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(3) GMA 340 Intercom Functions
Intercom volume and squelch (VOX) are adjusted using the following front panel knobs:
) LEFT SMALL KNOB (5) - Unit on/off power control and Pilot ICS volume. Full counterclockwise
DETENT position OFF.
) LEFT LARGE KNOB (6) - Pilot ICS mic VOX squelch level. Clockwise rotation increases the
amount of mic audio (VOX level) required to break squelch. Full counter-clockwise is the 'hot
mic' position.
) RIGHT SMALL KNOB (7) - IN position: Copilot ICS volume. OUT position: Passenger ICS
volume.
) RIGHT LARGE KNOB (8)- Copilot and passenger mic VOX squelch level: clockwise rotation
increases the amount of mic audio (VOX level) required to break squelch. Fully counterclockwise
is the 'hot mic' position.
Each microphone input has a dedicated VOX circuit to ensure that only the active microphone(s)
is/are heard when squelch is broken. After the operator has stopped talking, the intercom
channel remains momentarily open to avoid closure between words or normal pauses.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-50-00 Page 11
20 Sep 2007
The GMA 340 provides three intercom modes: PILOT, CREW and ALL. The mode selection is
accomplished using the PILOT (10) and CREW (9) buttons.
These modes allow different degrees of interaction between the crew and passengers:
) PILOT mode isolates the pilot from everyone else and dedicates the airplane radios to the
pilot exclusively. The copilot and passengers share communication between themselves but
cannot communicate with the pilot or hear the airplane radios.
) CREW mode places 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 airplane radios.
) ALL mode allows full intercom communication between everyone plugged into the GMA 340.
Airplane radios are heard by all.
(4) GMA 340 Marker Beacon Receiver Operation
The marker beacon receiver has visual and audio indicators to show when the airplane passes
over a beacon transmitter.
The SENS button (4) selects either high or low sensitivity as indicated by the HI or LO LED
being lit. Low sensitivity is used on ILS approaches while high sensitivity allows operation over
airway markers or to get an earlier indication of nearing the outer marker during an approach.
The marker audio is selected initially by pressing the MKR/MUTE button (2). If no marker
beacon signal is being received, then pressing again will deselect the marker audio.
AIRCRAFT
Communications DA 40 Series
AMM
Page 12
20 Sep 2007 23-50-00 Doc # 6.02.01
Rev. 5
D. Marker Beacon Receiver Antenna
The Comant CI 102 marker beacon receiver antenna is located on the lower side of the fuselage,
under the baggage compartment.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-50-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the audio integrating system and the marker
beacon receiver system. If you have the trouble detailed in the Trouble column read across to the
Possible Cause column. Then do the repair given in the Repair column.
A. Intercom Functions
Trouble Possible Cause Repair
No voice modulation when
transmitting from co-pilot's side
on head-set. Pilot's side OK.
Faulty head-set.
Open mic audio line.
Faulty intercom or audio panel.
Replace head-set.
Do a test of the mic audio
wiring. Refer to Chapter 92 for
the wiring diagrams.
Replace the intercom or audio
panel.
No voice modulation when
transmitting from pilot’s side on
head-set. Co-pilot’s side OK.
Faulty head-set.
Open mic audio line.
Faulty intercom or audio panel.
Replace head-set.
Do a test of the mic audio
wiring. Refer to Chapter 92 for
the wiring diagrams.
Replace the intercom or audio
panel.
Cannot transmit. Transmit
annunciator (if available) not
showing on COM display.
Faulty mic PTT switch.
PTT wiring circuit open.
Faulty COM unit.
Faulty audio panel.
Replace the defective PTT
switch.
Do a test of the PTT wiring.
Refer to Chapter 92 for the
wiring diagrams.
Replace the COM unit.
Replace the audio panel.
No intercom audio on pilot’s
head-set. Receives radio
transmissions correctly.
ISO mode (PM 100 II or KMA)
or PILOT mode (GMA 340)
selected.
Select ALL mode.
Faulty intercom or audio panel. Replace the intercom or audio
　
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