What does the illumination of both PMU FAIL and PMU STATUS annunciators indicate?

The illumination of both the PMU FAIL and PMU STATUS annunciators indicates that the system is in manual mode. This situation typically arises when there is a failure in the power management unit (PMU), which could prevent the system from operating normally. The PMU FAIL annunciator alerts the operator to a malfunction, while the PMU STATUS light confirms that the system has transitioned to manual control as a safety measure.

In manual mode, operators may need to manually manage certain system functionalities that the PMU would typically handle in automatic or semi-automatic modes. Understanding this operational state is crucial for effective decision-making in responses to potential failures.

The other options do not align with the function of these annunciators. An operational state would not activate both indicators; programming and standby modes would also not typically trigger both lights simultaneously, as these modes imply different system behaviors that do not include failure indications.