Abstract: Procedure for the manufacture of a composite part (13) of a closed compartment, said part (13) having an access assembly to said compartment through an opening (11) in said part (13), said access assembly comprising a cover (27) for said opening (11) and a housing panel (25) for said cover (27), comprising steps of: a) providing common laminates (31, 31?, 31?) of a composite material for said cover (27) and said housing panel (25) in an uncured state; b) cutting said common laminates (31, 31?, 31?) by the perimeter foreseen for said cover (27) and separating the cover laminates (33, 33?, 33?) and the housing panel laminates (35, 35?, 35?); c) manufacturing separately, on the one side, the cover (27) using said cover laminates (31, 31?, 31?) and, on the other side, the part (13) together with said housing panel (25) using said housing panel laminates (35, 35?, 35?).

Abstract: A composite material part and method for manufacturing the part. The part has a large variation in thickness between a first zone having a thickness E1 and a second zone having a thickness E2, which is made as a single part with a transition zone, external surfaces of which have gradients of magnitude, in which the structure of the stack includes; b1) a plurality of continuous plies that extend in the three zones; b2) a plurality of plies that extend in the first zone and in the transition zone, terminating in a stepped manner in the transition zone; b3) a plurality of plies that extend in the first zone and in the transition zone, terminating in a stepped manner in the transition zone.

Abstract: Its object is to allow measurement of the volume of fuel (2) using optic fiber cables (3); it is characterized in that, adhered to one or more of the inner faces of the tank (1) there is at least one sheet (4) in which a plurality of optic fiber cables (3) with different lengths are included, located between the inner face of the tank and the sheet (4). One set of the ends (10) of the optic fiber cables (3) are disposed so that they are in contact with the fuel (2) when it reaches their level, thereby allowing measurement of the fuel level at all times. The preferred embodiment distributes the optic fiber cables (3) on two opposing lateral faces of the tank (1) so that they cross over one another and in opposite directions to measure any fuel level. It is applied in aeronautics.

Abstract: A device provides electrical continuity between aeronautical components including a first fixed component and a second component displaceable with respect to the first component. The first and second components include electrically conducting surfaces. A first conductive piece is fixed to the first component and a second conductive piece is fixed to the second component. The first and second pieces are joined together with the possibility of sliding one on the other, in such a way that the first piece is connected to the conductive surface of the first component and the second piece is connected to the conductive surface of the second component, so that, when displacements take place of the second component with respect to the first component, the first piece slides on the second piece maintaining the electrical conductivity between the first and second components.

Abstract: A method for laying-up the tapes of a prepeg composite material in the 0° direction of a non-planar composite component on a suitable mold using an ATL machine includes the steps of: a) determining the trajectories of the tapes as modified trajectories of geodesic trajectories complying with the following conditions in their projections in an horizontal plane: that the curvature radius R2 of their curved segments is bigger than a predetermined value Rmin; that the gap G2p between two contiguous tapes is comprised between 0 and a predetermined value Gmax; and b) providing modified trajectories to the ATL machine. The invention also refers to a non-planar composite component such as an skin of an aircraft wing having the tapes in the 0° direction following trajectories complying with conditions described.

Abstract: Composite material part (11) with stringer (31) on ramp, manufactured from a stack of fabrics, which comprises at least one zone (13) with two sectors (17, 19) having a greater thickness than that of the surrounding zones and with the stringer (31) situated on an edge (21) of said zone (13) in which: a) each group of fabrics (27, 27? . . . ; 29, 29?, . . . ) of said sectors (17, 19) has the dimensions to form on said edge (21) a ramp with an acceptable gradient 1/p so that the stringer (31) remains situated on the ramp; b) the stacking of the zone (13) is carried out firstly by placing the fabrics (27, 27?, . . . ) of the first sector (17) and on these the fabrics (29, 29?, . . . ) of the second sector (19) in such a way that in the coinciding section (35) of said edge (21) the gradient of the resulting ramp is 1/(p/2).

Abstract: Provided herein are drainage valves for removing water accumulated in the lower part of fuel tanks of an aircraft. The valves can be affixed in correspondence with a lower skin forming part of the tanks. The lower skin includes recesses for the complementary housing of the heads of the valves that, in combination with some axial fastening nuts, immobilize the valves to that skin. The recesses can comprise a conical structure obtained by deformation of the lower skin, and with the deformation an inner elevated seat is further obtained, on which seat the axial fastening nuts press, maintaining the thickness of the skin in the area where the valves are located, thus preventing the area from weakening as it happens conventionally.

Abstract: Procedure for the manufacture of a composite part (13) of a closed compartment, said part (13) having an access assembly to said compartment through an opening (11) in said part (13), said access assembly comprising a cover (27) for said opening (11) and a housing panel (25) for said cover (27), comprising steps of: a) providing common laminates (31, 31?, 31?) of a composite material for said cover (27) and said housing panel (25) in an uncured state; b) cutting said common laminates (31, 31?, 31?) by the perimeter foreseen for said cover (27) and separating the cover laminates (33, 33?, 33?) and the housing panel laminates (35, 35?, 35?); c) manufacturing separately, on the one side, the cover (27) using said cover laminates (31, 31?, 31?) and, on the other side, the part (13) together with said housing panel (25) using said housing panel laminates (35, 35?, 35?).

Abstract: An aircraft lifting surface structured as a torsion box comprising upper and lower skins (19, 21) stiffened by span wise stringers (25, 25?, 25?), said aircraft lifting surface comprising one or more fuel tanks (31, 33, 35, 37) arranged inside of said torsion box and separated by bulkheads (41), the stringers (25, 25?, 25?) having extended feet in the intersection areas with said bulkheads (41), also comprising filler panels (45) of said skins (19, 21) covering the holes that remain between said skins (19, 21) and said bulkheads (41) outside said intersection areas, whose configuration is adapted for covering the space between the extended feet (26, 26?) of stringers (25, 25?), leaving a gap with them of a predetermined width (W1), thereby providing a self-fastening capability over each skin plane that facilitates the attachment of said filler panels (45) to said skins (19, 21).

Abstract: A method for laying-up the tapes of a prepeg composite material in the 0° direction of a non-planar composite component on a suitable mould using an ATL machine comprising steps of: a) determining the trajectories of said tapes as modified trajectories of geodesic trajectories complying with the following conditions in their projections in an horizontal plane: that the curvature radius R2 of their curved segments is bigger than a predetermined value Rmin; that the gap G2p between two contiguous tapes is comprised between 0 and a predetermined value Gmax; b) providing said modified trajectories to said ATL machine. The invention also refers to a non-planar composite component such as an skin of an aircraft wing having the tapes in the 0° direction following trajectories complying with said conditions.

Abstract: A composite material part and method for manufacturing the part. The part has a large variation in thickness between a first zone having a thickness E1 and a second zone having a thickness E2, which is made as a single part with a transition zone, external surfaces of which have gradients of magnitude, in which the structure of the stack includes; b1) a plurality of continuous plies that extend in the three zones; b2) a plurality of plies that extend in the first zone and in the transition zone, terminating in a stepped manner in the transition zone; b3) a plurality of plies that extend in the first zone and in the transition zone, terminating in a stepped manner in the transition zone.

Abstract: A part of composite material having a wedge between two zones, the second zone being shorter than the first zone, whose structure includes from its outer surface to its inner surface: a first section formed from at least two continuous sheets extending parallel to its outer surface, the gradient of the wedge being between 20% and 50%; a wedge in the shape of a triangular prism with its larger surface dimensioned in such a way that it forms a wedge having a gradient of less than 20%; a second section formed by a plurality of continuous sheets extending parallel to the surface bounded by the first section with the wedge placed upon it. The invention also relates to a process for manufacture of the part.

Abstract: Procedure for the manufacture of a composite material part (11) having, at least, one reinforced area (13) of greater thickness than the surrounding areas, in which the dimensions and laying up sequence of the plies (21, 21?, 21?, 21??) that are used in the laying up step of said reinforced area (13), are determined so that, at least one of the plies (21?, 21?, 21??) crosses over the ply situated beneath it for reducing the volume of said reinforced area (13). The invention also refers to a composite material part (11) manufactured with said procedure, particularly a CFRP skin of an aircraft lifting surface.

Abstract: Its object is to allow measurement of the volume of fuel (2) using optic fibre cables (3); it is characterized in that, adhered to one or more of the inner faces of the tank (1) there is at least one sheet (4) in which a plurality of optic fibre cables (3) with different lengths are included, located between the inner face of the tank and the sheet (4). One set of the ends (10) of the optic fibre cables (3) are disposed so that they are in contact with the fuel (2) when it reaches their level, thereby allowing measurement of the fuel level at all times. The preferred embodiment distributes the optic fibre cables (3) on two opposing lateral faces of the tank (1) so that they cross over one another and in opposite directions to measure any fuel level. It is applied in aeronautics.

Abstract: Aircraft component which comprises at least one panel (11) of composite material, formed by a skin (13) and a plurality of stiffening stringers (15) which are configured with a core (17) and a base (19) of width (A), said stiffening stringers (15) comprising first local flarings (21) of their bases (19) intended to provide areas for joining with other parts located in flat zones of the skin (13) and second local flarings (23) of their bases (19) which are intended to provide areas for joining with other parts located in zones of the skin (13) which include change-in-thickness ramps (33), being configured in the form of two end sections (41, 45) located above flat zones of the skin (13) and a central section (43) located above one of said ramps (33) of the skin (13), one of said end sections (41, 45) acting as an area for joining with other parts.

Abstract: Fairing (9) which closes the internal end of an elevator (3) of an aircraft with respect to the fuselage section (1) on which the fairing (9) moves, with the elevator (3) arranged on a horizontal stabiliser (2) of the aircraft, such that the horizontal stabiliser (2) moves with a trim angle (?) with respect to the fuselage section (1) in turn rotating the elevator (3) with an elevator angle (?) with respect to the horizontal stabiliser (2), with the fairing (9) maintaining a distance (6) with respect to the fuselage section (1) during its movement in which the distance (6) is a minimised distance for all movement ranges of the elevator (3) for the trim angle (?) of the horizontal stabiliser (2) and the elevator angle (?) of the elevator (3), thereby reducing aerodynamic losses through parasitic resistance which is not caused by support of the aircraft. A method for obtaining the design of the fairing (9) is also disclosed.

Abstract: Composite material part (11) with stringer (31) on ramp, manufactured from a stack of fabrics, which comprises at least one zone (13) with two sectors (17, 19) having a greater thickness than that of the surrounding zones and with the stringer (31) situated on an edge (21) of said zone (13) in which: a) each group of fabrics (27, 27? . . . ; 29, 29?, . . . ) of said sectors (17, 19) has the dimensions to form on said edge (21) a ramp with an acceptable gradient 1/p so that the stringer (31) remains situated on the ramp; b) the stacking of the zone (13) is carried out firstly by placing the fabrics (27, 27?, . . . ) of the first sector (17) and on these the fabrics (29, 29?, . . . ) of the second sector (19) in such a way that in the coinciding section (35) of said edge (21) the gradient of the resulting ramp is 1/(p/2).

Abstract: Applicable in aeronautical structures provided with a first fixed component (1) and a second component (2) displaceable with respect to the first. The first (1) and second (2) components include electrically conducting surfaces. It is characterized in that it includes a first conductive piece (6, 10) fixed to the first component (1) and a second conductive piece (9) fixed to a second component (2). The first (6, 10) and second (9) piece are joined together with the possibility of sliding one on the other, in such a way that the first piece (6, 10) is connected to the conductive surface of the first component (1) and the second piece (9) to the conductive surface of the second component (2), so that, when displacements take place of the second component (2) with respect to the first (1), the first piece (1) slides on the second piece (9) maintaining the electrical conductivity between the first (1) and second (2) component.

Abstract: A part (5) of composite material having a wedge (13) between two zones (11, 15), the second zone (15) being shorter than the first zone (11), whose structure comprises from its outer surface (21) to its inner surface (23): a first section (31) formed from at least two continuous sheets (41) extending parallel to its outer surface (21), the gradient of the wedge (13) being between 20% and 50%; a wedge (33) in the shape of a triangular prism with its larger surface (27) dimensioned in such a way that it forms a wedge having a gradient of less than 20%; a second section (35) formed by a plurality of continuous sheets (45) extending parallel to the surface bounded by the said first section (31) with the said wedge (33) placed upon it. The invention also relates to a process for manufacture of the part (5).

Abstract: The drainage valves have the purpose of removing the water accumulated in the lower part of fuel tanks of an aircraft, said valves being affix in correspondence with a lower skin forming part of said tanks. The lower skin includes recesses for the complementary housing of the heads of the valves that, in combination with some axial fastening nuts, immobilize the said valves to that skin. It is characterized in that the recesses comprise a conical structure obtained by deformation of the lower skin, and with said deformation an inner elevated seat is further obtained, on which seat the axial fastening nuts press, maintaining the thickness of the skin in the area where the valves are located, thus preventing the said area from weakening as it happens conventionally.