Installation Instructions

190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 5-95
5.7.6.7 Intercom System (ICS) Check
NOTE
If a monaural headset is plugged into any stereo phone jack position, no damage will
occur to the GMA 35. In the case of plugging a monaural headset into any passenger
position, any stereo listener will lose one channel when another passenger plugs in a
monaural headset.
1. Place the audio panel into ALL ICS mode (refer to the GTN Pilot’s guide) so that all ICS
positions hear all others.
2. Deselect or turn off other audio sources (MKR, transceivers, receivers, alerts). Some
configurations may mute passenger intercom audio to crew when aircraft audio is present.
3. From the pilot headset position, verify the pilot, copilot, and all passenger mic inputs can be
heard in the pilot’s headset when speaking into the mic input under test (adjust pilot ICS volume
if necessary).
4. Speak into the pilot’s mic and verify that pilot mic audio is heard in the copilot headset (adjust
copilot ICS volume if necessary) and in each passenger headset (adjust passenger ICS volume if
necessary).
5.7.6.8 Aircraft Receivers Check
1. Select the audio source for each avionics unit installed in the aircraft and check for audio over the
headsets.
2. Touch the Cabin Speaker key and verify that any selected audio is heard over the speaker.
5.7.6.9 Music System Check (if installed)
1. Set the intercom to the ALL mode.
2. Connect a stereo audio source to MUSIC 1 or MUSIC 2. Verify that stereo audio is heard over
the Pilot headset position.
3. Tune a station on COM 1 and verify that the sound is muted by active COM 1 audio (break
squelch on COM 1 if necessary).
4. Verify that stereo audio is also heard in the passenger headsets.