Abstract: The object of this invention is a stiffener stop in particular for a primary structural panel of the “skin+stiffener” type for aircraft, said stop consisting of an initial slope connected to the normal height of the stiffener and a final slope, wherein at least one interval having a slope nearly equal to zero with respect to the plane of the base skin in the stop area is inserted between the two aforesaid slopes.

Abstract: A fuselage spar for aircraft is vertically mounted between an upper surface panel and a lower surface panel of the fuselage at the junction between a first wing structure spar and a second wing structure spar symmetrical with the first wing structure spar relative to the fuselage, and comprises peripheral zones and a central zone. This fuselage spar comprises a hollowed-out portion in the central zone, the peripheral zones of the spar providing for a draining of the normal loads conveyed by the wing structure spars. Also disclosed is a central spar box comprising such a spar.

Abstract: A device for joining, in particular, composite structure elements with metallic structure elements of an aircraft. The device includes a junction element, provided with a first longitudinal partition wall fastened to a metallic panel, integral with a stiffener comprising a vertical core and at least one baseplate, with a second longitudinal partition wall, fastened to a composite panel, and with a lower branch to which are connected the proximal extremities of the said first and second longitudinal partition walls. The device further includes a first fitting element, provided with a first pick-up fitting body on the said stiffener and with a first heel and a second fitting element, provided with a second pick-up fitting body on the composite panel, and with a second heel, the heels of the fitting elements being fastened to the lower branch, on both sides of the lower branch, opposite each other.

Abstract: A device for joining, in particular, composite structure elements with metallic structure elements of an aircraft, comprising a junction element, provided with a first longitudinal partition wall fastened to a metallic panel, integral with a stiffener comprising a vertical core and at least one baseplate, with a second longitudinal partition wall, fastened to a composite panel, and with a lower branch to which are connected the proximal extremities of the said first and second longitudinal partition walls, the device comprising, moreover, a first fitting element, provided with a first pick-up fitting body on the said stiffener and with a first heel and a second fitting element, provided with a second pick-up fitting body on the composite panel, and with a second heel, the heels of the fitting elements being fastened to the lower branch, on both sides of the lower branch, opposite each other.

Abstract: A fuselage spar for aircraft is vertically mounted between an upper surface panel and a lower surface panel of the fuselage at the junction between a first wing structure spar and a second wing structure spar symmetrical with the first wing structure spar relative to the fuselage, and comprises peripheral zones and a central zone. This fuselage spar comprises a hollowed-out portion in the central zone, the peripheral zones of the spar providing for a draining of the normal loads conveyed by the wing structure spars. Also disclosed is a central spar box comprising such a spar.

Abstract: The object of this invention is a stiffener stop in particular for a primary structural panel of the “skin +stiffener” type for aircraft, said stop consisting of an initial slope connected to the nornal height of the stiffener and a final slope, wherein at least one interval having a slope nearly equal to zero with respect to the plane of the base skin in the stop area is inserted between the two aforesaid slopes.