Garmin Diamond DA40, Maintenance Manual

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G1000/DA40 System Maintenance Manual Page 5-23
190-00303-03 Revision 6
5.12 GDC 74A Troubleshooting
5.12.1 GDC Alerts
Failure Message Cause Solutions
MANIFEST – GDC1 software
mismatch. Communication
Halted. The system has detected an
incorrect software version loaded
in GDC 74A.
•
Reload software. See
Section 7 for GDC 74A Software
Load Procedure.
BACKUP PATH – Airdata using
backup data path. The GDC 74A is using a backup
ARINC 429 data path.
Check ARINC 429 configuration
settings at GDU and GIA page
groups:
9 If configuration is not correct,
reconfigure GIA or GDU as
described in Section 7.
Check wiring.
Replace PFD1 with a known good unit,
to verify location of problem:
9 If problem persists, replace the
GDC 74A.
9 If problem does not persist,
replace PFD1.
GDC 74A
ARINC 429
ETHERNET
ETHERNET
ETHERNET
ETHERNET
ARINC 429
ETHERNET
ETHERNET
ARINC 429
ARINC 429
No. 1 No. 2
GIA 63
GIA 63
Primary Data Path
Secondary Data Path
Third Data Path
Fourth Data Path
GDC 74A
GDC 74A GDC 74A
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
No. 1
GDU 1040
PFD
No. 1
GDU 1040
MFD
Figure 5-11. GDC 74A Data Paths