
Garmin G1000 Cockpit Reference Guide for the Cessna Citation Mustang
190-00600-01 Rev. C
69
Annunciations & Alerts
GRS 77 Message Advisories (Cont.)
Message Comments
AHRS2 SRVC
– AHRS2 Magnetic-
field model needs update.
The #2 AHRS earth magnetic field model is
out of date. Update magnetic field model
when practical.
GEO LIMITS
– AHRS1 too far North/
South, no magnetic compass.
The aircraft is outside geographical limits
for approved AHRS operation. Heading is
flagged as invalid.
GEO LIMITS
– AHRS2 too far North/
South, no magnetic compass.
MANIFEST
– GRS1 software
mismatch, communication halted.
The #1 AHRS has incorrect software installed.
The G1000 system should be serviced.
MANIFEST
– GRS2 software
mismatch, communication halted.
The #2 AHRS has incorrect software installed.
The G1000 system should be serviced.
GMU 44 Message Advisories
Message Comments
HDG FAULT
– AHRS1 magnetometer
fault has occurred.
A fault has occurred in the #1 GMU 44.
Heading is flagged as invalid. The AHRS uses
GPS for backup mode operation. The G1000
system should be serviced.
HDG FAULT
– AHRS2 magnetometer
fault has occurred.
A fault has occurred in the #2 GMU 44.
Heading is flagged as invalid. The AHRS uses
GPS for backup mode operation. The G1000
system should be serviced.
MANIFEST
– GMU1 software
mismatch, communication halted.
The GMU 44 has incorrect software installed.
The G1000 system should be serviced.
MANIFEST
– GMU2 software
mismatch, communication halted.
GDL 69A Message Advisories
Message Comments
GDL69 CONFIG
– GDL 69 config
error. Config service req’d.
GDL 69 configuration settings do not match
those of backup configuration memory. The
G1000 system should be serviced.
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