Page 3 2
nd
Edition – Rev 0
23-10
COMM 1 AND 2 – DESCRIPTION AND OPERATION
Garmin GMA 340
Garmin GMA340 is the audio management device used on P2002JF. The audio panel handles
internal audio communications (INTERCOM), external audio communications, those related
to the markers during ILS approaches and, eventually, those related to the on board musical
entertainment (compact disc devices etc).
Audio panel features LED-illuminated push button controls that allow audio selection of both
NAV and Comm audio. Large buttons activate the Comm microphone and audios to simplify
cockpit workload. MASQ processing reduces ambient noise from the avionics inputs. Comm
transmit indication is also provided. Speaker selection is available to monitor the aircraft
radios.
Figure 3: GMA340 front panel
Each microphone input (4 sockets are available for all airplane occupants – pilots and
passengers) has a dedicated VOX circuit to ensure that only the active microphone is heard
when squelch is broken. Special cabin noise de-emphasis circuitry enhances cockpit
communications.
A fail safe circuit connects the pilot’s left headset channel and microphone directly to COM 1
in the event of power loss or interruption.
The speaker (optional) is located on the pilot side lower panel:
To Next Page
Loading...
