What are the general entry requirements for Class C airspace?

• A. Two-way radio communications with ATC and a Mode C transponder; entry typically requires ATC acknowledgment.
• B. No communications required.
• C. Only VFR clearance.
• D. IFR flight only.

Answer: (A)

Class C is a controlled airspace around busy airports that relies on radar surveillance and ATC separation. To enter, you must establish two-way radio communication with ATC on the appropriate frequency and have an operating transponder with altitude reporting (Mode C). ATC will typically acknowledge your transmission and assign a discrete squawk code, and you must maintain two-way communication while inside the airspace. This setup lets ATC identify you on radar and monitor your altitude to keep traffic safely separated, which applies to both VFR and IFR operations (IFR would also involve an explicit clearance). So, entering without being in contact isn’t allowed, and you’re not limited to IFR only; the key requirements are two-way communications and a Mode C transponder with ATC acknowledgment.