The radius of the procedural outer area of Class C airspace is normally
A
10 NM.
B
20 NM.✓ Correct Answer
C
30 NM.
Explanation
AIM 3-2-4 describes the Class C outer area as a procedural area whose normal radius is 20 NM from the primary airport, where approach control provides services to participating aircraft. The 10 NM figure is the normal radius of the Class C shelf area, and 30 NM is the Class B Mode C veil, not a Class C dimension.
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