In aircraft performance, what is defined as a "stall"?

A stall in aircraft performance refers specifically to a condition when the airflow over the wings separates, leading to a significant loss of lift. This typically occurs when the aircraft exceeds a certain angle of attack, causing the airflow to become turbulent and detached from the wing surface. When this happens, the wings can no longer generate sufficient lift to support the weight of the aircraft, which can result in a descent or loss of control.

Understanding this concept is critical for pilots and aircrew, as recognizing the signs of an impending stall and implementing recovery procedures is essential for maintaining safe flight operations. This characteristic of stalls is distinct because it directly relates to the aerodynamic principles governing flight, specifically lift and drag, rather than issues of high-speed behavior or mechanical failures.