Patent ID: 8720823

Claim:
An aircraft structural element of a central wing-box, the aircraft structural element comprising: a web with a longitudinal direction and a transverse direction; and at least one longitudinal profiled element that borders the web and that connects to the wing-box and to the wing, the at least one longitudinal profiled element including a first flat fin coplanar with and abutting a flat part of the web and connected thereto by a friction-stir-welded butt-type seam, a second fin on a first side of the first fin, and a third fin on a second side of the first fin opposite the first side of the first fin, wherein at least one of the second and third fins includes a portion with a projected width in a plane perpendicular to the longitudinal direction which increases continuously or decreases continuously along the longitudinal direction, and wherein the aircraft structural element is located at an interface between a wing and a fuselage of said aircraft.