Which airspace requires ATC clearance and two-way radio communication to enter?

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

Answer: (A)

The situation tests understanding of entry requirements for different airspace classes. Only the most restrictive controlled airspace around major airports requires both an explicit ATC clearance to enter and two-way radio communication before you penetrate it. This combination is characteristic of Class B airspace, where you must obtain a specific clearance from ATC and maintain continuous two-way communication prior to and while inside.

In contrast, other controlled classes you must establish two-way radio contact with ATC before entry, but you don’t obtain a separate clearance to enter (you’re granted access once comms are established). And some airspace needs no special radio contact at all for standard entry.