What is the general entry requirement for Class D airspace?

• A. ATC acknowledgment is required before entry into Class D airspace.
• B. Two-way communications with the controlling facility; operate with ATC in contact.
• C. No communications are required for VFR entry.
• D. A Mode C transponder is required to enter Class D.

Answer: (B)

Class D airspace is controlled airspace around airports with an operational control tower. For any VFR flight entering that airspace, the key requirement is establishing two-way radio communication with the controlling facility before you enter and staying in that two-way contact while you are inside. This means you must contact the tower (or appropriate ATC) and receive confirmation that you are in communication before you enter, and you should maintain that contact during the entire time you’re in Class D. A transponder with Mode C is not generally required for Class D, unlike in Class B or Class C. IFR operations would require an ATC clearance to enter, but for VFR the essential rule is two-way communication.