Definition
A noticeable shaking or vibration of the airframe, control surfaces, or controls that occurs as the wing approaches its critical angle of attack, caused by turbulent, separated airflow coming off the upper wing surface and striking the tail or other downstream structures. It is one of the earliest aerodynamic warnings that a stall is imminent.
Plain English
It is a shudder or shake the pilot can feel through the airframe and controls just before the wing stops producing enough lift. It is the airplane's natural way of warning the pilot that a stall is about to happen.
Context Anchor
You encounter this term when learning how to recognize an approaching stall by feel, sound, and airplane behavior.
Derivation
Buffet' comes from the Old French 'buffeter,' meaning to strike or beat repeatedly. The word captures what the disturbed airflow is actually doing to the tail and airframe: striking it in irregular pulses. 'Pre-stall' simply means before the stall occurs.
Why Pilots Care
It gives a clear physical warning that a stall is about to occur, allowing the pilot to lower the nose and restore smooth airflow before control is lost.
Grounding Statement
A pilot may feel pre-stall buffeting as a light-to-strong shudder through the seat, controls, or airframe while the airplane is flying too slowly or at too high a nose attitude.
Intuition Check
Pre-stall does not mean the airplane has already stalled; it means the stall is close. Buffeting here does not mean a meal or ordinary rough air; it means shaking caused by disturbed airflow near a stall.
Example Sentence 1
As the airplane slowed during the power-off stall demonstration, the student felt the pre-stall buffeting through the control yoke and immediately lowered the nose to recover.
Example Sentence 2
The pilot noticed pre-stall buffeting increase while turning base and reduced the bank angle to keep the wings flying.