68
GTN 725/750 Cockpit Reference Guide
190-01007-04 Rev. K
Messages
Message
Description
Action
CDI/HSI FLAG -
Main lateral/
vertical flag
on CDI/HSI is
inoperative.
The Main Lateral
Superflag or Main
Vertical Superflag
output has been turned
off due to an over-
current condition.
Verify course guidance is valid
and correct by crosschecking with
the GTN on-screen CDI and other
navigational equipment. Contact
dealer for service.
CDI SOURCE -
Select appropriate
CDI source for
approach.
Aircraft is on a GPS
approach but CDI is set
to VLOC, or aircraft is
on VLOC approach and
CDI is set to GPS
and
aircraft is less than
2 nm from the FAF.
Select the appropriate CDI source
for approach.
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.
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 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.
