Definition
An adjustment made to the airplane's pitch control system that relieves the control force a pilot must hold on the elevator to maintain a desired pitch attitude or airspeed. Pitch trim is typically set using a trim wheel, electric trim switch, or trim tab, and it repositions a small surface (or adjusts the elevator's neutral point) so the airplane naturally settles at the chosen attitude without continuous pilot input.
Plain English
A way to take the pressure off the control yoke. Once the airplane is flying the way you want it, you adjust the trim so you no longer have to push or pull to hold that pitch.
Context Anchor
Encountered during slow flight, stall recovery, climbs, descents, and any time a change in power or airspeed changes the pressure the pilot feels on the controls.
Derivation
"Trim" comes from the Old English trymman, meaning to set in order or arrange properly. Sailors used it for adjusting sails and ballast so a ship sat balanced in the water. The aviation use carries the same idea: arranging the controls so the airplane sits balanced in the air without the pilot fighting it.
Why Pilots Care
Correct pitch trim reduces control forces and prevents unintended pitch changes that could lead to a secondary stall or loss of control during recovery.
Intuition Check
Pitch trim does not mean setting the airplane’s final attitude and letting go. It means reducing the pressure needed to hold the nose position or airspeed you want.
Example Sentence 1
After leveling off at cruise altitude, the pilot adjusted pitch trim until the airplane held altitude with no pressure on the yoke.
Example Sentence 2
Once the airplane is accelerating and climbing, the pilot trims the pitch so the nose stays steady at the target climb speed.