System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
190-01007-A1
Page 5-16
Rev. 5
5.3.1.8 Weather Radar Alerts
Table 5-10. Weather Radar Alert Troubleshooting Guide
DATALINK - GDL 88 CSA
Failure
The GDL 88 is reporting to the
GTN that the CSA application
has failed. Traffic alerting on
ADS-B traffic is unavailable.
Ensure the aircraft has a clear
view of the sky.
If the problem persists, contact
Garmin technical support.
DATALINK – GDL 88 external
traffic system inoperative or
connection lost.
The GDL 88 has detected a
TAS/TCAS input fault.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GDL 88 external
traffic system has a low
battery.
The GDL 88 is reporting that
the external traffic system has
a low battery.
Refer to the GDL 88 STC
Installation Manual.
DATALINK – GDL 88
configuration module needs
service.
The GDL 88 has detected a
configuration module fault.
Refer to the GDL 88 STC
Installation Manual.
DATALINK – GDL 88 needs
service.
GDL 88 has detected an
internal fault.
Check the GDL 88 Fault page
in configuration mode on the
GTN.
Refer to the GDL 88 STC
Installation Manual.
Alert Text
Possible Cause
Corrective Action
WX RADAR FAIL – Weather
radar is inoperative.
GTN ARINC 708 input port or
ARINC 429 output not
configured correctly.
Check ARINC 708 port setting
for port 1. Raw ARINC 708
data can be viewed on the
GTN DIAGNOSTICS - ARINC
INPUTS page in configuration
mode.
Verify that ARINC 429 Out 3 is
configured for Radar Format 1.
Improper setup on the weather
radar.
Verify the configuration of the
weather radar.
Wiring connections are
incorrect.
Check wiring.
Weather radar is reporting a
system fault.
Check weather radar status
page on the GTN in
configuration mode.
Refer to the weather radar
installation manual.
WX RADAR SERVICE –
Weather radar needs service.
Return unit for repair.
Weather radar is reporting a
system failure.
Refer to the weather radar
installation manual for
troubleshooting.
Alert Text
Possible Cause
Corrective Action
