Garmin Software Version 0321.23 Manual Pagina 189

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G1000 System Maintenance Manual – Diamond DA40/40F Page 5-57
190-00545-01 Revision G
AHRS1 GPS – AHRS1 using
backup GPS source.
The GRS 77 is using the backup
GPS data path.
GPS antenna and cabling.
9 If problem persists replace
associated GIA.
Check RS-232 configuration settings for
the GIA 63/GIA 63Ws:
9 If configuration is not correct,
reconfigure.
Check GRS/GIA interconnect.
9 Replace the GRS 77
MAG VAR WARN – Large
magnetic variance. Verify all
course angles.
Magnetic variance value from
GMU 44 is not accurate.
If problem persists, run magnetic
interference check in Section 7.7.2 to
check for localized magnetic
interference.
5.13.3 GMU Alerts
Table 5-48. GMU Alerts
Failure Message Cause Solutions
MANIFEST – GMU1 software
mismatch. Communication
Halted.
The system has detected an
incorrect software version loaded
in GMU 44.
Load correct software version. See
Section 3.5 for the software load
procedure.
HDG FAULT – AHRS1
magnetometer fault has occurred.
A fault has occurred in the
magnetometer; heading will be
flagged invalid.
Check GMU 44/GRS 77 interconnect.
Replace the GMU 44.
9 If problem persists, replace the
GRS 77.
5.14 GDC 74A Troubleshooting
5.14.1 Air Data Common Problems
Table 5-49. Air Data Common Problems
Symptom Recommended Action
Altitude is different than standby
altimeter
Perform a pitot/static check per Section 7.6.2 of this manual. Allow the GDC
to warm up for fifteen minutes before checking accuracy, per Garmin Service
Advisory 0606.
Determine which instrument is outside limits and replace. The GDC is not
field adjustable. Note: Both units may individually be in spec but show a
difference in altitude. Do not return the GDC to Garmin for service if not
outside limits.
5.14.2 GDC Alerts
Table 5-50. GDC Alerts
Failure Message Cause Solutions
MANIFEST – GDC1 software
mismatch. Communication
Halted.
The system has detected an
incorrect software version loaded
in GDC 74A.
Load correct software version. See
Section 3.5 for the software load
procedure.
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