What does the PMU default to if IOAT is greater than 96 °C but less than 121 °C?

The correct answer is determined by understanding the operational thresholds of the PMU (Power Management Unit) and how it responds to varying temperatures of the IOAT (Inlet Oil Air Temperature). When the IOAT is greater than 96 °C but less than 121 °C, the PMU typically defaults to the upper limit of the specified range to ensure the safe operation of the engine and its components.

In this case, if the IOAT reaches values between 96 °C and 121 °C, maintaining optimal performance and protecting the system from overheating is critical. By defaulting to 121 °C, the PMU is taking a precautionary approach to safeguard the engine from conditions that could lead to potential damage or failure. This temperature limit correlates with the maximum operational threshold and avoids unnecessary constraints on engine performance while still adhering to the operational safety standards.

Understanding this logic is essential for operating the systems safely and ensuring that equipment functions within specified temperature limits. The other temperature options do not reflect the need to maintain maximum allowable thresholds within the defined operational spectrum, which is why they would not be correct.