Glossary

Look up acronyms, technical terms and phrases to find out what they mean.

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OBSTR

Definition
Obstruction
Glossary Safety

OC

Definition
Operating Certificate
Glossary Certification

OCA

Definition
Oceanic Control Area
Glossary Meteorology Air traffic control

OCA

Definition
Obstacle Clearing Altitude
Glossary Flight planning

OCC

Definition
Occulting (light)
Glossary Meteorology

OCH

Definition
Obstacle Clearance Height
Glossary Measurement

OCNL

Definition
Occasional, Occasionally
Glossary Meteorology

OCTA

Definition
Outside Control Area
Glossary Navigation

OCTR

Definition
Outside Control Zone
Glossary Navigation

OEI

Definition
One Engine Inoperative
Glossary Measurement Source: AIS
Online version available at: https://www.casa.gov.au//resources-and-education/glossary
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