Which hydraulic operation normally uses a double-acting, unbalanced linear actuator?

The landing gear systems typically use a double-acting, unbalanced linear actuator due to the specific operational requirements of extending and retracting the landing gear.

In landing gear operations, the actuator must provide force in both directions: one to extend the landing gear and another to retract it. The double-acting actuator allows for hydraulic fluid to act on either side of the piston, providing the necessary force for movement in both directions. The unbalanced design allows for a greater force output during one phase of the operation, which is particularly useful when the weight and inertia of the landing gear must be overcome when retracting.

This actuator design is crucial for ensuring reliable and efficient operation, as the landing gear often needs to engage and disengage rapidly during flight operations, ensuring smooth transitions between the aircraft's different phases of flight. Other systems like flap control, ailerons, or rudder typically utilize other types of actuators that are better suited for their specific movement and load requirements.