Patent ID: 6536714
Filing Date: 2003-03-25
Classification: B64C,Y02T

Abstract:
In an aircraft including a main wing with a leading edge, at least one slat that has a slat rear surface facing toward said leading edge and that is movably extendible from said main wing to form a slat air gap between said slat rear surface and said leading edge, at least one aerodynamic noise reducing element connected to said at least one slat, and an aircraft bleed air system including a source of compressed engine bleed air,an improvement for controlledly actuating said at least one aerodynamic noise reducing element, wherein each said noise reducing element respectively comprises an inflatable hollow displacement element with at least one hollow space therein, and wherein said improvement further comprises: a bleed air line arrangement connected from said aircraft bleed air system to said at least one hollow space in said at least one hollow displacement element; at least one shut-off valve interposed in said bleed air line arrangement between said aircraft bleed air system and said at least one hollow displacement element; at least one pressure control valve interposed in said bleed air line arrangement respectively between said at least one shut-off valve and said at least one hollow displacement element; a slat contour controller; and respective signal conductor lines connecting said slat contour controller with said at least one shut-off valve and with said at least one pressure control valve; wherein said slat contour controller is adapted to control said at least one shut-off valve to control a quantity of compressed engine bleed air supplied through said bleed air line arrangement into said at least one hollow displacement element, and said slat contour controller is adapted to control said at least one pressure control valve to control a pressure of the compressed engine bleed air supplied through said bleed air line arrangement into said at least one hollow displacement element.