Garmin G3X Pilot’s Guide 190-01115-00 Rev. KAppendix F422SystemOverviewFlightInstrumentsEISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeaturesAFCSAnnun/AlertsAppendixIndexREVERSIONARY MODE (FULL-SCREEN)In the event of a display failure, the G3X System automatically switches toreversionary (backup) mode. In reversionary mode, the information is presented onthe remaining display in the split-screen configuration.If a display failure occurs with the GDU 375, the WX and XM Pages will no longerbe available since the XM receiver resides in the GDU 375.G3X Full-Screen Reversionary Mode (Failed PFD)AFCS REVERSIONARY MODEIn a two display system, in the event of a PFD failure, the MFD goes into reversionarymode, and the autopilot is disengaged. If the MFD fails, the PFD goes into reversionarymode and the autopilot continues to function.In a GMC 305 installation, in the event of display failure(s), basic autopilotfunctionality remains as long as a ADAHRS unit is still available. The FD is no longeravailable, but LVL, AP, ALT, and YD are available.FAILURE OF THE EXTERNAL GPS NAVIGATION SOURCEIf the external GPS navigation source fails, the system reverts to the internal GPSnavigation source and ‘REV’ is shown in yellow in the upper left corner of the Data Baras well as the lower left quadrant of the HSI.
