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 at 250 knots indicated airspeed (KIAS). This limitation is implemented primarily for safety reasons, ensuring that aircraft operating in this busy airspace, often around major airports, maintain manageable speeds that allow for better control and separation from other traffic.

Additionally, maintaining a speed of 250 KIAS below 10,000 feet helps reduce the potential for wake turbulence and contributes to more predictable flight patterns for both arriving and departing aircraft. This speed restriction is part of the regulations established by the Federal Aviation Administration (FAA) to promote safer air traffic management in areas where the density of aircraft can be significant.

The other options present higher operating speeds that are not permitted in Class B airspace below 10,000 feet, as they could increase the risks associated with high-density traffic scenarios.