FAA Ground School Practice Test

When is airspace at an airport with a part-time control tower classified as Class D?

1. When the tower is operational

2. When the tower is closed

3. At all times, regardless of operation

4. Only during peak hours

The correct answer is: When the tower is operational

Airspace at an airport with a part-time control tower is classified as Class D when the tower is operational. The classification as Class D airspace is directly tied to the presence of air traffic control services, which are provided only when the control tower is active. During these operational hours, pilots are required to establish communication with the tower before entering the airspace. Once the tower closes, typically during non-operational hours, the airspace reverts to a classification that may not include the same procedural requirements as Class D, such as Class E or uncontrolled airspace where communication with ATC is not mandatory. It is critical for pilots to be aware of these operational times to ensure compliance with airspace regulations, especially when navigating in and around airports with part-time control towers.