What is the maximum speed in knots that can be approved without pilot confirmation in Class C or D airspace?

In Class C and D airspace, the maximum speed that can be approved without requiring pilot confirmation is 250 knots. This regulation is primarily aimed at maintaining safety and efficiency within controlled airspace, where aircraft are operating in closer proximity to each other and to the ground.

Setting the limit at 250 knots helps to minimize the risks of wake turbulence and allows for smoother coordination between air traffic control and pilots, particularly during takeoff and approach phases. Class C airspace typically extends from the surface to 4,000 feet above ground level, while Class D airspace usually extends from the surface to a specified altitude, and maintaining a controlled speed helps ensure safe operations.

While speeds above 250 knots can be operationally necessary in certain circumstances, such as during climb or descent outside of controlled airspace, confirmation from the pilot is required before exceeding this limit in Class C or D areas, ensuring that safety remains a priority.