` But the more complex automation becomes , the more challenging it is to ensure that the pilots adequately understand it , '' Christopher Hart , the acting safety board chairman said in a statement . The National Transportation Safety Board released its final report on the 2013 accident . A preliminary investigation found that a mechanical failure in one of the plane's engines caused it to veer off course and crash into a mountain near Mount Rainier, Washington. The Boeing 777 crashed short of the runway ; three people were killed , 187 hurt .
The National Transportation Safety Board released its final report on the 2013 accident . A preliminary investigation found that a mechanical failure in one of the plane's engines caused it to veer off course and crash into a mountain near Mount Rainier, Washington. The Boeing 777 crashed short of the runway ; three people were killed , 187 hurt .