Definition
A change in the airplane's nose attitude up or down relative to the horizon, produced by elevator input and reflected on the attitude indicator and altimeter. In instrument flying, a pitch change is the primary control input used to start, stop, or correct a climb or descent and to maintain or regain a target altitude.
Plain English
Raising or lowering the nose of the airplane. Push the nose down and you start descending; raise it and you start climbing. A pitch change is the small nose-up or nose-down adjustment used to hold or correct altitude.
Context Anchor
Seen in instrument flying when using the altimeter to help detect whether the airplane is staying level, climbing, or descending.
Derivation
‘Pitch’ in aviation refers to rotation about the airplane's lateral (wing-to-wing) axis — the nose moving up or down. A ‘pitch change’ is simply a movement of the nose along that axis.
Why Pilots Care
Uncorrected pitch changes cause unintended altitude deviations that must be detected and fixed on the altimeter to stay on altitude.
Analogy
Think of gently tilting a toy airplane’s nose upward or downward. That tilt is the kind of change pilots mean by pitch change.
Intuition Check
Do not read pitch change here as a change in sound, propeller blade angle, or throwing motion. In this context, it means the airplane’s nose attitude changed up or down.
Example Sentence 1
Noticing the altimeter drifting down by twenty feet, the pilot made a small nose-up pitch change to return to the assigned altitude.
Example Sentence 2
The pilot applied a small pitch change to return the airplane to level flight and stop the altitude loss.