Which airspaces require two-way radio communications with ATC before entry?

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

Answer: (C)

Establishing two-way radio communications with ATC before entering certain controlled airspaces ensures ATC can coordinate, provide instructions, and maintain separation.

For Class C and Class D airspace, you must contact ATC and have two-way communication established before you enter. In Class C, this contact allows ATC to assign a transponder code and guide you through the shelf and core areas. In Class D, you likewise must be in active two-way communication with ATC prior to entry so you can receive the necessary instructions and approvals.

Class E does not require prior ATC contact for entry, and Class A is handled under IFR with an ATC clearance and two-way communications as part of operating in that airspace. The emphasis in this question is on the airspaces that require two-way contact before entry, which are Class C and Class D.