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Safety analysis and this analysis of this new augmented flight control system had crucial flaws including understating its power and the statement that boeing's engineers submitted to the f.a.a. they called a complete failure of the system a potential complete failure they were able to hazardous rather than catastrophic which would have meant more and longer testing now we have to remember the failure of this malfunctioning of this system was responsible for the crash of the lion air flight in october and the most recent crash of ethiopian airlines flight three hundred two shows similarities s...

Safety analysis and this analysis of this new augmented flight control system had crucial flaws including understating its power and the statement that boeing's engineers submitted to the f.a.a. they called a complete failure of the system a potential complete failure they were able to hazardous rather than catastrophic which would have meant more and longer testing now we have to remember the failure of this malfunctioning of this system was responsible for the crash of the lion air flight in october and the most recent crash of ethiopian airlines flight three hundred two shows similarities s...

>> reporter: the second boeing 737 to crash in the last eight months in the first to go vertically into the sea killing all 189 on board. in both cases radar showed similar violent oscillations, pitching up and down before the plane crashed. in this case there were other problems, that plane had maintenance issues with airspeed and other gauges. it is the latest generation of boeing at 737 with more powerful, fuel-efficient engines necessitating a redesign of the plane's trim controls. where the two trim control switches are turned off and the plainest powered up it causes a different reaction...

Control the plane. very similar to the crash of lion air flight 610 off indonesia last october. that plane also a boeing max 8. now 22 airlines and a handful of countries including ethiopia, indonesia and china are grounding the max 8 until the investigation determines whether the crashes are related. sky news reporter is at the scene. >> reporter: the big question has the same thing happened or it is just a statistical anomaly that we have here, two of the same aircraft crashing in a short period of time. >> reporter: investigators in ethiopia have recovered the plane's black box. they will l...

The plane is powered up it causes a different reaction than an earlier models. >> when you apply full power to the airplane, it's going to drive the nose up. so, what boeing did to counter that is they alternated it. >> if the trim switch is turned off or malfunctioning a poorly trained pilot might have problems overcorrecting for the nose up with the pitch down it can produce what's called pilot induced oscillation as scene? nasa video. the officer in the air crash had 200 hours of fly time compared to a minimum of 1500 hours for u.s. first officers. the flight and voice data recorders have b...