What are the main hydraulic system components in the UH-60 and how is their lubrication maintained?

• A. Pumps, reservoirs, lines, actuators, and valves.
• B. Tail rotor and main rotor.
• C. Electronic sensors only.
• D. Fuel lines and pumps.

Answer: (A)

The main hydraulic system components in the UH-60 are pumps, reservoirs, lines, actuators, and valves. These parts form the power loop: pumps draw fluid from a reservoir and pressurize it, the lines carry that fluid to various actuators which convert the hydraulic energy into mechanical motion to move surfaces and components, and valves direct and regulate the flow and pressure to each actuator. The reservoir stores the fluid, provides room for thermal expansion, and helps keep the fluid clean and ready for use.

Lubrication is maintained because the hydraulic fluid serves as both the lubricant and the medium that transmits power. It continuously circulates through the system, lubricating moving parts such as piston seals and valve components, while filters remove contaminants to protect components. UH-60 aircraft typically employ two independent hydraulic systems for redundancy, each with its own pump, reservoir, lines, actuators, and valves, ensuring continued lubrication and control even if one system is offline. Regular maintenance—monitoring fluid level, checking for leaks, and replacing fluids and filters as scheduled—keeps the lubrication and overall system in good working order.

The other options point to rotor hardware, electronic sensors, or fuel-system elements, which do not describe the main hydraulic components.