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obstacle free zone
avia.	зона, вільна від перешкод; вільна від перешкод зона
English thesaurus
obstacle free zone
avia., Canada	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