Danish Investigation Board concluded in a preliminary report that the most recent SAS Q400 landing gear malfunction, which caused the airline to pull the turboprops permanently from its fleet (ATWOnline, Oct. 30), was caused by an O-ring that became lodged in the right main gear's actuator, the mechanism that lowers and extends the gear. Investigators determined that this was a different cause than the carrier's two previous Q400 incidents, during which landing gears collapsed as the ...

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