What is the normal radius of the procedural outer area of Class C airspace?

What is the normal radius of the procedural outer area of Class C airspace?

• A. 15 nautical miles
• B. 20 nautical miles
• C. 25 nautical miles
• D. 30 nautical miles

Answer: (B)

Class C airspace has multiple nested layers, with an outer area that extends beyond the main ring around the airport. The outer shelf sits from about 5 to 10 NM and up to 4,000 ft AGL, but beyond that there’s a procedural outer area that reaches further out. This outer area is still Class C, but it’s managed by procedures rather than radar control, so pilots must establish two‑way radio communication with ATC before entering and must squawk the assigned code. The normal radius of this procedural outer area is 20 nautical miles from the primary airport.

Class C airspace has multiple nested layers, with an outer area that extends beyond the main ring around the airport. The outer shelf sits from about 5 to 10 NM and up to 4,000 ft AGL, but beyond that there’s a procedural outer area that reaches further out. This outer area is still Class C, but it’s managed by procedures rather than radar control, so pilots must establish two‑way radio communication with ATC before entering and must squawk the assigned code.

The normal radius of this procedural outer area is 20 nautical miles from the primary airport.