G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Page 5-77
190-00716-01
Revision 1
5.19 GCU 477 Troubleshooting
5.19.1
GCU 477 Alerts and Problems
Failure Message
Cause
Solutions
GCU CNFG – GCU Config error.
Config service req’d.
The G1000 has detected a
GCU 477 configuration
mismatch.
•
Load GCU configuration files.
•
Replace
GCU.
•
If problem persists, replace
master configuration module,
check config module wiring for
faults and replace if necessary.
NOTE
New Terrain/Obstacle cards,
Jeppesen Aviation Database and
other optional features (i.e.
TAWS unlock card) will need to
be replaced if the master
configuration module is changed.
The G1000 System ID number
will change to a new number
when installing a new master
config module. The old Terrain
and other cards will no longer
work as they will remain locked
to the old System ID number.
GCU FAIL – GCU is inoperative.
The G1000 has detected a
failure in the GCU 477.
•
Check wiring for faults (ref Failed
Path troubleshooting section).
•
Replace the GCU 477.
MANIFEST – GCU software
mismatch. Communication halted.
The system has detected an
incorrect software version
loaded in GCU 477.
•
Load the correct software version.
See Section 3.9 for the Software
Load Procedure.
Summary of Contents for Cessna Caravan G1000
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