
Garmin G1000 Cockpit Reference Guide for the Piper PA-28-181 Archer
190-01460-00 Rev. A
82
Annunciations & Alerts
Flight
InstrumentsEIS
Nav/Com/
XPDR/AudioGPS Nav
Flight
PlanningProcedures
Hazard
Avoidance
Additional
Features
Abnormal
OperationAnnun/AlertsAppendixIndex
GRS 77 MESSAGE ADVISORIES
Message Comments
AHRS1 TAS
– AHRS1 not receiving
valid 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.
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The #1 AHRS earth magnetic field model is out of
date.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 system
should be serviced.
MANIFEST
– GMU1 software
mismatch, communication halted.
The GMU 44 has incorrect software installed.
The system should be serviced.
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