OCH v.s OCA (Height v.s Altitude)

[Ref. ACE The Technical Pilot Interview 5090/6496]

Concept of “Height” and Altitude – #click here~

OCH
– obstacle clearance height about the aerodrome level – refer to QFE setting.

OCA
– obstacle clearance altitude about mean sea level (MSL) – refer to QNH setting

Warning: QNH  QNE

 

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