Garmin GTN 725 Pilot's Manual page 501

Message
DATALINK -
GDL88 ADS-B
fault. Pressure
altitude input is
invalid.
DATALINK -
GDL88 ADS-B
traffic has failed.
DATALINK -
GDL88 CSA failure.
DATALINK -
GDL88 external
traffic system
inoperative or
connection lost.
DATALINK -
GDL88 external
traffic system has a
low battery.
DATALINK -
GDL88
configuration
module needs
service.
DATALINK -
GDL88 needs
service.
190-01007-03 Rev. D
Description
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.
The GDL 88 is reporting
to the GTN that the
CSA application has
failed. Traffic alerting
on ADS-B traffic is
unavailable.
The GDL 88 has
detected a TAS/TCAS
input fault.
The GDL 88 is reporting
that the external traffic
system has a low
battery.
The GDL 88
has detected a
configuration module
fault.
GDL 88 has detected
an internal fault.
Garmin GTN 725/750 Pilot's Guide
Action
Contact dealer for service.
Contact dealer for service.
Ensure the aircraft has a clear view
of the sky. If the problem persists.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Charts
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
17-9
Index