Garmin G900X Pilot's Manual - page 452
Garmin G900X Pilot’s Guide
190-00726-00 Rev. A
A-12
APPENDIX A
GRS 77 ATTITUDE AND HEADING REFERENCE SYSTEM
Message Advisory
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 G900X 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 G900X
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 G900X system should be serviced.
AHRS1 GPS
– AHRS1 not receiving
backup GPS information.
The #1 AHRS is not receiving backup GPS information. The G900X system should be
serviced.
AHRS1 GPS
– AHRS1 operating
exclusively in no-GPS mode.
The #1 AHRS is operating exclusively in no-GPS mode. The G900X 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The #1 AHRS earth magnetic field model is out of date.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 G900X system should be serviced.
GDL 69A SATELLITE DATALINK RECEIVER (OPTIONAL)
Message Advisory
Comments
GDL69 CONFIG
– GDL 69 config
error. Config service req’d.
GDL 69 configuration settings do not match those of backup configuration memory.
The G900X system should be serviced.
GDL69 FAIL
– GDL 69 has failed.
A failure has been detected in the GDL 69. The receiver is unavailable. The G900X
system should be serviced.
MANIFEST
– GDL software mismatch,
communication halted.
The GDL 69 has incorrect software installed. The G900X system should be serviced.
GCU 476 PFD/MFD CONTROL UNIT (OPTIONAL)
Message Advisory
Comments
GCU CNFG
– GCU Config error.
Config service req’d.
GCU 476 configuration settings do not match those of backup configuration memory.
The G900X system should be serviced.
GCU FAIL
– GCU is inoperative.
A failure has been detected in the GCU 476. The GCU 476 is unavailable.
MANIFEST
– GCU software mismatch,
communication halted.
The GCU 476 has incorrect software installed. The G900X system should be serviced.