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What is the meaning of the abbreviation OCA?
  • A
    Obstruction clearance altitude
  • B
    Obstacle clearance altitude
  • C
    Oceanic clearance area
  • D
    Obstacle clearance area

ICAO Doc 8168
Chapter 1 - Definitions

Obstacle clearance altitude (OCA) or obstacle clearance height (OCH). The lowest altitude or 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.

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