What could prolonged APU operation lead to?

Prolonged operation of the Auxiliary Power Unit (APU) can lead to increased wear and tear on its components. This is primarily because the APU is designed for short durations of operation to perform specific tasks, such as providing electrical power and pneumatic pressure during ground operations. Continuous operation beyond its intended use can result in overheating, excessive vibration, and mechanical fatigue, leading to the degradation of parts like bearings, seals, and turbines.

Increased wear and tear can necessitate more frequent maintenance checks and can ultimately shorten the lifespan of the APU, potentially leading to operational inefficiencies and costly repairs. Understanding this aspect is crucial for ensuring the longevity and reliability of the APU in the overall aircraft performance.