Definition
A control system in which the output changes in direct proportion to the input. A given amount of movement or signal at the input produces a predictable, proportional amount of response at the output across the full operating range.
Plain English
A control where the response matches the input evenly. Move the input a little and you get a little response; move it twice as much and you get twice the response.
Context Anchor
Seen in cockpit control descriptions and maintenance discussions for push-pull or sliding controls.
Derivation
From the Latin linea, meaning 'line.' A linear control behaves along a straight line on a graph — input on one axis, output on the other — with no curves, jumps, or flat spots.
Why Pilots Care
Provides direct, precise movement to control surfaces with minimal stretch or lost motion.
Analogy
A drawer handle is a simple linear control: you pull it straight out and push it straight back in.
Intuition Check
Linear does not mean “more precise” or “more advanced” here. It means the control moves along a straight path.
Example Sentence 1
The elevator trim system uses a linear control, so each turn of the trim wheel produces the same amount of trim change.
Example Sentence 2
Linear controls reduce play compared with cable systems during preflight checks.