obstruction clearance line

obstruction clearance line
условная наклонная линия, ограничивающая высоту препятствий (на полосе воздушных подходов)

Англо-русский словарь по авиационным и ракетным базам. - М.: Военное издательство министерства обороны Союза ССР. . 1962.

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