Garmin G1000 NXi Supplemental Maintenance Manual page 112

9. Initiate passenger address using pilot's headset boom mic by keying the pilot's PTT.
Verify the following:
•
Clear PA audio can be heard over cabin speaker and headsets
•
PA selected annunciator on GMA flashes ~ once per second during PA address.
10. Repeat Step 8 using hand mic.
11. Initiate passenger address using copilot's headset boom mic by keying the copilot's PTT.
Verify the following:
•
Clear PA audio can be heard over cabin speaker and headsets
•
PA selected annunciator on GMA flashes ~ once per second during PA address.
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. On the pilot's audio panel, select the audio source corresponding to each installed
avionics unit (i.e. NAV1, NAV2, COM1, COM2, ADF and DME) and check for audio over
the pilot's headset.
2. Press the SPKR key on pilot's audio panel and verify that the selected audio is heard
over the pilot's speaker.
Failsafe Operation Check – GMA 1347
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 boom mic, hand mic, microphone
key and audio over the headphones. All volume control for the COM audio should be
through the PFD volume control. Verify proper operation of COM 1 using the failsafe
operation.
3. Close the AUDIO circuit breaker to continue testing.
Marker Beacon Test
1. Using a ramp tester, simulate the outer marker, middle marker, and inner marker signals
by following the test equipment manufacturer's instructions. Verify that each marker
audio signal is present over the pilot and co-pilot headphones and speaker.
2. Verify that the outer, middle, and inner annunciations appear on PFD when the
corresponding signal is applied. Marker beacon annunciations (
at the upper left corner of the altitude indicator on the PFD. Operate the MKR MUTE
key on the GMA 1347 and ensure that the audio signal is muted.
3. If no other service is to be performed, continue to the return-to-service checks in Section
9.
G1000 Supplemental Maintenance Manual
Textron Nav III Series
190-02128-04
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Page 7-7
Revision 3