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G1000 System Maintenance Manual
Page 5-51
190-00903-00
Rev.
A
5.1.6.12
GMU Advisory Messages
Advisory Message
Possible Cause
Recommended Actions
MANIFEST – GMU1 software
mismatch. Communication
Halted.
The G1000 has detected an
incorrect software version
loaded in GMU 44 #1.
MANIFEST – GMU2 software
mismatch. Communication
Halted.
The G1000 has detected an
incorrect software version
loaded in GMU 44 #2.
Load correct software version in the
GMU44.
HDG FAULT – AHRS1
magnetometer fault has
occurred.
A fault has occurred in GMU
44 #1.
a.
Check GMU 44/GRS 77
interconnect for faults.
b.
Replace GMU 44 #1
c.
If problem persists, replace
GRS 77 #1
HDG FAULT – AHRS2
magnetometer fault has
occurred.
A fault has occurred in GMU
44 #2.
a.
Check GMU 44/GRS 77
interconnect for faults.
b.
Replace GMU 44 #2
c.
If problem persists, replace
GRS 77 #2