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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 5-13
5.3.1.4 Remote Transponder Related Alerts
Table 5-6. Remote Transponder Alert Troubleshooting Guide
Alert Text Possible Cause Corrective Action
TRANSPONDER 1 -
Transponder 1 needs
service.
The transponder is reporting
a system failure.
Refer to the transponder installation
manual.
TRANSPONDER 2 -
Transponder 2 needs
service.
The transponder is reporting
a system failure.
Refer to the transponder installation
manual.
TRANSPONDER 1 -
Transponder 1 is
inoperative or connection
to GTN is lost.
The GTN cannot
communicate with the
transponder or the
transponder is reporting a
system failure.
If two transponders are present,
ensure that both GTNs are powered
on.
Check for proper configuration of the
GTN and transponder RS-232 ports.
Check for correct wiring.
Refer to the transponder installation
manual.
TRANSPONDER 2 -
Transponder 2 is
inoperative or connection
to GTN is lost.
The GTN cannot
communicate with the
transponder or the
transponder is reporting a
system failure.
Ensure that both GTNs are powered
on.
Check for proper configuration of the
GTN and transponder RS-232 ports.
Check for correct wiring.
Refer to the transponder installation
manual.
TRANSPONDER -
Transponder 1 and 2
Mode S addresses do not
match.
The transponders are
configured for different Mode
S addresses.
Check the Mode S address for each
transponder and verify that they
match.
TRANSPONDER 1 –
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.
Refer to the transponder installation
manual.
TRANSPONDER 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.
Refer to the transponder installation
manual.