LONDON—Swedish air accident investigators believe that a malfunction in an Inertial Reference Unit (IRU) may have sent a Bombardier regional jet into a fatal dive from which the crew was unable to recover. Both pilots died when the West Air Sweden CRJ200 regional jet, registered SE-DUX, crashed Jan. 7 into a mountainous area of Northern Sweden during a flight from Oslo’s Gardermoen Airport to Tromso, Norway. In its final report, published Dec. 12, the Swedish Accident ...


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