4.7 ABNORMAL OPERATION
Abnormal operation of the G1000 includes equipment failures of the G1000 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 on the PFD to advise the pilot of a stuck microphone.
The COM1 MIC or COM2 MIC Key Annunciator 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.
190-00595-01 Rev. B
Figure 4-48 Stuck Microphone Alert
Emergency Channel
Loaded Automatically
Figure 4-49 COM Tuning Failure
Figure 4-50 Display Backup Button
Garmin G1000 Pilot's Guide for the Beechcraft A36/G36
AUDIO PANEL AND CNS
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