Sensor damaged by a foreign object on Ethiopian Airlines 737 MAX triggered fatal crash
crashing into the ground, two aviation sources familiar with the investigation told ABC News.
One source told ABC News that they manually attempted to bring the nose of the plane back up by using the trim wheel. Soon after, the pilots restored power to the horizontal stabilizer. The preliminary findings in the crash investigation are expected to be released by transportation officials in Ethiopia on Thursday morning.
In both crashes, the Boeing 737 MAX aircraft struggled to maintain a steady flight path. The planes repeatedly lost and gained altitude before entering a dive to the earth's surface. In the two incidents, a new anti-stall safety system on the MAX that controls trim -- MCAS -- was activated, sources have told ABC News.Commercial airline pilots are trained to disengage the system in the event of runaway trim, when the airplane is making unexpected pitch movements.
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