What must be done upon receiving an approach clearance while on a speed assignment?

Upon receiving an approach clearance while on a speed assignment, the appropriate action is to change to the cleared approach speed. This is important because the clearance indicates the speed mandated by Air Traffic Control (ATC) for safely managing traffic flow, especially during approach and landing phases. Complying with the cleared approach speed facilitates a smoother airspace operation, ensuring that aircraft enter the landing pattern in an orderly manner with appropriate spacing, maintaining safety and efficiency.

While maintaining the assigned speed or consulting with ATC might seem reasonable, they do not align with the directive given in the clearance itself. Slowing to a specific speed, like 200 KIAS, might not be appropriate unless that speed is specified in the clearance. Therefore, the correct action is to adjust the aircraft’s speed to adhere strictly to the instructed approach speed, ensuring compliance with ATC instructions.