Boeing urges three pilots to pay careful attention to flight instruments . Dutch investigators said a faulty altimeter contributed to Istanbul crash . Erroneous altitude data caused automatic throttles to slow the plane down . The plane was on automatic pilot when it crashed , said Pieter van Vollenhoven , head of the Dutch Safety Board . The Turkish Airlines jet broke into nine pieces on impact , killing three people .
Boeing urges three pilots to pay careful attention to flight instruments . Dutch investigators said a faulty altimeter contributed to Istanbul crash . Erroneous altitude data caused automatic throttles to slow the plane down . The Turkish Airlines jet broke into nine pieces on impact , killing three people .