AD 75-13-01

75-13-01 SIKORSKY AIRCRAFT: Amendment 39-2238 as amended by Amendment 39-2879. Applies to S-58A, S-58B, S-58C, S-58D, S-58E, S-58F, S-58G, S-58H, S-58J, S- 58BT, S-58DT, S-58ET, S-58FT, S-58HT, S-58JT helicopters certificated in all categories, including Military Type HSS-1, HSS-1F, HSS-1N, HUS-1, HUS-1A, HUS-1AN, HUS-1G, HUS- 1Z, H-34A, H-34C, H-34J, CH-34A, CH-34C, HH-34F, SH-34G, SH-34H, SH-34J, UH-34D, UH-34E, UH-34G, UH-34J, VH-34C and VH-34D helicopters. To prevent operation with fatigue cracks in the main rotor magnesium stationary stars, P/Ns S1610-24013-0, S1610-24013- 1, and S1610-24013-2, accomplish the following:

(a) Prior to the first flight of each day, conduct visual inspections of stationary star for cracks in the areas around the recesses and edges surrounding the recesses, inboard of all of the trunnion lugs.

(b) For stationary stars with more than 250 hours time in service: Within 5 hours time in service after the effective date of this AD, unless alreadyaccomplished, and at 50 hour intervals thereafter, conduct dye penetrant inspections of the areas described in paragraph (a) for cracks.

(c) If a crack is found during the above inspections, replace the cracked stationary star with a star that has been inspected in accordance with paragraph (b) above and found to be free of cracks, prior to flight.

Sikorsky Alert Service Bulletin 58B10-10 covers this inspection.

Amendment 39-2238 became effective upon publication in the FEDERAL REGISTER for all persons except those to whom it was made effective immediately by telegram dated May 16, 1975.

This amendment 39-2879 becomes effective May 20, 1977.