87
190-01007-04 Rev. K
GTN 725/750 Cockpit Reference Guide
Me
ssage
s
Message
Description
Action
TRANSPONDER -
Transponder 1
and 2 Mode S
addresses do not
match.
The GTN is configured
for two transponders
and their Mode S
addresses do not
match. This message
is intended to assist
installers and will not
occur in a properly
configured system.
Contact dealer for service.
TRANSPONDER
1 OR 2 -
ADS-B is not
transmitting
position.
The transponder has
insufficient data to
support ADS-B.
Ensure the aircraft has a clear
view of the sky. Contact dealer for
service.
TRANSPONDER
1 OR 2 -
ADS-B Out system
fault.
Pressure
altitude source
inoperative or
connection lost.
The transponder has
lost communication
with the pressure
altitude source.
Contact dealer for service.
TRANSPONDER
1 OR 2 -
Transponder 1 or
2 is inoperative or
connection to GTN
is lost.
The GTN is configured
for transponder 1 or
2 but is not able to
communicate with the
transponder.
Verify squawk code and altitude
with ATC. Contact dealer for
service.
TRANSPONDER
1 OR 2 -
Transponder 1 or 2
needs service.
The transponder is
reporting to the GTN
that it needs service.
The transponder may
continue to function.
Verify squawk code and altitude
with ATC. Contact dealer for
service.
