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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 7-8
7.2.2.3 COM Transceiver Operational Check
1. Connect a headset to the pilot’s headset output and mic input jack.
2. Verify that each installed transceiver (COM) can be heard when selected.
NOTE
Depending on configuration settings, the mic selected COM may mute audio from other
COMs.
3. Verify that each installed transceiver keys for transmission and transmits clear audio from the
pilot’s mic when selected for transmission and the Pilot PTT key is pressed. (Because the audio
panel can be configured to simulate received sidetone internally, verifying transmission with a
separate radio not in the system is recommended.)
NOTE
Depending on configuration settings, other transceivers may be muted during transmit.
Also, the audio panel may mute the speaker during PTT.
4. Move the headset to the copilot’s headset jacks and verify that any one of the installed transceivers
(testing each is not necessary) receives and transmits copilot mic properly as above.
7.2.2.4 NAV Audio Check
Ensure the GMA 35 and each installed NAV receiver is powered on.
1. Tune the NAV receiver to a local VOR station.
2. Ensure the Morse code identifier is being received over the crew headsets.
3. If the audio is not heard, verify the wiring to the audio panel.
4. Ensure the audio volume is sufficient for all anticipated cockpit noise conditions.
Repeat steps 1 through 4 for each installed NAV receiver.
7.2.2.5 Alert Audio Check
If there is an alert audio source connected to the GMA 35, the interface should be verified as described
below.
1. Cause the alert audio source to produce audio. (e.g., if a traffic system is installed, command the
traffic system into self-test mode; if a TAWS system is installed, command the TAWS system into
self-test mode.)
2. Verify that the alert audio source is heard in the pilot and copilot headsets and that the audio
volume is sufficient for all anticipated cockpit noise conditions. Adjust the audio volume level as
needed. For modification of configuration settings, refer to the GTN 6XX/7XX AML STC
Installation Manual.
3. If the alert audio source is not heard in the crew headsets, check the wiring from the source to the
GMA 35 alert audio inputs.
Repeat steps 1 through 3 for each alert audio source connected to the GMA 35.