Garmin GTN 725 Cockpit Reference Manual page 84

Message
DATALINK -
GDL 69 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 -
GDL 88 ADS-B
fault. Pressure
altitude input is
invalid.
DATALINK -
GDL 88 ADS-B is
not transmitting
position. Check
GPS devices.
DATALINK -
GDL 88
configuration
module needs
service.
74
Description
The GTN is configured for
a Garmin datalink (GDL
69 or 69A) and the GTN
cannot communicate with
the datalink. Data from
the datalink will not be
available.
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 lost
communication with the
pressure altitude source.
The GDL 88 has detected a
position input fault.
The GDL 88 has detected a
configuration module fault.
GTN 725/750 Cockpit Reference Guide
Action
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
190-01007-04 Rev. L