Garmin GMA 340 Panduan Pilot - Halaman 3

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On, Off, and Fail-Safe Operation

The GMA 340 is powered off when the left small knob (5) is rotated fully CCW into the detent.

To turn the unit on, rotate the knob clockwise past the click. The knob then functions as the pilot

ICS volume control. A fail-safe circuit connects the pilot' s headset and microphone directly to

COM1 in case power is interrupted or the unit is turned off.

LED button annunciator and marker beacon lamp intensity are controlled automatically by a

built-in photocell on the front panel. Nomenclature backlighting is controlled by the aircraft dim-

mer buss.

Audio level is controlled by the selected COM radio volume controls.

Selection of either COM1, COM2, or COM3 for both MIC and audio source is accomplished by

pressing either COM1 MIC, COM2 MIC, or COM3 MIC (14). The active COM audio is always

heard on the headphones.

Additionally, each audio source can be selected independently by pressing COM1, COM2, or

COM3 (13). When selected this way, they remain active as audio sources regardless of which trans-

ceiver has been selected for microphone use.

When a microphone is keyed, the active transceiver' s MIC button LED blinks approximately

once per second to indicate that the radio is transmitting.

Pressing the COM 1/2 button (15) activates the split COM function. When this mode is active,

COM1 is dedicated solely to the pilot for MIC/audio while COM2 is dedicated to the copilot for

MIC/audio. The pilot and copilot can simultaneously transmit in this mode over separate radios.

Both pilots can still listen to COM3, NAV1, NAV2, DME, ADF, and MKR as selected. The split COM

mode is cancelled by pressing the COM 1/2 button a second time.

When in the split COM mode the copilot may make PA announcements while the pilot contin-

ues using COM1 independently. When the PA button is pressed after the split com mode is acti-

vated, the copilot' s mic is output over the cabin speaker when keyed. A second press of the PA but-

ton returns the copilot to normal split COM operation.

NOTE