An assembly includes a structural wall and a composite wall extending in the extension of the structural wall and defining a second section positioned facing a first section of the wall. The assembly includes an elongated traction element received in a first passage made in the structural wall, the first passage opening out into the first section and into a cell made in the structural wall. The composite wall defines a second passage opening out into the second section and receiving the elongated element. The assembly includes a locking member added onto the elongated element. The composite wall delimits an access cavity connecting an outer surface of the composite wall to the second passage. The locking member is received into the access cavity.