Definition
A trim setting that adjusts the elevator (or trim tab) so the airplane naturally tends to pitch the nose upward, reducing the forward control pressure the pilot would otherwise have to hold on the yoke or stick.
Plain English
Trim set so the airplane wants to raise its nose on its own, without the pilot pulling back on the controls.
Context Anchor
Seen when using elevator trim in normal flight and in emergency procedures for loss of elevator control.
Derivation
‘Trim’ comes from the Old English ‘trymman,’ meaning to set in order or balance. In aviation it refers to balancing the control forces so the airplane flies hands-off. ‘Nose-up’ simply names the direction of that balance.
Why Pilots Care
Allows the pilot to sustain a climb or glide attitude with minimal yoke or stick pressure, which becomes essential when elevator effectiveness is reduced.
Grounding Statement
If you add nose-up trim, the airplane is being adjusted to hold its nose higher without as much pulling force from the pilot.
Intuition Check
Nose-up trim does not mean the nose instantly points up by itself. It means the airplane is adjusted to reduce the force needed to hold a nose-higher attitude.
Example Sentence 1
After losing elevator control, the pilot used small amounts of nose-up trim to raise the nose for the approach.
Example Sentence 2
With the elevator damaged, the pilot used nose-up trim to help maintain a stable descent without constant forward pressure.