Cockpit Reference Guide

Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
190-00384-11 Rev. A
13-20
SECTION 13 – ANNUNCIATIONS
& ALERTS
GRS 77 Message Advisories
Message Comments
AHRS1 TAS – AHRS1 not receiving
airspeed.
The #1 AHRS is not receiving true airspeed from the air data computer. The AHRS
relies on GPS information to augment the lack of airspeed. The system should be
serviced.
AHRS1 GPS – AHRS1 using backup
GPS source.
The #1 AHRS is using the backup GPS path. Primary GPS path has failed. The
system should be serviced when possible.
AHRS1 GPS – AHRS1 not receiving
any GPS information.
The #1 AHRS is not receiving any or any useful GPS information. Check AFMS
limitations. The system should be serviced.
AHRS1 GPS – AHRS1 not receiving
backup GPS information.
The #1 AHRS is not receiving backup GPS information. The system should be serviced.
AHRS1 GPS – AHRS1 operating
exclusively in no-GPS mode.
The #1 AHRS is operating exclusively in no-GPS mode. The system should be
serviced.
AHRS MAG DB – AHRS magnetic
model database version mismatch.
The #1 AHRS and #2 AHRS magnetic model database versions do not match.
AHRS1 SRVC – AHRS1 Magnetic-
field model needs update.
The #1 AHRS earth magnetic field model is out of date.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.
MANIFEST – GRS1 software
mismatch, communication halted.
The #1 AHRS has incorrect software installed. The 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.
MANIFEST – GMU1 software
mismatch, communication halted.
The GMU 44 has incorrect software installed. The G1000 system should be
serviced.