British investigators have concluded that ice in the fuel lines "most probably" caused the non-fatal crash of a Boeing 777 at London Heathrow in January. In response, the FAA plans to issue within days a new safety directive for 777 pilots flying in extreme cold weather. The problem appears limited to some 220 of the planes equipped with Rolls-Royce engines. More than 50 such jets are registered in the U.S., most operated by American Airlines and Delta Air Lines.

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