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16-4
Garmin GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. B
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
Message Description Action
COM RADIO -
Com radio may be
inoperative.
The com radio is not
communicating properly
with the system.
Press and hold the volume knob or
the external com remote transfer
(COM RMT XFR) switch, if installed
– this will force the com radio to
121.5 MHz. Contact dealer for
service.
COM RADIO -
Com overtemp
or undervoltage.
Reducing
transmitter power.
Com radio is
in overtemp or
undervoltage mode
and transmitting power
has been reduced to
prevent damage to the
com radio. Radio range
will be reduced.
Decrease length of com
transmissions, decrease cabin
temperature and increase cabin
airflow (especially near the GTN).
Check aircraft voltage and reduce
electrical load as necessary.
Contact dealer for service if this
message persists.
COM RADIO -
Com locked to
121.5 MHz. Hold
remote com
transfer key to exit.
Com radio is locked to
121.5 MHz.
The external com remote transfer
(COM RMT XFR) switch has been
held and the com radio is tuned to
121.5. To exit this mode, hold the
com remote transfer (COM RMT
XFR) switch for two seconds.
CONFIGURATION
- Terrain/TAWS
configuration is
invalid. GTN needs
service.
TAWS is inoperative
due to a configuration
problem with the GTN.
This message will be
accompanied by a TER
FAIL annunciation.
Contact dealer for service.
CONFIGURATION
MODULE -
GTN configuration
module needs
service.
The GTN cannot
communicate with its
configuration module.
The GTN may still have
a valid configuration.
Contact dealer for service.