When is the pitch of a propeller most likely to be changed?

The pitch of a propeller is most likely to be changed during take-off and landing because these phases of flight require a significant alteration in engine performance and thrust. During take-off, the propeller needs a lower pitch to provide greater thrust, enabling the aircraft to achieve the necessary lift-off speed quickly. Conversely, during landing, a higher pitch setting is often used to reduce thrust and help control the descent rate as the aircraft approaches the runway. This dynamic adjustment optimizes engine efficiency and performance based on the varying aerodynamics encountered during these critical phases of flight.

In cruising flight, the propeller pitch is typically set for efficient operation at a constant speed and altitude, rather than frequent adjustment. In adverse weather conditions, while flying maneuvers might be altered, the pitch doesn't change as directly as it does during the critical take-off and landing stages. When the aircraft is stationary, changing the pitch of the propeller is generally not necessary, as the propeller's performance is not relevant until the aircraft is in motion.