Abstract: A cross-beam for a floor structure of an aircraft includes a web having opposing end sections configured to connect to opposing structural sections of an aircraft fuselage and at least one stepped section. The stepped section is formed by a displacement of the web in a direction corresponding to a normal axis of the web.

Abstract: A stiffening element for stiffening a surface structure of an aircraft includes a web and a foot configured to connect to the surface structure. The foot includes an inner section near the web and an outer section further from the web than the inner section. The outer section has a greater elasticity than the inner section. Disclosed is a stiffening element 10, for example a T-, I-, L-, Z-, J or Omega-stiffener, of a fiber-reinforced composite material, for purposes of stiffening a surface structure 12 of an aircraft, whose at least one foot 18, 20 has sections 32, 34 with differing stiffnesses; also disclosed is a surface structure 12 for an aircraft with stiffening elements 10 of this type.

Abstract: The present invention provides a profiled part, for use, in particular, within an aircraft or spacecraft, the profiled part comprising at least one hollow profiled part portion and a T-shaped and/or L-shaped profiled part portion.