AD 75-10-04

75-10-04 HUGHES HELICOPTERS: Amendment 39-2196. Applies to Hughes model 369, 369A, 369H, 369HM, 369HS, and 369HE helicopters certificated in all categories including Military YOH-6A and OH-6A equipped with aluminum tail rotor blades, part number 369A1613 or 369A1613-3. To determine if cracks exist in the root fittings of the tail rotor blades and assure timely rework of the fittings accomplish the following:

A. Perform a close visual check by the pilot in command, or inspection by a certificated mechanic on any day the helicopter is operated, in accordance with Part III of Hughes Service Information Notice No. HN-83, dated April 15, 1975 or later FAA approved revisions. Comply with Part II of the notice for those blades specified therein prior to the first daily check or inspection. Remove all cracked blades from service prior to further flight. Note: The person who performs the check or inspection shall record it in the appropriate aircraft records per FAR 91.173.

B.Within the next 50 hours time in service, unless already accomplished, comply with Part I of Hughes Service Information Notice No. HN-83, dated April 15, 1975 or later FAA-approved revisions. Remove all cracked blades from service prior to further flight. Continue the checks or inspections specified in paragraph A. above.

C. For blades in spares inventory, including blades on spare tail rotor assemblies, accomplish Parts I and II of the Hughes S.I.N. No. HN-83, dated April 15, 1975, or later FAA- approved revisions, at or before installation on helicopter.

D. Equivalent checks, inspections and rework may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.

E. Aircraft may be flown to a base for performance of that work required by paragraph B., above, of this AD, per FARs 21.197 and 21.199."

This amendment is effective May 12, 1975, for all persons except those to whom it was made effective immediately by airmail letter dated April 17, 1975.