Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
190-02177-02 Rev. A
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
138
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.