System Maintenance Manual

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 7-5
190-00682-01 Revision F
14. On GMA 2, select PA and verify the PA select annunciator is illuminated on GMA2. Verify
COM1 active frequency is displayed white.
15. Initiate passenger address using pilot’s headset boom mic by keying the pilots PTT. Verify clear
PA audio can be heard over cabin speaker and passenger headsets, PA selected annunciator on
GMA1 flashes ~ once per second during PA address. Repeat using pilot hand mic.
16. Initiate passenger address using copilot’s headset boom mic by keying the copilots PTT. Verify
clear PA audio can be heard over cabin speaker and passenger headsets, PA selected annunciator
on GMA1 flashes ~ once per second during PA address. Repeat using copilot hand mic.
7.2.1.3 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 the pilot’s audio panel and verify that the selected audio is heard over the
pilot’s speaker.
3. On the co-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 co-pilot’s headset.
4. Press the SPKR key on the co-pilot’s audio panel and verify that the selected audio is heard over the
co-pilot’s speaker.
7.2.1.4 Failsafe Operation Check – GMA 1347D #1
1. Turn the GMA 1347D #1 off by pulling the AUDIO NO 1 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 NO 1 circuit breaker to continue testing.
7.2.1.5 Failsafe Operation Check – GMA 1347D #2
1. Turn the GMA 1347D #2 off by pulling the AUDIO NO 2 circuit breaker. This directs all COM 2
phone audio, MIC audio and MIC key to the co-pilot’s position.
2. Check the failsafe operation by exercising the COM 2 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 2 using the failsafe operation.
3. Close the AUDIO NO 2 circuit breaker to continue testing.