US safety officials want the Federal Aviation Administration to improve the way in which crosswind data is collected and shared with pilots at airports downwind of mountainous terrain. This follows the investigation of a Boeing 737-500 overrun at Denver two years ago.
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The National Transportation Safety Board determined the main cause was the captain not properly controlling the aircraft for the extreme and unexpected crosswind conditions during the take-off run.
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The NTSB says that a study conducted by the National Centre for Atmospheric Research showed mountain wave conditions were present at the time of the accident, resulting in strong, localised westerly winds with intermittent gusts as high as 45kt that crossed the aircraft's path during take-off ground roll.
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The board also says that airport wind displayed on the controller's ribbon display terminal at the time of the accident would have shown 35kt winds from the west with 40kt gusts.