System Maintenance Manual GTN 6XX/7XX Part 23 AML STC 190-01007-A1Page 5-16 Rev. 55.3.1.8 Weather Radar AlertsTable 5-10. Weather Radar Alert Troubleshooting GuideDATALINK - GDL 88 CSAFailureThe GDL 88 is reporting to theGTN that the CSA applicationhas failed. Traffic alerting onADS-B traffic is unavailable.Ensure the aircraft has a clearview of the sky.If the problem persists, contactGarmin technical support.DATALINK – GDL 88 externaltraffic system inoperative orconnection lost.The GDL 88 has detected aTAS/TCAS input fault.Refer to the GDL 88 STCInstallation Manual.DATALINK - GDL 88 externaltraffic system has a lowbattery.The GDL 88 is reporting thatthe external traffic system hasa low battery.Refer to the GDL 88 STCInstallation Manual.DATALINK – GDL 88configuration module needsservice.The GDL 88 has detected aconfiguration module fault.Refer to the GDL 88 STCInstallation Manual.DATALINK – GDL 88 needsservice.GDL 88 has detected aninternal fault.Check the GDL 88 Fault pagein configuration mode on theGTN.Refer to the GDL 88 STCInstallation Manual.Alert Text Possible Cause Corrective ActionWX RADAR FAIL – Weatherradar is inoperative.GTN ARINC 708 input port orARINC 429 output notconfigured correctly.Check ARINC 708 port settingfor port 1. Raw ARINC 708data can be viewed on theGTN DIAGNOSTICS - ARINCINPUTS page in configurationmode.Verify that ARINC 429 Out 3 isconfigured for Radar Format 1.Improper setup on the weatherradar.Verify the configuration of theweather radar.Wiring connections areincorrect. Check wiring.Weather radar is reporting asystem fault.Check weather radar statuspage on the GTN inconfiguration mode.Refer to the weather radarinstallation manual.WX RADAR SERVICE –Weather radar needs service.Return unit for repair.Weather radar is reporting asystem failure.Refer to the weather radarinstallation manual fortroubleshooting.Alert Text Possible Cause Corrective Action
