obstacle clearance height

obstacle clearance height; OCH
(...) the lowest height above the elevation of the relevant runway threshold or the aerodrome elevation as applicable, used in establishing compliance with appropriate obstacle clearance criteria.
(...) obstacle clearance height is referenced to the threshold elevation or in the case of non-precision approaches to the aerodrome elevation or the threshold elevation if that is more than 2 m (7 ft) below the aerodrome elevation. An obstacle clearance height for a circling approach is referenced to the aerodrome elevation.
(AN 4; AN 6/I; PANS-OPS/II)
относительная высота пролёта препятствий; OCH
(...) минимальная относительная высота над превышением соответствующего порога ВПП или, в соответствующих случаях, над превышением аэродрома, используемая для обеспечения соблюдения соответствующих критериев пролёта препятствий.

International Civil Aviation Vocabulary (English-Russian). 2014.

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