What maintenance checks are recommended for the APU?

The recommended maintenance checks for the Auxiliary Power Unit (APU) in the C-130J include regular inspections and oil changes. This choice addresses the need for comprehensive upkeep of the APU, which is critical for ensuring its reliable operation. Regular inspections allow for the identification of any wear or potential failures in various components, while oil changes are essential to keep the internal mechanisms lubricated and functioning smoothly.

Regular inspections typically cover multiple aspects such as checking for leaks, assessing the condition of electrical systems, and verifying that all operational parameters are within acceptable limits. Oil changes help maintain the integrity of the engine and other mechanical parts by preventing damage that can arise from dirty or degraded oil. This maintenance approach significantly enhances the longevity and performance of the APU.

Other choices lack sufficient scope for effective maintenance. For instance, simply checking fuel levels, without further assessment or care, does not address potential issues within the APU itself. Periodic component replacements, while important, should be part of a broader maintenance strategy that involves consistent inspections and fluid changes. Cleaning external surfaces alone does not provide any insight into the internal condition or performance of the APU, which is critical for operational readiness.