Definition
The protected airspace surrounding an instrument procedure segment within which the FAA guarantees a specified minimum clearance above terrain and man-made obstacles. As long as the aircraft remains inside this area at or above the published minimum altitude, required obstacle clearance is assured.
Plain English
A protected zone around the flight path of an instrument procedure where the published altitude keeps you safely above the ground and any obstacles. Stay inside the zone and at or above the altitude, and you will not hit anything.
Context Anchor
Seen in instrument approach and procedure turn discussions, especially when explaining the protected space around the published maneuver.
Why Pilots Care
It tells the pilot exactly where the published altitudes keep the aircraft safely separated from obstacles during the turn.
Grounding Statement
In a procedure turn, the obstruction clearance area is the planned safe zone around the maneuver, not just the exact line drawn on the chart.
Intuition Check
Do not read “clearance” here as an ATC permission, and do not assume the area is empty. It means the procedure is designed to provide safe vertical space above obstacles if flown as published.
Example Sentence 1
The procedure turn must be completed within 10 NM of the fix to remain inside the obstruction clearance area.
Example Sentence 2
Reviewing the approach plate showed that the obstruction clearance area extended several miles on either side of the inbound course.