What is a significant indicator that an airplane may experience a stall?

A significant indicator that an airplane may experience a stall is unusual control feedback during flight. This can manifest as a lack of responsiveness in the control surfaces, where the pilot may feel a change in the way the aircraft responds to inputs. Typically, as an aircraft approaches the critical angle of attack, the control surfaces may begin to behave differently, providing the pilot with feedback that indicates they are nearing a stall condition. This unusual feedback can be experienced as more sluggish or less effective control, prompting the pilot to take corrective action before an actual stall occurs.

Recognizing these early signs of a potential stall allows pilots to take steps to prevent it, such as reducing the angle of attack or increasing airspeed. Awareness of unusual control feedback is critical for maintaining safe flight operations and managing the aircraft's performance effectively.