What is the speed limit in Class D airspace below 2500 AGL within 4 nautical miles?

In Class D airspace below 2500 feet AGL within 4 nautical miles of the airport, the speed limit is indeed 200 knots. This regulation is established to ensure safe operations in controlled airspace, particularly near airports where traffic can be congested and where pilots are often transitioning for takeoff and landing.

Maintaining a speed limit of 200 knots allows pilots to have ample time to respond to other traffic and ensures that they can comply with any air traffic control directives more easily. This speed limitation also helps to reduce the noise impact on surrounding communities and supports a smoother flow of air traffic.

The other speed limits do not apply in this specific airspace because they exceed the regulations designed for managing aircraft in close proximity to airports. Different classes of airspace have various speed limits, but in this case, the specific limit for Class D airspace is what makes 200 knots the correct answer.