
for Voice alerting and/or Pilot checklist.
The GMA 1347 provides a digital recorder with playback capability. Recording is automatic when a
COM signal is received. Playback is controlled by pressing the PLAY button or a remote mounted
switch.
The Recorder can be disabled using an external switch. The digital clearance recorder can playback up to
two and a half minutes of recording.

I will not accept returns without a Garmin dealer #, Maintenance manual P/N and revision.