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AirspaceQuestion 138 of 934

What does the inner core of a typical Class C airspace area look like?

  1. A 10 NM radius surface area, up to 2,500 feet above the airport elevation
  2. A 5 NM radius surface area, up to 4,000 feet above the airport elevation
  3. A 5 NM radius surface area, up to 10,000 feet MSL
  4. A 4 NM radius surface area, up to 2,500 feet above the airport elevation
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Correct answer: A 5 NM radius surface area, up to 4,000 feet above the airport elevation

The Class C core usually has a 5 NM radius and reaches 4,000 feet above the airport.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 3-2-4 Class C Airspace, page 182

Practice airspace

Questions last reviewed: 18 October 2026