190-01007-C1
GTN Xi Part 23 AML STC Maintenance Manual
Rev. 1
Page 5-19
DATALINK - GDL 88 ADS-B
fault. Pressure altitude input is
invalid.
The GDL 88 has lost
communication with the
pressure altitude source.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GDL 88 ADS-B
traffic has failed.
GDL 88 may have lost GPS
position.
The GDL 88 has detected an
internal failure.
Check the
GDL 88 Fault
page in
Configuration mode on the
GTN Xi.
Refer to the GDL 88 STC
Installation Manual.
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 Xi.
Refer to the GDL 88 STC
Installation Manual.
DATALINK - GSR 56 is
inoperative or connection to
GTN is lost.
The GTN Xi is not able to
communicate with the GSR 56
Iridium transceiver.
Verify that the GTN Xi is
configured correctly for the
GSR 56.
Check the RS-232 wiring
between the GTN Xi and
GSR 56.
Check that the GSR 56 is
receiving aircraft power and is
connected to aircraft ground.
DATALINK – GSR 56 data
services inoperative; registration
required.
Registration settings have been
altered or deleted.
In Normal mode, select
System
> External LRUs
. Select the
More Info
button next to the
GSR 56 LRU. Select
Connext
Registration
and re-enter the
access code.
Account has been deactivated.
Reactivate account.
Alert Text
Possible Cause
Corrective Action
