What is the maximum airspeed below 10,000 feet?

The maximum airspeed below 10,000 feet is 250 knots. This regulation is established by the Federal Aviation Administration (FAA) in the United States, specifically outlined in FAR (Federal Aviation Regulations) part 91.117. The purpose of this limitation is to maintain safety and reduce noise pollution in the vicinity of airports and populated areas, as well as to ensure orderly traffic in busy airspace. By setting this speed limit, the FAA aims to enhance the safety of flight operations by minimizing the potential for accidents that can arise from excessive speed in crowded airspace.

Flying at or below this speed helps pilots maintain better control and situational awareness when operating in lower altitudes, where ground features and other aircraft may be more challenging to navigate. It also aligns with the need for various aircraft to operate within a manageable and safe environment, particularly during takeoff and landing phases.