
Page 7-8 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
7.2.2 GMA 1347 Testing
Apply power to the G1000 and allow system to initialize.
On the PFD, open the ALERT window and verify there are no GMA MANIFEST or configuration error
messages.
Except for marker beacon operation, an in-aircraft checkout may be performed in the aircraft with known
good microphone, headset, and speaker.
Intercom System (ICS) Check:
1. Plug in headsets at each ICS position.
2. Ensure that the MAN SQ key is off (no light).
3. Adjust volume for each position and verify that the ICS is working properly.
4. Check Pilot and Copilot ICS positions for isolation and proper operation of volume and squelch
controls.
5. Press the PA key. Verify that microphone audio is heard over the speaker when the Push-To-
Talk (PTT) key is pressed.
Transceiver Operational Check:
Perform a ramp test radio check by exercising the installed transceivers, microphone, microphone key and
audio over the headphones and speaker. Verify that communications are clear and PTT operation is
correct for each pilot position.
1. Select the audio source corresponding to each installed avionics unit (i.e. NAV1, NAV2, COM1,
COM2) and check for audio over the headsets.
2. Press the SPKR key and verify that the selected audio is heard over the speaker.
Failsafe Operation Check:
1. Turn the GMA 1347 off by pulling the AUDIO circuit breaker. This directs all COM 1 phone
audio, MIC audio and MIC key to the pilot’s position.
2. Check the failsafe operation by exercising the COM 1 microphone, microphone key and audio
over the headphones. All volume control for the COM audio should be through the PFD/MFD
volume control. Verify proper operation of COM 1 using the failsafe operation.
3. Close the AUDIO circuit breaker to continue testing.
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