With the PMU functioning, the mechanical overspeed governor limits Np below what percentage?

When the Power Management Unit (PMU) is functioning, it plays a critical role in the regulation and protection of the engine by implementing a mechanical overspeed governor. This governor is specifically designed to prevent the engine from exceeding safe operational limits, particularly concerning the propeller's rotational speed (Np).

In the case of the T-6A, the mechanical overspeed governor kicks in to maintain the propeller speed (Np) at a maximum limit to ensure safety and prevent potential damage. The specified limit with the PMU active is set at 106%. This threshold gives a margin for efficient performance as well as a safeguard against overspeed conditions.

Understanding this operational limit is crucial for pilots, as it helps them manage engine performance effectively during various phases of flight, particularly during maneuvers that may stress the engine. Knowing the exact threshold established by the PMU not only aids in maintaining optimal performance but also ensures adherence to safety protocols in aviation operations.