What are the general entry requirements for Class D airspace?

• A. Establish two-way communications with the controlling facility; operate with ATC in contact and follow any instructions.
• B. Mode C transponder required.
• C. IFR flight plan required.
• D. No communications required.

Answer: (A)

Class D airspace is a controlled area around airports with operating control towers, and entry is built on being able to talk to ATC. The main requirement is to establish two-way radio communication with the controlling facility before entering the airspace and to stay in communication with ATC while you’re there, following any instructions ATC gives. This ensures ATC can meter traffic, provide clearances, and offer advisories as needed for safe separation. A transponder with Mode C is not required solely to enter Class D, though ATC can request it in certain situations; an IFR flight plan isn’t needed for VFR entry, and you must have communications rather than none at all. If the tower is closed, the airspace reverts to a different classification, which changes entry requirements accordingly.