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Trim Tab

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Trim tabs are small, secondary flight control surfaces that are connected to the trailing edge of a larger, primary control surface such as an elevator or rudder. The trim tab is used to "trim" or counteract the aerodynamic force on the control surface and thus stabilise the aircraft in the axis of rotation associated with the primary control. Trim tabs can be either flight adjustable or fixed.

By adjusting the angle of the trim tab relative to the larger control surface, the neutral position of the control surface is changed. This occurs because the distance from the control surface hinge or arm at which the trim tab is mounted provides sufficient [[Moment|moment] to move the larger surface.

On a light, single engine aircraft, a fixed tab can be bent (on the ground) to the desired position to overcome any unwanted roll or yaw tendencies. The position of an adjustable trim tab on any of the primary flight control surfaces can be changed in flight, using cockpit controls, to counter any change in control loading caused by airspeed, centre of gravity or aircraft configuration.

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