Document ID: chunk:federal_register_of_legislation:F2006B10742:body:0
Version: federal_register_of_legislation:F2006B10742
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

AD/HU 369/78 Four Bladed Tail Rotor Hubs 11/89

DM

            Applicability:  All MDHC 369D and 369E series helicopters fitted with four-bladed tail rotor hub P/N 369D21700-3 unless the currently fitted hub has been previously inspected in accordance with the Requirement Document.

            Requirement: Inspect the tail rotor hub in accordance with MDHC S.I.N. DN-160 or EN-50 as applicable.

            Note: Maintenance organisations will note MDHCs offer to replace unserviceable items free of charge and are urged to inspect their spares inventory forthwith.

 Compliance: 1. Helicopters with hub serial numbers 196 through 251 - before the accumulation of 10 hours component time in service after 11 September 1989.

             2. All other affected helicopters - before the accumulation of 100 hours component time in service after 11 September 1989.

            Background: One hub has been returned from service with fatigue cracks. MDHC has determined that the cracks are a result of electrical arcing caused by poor anode contact during the Tiodize coating process during manufacture.