G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Page 5-9
190-00716-01
Revision 1
MFD1 RS-232
Channel LRU
Indicator
Status
CHNL 1
GCU 477
Green
MFD1/GCU 477 data path is functioning correctly.
Red
MFD1/GCU 477 data path is not functioning correctly.
•
Verify GCU 477 is powered on.
o
If GCU 477 will not power on, remove unit and
verify power and ground are present at the GCU
connector.
If power or ground is not present,
troubleshoot aircraft wiring for faults.
If power and ground are present, replace
GCU 477.
•
Load MFD1 and GCU 477 configuration files.
•
Check the MFD1/GCU 477 interconnect wiring for faults.
•
Replace GCU 477.
Replace MFD if problem remains.
Amber
MFD1/GCU data path functionality is unknown. Reload MFD1
configuration file.
Summary of Contents for Cessna Caravan G1000
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