Off-Route Obstruction Clearance Altitude

From EUROCONTROL ATM Lexicon
Jump to: navigation, search
Link Semantic Value
Term Off-Route Obstruction Clearance Altitude
Status


Mandatory for


Contexts


Categories
Synonyms


Related entries


Broader term


Narrower term


Abbreviation

  • OROCA

Definition

An altitude which provides obstruction clearance with a 1000 foot buffer in non-mountainous terrain areas and a 2000 foot buffer in designated mountainous areas when operating outside the established airway structure.

Definition Source

  • AIFDD

Note

This altitude may not provide signal coverage from ground-based navigational aids, air traffic control radar, or communications coverage.