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Page 3-4 GMA 240 Installation Manual
Rev. A 190-00917-01
2. Plug in headsets at each ICS position.
NOTE
For helicopter operation using a two-stage Intercom/PTT switch, prior to
using the keyed-intercom mode, the VOX level should be set by
adjusting the VOX knob while the first detent is actuated and held.
3. Check Pilot and Copilot ICS positions for isolation and proper operation of volume and squelch
controls.
3.5.5 Aircraft Receivers Check
1. Select the audio source corresponding to each installed avionics unit and check for audio over the
headsets.
3.5.6 Music System Check
1. Set the intercom to the ALL mode [Pilot ISO LED off.]
2. Connect a stereo audio source to MUSIC 1 (ensure the front panel jack is empty and the music
volume knob is not set to minimum). Verify that stereo audio is heard over all headset positions
when MUSIC 1 is selected as the music source and MUSIC LED is on. Pull out on the right side
small knob and verify that music volume adjustment is working properly.
3. Select an audio source to COM 1 and verify that the sound is muted by active COM 1 audio when
RADIO music mute is selected and by intercom audio when ICS music mute is selected.
4. Connect a stereo music source to MUSIC 2. Verify that stereo audio is heard when MUSIC 2 is
selected as the music source and MUSIC LED is on.
5. Connect a stereo audio source to the front panel jack. Verify that stereo audio is heard when
MUSIC 1 is selected as the music source and MUSIC LED is on.
CAUTION
Be sure to check all aircraft control movements before flight is attempted
to ensure that the wiring harness does not touch any moving part.
This completes the in-aircraft post installation checkout. Perform a flight test after installing the unit to
ensure satisfactory performance of the audio functions.
3.6 CONFIGURATION ADJUSTMENTS
Adjustment to the Volume and Squelch settings can be made to the GMA 240 through access holes in the
unit’s top cover. Refer to Section 2.3 for details.
3.7 CONTINUED AIRWORTHINESS
Maintenance of the GMA 240 is “on condition” only. Refer to the GMA 240 Maintenance Manual
(Garmin P/N 190-00917-02) as needed. Periodic maintenance of the GMA 240 is not required.
Instructions for Continued Airworthiness (ICA) are not required for this product under 14 CFR Part 21
since the GMA 240 has received no FAA approval or endorsement.