58-22-04: Tail Rotor Drive Shaft

58-22-04 SUD AVIATION: Applies to All Alouette II SE 3130 Helicopters Except Serial Numbers 1168, 1169, 1170, 1175, 1176 and 1177. Compliance required (1) inspection prior to next flight and (2) rivet replacement by November 15, 1958. Due to sudden engine and rotor synchronization which may result upon completion of clutch engagement, stresses applied to the overall drive may be considerably increased. This can cause the shearing of rivets which hold the tail rotor inclined drive shaft tube to the yokes of the universal joints. Sud Aviation issued the following corrective measures which French SGACC considers mandatory: A. Prior to Next Flight: (1) Remove the tail rotor inclined drive shaft assembly as directed in instruction sheet P.I. 4404 of periodic inspection manual; (2) Check that the center lines of the bores in the yokes at each end of the shaft are parallel and lie in the same plane; (3) If drive shaft assembly is satisfactory, index the relative positions of the tube and yoke by means of a line of paint; (4) Repeat inspection after any sudden clutch engagement until compliance is shown with B. B. Prior to November 15, 1958: Replace the two diametrically opposite rivets on both ends of the tail rotor inclined drive shaft assembly. Sud Aviation P/N 67.20.000 which attaches to the universal joint fork with bolt, Sud Aviation P/N 67.21.103. (Sud Aviation Service Bulletin AL 67.11.140 and Modification Proposal V-42 cover this same subject.) (CAA telegraphic instructions of October 20, 1958, contained this information.)