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| 超障净空高度; 越障高度; 障碍间隔高度 (相关的跑道人口或可用的机场的标高以上的最低高度,其使用符合适当的障碍间隔准则。OCA 可以参考平均海平面,QCH 可以参考对人口标高，或者在非精确进近情况下，参考机场标高或者人口标高度 (如果这个高度低于机场标高不超过2m即7ft)。盘旋进近的 QCH 以机场标高为参考。为方便起见，当两种表达都使用时，可写为"obstacle clearance altitude/height"或简写为“OCA/H”) | |||
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| The lowest height above the elevation of the relevant runway threshold or above the aerodrome elevation, as applicable, used in establishing compliance with appropriate obstacle clearance criteria. • see also : obstacle clearance altitude | |||
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