Definition
An adjustable knob or lever, usually located near the throttle quadrant, that increases or decreases the resistance felt when moving the throttle. Tightening it holds the throttle in a set position; loosening it allows the throttle to be moved freely.
Plain English
A small knob next to the throttle that lets you tighten or loosen how stiff the throttle feels. Tighten it and the throttle stays where you put it. Loosen it and the throttle moves easily.
Context Anchor
Encountered when setting engine power, especially during instrument maneuvers where an unnoticed throttle movement can change airspeed or altitude.
Derivation
Friction comes from a Latin word meaning “to rub.” That helps here because the control works by adding or reducing rubbing resistance in the throttle mechanism, so the throttle holds its position instead of moving too freely.
Why Pilots Care
It prevents unintended power changes that could lead to altitude or airspeed deviations during maneuvers.
Intuition Check
The throttle friction control does not set engine power by itself. It only changes how firmly the throttle stays in the position the pilot selected.
Example Sentence 1
After setting cruise power, she snugged the throttle friction control so the throttle would not creep back during the climb-out turn.
Example Sentence 2
Proper adjustment of the throttle friction control ensured stable engine RPM throughout the instrument approach.