What is the maximum allowable temperature for continuous operation of the APU?

The correct choice highlights that the maximum allowable temperature for continuous operation of the Auxiliary Power Unit (APU) is 717°C. This temperature is critical for ensuring the APU operates within safe limits, as exceeding this threshold could lead to equipment failure or reduced efficiency.

This value is established based on engineering specifications and operational guidelines designed to protect the integrity of the APU’s components. Understanding this limit is essential for operators to maintain the reliability and longevity of the APU during regular use.

Furthermore, this temperature limit takes into account various factors, such as thermal stress and material fatigue, ensuring that the APU remains functional under normal operating conditions without risking damage to its systems.