Home › attribute › och
Obstacle Clearance Height (OCH) (OCH)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: och.ttl
- Name
obstacleClearanceHeight- Datatype
- Real
- Definition
- 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.
- Description
- 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 metres (7 feet) below the aerodrome elevation. An obstacle clearance height for a circling approach is referenced to the aerodrome elevation.
- Synonyms
- OCH
- Accepted
- 2013-10-18
- Defined by
- DFDD
- Physical quantity
- length
- Recommended unit
- Metre (m)
- Used by
- GA215 Terminal Instrument Procedure Minima
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.