SurfaceCharacteristics AirportProtectionAreaMarking TouchDownLiftOff RunwayProtectArea TouchDownLiftOffSafeArea ElevatedSurface AirportHeliportProtectionArea

Diagram - Helicopter Surfaces / TLOF Protection Area

Found in AIXM_v.5.1.1.AIXM.AIXM Features.AirportHeliport.Helicopter Surfaces package.

2 - TLOF Protection Area.png