Boeing advised 737 pilots to pay careful attention to flight information . Dutch officials said a faulty altimeter contributed to the crash . Erroneous altitude data caused automatic throttles to slow the plane down . The Turkish Airlines 737 broke into three pieces on impact , killing four people .
Boeing urges 737 pilots to pay careful attention to flight instruments . Dutch investigators said a faulty altimeter contributed to Netherlands crash . Erroneous altitude data caused automatic throttles to slow the plane down . The Turkish Airlines jet broke into three pieces on impact , killing nine people .