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AUDIO PANEL AND CNS
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.
130
Figure 4-51 Stuck Microphone Alert
Emergency Channel
Loaded Automatically
Figure 4-52 COM Tuning Failure
Figure 4-53 Display Backup Button
Garmin G1000 Pilot's Guide for the Diamond DA40/40F
190-00592-06 Rev. A
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