Diamond DA 42 NG, Maintenance Manual

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AIRCRAFT
DA 42 NG AMM Communications
Doc # 7.02.15
Rev. 4
23-50-00
Page 3
15 Mar 2018
2. Description and Operation
Figure 1 shows the GMA 1347 audio control panel of the DA 42 NG airplane. The audio control panel
is powered with the Garmin 1000 ICS and is an integral component of the integrated cockpit system.
The audio control panel makes an interface between the audio systems of the integrated cockpit
system (ICS) and the pilots'/crew headsets.
The audio control panel is located in the instrument panel between the ICS displays. The control panel
keys have LED annunciator labels and has backlighting which is controlled by the ICS. When a key
is active the annunciator is lit by the LED. The control panel performs a self-test when power is applied
to the panel which then resets the panel to the operating condition that was set when the panel was
last powered off. If the control panel fails the self-test the panel switches to a fail safe mode and all fail
safe audio output is directed to the pilot’s headset.
The control panel has these keys and selectors:
)
COM 1 MIC key. Press this key to select COM 1 as the active microphone source and to
automatically deselect any COM MIC key that may have been previously selected. The COM 1 MIC
key annunciator illuminates and the COM 1 caption on the ICS display screen is highlighted.
)
COM 2 MIC key. Press this key to select COM 2 as the active microphone source and to
automatically deselect any COM MIC key that may have been previously selected. The COM 2 MIC
key annunciator illuminates and the COM 2 caption on the ICS display screen is highlighted.
)
COM 3 MIC key. This key is not active in the DA 42 NG installation.
)
COM 1/2 key. Press this key to toggle the selection of the split com function. When COM 1/2 is
selected COM 1 becomes the dedicated COM system for the pilot’s mic/audio and COM 2 becomes
the dedicated COM system for the co-pilot’s mic/audio. When the split com function is selected both
the pilot and co-pilot can transmit simultaneously using separate COM systems. The pilot can also
monitor all the NAV audio as selected. The co-pilot can only monitor the COM 2 audio.
)
COM 1 key. Press this key to select COM 1 as the active audio source. Selecting COM 1 audio
using this key maintains COM 1 as an audio source independent of any other selection. The
annunciator illuminates when the COM 1 key is activated.
)
COM 2 key. Press this key to select COM 2 as the active audio source. Selecting COM 2 audio
using this key maintains COM 2 as an audio source independent of any other selection. The
annunciator illuminates when the COM 2 key is activated.
)
COM 3 key. This key is not active in the DA 42 NG installation.
)
TEL key. This key is not active in the DA 42 NG installation.