Garmin G300 Pilot’s Guide 190-00921-00 Rev. D14System OverviewSystemOverviewFlightInstrumentsEISCOMInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeaturesIntegratedAutopilotAnnun/AlertsAppendixIndexAHRS OperationAttitude/Heading InvalidAHRSno-GPSModeAHRS NormalOperationAHRS no-Mag ModeAHRS no-Mag/no-Air ModeHeading InvalidavailableavailableunavailableunavailableavailableunavailableunavailableavailableleelbleeeeeeeAir DataleeeellbleeeeMagnetometer Dataunavailableavailablelbleeeeeleee GPS DatableeeeeleeeMagnetometer DatableeeeunAir DataLoss of GPS, magnetometer, or air data inputs is communicated to the pilot bymessage advisory alerts. Any failure of the internal AHRS inertial sensors resultsin loss of attitude and heading information (indicated by red ‘X’ flags over thecorresponding flight instruments).If GPS input fails, the AHRS can continue to provide attitude and headinginformation to the PFD as long as magnetometer and airspeed data are availableand valid.If the magnetometer input fails, the AHRS continues to output valid attitudeinformation; however, the heading output on the PFD Page is flagged as invalidwith a red ‘X’.Failure of the air data input has no effect on the AHRS output while AHRS isreceiving valid GPS information. Invalid/unavailable airspeed data in addition toGPS failure results in loss of all attitude and heading information. Likewise, lossof magnetometer (heading) data, in combination with loss of GPS data results ina loss of all attitude and heading information.
