Boeing urges 737 pilots to pay careful attention to flight instruments . The FAA has ordered a full investigation into the cause of the crash and is looking at whether there was any mechanical or human error in the plane's operation. Erroneous altitude data caused automatic throttles to slow the plane down . More than 6,000 have been sold , according to Boeing . The Turkish Airlines jet broke into three pieces on impact , killing nine people .
Boeing urges 737 pilots to pay careful attention to flight instruments . The FAA has ordered a full investigation into the cause of the crash and is looking at whether there was any mechanical or human error in the plane's operation. Erroneous altitude data caused automatic throttles to slow the plane down . The Turkish Airlines jet broke into three pieces on impact , killing nine people .