Hazard Awareness190-02207-02 Rev. B GPS 175/GNX 375 Pilot’s Guide 5-395.19 Terrain AlertingReceive visual alerts for potential flight path conflicts involving terrain, obstacles, orpower lines. Alerting behavior is determined at installation.5.19.1 Alert TypesAvailable alerting functions depend on the installed terrain system.[1] Alerting inhibited <200 ft AGL within 0.5 nm of approach runway or <125 ft AGL within 1.0nm of runway threshold.[2] Alerting inhibited within 0.5 nm of approach runway or <125 ft AGL within 1.0 nm of runwaythreshold. Alerting thresholds for final descent are based on current position, speed, and flightpath data.Terrain Alerting Features• Non-TSO C151c certified terrain alerting system• FLTA functions: RTC, RLC, ROC, ITI, ILI, and IOI• Premature Descent alerts• Terrain depictions and display overlays• Cautions and warnings indicate alert severity and threat type• Textual annunciations• Pop-up alerts• Threat location indication on Terrain page and Map• Self-test and alert inhibit functionalityALERT TYPE CONDITIONImminent Impact[1]Aircraft reaches the minimum clearance altitude of anyobstacle (IOI), terrain (ITI), or power line (ILI) in theprojected flight path.ReducedClearance [1]Aircraft’s vertical flight path is projected to be within theminimum clearance altitude of an obstacle (ROC), terrain(RTC), or power line (RLC).PrematureDescent [2]Aircraft is significantly below the normal approach pathfor the nearest runway.• Altitude is <700 ft above terrain• Distance from destination airport is 15 nm or less
