What is the speed limit for aircraft flying below 10,000 feet?

The speed limit for aircraft flying below 10,000 feet is 250 knots indicated airspeed (KIAS). This regulation is established to enhance safety in the lower altitudes where aircraft traffic is denser. The restriction helps to mitigate noise levels for those on the ground and allows air traffic control to manage separation more effectively among aircraft operating in a busy airspace.

This speed limit is particularly important in controlled airspace where numerous aircraft may be converging or departing. By maintaining a standardized speed, pilots can better predict the movement of other aircraft and avoid potential conflicts. Therefore, operating at or below 250 KIAS below 10,000 feet is a critical safety standard in aviation.