Airspace around an airport with a part-time control tower is Class D during what condition?

• A. During tower operating hours
• B. During IFR operations only
• C. Only at night
• D. Always regardless of tower status

Answer: (A)

Class D airspace is present only when the airport’s control tower is operating. For an airport with a part-time tower, that airspace designation is in effect during the tower’s operating hours. When the tower closes, the airspace reverts to the surrounding class (usually Class E or G), so it is no longer Class D. This is why the correct condition is during tower operating hours. In practice, you’d need two-way radio communication with ATC before entering Class D, and that requirement applies only while the tower is open. Outside those hours, you operate under the other classifications.