Plain English Meaning

Tiny tabs on the back edge of the ailerons that the pilot can adjust to make the airplane stop wanting to roll one way on its own, so they don't have to keep holding the controls against it.

Full Definition

Small adjustable surfaces attached to the trailing edge of the ailerons that, once set by the pilot, hold the ailerons slightly deflected to counteract a steady rolling tendency without the pilot having to maintain pressure on the control wheel or stick.

Context Anchor

Seen in aircraft control-system descriptions, preflight walkarounds, rigging, and discussions of correcting a steady or rolling tendency.