What does HS1 contain?

• A. Pump manifold, pump reservoir, filter unit, case drain filter, oil fuel heat exchange, and related indicator.
• B. Only pump manifold and reservoir.
• C. Reservoir and hydraulic lines.
• D. Actuators and sensors.

Answer: (A)

HS1 is the hydraulic system that provides and conditions the fluid for the aircraft’s hydraulic equipment. It includes the pump manifold and reservoir, which supply and store the hydraulic fluid; the filter unit to remove contaminants; a case drain filter to catch leakage from actuators returning fluid to the system; the oil-fuel heat exchanger to cool the hydraulic fluid by exchanging heat with fuel; and the related indicators that monitor and display system status. This combination covers the core components needed to generate, clean, cool, and monitor the hydraulic fluid. Other options omit essential parts like the pump assembly or filtration and cooling features, so they don’t fully describe what HS1 contains.