Garmin G1000 Piper PA-46 Matrix - Manual (Page 155)

190-01108-00 Rev. B Garmin G1000 Pilot’s Guide for the Piper PA-46 Mirage/Matrix 141
AUDIO PANEL AND CNS
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EICAS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
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.
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. Fail-safe operation
may be tested by turning the Audio Panel off.
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 crew 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.
Figure 4-50 Stuck Microphone Alert
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.
Figure 4-51 COM Tuning Failure
Emergency Channel
Loaded Automatically
NOTE: If tuning fails for the selected COM, the crew must select the other COM manually in order to tune.
It is not automatically selected.