Which component is NOT part of a basic aircraft hydraulic system?

A basic aircraft hydraulic system is designed to manage the hydraulic fluid necessary for operating various aircraft systems, such as landing gear, brakes, and flight control surfaces. The components involved in this system focus specifically on the management and flow of hydraulic fluid.

The reservoir serves as the storage unit for the hydraulic fluid, ensuring that there is always a supply available for the system’s operations. The pump is crucial because it generates the flow and pressure needed to move the fluid through the system effectively. The selector valve directs the flow of hydraulic fluid to the appropriate components, allowing for control of various functions within the aircraft.

An electrical generator, however, is not a fundamental part of a basic hydraulic system. While hydraulic systems may require electrical power for certain components or automated functions, the core hydraulic system itself does not include a generator as a component. The generator might be part of the broader aircraft electrical architecture, but it is not necessary for the hydraulic system's basic operation. Thus, understanding the role each component plays is essential for identifying which is not integral to the function of a basic aircraft hydraulic system.