Definition
A control-system device used in some helicopter automatic flight control systems that allows the pilot to manually reposition a flight control against a centering force, then holds the new position when released. The magnetic element clutches the control to a reference point, and a spring provides the feel and return-to-center tendency when the pilot moves against it.
Plain English
A device built into the controls that lets the pilot push the stick or pedal to a new position and have it stay there, with a spring giving a natural feel as it moves. When the pilot lets go, a magnetic grip locks the new position in place.
Context Anchor
Seen in helicopter instrument flying when discussing stabilization systems, automatic flight control systems, and control feel.
Derivation
Magnetic means it uses magnetism to hold something. Brake means a device that restrains motion. Spring means a flexible part that pushes or pulls back after being moved. Together, the term points to a control-holding system that both restrains movement and gives a return force.
Why Pilots Care
It changes how the controls feel and respond. The pilot needs to know that releasing the control does not return it to a neutral position — it stays where it was last placed, which affects trim technique and how attitude changes are made under autopilot.
Analogy
It is like a light clamp combined with rubber bands: the clamp holds the handle where you set it, and the rubber bands give it a gentle pull toward that set position.
Intuition Check
The brake here is not a wheel brake that stops the helicopter. The spring is not a landing-gear spring; it provides control feel and holding force in the flight controls.
Example Sentence 1
The magnetic brake/spring held the cyclic in the new position after the pilot adjusted attitude during the climb.
Example Sentence 2
During the AFCS check, the magnetic brake/spring provided noticeable resistance and then recentered the controls smoothly.