Commonwealth legislation

AD/HU 369/78 - Four Bladed Tail Rotor Hubs

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Commonwealth

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legislative instrument

Plain English Summary

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Requires operators of MDHC 369D and 369E helicopters fitted with four‑bladed tail‑rotor hub P/N 369D21700‑3 to inspect the hub in accordance with MDHC S.I.N. DN‑160 or EN‑50, unless that hub was already inspected. (Requirement)

Inspections must be done by specified component‑time limits—hub SN 196–251 before 10 component hours after 11 Sep 1989; all others before 100 hours. (Compliance) Operators bear inspection costs, must check spares stock, and act because a fatigue crack linked to a manufacturing coating fault was reported. (Background)

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AD/HU 369/78 - Four Bladed Tail Rotor Hubs

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters

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

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.

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.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/HU 369/78 - Four Bladed Tail Rotor Hubs