Which airspace around smaller airports requires two-way radio communications with ATC prior to entry?

• A. Class B
• B. Class D
• C. Class C
• D. Class E

Answer: (B)

Two-way radio communications with ATC are required in Class D airspace, which surrounds smaller airports with an operational control tower. Before you enter, you must establish contact with ATC on the published frequency and maintain that two-way communication while inside the airspace. This allows ATC to monitor and manage traffic at the airport and provide sequencing and separation as needed. Class E does not require entry communications, and while Class B and Class C do require two-way radio contact, they surround larger, busier airports and aren’t described as around smaller ones. Class D typically extends from the surface up to about 2,500 feet above the airport elevation.