B737Theory - As requested by Andreas here a bit more on the tabs. Flight control balance panels and/or tabs. Aileron The aileron balance panels and tabs are aerodynamically designed to support movement
National Aviation Academy - #Aviation Word of the Day - Servo Tab (aircraft Controls) A small movable tab built into the trailing edge of an aircraft primary control surface. A servo tab
![How do airplane balance tabs (or control tabs) change the force on the pilot's controls? - Aviation Stack Exchange How do airplane balance tabs (or control tabs) change the force on the pilot's controls? - Aviation Stack Exchange](https://i.stack.imgur.com/VKdaZ.jpg)