What are the indications of PMU failure?

The correct choice encompasses a comprehensive understanding of the indications of a PMU (Power Management Unit) failure. The PMU is a crucial component in the T-6 aircraft that manages engine performance and parameters, ensuring safe and efficient operation.

When the PMU fails, several indicators can signal this issue to the pilot. The first indication is the 'PMU FAIL' annunciator, which directly alerts the pilot to a malfunction with the PMU. Additionally, a power step change may occur, indicating an immediate change in engine power output that can suggest a failure in the system's management.

The second indication stems from the MASTER WARN light and an aural tone that actively warns the pilot of urgent issues requiring attention. These warnings are critical in preventing further complications and maintaining situational awareness.

Therefore, all these indications together provide a complete picture of a PMU failure scenario. This highlights the importance of vigilant monitoring of system alerts and responses in flight operations, ensuring pilots can react appropriately to maintain aircraft safety.