What does a spring tab operate on?

A spring tab operates on mechanical springs. This device is designed to help control the movement of control surfaces, such as ailerons or elevators, by providing a mechanical advantage. When the pilot moves the control stick or yoke, the spring tab, which is attached to the control surface, provides resistance through its mechanical springs, enabling precise control of the aircraft's attitude.

The spring tab assists in augmenting the control surface effectiveness, especially at lower speeds or in certain flight conditions where aerodynamic forces might not be sufficient on their own. This mechanism relies strictly on the principles of mechanical energy stored in the springs, which return to their neutral position when no external force is applied.

Understanding this principle is essential for correctly interpreting how various aircraft control systems function, particularly in regards to enhancing pilot input and improving overall control effectiveness without depending on hydraulic systems or gravity.