190-02488-01 Rev. B Pilot’s Guide 2-35
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COM Alert
COM radio fail annunciations are designed to be immediately recognizable.
If a failure occurs while the control page is active, the display automatically returns
to the previous page.
Stuck Microphone
The COM transmitter automatically times out after 30 seconds of continuous
broadcasting. This may occur when:
• Push-to-talk key on the microphone is stuck or accidentally left in the keyed
position
• Push-to-talk function continues to transmit after releasing the key
The advisory message “COM push-to-talk is stuck” alerts for as long as the condition
exists.
UNIT CONDITION
GNC 355
GNC 355A
Invalid COM radio data.
For information regarding pilot response to a COM radio failure, consult the
AFMS.
If the radio fails:
• Red “X” displays over the COM key
• Advisory message alerts
• COM control page is not available
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