Abstract: Hydraulic power supplies for aircraft which have such hydraulically operated systems as flaps, ailerons, spoilers, rudders, elevators, brakes, and retractable and steerable landing gear. Typically, the aircraft will be of the multiengine type; and there will also be a multiplicity of hydraulic power supplies and engines. This scheme can be utilized to provide operating redundancy for the hydraulically operated devices of the aircraft. Each hydraulic power supply has a solid state controller which has a number of inputs as well as control and information providing functions. Control over the functioning of each hydraulic power supply can also be exercised by flight deck crew-operated switches which are connected to inputs of the solid state controllers.

Abstract: A hydraulic system for an aircraft to provide improved reserve capability for the thrust reverser power system. There is a fluid reservoir having a vent tube with an inlet location located above the bottom wall of the reservoir. In the event that fluid in the reservoir reaches a predetermined low level, supply and pressure isolation valves isolate at least one pump from the rest of the hydraulic system, and also start that pump operating, with a reserve supply of fluid being available for supplying power for the thrust reverser.

Abstract: A hydraulic system for an aircraft to provide improved reserve capability for the steering and reserve brake power system. There is a fluid reservoir having a vent tube with an inlet location located above the bottom wall of the reservoir. In the event that fluid in the reservoir reaches a predetermined low level, supply and pressure isolation valves isolate at least one pump from the rest of the hydraulic system, with a reserve supply of fluid being available for supplying power for the steering wheel and reserve brakes.

Abstract: A single manifold assembly is located in an easily accessible hydraulic servicing bay. The assembly includes a manifold (2) with an inlet port (4) having an integral check valve (8). A plurality of branch conduits (18), one for each reservoir, communicate with manifold (2). A two-way shut-off valve (20) is located in each conduit (18). Each valve (20) has a handle (22) for manually moving it between an open and a closed position. Each conduit (18) communicates with its corresponding reservoir. Manifold (2) includes a manual bleed valve (12) and an automatic relief valve (16). By selective positioning of the shut-off valves (20) and operation of bleed valve (12) and inlet port (4), any or all of the reservoirs may be depressurized or pressurized. Preferably, an automatic bleed valve (26) is provided for each individual reservoir. A single gauge (30) mounted on manifold (2) provides pressure readings for any one of the individual reservoirs by selective positioning of valves (20 ).