Definition
The maximum speed at which the airplane's flight controls may be moved abruptly to their full deflection, or at which the airplane may be flown into severe turbulence, without exceeding the design load limit. Below VA, the wing will stall before structural limits are exceeded; above VA, full control inputs or strong gusts can overstress the airframe.
Plain English
The fastest speed at which you can fully and abruptly move the controls, or fly into rough turbulence, without risking damage to the airplane. Slow down to this speed or below when the air gets rough.
Context Anchor
Pilots see VA in the airplane’s flight manual or operating handbook, especially when planning for turbulence, training maneuvers, or any situation where sudden control movement may occur.
Derivation
VA comes from 'velocity' (V) and 'maneuvering' (A, from the engineering convention for maneuvering speed). The 'V-speeds' are a standardized set of airspeeds defined for design and operational reference.
Why Pilots Care
Exceeding VA in turbulence or during abrupt maneuvers can cause structural damage or failure.
Intuition Check
Do not think of VA as one fixed speed that is always safe. VA changes with weight: when the airplane is lighter, VA is lower.
Example Sentence 1
As the ride got bumpy crossing the ridge, she pulled the throttle back and slowed to VA before the next gust hit.
Example Sentence 2
Full aileron deflection is permitted only below VA to avoid overstressing the wings.