Within 5 miles of Barnes County Airport, the airspace from the surface up to 700 feet AGL is which class?

Within 5 miles of Barnes County Airport, the airspace from the surface up to 700 feet AGL is which class?

• A. Class E from surface to 700 feet AGL
• B. Class B from surface to 10,000 feet MSL
• C. Class D from surface to 700 feet AGL
• D. Class G from surface to 700 feet AGL

Answer: (D)

The key idea is how Class G and Class E are laid out around airports. Class G is uncontrolled airspace from the surface up to the base of the overlying Class E. If the base of Class E near an airport is 700 feet AGL, then from the surface to 700 feet AGL is Class G. So around Barnes County Airport, there isn’t a surface-level Class E area or a control tower indicated that would create a higher, controlled surface layer. That means the airspace from the surface up to 700 feet AGL remains Class G, i.e., uncontrolled. Choices implying Class E from the surface, or Class B/C, or a Class D surface area would require a surface-based Class E (or a tower-controlled) structure at that airport, which isn’t indicated here. Above 700 feet AGL, the airspace becomes Class E until the next change in the airspace structure.

The key idea is how Class G and Class E are laid out around airports. Class G is uncontrolled airspace from the surface up to the base of the overlying Class E. If the base of Class E near an airport is 700 feet AGL, then from the surface to 700 feet AGL is Class G.

So around Barnes County Airport, there isn’t a surface-level Class E area or a control tower indicated that would create a higher, controlled surface layer. That means the airspace from the surface up to 700 feet AGL remains Class G, i.e., uncontrolled.

Choices implying Class E from the surface, or Class B/C, or a Class D surface area would require a surface-based Class E (or a tower-controlled) structure at that airport, which isn’t indicated here. Above 700 feet AGL, the airspace becomes Class E until the next change in the airspace structure.