What does the aircraft landing gear hydraulic system do?

• A. Extends/retracts gear and powers braking or strut retraction as needed
• B. Provides steering for the aircraft on ground
• C. Controls fuel flow to engines
• D. Generates electrical power for systems

Answer: (A)

The landing gear hydraulic system uses high‑pressure hydraulic fluid to power the actuators that move the gear in and out, and to operate the wheel brakes. When it’s time to land, hydraulic pressure extends the gear; after touchdown, pressure retracts it into the nacelles or fuselage bays. That same hydraulic pressure also drives the wheel brake assemblies, providing the braking force needed for stopping on the ground. The system is specifically about gear movement and braking, not about steering, fuel flow, or electrical power generation, which are handled by other aircraft systems.