What is a distinct characteristic of a stall?

A distinct characteristic of a stall is the decrease in control effectiveness. This occurs when the airflow over the wings reaches a critical angle of attack, leading to a significant reduction in lift and an increase in drag. As the aircraft approaches a stall condition, the control surfaces, particularly the ailerons and elevators, become less effective, making it increasingly difficult for the pilot to maintain control of the aircraft. This decrease in control effectiveness can result in unintended yaw or roll, which can be critical during flight if not managed properly. Understanding this characteristic is fundamental for pilots, as recognizing the onset of a stall and responding appropriately is key to ensuring flight safety.