What occurs if a propeller governor senses over speed?

When a propeller governor detects an over speed condition, its primary function is to protect the engine and maintain safe operating conditions. In response to over speed, the governor shifts the propeller blades towards a coarse pitch. This action reduces the angle of attack of the blades, which effectively decreases the thrust produced by the propeller. By moving to a coarser pitch, the propeller allows for reduced RPM, thereby bringing the engine speed back within the safe operational limits.

This response is critical because over speed can lead to potential mechanical failure or engine damage. Regulatory systems are in place within the propeller governor to ensure that the RPM does not exceed safety thresholds, contributing to the overall reliability and efficiency of the aircraft's propulsion system.