Which hydraulic component is responsible for converting fluid pressure into linear motion to move flight control surfaces?

Which hydraulic component is responsible for converting fluid pressure into linear motion to move flight control surfaces?

• A. Actuators
• B. Reservoirs
• C. Pumps
• D. Lines

Answer: (A)

Actuators are the devices that turn hydraulic pressure into mechanical movement. Inside an actuator you have a piston working inside a cylinder. When fluid at pressure enters, it pushes on the piston with a force equal to pressure times the piston’s area, producing a linear motion of the piston rod. That linear motion is then transmitted through linkages to move flight control surfaces like the ailerons, elevator, or rudder. Hydraulics store fluid energy in a reservoir and pressurize it with a pump, and the lines carry the fluid to the actuator, but the actual conversion of pressure into motion happens in the actuator itself. In many aircraft systems, actuators can be single-acting or double-acting, allowing motion in one or both directions as needed to control surfaces.

Actuators are the devices that turn hydraulic pressure into mechanical movement. Inside an actuator you have a piston working inside a cylinder. When fluid at pressure enters, it pushes on the piston with a force equal to pressure times the piston’s area, producing a linear motion of the piston rod. That linear motion is then transmitted through linkages to move flight control surfaces like the ailerons, elevator, or rudder. Hydraulics store fluid energy in a reservoir and pressurize it with a pump, and the lines carry the fluid to the actuator, but the actual conversion of pressure into motion happens in the actuator itself. In many aircraft systems, actuators can be single-acting or double-acting, allowing motion in one or both directions as needed to control surfaces.