After two Boeing 777s lost engine thrust within a 12-month period, the National Transportation Safety Board is calling for a redesign of the Rolls-Royce engines installed on more than 200 of the jets worldwide. Minus a major redesign, "We believe that there is a high probability of something similar happening again," says acting NTSB Chairman Mark Rosenker. Rolls-Royce said last month it is already working on a new design for the engine which could be ready for installation next year. About two-thirds of the 777s in use worldwide are powered by engines from GE or Pratt & Whitney, which are not subject to the NTSB recommendation.

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