Which systems does the hydraulic system operate?

The hydraulic system is essential for various operational components in an aircraft, allowing for efficient control and movement. The correct response indicates that the hydraulic system powers the nose wheel steering and landing gear. This is accurate because hydraulic systems provide the necessary force to move these components, ensuring they function smoothly during takeoff, landing, and taxiing.

Nose wheel steering is critical for directing the aircraft while it is on the ground, and hydraulic systems offer precise control for this steering mechanism. Similarly, the landing gear's extension and retraction during flight rely heavily on hydraulic pressure, which allows for reliable operation and enhances safety.

While other components such as speed brakes, gear doors, flaps, and flight controls may utilize hydraulic systems in some aircraft, they may not all be powered solely or primarily by hydraulics in every aircraft configuration. Therefore, the focus on nose wheel steering and landing gear aligns correctly with their established function in typical hydraulic systems.

In summary, the answer correctly highlights the specific applications of the hydraulic system that are commonly recognized, providing a foundational understanding of aircraft systems.