主权项 |
1. An aircraft hydraulic system comprising:
two independent hydraulic circuits, with each of said circuits being supplied by at least two pumps respectively, wherein each of said pumps associated with a same one of said circuits is driven by a different propulsion engine, and further wherein one of said two independent hydraulic circuits supplies hydraulic power to a set of consuming units, and the other of said two independent hydraulic circuit supplies hydraulic power to the same set of consuming units; wherein for each of said independent circuits:
at least one pump, amongst said at least two pumps, is driven by one of the propulsion engines that may suffer an uncontained engine failure, which uncontained engine failure may project debris into a projection area;connecting lines from the at least one pump to the rest of the at least one hydraulic circuit are installed in part in the projection area, said lines comprising:
at least one low pressure hydraulic fluid suction line in which the hydraulic fluid flows from a hydraulic tank towards the at least one pump, said at least one suction line comprising a cut-out valve which in the open position lets the fluid circulate in said suction line and in the closed position prevents the fluid from circulating in said suction line;at least one high pressure hydraulic fluid discharge line, referred to as HP discharge line, in which the hydraulic fluid flows from the pump towards the rest of the hydraulic circuit, said at least one HP discharge line comprising a check valve installed to prevent hydraulic fluid from circulating in said HP discharge line towards the pump; and further wherein the at least one suction line and the at least one HP discharge line each comprise at least one pressure sensor respectively, able to deliver a signal characteristic of a hydraulic fluid pressure value in the line under consideration between the pump and the cut-out valve, respectively between the pump and the check valve, and wherein the hydraulic circuit comprises a control system for the cut-out valve that:
receives from the at least one pressure sensor in each line, suction line and HP discharge line, the distinctive measured pressure signal;compares each distinctive measured pressure signal to a threshold predefined for each line;issues a close cut-out valve command signal to close the cut-out valve when at least one of the distinctive measured pressure signals is below the threshold to which it has been compared. |