Garmin GMA 350H Installation Manual - Page 28
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3.8.5 Verify ICS (Intercom System) Operation
1. Place the audio panel into all ICS mode (refer to the applicable 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).
3.8.6 Verify Telephone and Music Operation (if installed)
1. Deselect or turn off other audio sources (MKR, transceivers, receivers, alerts). Some
configurations may mute telephone and/or music audio when aircraft audio is present.
2. From the pilot's headset position, initiate a phone call and verify that two-way
communication over the telephone can be heard when selected (refer to the applicable
pilot's guide for information on how telephone and music audio can be distributed
and insure that it is configured to be heard by the pilot).
3. Verify that all installed music sources can be heard when selected (refer to the
applicable pilot's guide for information on how telephone and music audio can be
distributed and insure that it is configured to be heard by the pilot).
3.8.7 Marker Beacon Operation (if installed)
1. With a marker signal generator/transmitter test set, generate Marker Tones.
2. From the pilot headset position, verify that marker audio can be heard when selected.
3. If the system includes integrated lamp annunciation and/or if external lamps are
installed, verify that each marker tone illuminates the proper lamp.
Outer Marker – Blue Lamp – 400 Hz (AM or received audio tone)
Middle Marker – Amber Lamp – 1300 Hz (AM or received audio tone)
Inner Marker – White Lamp – 3000 Hz (AM or received audio tone)
4. If the system is configured and/or wired to allow both HI and LO sensitivity
operation, verify that during HI SENS operation, the RF threshold is more sensitive
(marker audio/indication occurs as a lower RF power).
3.8.8 Other Optionally Installed or Configured Inputs/Outputs
Verify any other installed/configured inputs and outputs operate as described in the applicable
pilot's guide. Possible examples include PTC (voice command "Push to Command") keys, ICS
keys, Passenger ISO (isolation) toggle key, clearance recorder Play key, PA Mute output, PA
Mode Selected output, Com Active output, and Middle Marker Sense output.
Page 3-6
Revision B
The document reference is online, please check the correspondence between the online documentation and the printed version.
GMA 350/350H Installation Manual
190-01134-11