Garmin G1000H Marine Radio User Manual


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190-01255-00 Rev. B
Garmin G1000H
™
Pilot’s Guide for the Bell 407GX
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onthePFDtoadvisethepilotofastuck microphone.
The
MIC1
,
MIC2
or
MIC3
Key Annunciator on the Audio Panel flashes as long as the PTT Key remains stuck.
Figure 4-47 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 4-48 COM Tuning Failure
Emergency Channel
Loaded Automatically
AUDIO PANEL FAIL-SAFE OPERATION
IfthereisafailureoftheAudioPanel,afail-safecircuitconnectsthepilot’sheadset(leftearonlyifstereo)and
microphonedirectlytotheCOM1transceiver.AudioisnotavailableonthespeakerduringFail-safeoperation.
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