FAA Ground School Practice Test

What is the vertical limit of Class C airspace above the primary airport?

1. 2000 feet AGL

2. 3000 feet AGL

3. 4000 feet AGL

4. 5000 feet AGL

The correct answer is: 4000 feet AGL

Class C airspace typically extends from the surface up to 4,000 feet above ground level (AGL) surrounding the primary airport. The design of Class C airspace is aimed at managing the higher density of air traffic that often exists around busy airports, which includes both arriving and departing aircraft. The configuration generally consists of a core area with a radius of about 5 nautical miles, extending from the surface to 4,000 feet AGL, accompanied by an outer area with a radius extending to 10 nautical miles that starts at a higher altitude, usually from 1,200 feet AGL. This vertical structure allows for controlled airspace that ensures safety for both VFR (Visual Flight Rules) and IFR (Instrument Flight Rules) operations in proximity to the airport. This is why the vertical limit of Class C airspace above the primary airport is accurately identified as 4,000 feet AGL.