What action should be taken when the PMU FAIL annunciator lights up?

• A. Continue operating until failure occurs.
• B. Check for system malfunctions.
• C. Perform an immediate landing.
• D. Reset the power management unit.

Answer: (B)

When the PMU FAIL annunciator lights up, the appropriate action is to check for system malfunctions. This warning indicates that there is an issue with the Power Management Unit, which is critical for managing the aircraft’s power systems.

By checking for system malfunctions, the pilot can assess the extent of the issue and determine whether it is a transient problem or something that requires immediate action. This step is crucial for informing subsequent decisions about how to handle the situation safely. The pilot may have various indications, such as abnormal engine performance or system warnings, that can help diagnose the problem.

Prioritizing a thorough assessment allows the pilot to make an informed decision regarding any necessary corrective measures, such as landing procedures or system resets, based on the severity and nature of the malfunction. This approach emphasizes maintaining situational awareness and the safety of the flight operation.