User Guide

190-00649-00 Rev. A
Garmin G1000 Pilot’s Guide for the Diamond DA42
4-21
AUDIO PANEL AND CNS
EMERGENCY FREQUENCY (121.500 MHZ)
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.
Emergency Channel
Loaded Automatically
Figure 4-23 COM Tuning Failure
QUICK-TUNING AND ACTIVATING 121.500 MHZ
Pressing and holding the COM Frequency Transfer Key for two seconds automatically loads the emergency
COM frequency (121.500 MHz) in the active field of the active COM radio (the one with the transfer arrow).
Figure 4-24 Quickly Tuning 121.500 MHz
Press for two seconds to
load 121.5 MHz.
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 continues to flash as long as the PTT
Key remains stuck.
Figure 4-25 Stuck Microphone Alert