What should you do in the event of a propeller overspeed condition?

In the event of a propeller overspeed condition, the appropriate response is to retard the throttles and reduce airspeed. This action helps decrease the engine power being transmitted to the propeller, which in turn reduces the risk of further overspeeding.

When a propeller overspeeds, it is typically due to a mismatch between the engine output and the propeller's ability to handle that power. By retarding the throttles, you are effectively lowering the engine RPM, which can help stabilize the situation and prevent potential for mechanical failure or excessive wear. Additionally, reducing airspeed can help alleviate the load on the propeller, contributing to maintaining a safe operational state.

In this scenario, increasing throttle or setting the propeller to high RPM would exacerbate the overspeed condition rather than mitigate it, as they both contribute to increased propeller speed. Feathering the propeller can also be a valid response in certain situations to reduce drag, but it's typically performed after addressing the immediate overspeed condition; thus, the focus in the initial response should be on controlling engine power and airspeed.