Garmin GTN 625 Reference Manual page 88

Message
TRANSPONDER -
Transponder 1
and 2 Mode S
addresses do not
match.
TRANSPONDER
1 OR 2 -
ADS-B is not
transmitting
position.
TRANSPONDER
1 OR 2 -
ADS-B Out system
fault. Pressure
altitude source
inoperative or
connection lost.
TRANSPONDER
1 OR 2 -
Transponder 1 or
2 is inoperative or
connection to GTN
is lost.
TRANSPONDER
1 OR 2 -
Transponder 1 or 2
needs service.
78
Description
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.
The transponder has
insufficient data to
support ADS-B.
The transponder has
lost communication
with the pressure
altitude source.
The GTN is configured
for transponder 1 or
2 but is not able to
communicate with the
transponder.
The transponder is
reporting to the GTN
that it needs service.
The transponder may
continue to function.
GTN 625/635/650 Cockpit Reference Guide
Action
Contact dealer for service.
Ensure the aircraft has a clear
view of the sky. Contact dealer for
service.
Contact dealer for service.
Verify squawk code and altitude
with ATC. Contact dealer for
service.
Verify squawk code and altitude
with ATC. Contact dealer for
service.
190-01004-04 Rev. N