When experiencing uncommanded power changes, what switch should be turned off?

Turning off the PMU SWITCH is the correct response during uncommanded power changes because the Power Management Unit (PMU) is responsible for controlling the engine’s power output and ensuring that it operates within specified limits. If there's an uncommanded change in power, it may be indicative of a malfunction in the PMU, which could be causing erratic engine behavior or fluctuating power levels.

By turning off the PMU SWITCH, you're taking a proactive step to disengage the automatic control of the engine and potentially restore more stable power output. This action may help to isolate the issue and allow for manual control of the engine performance through the Power Control Lever (PCL).

In contrast, the other switches mentioned are either not directly responsible for managing power output or are not appropriate for addressing the specific issues arising from uncommanded power changes. For instance, adjusting the PCL alone may not resolve the underlying problem if the PMU is the source of the malfunction. The STARTER SWITCH is typically used for initiating engine start procedures and does not play a role in power management once the engine is running. Similarly, the FUEL FLOW SWITCH is not directly related to managing the power outputs and turning it off could compromise engine performance further.

Thus