Which hydraulic system controls the nosewheel steering?

Which hydraulic system controls the nosewheel steering?

• A. System 3
• B. System 2
• C. System 1
• D. ADG Bus

Answer: (A)

Nosewheel steering on this aircraft is powered by hydraulic System 3. When you turn the tiller, a steering valve uses pressure from System 3 to operate the nose landing gear steering actuator, rotating the nose wheel for taxi and low-speed maneuvering. System 1 and System 2 power other flight controls and systems, not the nosewheel steering, under normal operations. The ADG Bus is an electrical emergency power path and does not supply the hydraulic pressure for steering. So the hydraulic system responsible for steering the nose wheel is System 3.

Nosewheel steering on this aircraft is powered by hydraulic System 3. When you turn the tiller, a steering valve uses pressure from System 3 to operate the nose landing gear steering actuator, rotating the nose wheel for taxi and low-speed maneuvering. System 1 and System 2 power other flight controls and systems, not the nosewheel steering, under normal operations. The ADG Bus is an electrical emergency power path and does not supply the hydraulic pressure for steering. So the hydraulic system responsible for steering the nose wheel is System 3.