Definition
The protected airspace surrounding an airport within which obstacle clearance is guaranteed for an aircraft executing a circling maneuver from an instrument approach. The radius of this area is determined by the aircraft's approach category, which is based on the aircraft's reference landing speed (1.3 times stall speed in landing configuration at maximum certificated landing weight).
Plain English
An invisible zone of safe airspace drawn around the runways of an airport. As long as a pilot stays inside this zone while circling to line up for landing, they are guaranteed to clear all obstacles like towers, terrain, and buildings. Faster aircraft need a bigger zone because they can't turn as tightly, so the size of the zone depends on how fast the aircraft is flying.
Context Anchor
Seen in instrument approach planning, especially when checking aircraft approach category and circling minimums.
Why Pilots Care
Defines the exact area where obstacle protection is guaranteed during a circling maneuver, preventing controlled flight into terrain.
Analogy
Think of it like a marked safe working zone around the airport. Inside the zone, the procedure has been designed with obstacles in mind; outside it, you are no longer relying on that same protection.
Grounding Statement
During a circling approach, the pilot is close to the airport, low to the ground, and turning visually to reach the landing runway.
Intuition Check
Do not read this as just any area where an airplane happens to circle. In instrument procedures, the circling approach area is a defined protected area used to set the published circling minimums.
Example Sentence 1
Because the airport sat in a valley with rising terrain to the north, the pilot stayed inside the circling approach area and kept the runway in sight throughout the maneuver.
Example Sentence 2
If the aircraft drifts outside the circling approach area, the pilot must immediately begin the missed approach.