56 G500 Cockpit Reference Guide 190-01102-03 Rev CALERTSALERTSAlertsNOTE: Contact your Garmin dealer for service if any of the followingalerts appear.On Screen AlertsAlert DescriptionAHRS1 GPSAHRS 1 not receiving any GPS information.AHRS 1 is operating exclusively in no-GPS mode.AHRS 1 is using the backup GPS information.AHRS1 SRVC AHRS1 magnetic fi eld model needs update. This appears onthe ground only.AHRS1 TAS AHRS is not receiving true airspeed from ADC.CAL LOST Registry reports that the GDU 620 has lost calibration data.CHECK ATTITUDEThe GDU 620 attitude monitors have detected an AHRSmalfunction, or the inability to actively monitor the AHRSoutput. The autopilot will automatically disconnect. Thisalert will display on the PFD and only appears with theinstallation of an optional GAD 43 Adapter.CNFG MISMATCH GDU 1-2 airframe confi guration settings disagree.CNFG MODULE Failure of confi guration module.DATA LOST Pilot stored data was lost. Recheck data and settings.DIAG MODE System is in Diagnostic Mode.FAN 1/2 FAIL Cooling fan #1 or #2 has failed.GAD 43 Gyro Emulation Type Mismatch FaultYaw Rate Scale Factor Mismatch FaultGDU AHRS Monitor FaultPitch Deviation FaultRoll Deviation FaultYaw Rate Deviation FaultAHRS A429 Attitude Timeout FaultAHRS A429 Attitude Invalid FaultAHRS Pitch Out of Range Fault