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2-5190-01182-01 Rev. A
Garmin GNC 255A/255B Pilot’s Guide
2.2.6 Emergency Channel
1. Press and hold the FLIP/FLOP key or the Com Remote Transfer
(COM RMT XFR) key for approximately two seconds.
Figure 2-9 Emergency Channel
2. The Emergency Channel will be inserted into the Active
Frequency position and the previous Active Frequency will
become the Standby Frequency.
NOTE: Pressing and holding the Com Remote Transfer (COM RMT XFR)
key for approximately two seconds, on units so configured, will lock the
COM board, preventing further changes in Com frequency until the Com
board is unlocked, by pressing the Com Remote Transfer key again for two
seconds. The following message will notify the pilot that the Com board
has been locked: “COM LOCKED TO 121.5 MHZ. HOLD REMOTE COM
TRANSFER KEY TO EXIT.”
NOTE: Under some circumstances if the Com system loses communication
with the main system, the radio will automatically tune to 121.50 MHz for
transmit and receive regardless of the displayed frequency.
2.2.7 Stuck Mic
The GNC 255 helps protect you from a situation where the microphone may
get stuck in the ON or Transmit position. If the microphone is keyed for longer
than 35 seconds, the GNC 255 will return to the receive mode on the selected
frequency.
A “Stuck Mic” message will display until the transmit key is released. Alerts
will display until the error clears or the user acknowledges it.
2.2.8 Remote Frequency Selection Control
On units configured for remote Com frequency Recall, pressing the remote
recall switch will load the next preset Com frequency into the unit’s Standby
frequency box. The remote recall switch can be pressed multiple times to scroll
the entire preset frequency list through the Standby frequency box (the list will
“wrap” from the bottom of the list back up to the top, skipping any empty preset
positions).
The standby frequency isn’t activated until a Com FLIP/FLOP switch (either
bezel-mounted or remote (COM RMT XFR) is pressed. Remote Frequency Selection
only functions on units configured for a remote Com Frequency recall switch.