If the propeller pitch change mechanism loses oil pressure, where will the propeller automatically move towards?

If the propeller pitch change mechanism loses oil pressure, it will automatically move toward the feathered position. This happens because the feathered position is designed to minimize drag in the event of an engine failure or loss of oil pressure. When oil pressure is lost, the blades are forced by counterweights or springs to rotate to a position where their leading edge points into the oncoming airflow. This significantly reduces drag and prevents further damage or complications that could arise from continuing to operate with a non-functional engine.

In normal operation, sufficient oil pressure maintains the blades in the propeller's normal or low pitch position for efficient thrust production during flight. However, if that pressure is lost, the safety design of the system ensures that the propeller will transition to a feathered position rather than remain in a pitch that could cause detrimental effects.