190-00728-04 Rev. A
Embraer Prodigy® Flight Deck 100 Pilot’s Guide
167
AUDIO PANEL AND CNS
4.7 ABNORMAL OPERATION
Abnormal operation of the system includes 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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 4-55 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 4-56 COM Tuning Failure
Emergency Channel
Loaded Automatically