What is the main function of hydraulic systems in an aircraft?

The primary function of hydraulic systems in an aircraft is to move and actuate components such as the landing gear, flaps, and brakes. Hydraulic systems are crucial because they provide the necessary force to perform operations that require significant power, which mechanical systems alone may not be able to handle efficiently.

These systems utilize hydraulic fluid to transmit force from one location to another, allowing for smooth and effective movement of these critical components during different phases of flight. For instance, when lowering the landing gear or deploying flaps for landing or takeoff, the hydraulic system applies pressure to actuators that mechanically move the parts into the desired position. Additionally, hydraulics are essential for braking systems, which require rapid and powerful engagement to ensure the aircraft can stop safely.

In contrast, other options focus on functions not related to hydraulic systems. Fuel delivery is handled by fuel systems, navigation is managed by avionic systems, and altitude control is accomplished through flight control systems and autopilot mechanisms. Each of these systems operates independently, but the hydraulic system is specifically designed for the actuation of moving parts within the aircraft.