Under what condition does the PMU go offline?

The PMU, or Power Management Unit, typically goes offline when there is a high temperature situation, specifically when the temperature exceeds 121°C. This mechanism is in place to protect the system from overheating and potential damage. When the PMU goes offline, it helps to prevent system failures or malfunctions caused by excessive temperatures that could lead to unsafe operating conditions.

With this understanding, it becomes clear that the other conditions listed are not applicable for the PMU going offline. For instance, temperatures below 121°C do not trigger a shutdown of the PMU, as it is designed to operate within that range. Similarly, while low fuel levels can affect many operational parameters, they do not directly cause the PMU to go offline, making this choice distinct from the primary thermal threshold that activates the PMU's shutdown protocol.