What should you do if you experience uncommanded power changes?

In the event of uncommanded power changes, the recommended procedure involves a systematic approach to mitigate risks and regain control of the aircraft's power settings. Each action plays a significant role in addressing the issue.

The first step involves adjusting the Power Control Lever (PCL) to the mid-range position. This action helps stabilize the engine's power output and can potentially correct minor fluctuations by allowing better control of the power delivered to the propeller.

Next, turning off the Power Management Unit (PMU) switch effectively disconnects the electronic management system that automatically controls engine power and propeller pitch. This can prevent further unexpected power changes by reverting the engine to manual control, thereby allowing the pilot to make adjustments without interference from the PMU.

Lastly, pulling the PROP SYS circuit breaker cuts electrical power to the propeller control system. This can serve as a last resort to ensure that any malfunction in the propeller control is removed from the equation, particularly if the propeller is misbehaving due to the uncommanded power changes.

Since each of these actions serves a distinct purpose in addressing uncommanded power changes, they are collectively important steps to ensure the safety and control of the aircraft. Thus, choosing the option that includes all of the prescribed actions