What does a transient temperature of 715°C to 824°C require?

A transient temperature range of 715°C to 824°C in an APU is indicative of potentially elevated operational conditions that could affect the engine components. It necessitates a visual inspection of the turbine section because such high temperatures can lead to stress on materials, possible overheating, and deterioration of the turbine blades or vanes. Inspecting the turbine section allows for an assessment of any visible damage, warping, or component failure that might have occurred due to these extreme temperatures.

This proactive approach helps identify any immediate risks to engine integrity and functionality, ensuring the APU operates safely and efficiently. Such inspections are critical in preventing further damage that could lead to costly repairs or downtime, enhancing overall aircraft reliability and safety during operations.