Definition
A spring installed in a flight control system that applies force to return a control surface, or its associated control input, toward a neutral or centered position when the pilot is not actively holding it elsewhere. In the context of stability, centering springs contribute to positive static stability by producing a restoring force that opposes displacement from the trimmed or neutral condition.
Plain English
A spring built into the controls that pulls them back to the middle position when you let go, helping the airplane settle back to where it was.
Context Anchor
Seen in discussions of airplane stability, control feel, and systems that make the controls return toward center.
Why Pilots Care
It supplies artificial feel and a positive return-to-neutral force, reducing the tendency for the aircraft to wander when the pilot is not actively holding the controls.
Analogy
It is like a spring-loaded door handle that returns to its normal position after you let go.
Intuition Check
Do not assume a centering spring means the airplane will automatically hold its attitude or correct itself in flight. It only means a spring is pushing the control toward its centered position.
Example Sentence 1
When the pilot released the rudder pedals, the centering spring returned the rudder to its neutral position.
Example Sentence 2
The rudder's centering spring helped keep the airplane tracking straight during cruise by returning the pedals when the pilot relaxed pressure.