What is the typical top altitude of Class D airspace that is given to radar controllers?

• A. 2500 ft AGL; Top 500 ft
• B. 3000 ft AGL; Top 1000 ft
• C. 3500 ft AGL; Top 1500 ft
• D. 1500 ft AGL; Top 200 ft

Answer: (A)

Class D airspace is defined from the surface up to a ceiling of 2,500 feet above the airport. That ceiling is the altitude up to which radar services are typically provided for aircraft operating in that area, with control transitioning to other airspace classifications above it. So the height to remember is 2,500 feet above the airport (2,500 ft AGL at the airport), which is why that top value is the correct one. Lower ceilings shown in the other options don’t match how Class D is defined, since they wouldn’t encompass the standard radar-controlled segment around many towered airports.