User Guide

Garmin G1000 Cockpit Reference Guide for the Cessna Citation Mustang
190-00600-00 Rev. B
63
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out of date.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.