Definition
A preflight verification, performed from the pilot seat before engine start, in which the pilot moves the flight controls through their full travel in all directions to confirm they operate freely, smoothly, and in the correct sense, with no binding, restriction, or interference.
Plain English
Sitting in the pilot seat, you move the yoke or stick and the rudder pedals as far as they go in every direction to make sure nothing is stuck, jammed, or hooked up backwards.
Context Anchor
Seen when discussing seating position, cockpit fit, and checks made inside the airplane before flight.
Derivation
The phrase comes from physical and medical use, where “range of motion” means how far a body part can move. In the cockpit, the idea is similar: the pilot checks that their body position allows the needed movement to safely use the airplane’s controls.
Why Pilots Care
Ensures the airplane can be controlled in all directions; a blocked control can cause an immediate loss of control on takeoff or in flight.
Grounding Statement
Sitting in the pilot seat, the pilot should be able to move the controls and reach important switches without stretching, twisting, or being blocked.
Intuition Check
Do not read this as only a medical check of the pilot’s body. In this cockpit context, it means checking the pilot’s ability to reach and move the airplane’s controls from the actual seated flying position.
Example Sentence 1
Before starting the engine, the pilot performed a range of motion check on the yoke and rudder pedals to confirm full and free travel.
Example Sentence 2
If the range of motion check reveals any binding in the elevator, the flight must be postponed until the issue is resolved.