Definition
A spring (or pair of springs) attached to a flight control system that applies a force tending to return the control surface — typically the rudder or ailerons — to its neutral, streamlined position when the pilot releases pressure on the controls. Centering springs contribute to an airplane's positive static stability about the affected axis by providing a mechanical restoring force toward neutral.
Plain English
A spring built into the control system that gently pulls a control back to its middle position when the pilot lets go, so the airplane tends to settle back toward straight-and-level on its own.
Context Anchor
Seen in discussions of airplane stability, instability, and how flight controls feel or return toward neutral.
Why Pilots Care
They provide tactile feedback and help prevent unintended control deflections, improving handling and reducing workload.
Analogy
It is like the spring in a computer joystick that pulls the stick back to the middle when you let go. The spring centers the handle; it does not decide where the airplane should go.
Intuition Check
Do not assume “centering” means the airplane will automatically fix an upset. Here, it means a spring is pushing the control toward its middle position.
Example Sentence 1
When the pilot relaxes pressure on the rudder pedals, the centering springs help return the rudder to its neutral position.
Example Sentence 2
Some trainers use centering springs on the elevator to give the aircraft a more stable feel in pitch.