Grs 77 Data Paths - Garmin G1000 NAV III Line Maintenance Manual

2.5.5 Backup Path Alerts
Message
BACKUP PATH – AHRS using
backup data path.
2.5.6 GMU Related Alerts
Message
MANIFEST – GMU1 software
mismatch. Communication
Halted.
HDG FAULT – A
magnetometer fault has
occurred.
Page 2-58
Rev. L
Cause
The PFD is using a backup
ARINC 429 data path to
receive AHRS data.
Figure 2-20. GRS 77 Data Paths
Cause
The system has detected an
incorrect software version
loaded in the GMU 44.
A fault has occurred in the
magnetometer.
Solutions
See Section 2.1.5 for
o
troubleshooting.
Solutions
•
Load correct software version in the
GMU 44.
•
Check GMU 44/GRS 77 interconnect
for faults.
•
Replace the GMU 44.
If problem persists, replace the
o
GRS 77.
G1000 Nav III Line Maintenance Manual
190-00352-00