Garmin G900X Pilot's Manual page 663

GMU 44 MESSAGE ADVISORIES
Message
HDG FAULT – AHRS1 magnetometer
fault has occurred.
HDG FAULT – AHRS2 magnetometer
fault has occurred.
MANIFEST – GMU1 software
mismatch, communication halted.
MANIFEST – GMU2 software
mismatch, communication halted.
GDL 69A MESSAGE ADVISORIES (OPTIONAL)
Message
GDL69 CONFIG – GDL 69 config
error. Config service req'd.
GDL69 FAIL – GDL 69 has failed.
MANIFEST – GDL software mismatch,
communication halted.
GDC 74A MESSAGE ADVISORIES
Message
ADC1 ALT EC – ADC1 altitude error
correction is unavailable.
ADC2 ALT EC – ADC2 altitude error
correction is unavailable.
ADC1 AS EC – ADC1 airspeed error
correction is unavailable.
ADC2 AS EC – ADC2 airspeed error
correction is unavailable.
MANIFEST – GDC1 software
mismatch, communication halted.
MANIFEST – GDC2 software
mismatch, communication halted.
GCU 476/477 MESSAGE ADVISORIES (OPTIONAL)
Message
GCU CNFG – GCU Config error.
Config service req'd.
GCU FAIL – GCU is inoperative.
190-00726-00 Rev. J
Comments
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.
A fault has occurred in the #2 GMU 44. Heading is flagged as invalid. The AHRS uses
GPS for backup mode operation. The system should be serviced.
The GMU 44 has incorrect software installed. The system should be serviced.
Comments
GDL 69 configuration settings do not match those of backup configuration memory.
The system should be serviced.
A failure has been detected in the GDL 69. The receiver is unavailable. The system
should be serviced
The GDL 69 has incorrect software installed. The system should be serviced.
Comments
GDC1 or GDC2 is reporting that the altitude error correction is unavailable.
GDC1 or GDC2 is reporting that the airspeed error correction is unavailable.
The GDC 74A has incorrect software installed. The system should be serviced.
Comments
GCU 476/477 configuration settings do not match those of backup configuration
memory. The system should be serviced.
A failure has been detected in the GCU 476/477. The GCU 476/477 is unavailable.
Garmin G900X Pilot's Guide
APPENDIX A
647