What components make up the APU oil pump assembly?

The APU oil pump assembly is primarily designed to circulate oil within the auxiliary power unit (APU) to ensure its efficient operation and longevity. In this assembly, pumps are critical components as they are responsible for moving the oil through the system. The presence of a filter is also essential, as it removes contaminants from the oil to protect the internal components of the APU from wear and damage. Additionally, the valve assembly helps manage the flow and pressure of the oil, ensuring that it is delivered where needed and at appropriate levels.

This combination of pumps, a filter, and a valve assembly provides a comprehensive approach to maintaining the oil's cleanliness, managing its flow, and ensuring reliable functioning of the APU. Each component plays a vital role in the operation and maintenance of the APU, contributing to its overall reliability and performance.