What does the actuation unit in a hydraulic system do?

The actuation unit in a hydraulic system plays a crucial role by converting fluid pressure into useful mechanical work. This process is essential for operating various components within an aircraft, such as landing gear, flaps, and other control surfaces. When hydraulic fluid is pressurized and directed through the actuation unit, it creates the force needed to move or position mechanical parts, facilitating effective control and functionality of the aircraft systems.

The other options do not accurately describe the primary function of the actuation unit. Generating thrust is typically associated with engines rather than a hydraulic actuation unit. While storing hydraulic fluid is a function of certain components, it is not the main purpose of the actuation unit itself. Managing airflow over the wings pertains to aerodynamic control surfaces rather than the hydraulic actuation mechanism. Therefore, the accurate definition of the actuation unit emphasizes its role in transforming fluid pressure into mechanical motion, which is vital for the operation of the aircraft's systems.