The angle of attack sensor is a vane on the wing that gauges air flow to determine if the wing is generating enough lift.
That air flow can be disrupted if the plane slows down or goes into too steep a climb, putting the plane in danger of stalling. In that situation the 737 MAX has a pitch trim system that automatically pushes the nose down to prevent a stall.
in the event of a faulty reading from the angle of attack sensor, the pilots should disengage the system so it will automatically push the nose down to prevent stall.
(According to FDR of Lion Air 737 crash, pilots seems failed to disengage the system)
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