Aircraft split hydraulic system

Power plants – Pressure fluid source and motor – Apparatus having means responsive to or ameliorating the...


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60420, 60430, F15B 1116




A hydraulic system having two pumps, typically driven by two independent prime movers, a primary and secondary reservoir and associated valving to permit the system to run as one system or two independent systems, all for the purpose of redundancy and safety. The system senses fluid level in the primary reservoir and actuates the valves to establish two independent hydraulic systems, each with its own reservoir, when the fluid level drops below a predetermined level. The system is particularly advantageous in twin-engine aircraft where three hydraulic systems are employed, one off of each engine, and the third system uses two pumps, one driven by each engine.

patent: 2745357 (1956-05-01), Strayer
patent: 3138002 (1964-06-01), Ernst et al.


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