Which hydraulic system powers the landing gear under normal operation?

• A. System 1
• B. System 2
• C. System 3
• D. All three

Answer: (C)

Landing gear is powered by the hydraulic system dedicated to gear functions—the third system. This dedicated supply has its own pump and lines to the gear actuators, ensuring reliable extension and retraction even if the other hydraulic systems are dealing with faults. The other hydraulic systems handle different aircraft functions like flight controls and surfaces, so they aren’t used to power the landing gear in normal operation.