What does the PMU STATUS light indicate in flight?

The PMU STATUS light in flight indicates a fault related to the weight-on-wheel switches. This system is crucial for the proper functioning of the T-6A's primary management unit (PMU), as it helps determine whether the aircraft is on the ground or in flight. The weight-on-wheel switches ensure that certain parameters, such as fuel flow and engine performance, are correctly adjusted based on the aircraft's operational status. If there is a malfunction in these switches, the PMU STATUS light will illuminate, alerting the pilot to a potential issue that needs to be addressed.

Understanding the significance of the PMU STATUS light is vital for maintaining clarity regarding engine management and safety protocols during flight. The other options refer to different systems and faults that could arise but do not correlate directly with the function and meaning of the PMU STATUS light in the context of the T-6A.