In the context of the wings of aircraft, the ability to compensate for variations in movement and to absorb assembly tolerances, and flexibility for mounting, are all desired. An object of the disclosure thus relates to a wing portion of an aircraft, having a connecting device between a rigid structure and a flexible structure, the connecting device being attached to a structural element of the wing portion via the intermediary of an attachment support, wherein the attachment support is mounted in translation on the structural element by at least one translation spindle. The disclosure is applicable in the field of aeronautics, in particular for the hydraulic equipment of an aircraft.