When is the propeller likely to move toward feather during engine failure?

The propeller is likely to move toward feather during an engine failure in flight because this situation is critical for maintaining control and minimizing drag. Feathering the propeller means adjusting its blades to a position that is parallel to the airflow, which significantly reduces aerodynamic drag. In the event of an engine failure while in flight, it is essential to reduce drag as much as possible to maintain altitude and allow for best performance in a glide. The propeller finds its way to a feathered position automatically under certain conditions during this engine failure scenario, which helps optimize the aircraft's performance and control during the emergency.

In contrast, during normal takeoff, a rapid climb, or when initiating a landing, the aircraft is typically in scenarios where the engine is fully operational. There’s no immediate need to feather the propeller during these phases, as they would prioritize thrust and lift rather than minimizing drag due to an engine failure.