Definition
A control input technique in which the pilot applies a counter input that is sized to match the rate and severity of the unwanted aircraft motion — small motion gets a small input, large motion gets a larger input — rather than applying a fixed amount of control regardless of what the airplane is doing.
Plain English
Match your control input to what the airplane is actually doing. If it's drifting a little, push a little. If it's moving fast or far, push more. Don't always use the same amount of force.
Context Anchor
Used in aircraft control discussions, especially when learning to correct unwanted pitch, roll, yaw, drift, or other movement without overcontrolling.
Derivation
Proportional comes from the Latin proportio, meaning 'in the right relation to.' A proportional response is one that is sized in the right relation to what caused it — not too much, not too little.
Why Pilots Care
Allows accurate assessment of radiation dose rates encountered during high-altitude flight so pilots can manage exposure risk.
Intuition Check
Do not read counter response as a full opposite shove on the controls. In this phrase, counter means opposite, and proportional means only enough correction for what the airplane is doing.
Example Sentence 1
The instructor stressed proportional counter response during crosswind landings — small drift, small correction; bigger drift, bigger correction.
Example Sentence 2
By monitoring the proportional counter response the crew confirmed they were still within acceptable radiation limits for the route.