With fuel burn a critical performance discriminator for Airbus in its challenge to Boeing with the A350, the European manufacturer has received some encouraging signs from engine supplier Rolls-Royce as it heads toward flight tests later this year. Rolls says initial results from testing of the Trent XWB‑84s delivered to Toulouse for installation on the first A350-900 show fuel-burn performance meets specification and is slightly improved over that seen on earlier flight-test units. ...

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