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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 5-3
Autopilot is not
getting GPSS/Roll
Steering data from
the GTN (ARINC 429
Roll Steering used).
GTN does not have a position or
flight plan entered.
Acquire GPS position and enter a flight
plan.
GTN ARINC 429 output not
configured correctly.
Check ARINC 429 output port setting for
port to which 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 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.
GTN 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 port that 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.
GTN RS-232 port not configured
correctly.
Check RS-232 port setting for port that
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 RX is connected to remote
device TX and GTN 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 Config 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