Definition
The protected airspace surrounding an airport within which an aircraft executing a circling approach is guaranteed obstacle clearance, provided it remains at or above the published circling minimum descent altitude. The size of this area depends on the aircraft's approach category (A through E), which is based on its approach speed, with faster categories receiving larger protected areas.
Plain English
It's the zone of safe airspace around an airport where a pilot is allowed to maneuver visually to line up with the runway after flying an instrument approach. As long as the pilot stays inside this zone and at or above the required altitude, they are clear of obstacles like towers, terrain, and buildings.
Context Anchor
Used when briefing or flying a circling approach, especially when the runway you will land on is not straight ahead from the approach path.
Why Pilots Care
Ensures the aircraft remains clear of obstacles during the visual segment of a circling approach.
Grounding Statement
Picture an invisible boundary around the airport: inside it, the approach design accounts for obstacles; outside it, you are on your own for clearance.
Intuition Check
Do not assume the circling area is simply anywhere you can see the airport and make a turn. In instrument procedures, it means a specifically protected area with defined limits.
Example Sentence 1
Because the ceiling forced him low, the pilot kept the airport in sight and stayed well within the circling area while maneuvering to land on Runway 27.
Example Sentence 2
Exceeding the circling area radius during an approach can result in loss of obstacle protection.