Garmin GTN 650 Series Pilot's Manual Upgrade Supplement page 112

Message
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 -
GDL88 ADS-B is
not transmitting
position. Check
GPS devices.
DATALINK -
GDL88 control
input fault. Check
transponder is in
correct mode.
106
GTN 650/750 Series SW V3.00 Upgrade Supplement 190- 01007-05 Rev A
Description
The GTN is configured
for a Garmin datalink
(GDL 88) 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
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.
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.
Contact dealer for service.