Garmin Flight Deck 100 Manuel D’Utilisation

190-00728-04  Rev. A

167

Abnormal operation of the system includes failures of the system components and failure of associated 

equipment, including switches and external devices.

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.

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.