Table 5-9. Database Alert Troubleshooting Guide - Garmin GTN 6XX System Maintenance Manual

5.3.1.7 Datalink Related Alerts
Alert Text
DATALINK – GDL 69 is
inoperative or connection to
GTN is lost.
DATALINK – GDL 88 is
inoperative or connection to
GTN is lost.
DATALINK - GDL 88 ADS-B
failure. Unable to transmit
ADS-B messages.
DATALINK – GDL 88 ADS-B
fault.
DATALINK – ADS-B fault: UAT
receiver.
DATALINK – ADS-B fault:
1090 receiver.
DATALINK - GDL 88 ADS-B is
not transmitting position.
Check GPS devices.
DATALINK - GDL 88 control
panel input fault. Check
transponder is in correct mode.
DATALINK - GDL 88 ADS-B
fault. Pressure altitude input is
invalid.
DATALINK - GDL 88 ADS-B
traffic has failed.
190-01007-A1
Rev. 5

Table 5-9. Database Alert Troubleshooting Guide

Possible Cause
The GTN cannot communicate
with the GDL 69.
The GTN cannot communicate
with the GDL 88.
GDL 88 is not able to transmit
an ADS-B message due to a
failure with the GDL 88 system
or antenna(s).
The GDL 88 has detected a
fault with one of the GDL 88
UAT/1090 antennas.
The GDL 88 has detected a
UAT receiver fault.
The GDL 88 has detected a
1090 receiver fault.
The GDL 88 has detected a
position input fault.
The GDL 88 has lost
communication with the
transponder.
The GDL 88 has lost
communication with the
pressure altitude source.
GDL 88 may have lost GPS
position.
The GDL 88 has detected an
internal failure.
System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Corrective Action
Check for proper configuration.
Ensure the GDL 69 is powered
up.
Verify that the GDL 69
Ethernet ports are enabled.
HSDB data from the GDL 69
can be routed to the GTN
through other Garmin LRUs.
Ensure that all Garmin LRUs
are powered up.
Check for proper configuration.
Ensure the GDL 88 is powered
up.
HSDB data from the GDL 69
can be routed to the GTN
through other Garmin LRUs.
Ensure that all Garmin LRUs
are powered up.
Check the GDL 88 Fault page
in configuration mode on the
GTN.
Refer to the GDL 88 STC
Installation Manual.
Refer to the GDL 88 STC
Installation Manual.
Refer to the GDL 88 STC
Installation Manual.
Refer to the GDL 88 STC
Installation Manual.
Refer to the GDL 88 STC
Installation Manual.
Refer to the GDL 88 STC
Installation Manual.
Refer to the GDL 88 STC
Installation Manual.
Check the GDL 88 Fault page
in configuration mode on the
GTN.
Refer to the GDL 88 STC
Installation Manual.
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