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A group of airlines operating mostly brand new Boeing 777-300ERs powered by General Electric GE90-115Bs are either replacing entire engines or transfer gearboxes on individual units after GE alerted them to the potential for a gear separation.
The engine manufacturer has issued two service bulletins (SBs) to GE90-115B operators after two in-flight shut downs due to gear separation within the Avio-made gearboxes. The first event occurred on Feb. 11 when an Aeroflot 777-300ER shut down an engine enroute to Moscow from Bangkok, and the second took place on May 9, when an Air China flight from Beijing to Paris diverted to Stockholm after the left engine had to be shut down in flight.
Although no specific root cause has yet been identified, GE says a material “anomaly” has been identified during early analysis of the transfer gearboxes concerned.
Originally posted by Zaphod58
...or at least one engine replaced with an older engine to ensure that one of the engines has an older gearbox that is not from the suspect batch.