What is the speed limit within 4 NM of a Class C or D airport below 2500' AGL?

The speed limit within 4 nautical miles of a Class C or D airport below 2,500 feet AGL is 200 knots. This regulation is in place to ensure safety and minimize the risk of wake turbulence for aircraft operating in the vicinity of airports, where air traffic is often denser. The lower speed limit allows for better control during takeoff and landing phases, which are critical times in an aircraft’s operation.

This regulation is stipulated in the Federal Aviation Regulations (FAR), which highlight the importance of managing airspeed in areas with increased traffic and heightened operational complexity. It helps maintain the flow of traffic and promotes safety for both aircraft and ground operations in these busy airspace environments.

Gradual adherence to these speed limits helps pilots remain aware of their surroundings, as well as the potential for rapid changes in air traffic density, which is often experienced near airports. Thus, the correct answer is rooted in the need for safety in congested airspace and aligns with operational guidelines.