Lion Air Boeing 737's crash reason :
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In particular, with the sensor falsely indicating that the nose is too high, when it isn’t, it causes an automatic system response that “trims” the horizontal tail of the plane to begin putting the plane’s nose down.
At the same time, it causes an indicator of the minimum speed to tell the pilot that the plane is near a stall, which also causes the pilot’s control column to shake as a warning. And the airspeed indicators on both sides of the flight deck disagree.
The pilots can use extra force to correct the nose down trim, but the failure condition repeats itself, so that the nose-down push begins again 10 seconds after correcting.
“If the nose is trimmed down on an aircraft, it becomes difficult for the crew to hold it,” said the person briefed on Boeing’s bulletin. “The nose is turning itself down and they are having to fight it. It takes a lot of effort to keep it from diving. Especially if you have a crew that’s confused and doesn’t know what’s going on.”
This description fits exactly the flight pattern of the Lion Air jet that crashed.
For 12 minutes before it crashed, the altitude swung up and down as if the pilots were fighting to maintain height, bringing the plane up, then having it swing down again repeatedly.
- Comments:
- > I crash landed it
Reminds me of the pilot that wanted to learn to fly but not land. :-)// bad joke