Definition
An expanded segment of protected airspace built into an instrument procedure where the aircraft is expected to change course, providing additional obstacle clearance to account for the wider ground track flown during the turn.
Plain English
When an instrument procedure has a turn in it, the protected airspace gets wider at that turn. That wider piece is called the turning area. It exists because aircraft swing out a bit when they turn, so the protected zone has to grow to keep them safely clear of obstacles.
Context Anchor
Seen in instrument procedure design and en route obstacle clearance discussions, especially where an airway or route changes direction at a fix.
Derivation
“Turn” comes through Old French from a Latin word meaning to rotate or move around. “Area” means a space. In this FAA context, the “area” is not a patch of ground; it is protected airspace used during the turn.
Why Pilots Care
It defines the protected airspace needed to safely change direction without risking collision with terrain or obstacles.
Intuition Check
Do not read “turning area” as a place on the ground where an aircraft turns around. Here it means protected airspace around an IFR course change.
Example Sentence 1
The chart designer expanded the turning area at the missed approach holding fix to ensure obstacle clearance during the course reversal.
Example Sentence 2
En route procedures mark turning areas around fixes so the aircraft can safely change heading.