Patent ID: 8607453

Claim:
A method of manufacture of a group of transverse stiffening internal ribs for a lower aft aerodynamic fairing of a mounting device of an engine intended to be interposed between a wing surface of an aircraft and the said engine, where the group includes several ribs of different sizes, the method comprising: production, for each rib in the rib group, of a given rib preform by superplastic forming, where the said preform has, seen from the front, an outline of a broadly quadrilateral shape having four corners, and a central opening traversing this rib preform; and in respect of at least one of the ribs in the group having a smaller size than that of the said rib preform, division of the said rib preform into four preform parts each incorporating one of the four corners of the said quadrilateral, followed by the joining of the four parts to one another so as to obtain the said at least one of the ribs of the group.