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190-01717-B1 G500/G600 TXi Part 23 AML STC Maintenance ManualRev. 1 Page 4-25Figure 4-16 PFD Alert Message TroubleshootingPFD Fault MessagesIf fault still exists,contact Garmin.HDG FailGPS 1/2 interfacefailed.GPS TIME MARK1/2 FAILImproper installation ofGMU 44 and/or AHRSORExcessive magneticinterferenceThe PFD has notreceived a pulse in3 seconds or moreCausePerform MagneticInterference checkin Section 6.6.4Verify GMU 44and AHRSmounting locationsare within ±3° oflevel and no morethan 6° of eachother(see LRUinstallationinstructions inG500/G600 TxiPart 23 AMLInstallation Manual(P/N:190-01717-B3) for moreinformation)Verify the GPSsource is on andhas a clear view ofthe skyInspect GPSantenna, wiring,and connectionsVerify the GPSsource is on andhas a clear view ofthe skyCorrectiveActionGPS 1/2inoperativeCauseA GPS source haslost communicationORA GPS source isreporting failedCorrectiveActionServiceSoonCauseCorrectiveActionAHRS 1/2 notreceiving GPSaidingThe AHRS hasreported that noGPS data is beingreceivedVerify the GPSsource is on andhas a clear view ofthe skyAHRS 1/2not receivingGPS AidingCauseCorrectiveActionGDU( ) Attitude> GPU monitorrestarted the unit.An internal datacheck has failed andrestarted the GDUGDU( ) GPUmonitorrestarted theunitCauseCorrectiveActionNAV 1/2interface/unitfailedA NAV source haslost communicationORA NAV source isreporting failedIf reporting failed,troubleshoot inaccordance withNAV unitmaintenancemanual.Verify the NAVsource is on andnot reporting failedNAV 1/2inoperativeCauseCorrectiveActionInspect GPSantenna, wiring,and connectionsContact GarminTechnical SupportVerify GDU andGPS configurationsettingsVerify GDU andGPS configurationsettingsInspect GPSantenna, wiring,and connectionsVerify GDU andGPS configurationsettingsInspect NAVwiring,connections, andconfigurationsettingsMaintenanceLog MessageMaintenanceLog MessageMaintenanceLog MessageMaintenanceLog MessageMaintenanceLog Message
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