190-01007-C1
GTN Xi Part 23 AML STC Maintenance Manual
Rev. 1
Page 5-4
Autopilot is not
getting GPSS/Roll
Steering data from
the GTN Xi
(ARINC 429 Roll
Steering used).
GTN Xi does not have a position or
flight plan entered.
Acquire GPS position and enter a flight
plan.
GTN Xi ARINC 429 output not
configured correctly.
Check ARINC 429 output port setting for
port to which the autopilot is connected.
ARINC 429 output port speed not
correct.
Check ARINC 429 output port speed
setting for port that autopilot is
connected to and verify that the speed is
correct for autopilot.
Wiring connections are incorrect.
Check wiring.
Certain autopilots require
groundspeed for GPSS to be
enabled.
Ensure that groundspeed is provided if
required by the autopilot. This can be
accomplished using GTN Xi Demo
mode.
Tuning data not
updating DME.
Incorrect configuration.
Check the DME Channel Mode on the
VOR/LOC/GS CDI
page.
Wiring connections are incorrect.
Check wiring.
Output not configured correctly.
ARINC 429 device is
not receiving data
from the GTN Xi.
GTN Xi ARINC 429 output not
configured correctly.
Check ARINC 429 output port setting for
port that device is connected to.
Receiving LRU ARINC 429 input
port speed not correct.
Check ARINC 429 input port speed
setting for the port that the device is
connected to and verify that the speed is
correct for that device.
Wiring connections are incorrect.
Check wiring.
RS-232 device is not
communicating with
the GTN Xi.
GTN Xi RS-232 port not configured
correctly.
Check RS-232 port setting for the port
that the device is connected to.
Improper setup on the remote
device.
Verify the configuration of the other
device.
Device not compatible or improper
connection.
Verify GTN Xi RX is connected to remote
device TX and GTN Xi TX is connected
to remote device RX.
Multiple TX lines connected
together.
Verify that there is only one TX source
per RX port.
Wiring connections are incorrect.
Check wiring.
Baud rate and parity settings not
set correctly.
Ensure the correct baud rate and parity
settings are selected in Configuration
mode.
CDI scaling on EFS
40/50 is not correct.
On EFS 40/50, (prior to SG465
software version 1501) FMS #1/#2
configuration is not set to
KLN 90-GPS.
Reconfigure EFS 40/50 for KLN 90-GPS
on FMS #1/#2 inputs as appropriate.
Problem
Possible Cause
Corrective Action
