How does an increase in operational hours on the APU influence maintenance needs?

An increase in operational hours on the Auxiliary Power Unit (APU) indicates that the unit has been used more extensively, exposing it to wear and tear. This increase in usage directly correlates with the need for more stringent and frequent inspections and maintenance.

As the operating hours accumulate, the components of the APU are subjected to higher thermal and mechanical stresses. This can lead to degradation of parts such as filters, seals, and fuel injectors, among others. Regular maintenance checks are essential to ensure all systems are functioning correctly, to assess for any signs of wear, and to perform necessary repairs. By adhering to more frequent service intervals, the overall reliability and performance of the APU can be maintained, thus preventing unexpected failures during operations.

This emphasis on heightened maintenance needs with increased operational hours is crucial for ensuring safety, efficiency, and longevity of the APU, thereby supporting mission readiness.