Garmin G1000 Pilot's Manual page 310

APPENDIX A
GRS 77 Message Advisories
Alerts Window Message
AHRS1 TAS – AHRS1 not receiving
airspeed.
AHRS1 GPS – AHRS1 using backup
GPS source.
AHRS1 GPS – AHRS1 not receiving
any GPS information.
AHRS1 GPS – AHRS1 not receiving
backup GPS information.
AHRS1 GPS – AHRS1 operating
exclusively in no-GPS mode.
MANIFEST – GRS1 software mismatch.
Communication halted.
BACKUP PATH – AHRS1 using backup
data path.
AHRS1 SRVC – AHRS1 Magnetic-field
model needs update.
GEO LIMITS – AHRS1 too far North/
South, no magnetic compass.
GMU 44 Message Advisories
Alerts Window Message
HDG FAULT – AHRS1 magnetometer
fault has occurred.
MANIFEST – GMU1 software
mismatch. Communication halted.
A-14
Comments
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 G1000 system should
be serviced.
The #1 AHRS is using the backup GPS path. Primary GPS path has failed. The G1000
system should be serviced when possible.
The #1 AHRS is not receiving any or any useful GPS information. Check AFMS limita-
tions. The G1000 system should be serviced.
The #1 AHRS is not receiving backup GPS information. The G1000 system should be
serviced.
The #1 AHRS is operating exclusively in no-GPS mode. The G1000 system should be
serviced.
The AHRS has incorrect software installed. The G1000 system should be serviced.
The #1 AHRS is using a backup communications data path. The G1000 system
should be serviced when possible.
The #1 AHRS earth magnetic field model is out of date. Update magnetic field model
when practical.
The aircraft is outside geographical limits for approved AHRS operation. Heading is
flagged as invalid.
Comments
A fault has occurred in the GMU 44. Heading is flagged as invalid. The AHRS uses
GPS for backup mode operation. The G1000 system should be serviced.
The GMU 44 has incorrect software installed. The G1000 system should be serviced.
Garmin G1000 Pilot's Guide for the Quest Kodiak 100
190-00590-00 Rev. C