Boeing says “similar factors” were likely at play in two Trent 895 thrust rollback incidents on Boeing 777-200ER aircraft last year.

The information was revealed in an update on the incidents the airframer recently sent to operators.

Though Boeing in the update admits the circumstances are “slightly different”, the airframer says water-ice accumulation in the fuel path of the engine fuel-oil heat exchanger systems in the powerplants appears to have played role in both situations.

The most recent incident involved a Delta Airlines 777-200ER (N862DA) enroute from Shanghai to Atlanta on 26 November 2008 with 232 passengers and 15 crew. Pilots experienced an uncommanded rollback of the right Rolls-Royce engine while in cruise at 39,000ft approximately 40 minutes after a programmed step-climb. The crew was able to recover the engine after performing flight manual procedures related to the problem and descending to 31,000ft.

More high profile was the 17 January

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