Abnormal Operation; Stuck Microphone; Com Tuning Failure; Audio Panel Fail-Safe Operation - Garmin G1000 NXi Pilot's Manual

AUDIO PANEL AND CNS

4.7 ABNORMAL OPERATION

Abnormal operation of the system includes equipment failures of the system components and failure of
associated equipment, including switches and external devices.

STUCK MICROPHONE

If the push-to-talk (PTT) Key becomes stuck, the COM transmitter stops transmitting after 35 seconds of
continuous operation. An alert appears in the 'Alerts Window' on the PFD to advise the crew of a stuck
microphone.
The COM1 MIC or COM2 MIC Key Annunciation on the Audio Panel flashes as long as the PTT Key remains
stuck.

COM TUNING FAILURE

In case of a COM system tuning failure, the emergency frequency (121.500 MHz) is automatically tuned in
the radio in which the tuning failure occurred. Depending on the failure mode, a red X may appear on the
frequency display.

AUDIO PANEL FAIL-SAFE OPERATION

If there is a failure of the Audio Panel, a fail-safe circuit connects the pilot' s headset and microphone directly
to the COM1 transceiver. Audio is not available on the speaker during Fail-safe operation.

REVERSIONARY MODE

The red DISPLAY BACKUP Button selects the Reversionary Mode. See the System Overview Section for
more information on Reversionary Mode.
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Garmin G1000 NXi Pilot's Guide for the Cessna NAV III
190-02177-02 Rev. A