MAINTENANCE MANUAL
AQUILA AT01
Aviation by Excellence AG
AUDIO INTEGRATING - MAINTENANCE PRACTICES
1.
A.
This section covers that portion of the system which controls the output of the communications
and navigation receivers into the flight crew headphones and speakers, and the output of the
flight crew microphones into the communication transmitters.
B.
The GMA 340 intercom system consists primarily of the GMA 340 audio control unit, located on
the instrument panel in the avionics column, the pilot and co-pilot audio jacks mounted on the
middle console near the seat backs, and the Push-To-Talk (PTT) switches located on the control
sticks.
The Garmin GMA 340 Audio Panel (Refer to Figure 201) provides audio amplification, audio
selection, marker beacon control (optional), and a voice activated intercom system for the headsets
and microphones.
The system allows audio switching for up to three transceivers (COM 1,COM 2, and COM 3) and
five receivers (NAV 1, NAV 2, ADF, DME, and MKR). A fail-safe mode connects the pilot
headphone and microphone to COM 1 if power is removed or if the Mic Selector switch is turned
to the OFF position.
C.
For a complete description of the GMA 340 Audio Panel, refer to the GARMIN GMA 340 Audio
Panel Pilot's Guide, P/N 190-00149-10, Rev. A, or higher.
D.
Refer to Garmin GMA 340 Audio Panel Installation Manual, P/N 190-00149-01, Rev. K or later for
additional maintenance information on the GMA 340.
2.
A.
Remove Garmin GMA 340 Audio Control Unit
(1) Ensure battery and main avionics switches are in OFF position.
(2) Insert a 3/32 Allen wrench into the jackscrew access hole on the faceplate (Refer to Figure
201).
(3) Turn jackscrew counterclockwise to loosen locking cam. Cam will move the unit out and
disengage from the electrical connectors.
(4) Carefully pull audio control unit from the rack.
B.
Install Garmin GMA 340 Audio Control Unit
CHECK WIRING CONNECTIONS FOR ERRORS BEFORE INSERTING THE
GMA 340 INTO THE TRAY. INCORRECT WIRING COULD CAUSE INTERNAL
COMPONENT DAMAGE.
(1) Slide the unit into the rack until the jackscrew makes contact with the receptacle located in
the back plate.
(2) Insert a 3/32 Allen wrench into the jackscrew access hole on the faceplate (Refer to Figure
201).
General
Garmin GMA 340 Audio Control Unit Removal/Installation
CAUTION:
23-50-00
Page 201
EFFECTIVITY
Aircraft equipped with Garmin Avionics
Communications
30.04.08
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