If the IOAT is between 96 and 121 degrees Celsius during engine start, what temperature will the PMU default to?

When the Inlet Oil Temperature (IOAT) is between 96 and 121 degrees Celsius during engine start, the Power Management Unit (PMU) is designed to default to a specific temperature within that range to ensure safe operation and avoid potential issues during engine start-up. In this case, the PMU defaults to 121 degrees Celsius, which is at the upper limit of the specified range.

This choice is correct as it aligns with the PMU’s operating parameters intended to optimize engine performance and reliability. The behavior of the PMU is critical for preventing engine abnormalities, particularly during start when temperature and other conditions can significantly affect engine function.

The available incorrect options either suggest lower default temperatures or temperatures that exceed the safe operational limits for engine starting, which would not be appropriate behavior for the PMU in this scenario. Thus, 121 degrees Celsius is the correct answer, reflecting the upper boundary for optimal safety and performance during the engine's start sequence.