Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-94 Rev. 4
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.
5.7.6.4 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.
5. Repeat steps 1 through 4 for each installed NAV receiver.
5.7.6.5 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, following the instructions in Section 5.5.4.8.2.2.
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.
4. Repeat this procedure for each alert audio source connected to the GMA 35.
5.7.6.6 Receiver Audio Check
If there are receiver audio sources connected to the GMA 35, the interface should be verified as described
below. Ensure the GMA 35 as well as each interfaced receiver (DME, ADF, etc) is powered on.
1. Plug in a headset at pilot and copilot position.
2. Tune the installed receiver to a valid station.
3. Ensure audio is being received over the crew headsets.
4. Ensure the audio volume is sufficient for all anticipated cockpit noise conditions. Adjust the
audio output level as needed at the receiver.
5. Repeat steps 2 through 4 for each installed receiver.