Com Radio - Garmin GTN 725 Cockpit Reference Manual

Message
CDI/HSI FLAG-
Main lateral/vertical
fl ag 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. B
Description
Main Lateral Superfl ag
or Main Vertical
Superfl ag 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 airfl ow (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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