flight Q z8501 went down in stormy weather on December 28 during what was supposed to be a shot flight from the indonesed tuesday,
Indonesia's offical National Transportation safety committe said a major factor was a fault with a system that helps cobtrol the rudder's movement.
Cracked soldering in the component caused it to malfunction and send
repeated warning messages to the pilots. when they received the fourth warning,the pilotspulled circuit breakers on one od the aircraft's computer, removing power from the faulty system in a bid to reset it. But in doing so,they also turned off the plane's autopilot