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.
As a result of technical analysis of the fan blade failures, the
Bureau simultaneously issues the following recommendations:
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.
R19990195
The Australian Transport Safety Bureau recommends that the Civil
Aviation Safety Authority alert all aircraft maintenance engineers,
especially those conducting nondestructive 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.