Garmin GMA 340 User Manual

Page 7

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PILOT modeisolates the pilot from everyone else and dedicates the aircraft radios to the

pilot exclusively. The copilot and passengers share communication between themselves but
cannot communicate with the pilot or hear the aircraft radios.

•

CREW modeplaces the pilot and copilot on a common ICS communication channel.

The passengers are on their own intercom channel and can communicate with each other, but
cannot communicate with the crew or hear the aircraft radios.

•

ALL modeallows full intercom communication between everyone plugged in to the GMA

340. Aircraft radios are heard by all.

•

MUSIC 1 and MUSIC 2 stereo entertainment inputs are affected by the intercom mode

selected.

The following table summarizes the ICS operation for the different modes supported by the

GMA 340:

MUSIC 1 is normally muted during ICS activity. However an installation option is available to disable

ICS MUTE. Then muting of MUSIC 1 will not occur due to ICS activity. A panel mounted switch may be
installed for this function. The MUSIC 1 mute trip level is adjustable by the installing agency.

Mono/Stereo Headset

The use of stereo headsets is highly recommended.

If monaural headsets are plugged into stereo jacks that do not have a switch
installed, the unit will not be damaged.

If the pilot uses a monaural headset in a stereo jack, no audio will be heard
during failsafe operation. When using a monaural headset the pilot’s jack must
be equipped with a stereo/mono switch and it must be set to the ‘mono’ position
for proper failsafe operation.

A person listening on a monaural headset will hear only the left channel from the GMA 340 in both ears. If

a monaural headset is used at one of the passenger positions, any other passenger listening on a stereo headset
will hear audio in their left ear only, unless their headset has a stereo/mono switch and it is set for mono.

PILOT HEARS

COPILOT HEARS

PASSENGER
HEARS

MUSIC 1 MUTING
TRIGGERED BY

Selected Radios.
Pilot.

Copilot.
Passengers.
MUSIC 1.

Passengers.
Copilot.
MUSIC 1.

Copilot or passenger
ICS activity.

Selected Radios.
Pilot.
Copilot.
MUSIC 1.

Selected Radios.
Copilot. Pilot.
MUSIC 1.

Passengers.
MUSIC 2.
(MUSIC 1 in Dual
ADF)

Aircraft radio activity.
MKR activity.
Pilot or Copilot ICS
activity.

Selected Radios.
Pilot.
Copilot.
Passengers.
MUSIC 1.

Aircraft radio activity.
MKR activity.
ICS activity.

MODE

ALL
LED's
OFF)

CREW
(LED
LIT)

PILOT
(LED
LIT)