What is the speed restriction in Class B airspace below 10,000 feet?

In Class B airspace, the speed restriction below 10,000 feet is set to 250 knots indicated airspeed (KIAS). This speed limitation is in place to ensure safe operations in areas that are often congested with air traffic, particularly around major airports. Keeping aircraft at or below this speed helps to reduce the complexity of air traffic management in busy environments, decreasing the risk of wake turbulence and providing required time for air traffic control to manage the flow of aircraft safely.

The 250 KIAS limit is specifically designed to mitigate noise concerns and ensure that all aircraft, including those operating at lower altitudes for approach or departure, can do so within a safe speed envelope. By adhering to this limit, pilots contribute to a safer and more organized airspace structure, which is particularly essential in environments where many airports are located close together.