Garmin GTN 725 Cockpit Reference Manual page 65

Message
CDI/HSI FLAG-
Main lateral/vertical
flag on CDI/HSI is
inoperative.
COM RADIO-
COM radio needs
service.
COM RADIO-
COM radio may be
inoperative.
COM RADIO-
COM overtemp or
undervoltage. Reducing
transmitter power.
COM RADIO-
COM locked to 121.5
MHz. Hold remote COM
transfer key to exit.
190-01007-04 Rev. D
Description
Main Lateral Superflag or
Main Vertical Superflag
output has been turned
off due to an over-current
condition.
COM radio is reporting
that it needs service. The
COM radio may continue
to function.
COM radio is not
communicating properly
with the system.
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.
COM radio is locked to
121.5 MHz.
GTN 725/750 Cockpit Reference Guide (CRG)
Action
Verify course guidance
is valid and correct by
crosschecking with the GTN
on-screen CDI and other
navigational equipment.
Contact dealer for service.
Contact dealer for service.
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.
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.
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.
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