Definition
A weight attached to a flight control surface, typically forward of its hinge line, used to offset the mass of the surface so that it does not flutter or deflect on its own due to aerodynamic or inertial forces.
Plain English
A small weight built into a moving control surface, like a stabilator or elevator, to keep it balanced around its hinge so it stays steady in flight.
Context Anchor
Seen in discussions of stabilators, elevators, and other movable control surfaces, especially when describing how those surfaces are kept stable and safe in flight.
Derivation
Balance comes from the old idea of two sides of a scale being even. In aviation, the word keeps that same idea: the weight is placed so the control surface is better balanced around the point where it moves.
Why Pilots Care
An unbalanced stabilator can flutter at high speed, causing structural damage or loss of control.
Intuition Check
Do not confuse a balance weight with baggage weight or aircraft weight-and-balance loading. Here, it means a built-in weight used to balance a moving control surface.
Example Sentence 1
The stabilator includes a balance weight ahead of the hinge line to prevent flutter at high airspeeds.
Example Sentence 2
During inspection the mechanic verified that the balance weight on the stabilator had not shifted or corroded.