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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 le

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.

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A hydraulic system for an aircraft, said system comprising: a. a fluid reservoir comprising a containing structure defining a fluid containing chamber and having a top wall and a bottom wall, said reservoir further comprising a first fluid inlet means having a first fluid inlet opening located at a

A hydraulic system for an aircraft, said system comprising: a. a fluid reservoir comprising a containing structure defining a fluid containing chamber and having a top wall and a bottom wall, said reservoir further comprising a first fluid inlet means having a first fluid inlet opening located at a position spaced above said bottom wall and below said top wall, said chamber having an upper chamber portion located above said first inlet opening, and a lower chamber portion located below said first inlet opening, a second fluid inlet means having a seoond fluid inlet opening located below said first inlet opening at an inlet location at a lower part of said lower chamber portion; b. a first hydraulic power outlet means; c. a second hydraulic power outlet means; d. a pump means to draw fluid from the reservoir and to deliver fluid to the first and second power outlet means, said pump means having an operative flow connection with said reservoir which is characterized in that with a low level fluid condition in said reservoir and with said pump not operating, fluid would flow from said pump means to said reservoir; e. a first supply isolation valve having a first position and a second position, and being operatively connected to the first and second inlet means and to the pump means, said supply isolation valve in its first position delivering fluid from said first inlet means to the pump means, said supply isolation valve in its second position delivering fluid from the second inlet means to the pump means; f. a second pressure isolation valve operatively connected to the pump means and having a first position and a second position, said pressure isolation valve in its first position permitting flow from the pump means to the first power outlet means, and in its second position blocking flow from the pump means to the first power outlet means, while permitting flow from the pump means to the second power outlet means; g. fluid level monitoring means to detect when fluid level in said chamber is at or below a predetermined caution level and to produce a corresponding low level signal; h. control means to become operative in response to said low level signal to move said first and second valves to their second positions, and to cause said pump means to operate; whereby in the event of fluid loss in the system, said pressure isolation valve in its second position is able to alleviate loss of fluid for said pump means, and said supply isolation valve in its second position is able to direct fluid from said lower chamber portion to said pump means, with operation of said pump means preventing loss of fluid from said pump means.