ObstacleFreeZone

urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ObstacleFreeZone

The airspace above the inner approach surface, inner transitional surfaces, and balked landing surface and that portion of the strip bounded by these surfaces, which is not penetrated by any fixed obstacle other than a low-mass and frangibly mounted one required for air navigation purposes.

Source: ICAO Annex 1,ICAO Annex 14,ICAO Annex 4,
Abbreviations: OFZ


Related:
not penetrated by Obstacle