The Australian Transport Safety Bureau (formerly the Bureau of
Air Safety Investigation) recommends that Rolls Royce Commercial
Aero Engine Limited review Rolls Royce RB211-524D4 engine cold
stream nozzle inspection criteria to minimise the possibility of
failure during operation.
1) A world wide communication was sent to all RB211-524D4
operators, Boeing and Rolls-Royce resident service representatives
on 06 January 2000 alerting them to this incident, subsequent
findings by the affected operator, the position of the cracks and
the proposed method of inspection.
2) A mandatory Non Modification Service Bulletin (NMSB),
RB211-78-C955, has been issued detailing the inspection of the
affected area, the actions required should cracks be found and the
availability of a method of repair.
The need for future inspections will be decided when the results of
further analysis and laboratory tests become available and should
subsequent inspection be necessary a further issue of the NSMB will
be made.
