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Safety Action

Summary

The Bureau of Air Safety Investigation (BASI) released occurrence brief 9501019 on 2 February 1996. On 27 April 1999, following receipt of new information from the helicopter manufacturer concerning the identity of the part number of the fan fitted to KEB, a revised occurrence brief was issued by BASI.

The owner of KEB drew attention to a number of potential safety deficiencies in the maintenance and inspection of Kawasaki 47G3B-KH4 helicopter engine-cooling fans.

In response to the issues raised, and in recognition of the hazard to flight safety created by engine cooling-fan blade fracture, the Australian Transport Safety Bureau (formed on 1 July 1999, and which integrated the Bureau of Air Safety Investigation in a multi-modal agency) then undertook an analysis of the failure of Kawasaki 47G3B-KH4 engine cooling-fans. This analysis did not consider operational or piloting aspects, but was confined to the analysis of the cooling fan. As a result of technical analysis of this and other engine-cooling fan blade failures, the following recommendations are made:

R19990195
The Australian Transport Safety Bureau recommends that the Civil Aviation Safety Authority alert all aircraft maintenance engineers, especially those conducting non-destructive inspections, to the detrimental effects that may be created in critical components by the abrasion of surfaces during general cleaning or cleaning in preparation for nondestructive inspection.

R19990196

The Australian Transport Safety Bureau recommends that the Civil Aviation Safety Authority alert helicopter maintenance organisations and all aircraft maintenance engineers to the potentially detrimental effects of painting engine cooling fans.

R19990197
The Australian Transport Safety Bureau recommends that Kawasaki Heavy Industries clarify the bolt-tightening instructions contained in Service Bulletin 305 to establish if an allowance should be made for the frictional torque effects of self-locking nuts.

 
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