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NTSB: contaminated wing caused fatal Challenger crash in Colorado
2 May 2006

The NTSB determined that the probable cause of a Challenger jet crash in Montrose, CO was the flight crew`s failure to ensure that the airplane`s wings were free of ice or snow
contamination that accumulated while the airplane was on the ground. This failure resulted in an attempted takeoff with upper wing contamination that induced the subsequent stall and collision with the ground. The NTSB recommended the FAA to develop visual and tactile training aids to accurately depict small amounts of upper wing surface
contamination. FAA should then require all commercial
airplane operators to incorporate these training aids
into their initial and recurrent training. (NTSB)