Which component powers the flight control hydraulically?

Which component powers the flight control hydraulically?

• A. Power Control Unit (PCU)
• B. Hydraulic pump A
• C. Hydraulic pump B
• D. Electric motor

Answer: (A)

In hydraulically powered flight control, the movement of the control surfaces is generated by hydraulic actuators called Power Control Units. The hydraulic pumps provide the pressure, but the PCU is the actual device that converts that hydraulic pressure into motion to deflect the surface. It uses the pressure to drive a piston and valve that respond to the pilot’s input, delivering the commanded movement and holding the surface in the new position through feedback. The hydraulic pumps themselves supply the pressure, but do not directly move the surface—that role belongs to the Power Control Unit. An electric motor is not the direct hydraulic power source for the flight controls in this context.

In hydraulically powered flight control, the movement of the control surfaces is generated by hydraulic actuators called Power Control Units. The hydraulic pumps provide the pressure, but the PCU is the actual device that converts that hydraulic pressure into motion to deflect the surface. It uses the pressure to drive a piston and valve that respond to the pilot’s input, delivering the commanded movement and holding the surface in the new position through feedback. The hydraulic pumps themselves supply the pressure, but do not directly move the surface—that role belongs to the Power Control Unit. An electric motor is not the direct hydraulic power source for the flight controls in this context.