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Was there a problem with stalling on 737 jets before the 737 Max, if not then why is MCAS needed on the 737 Max 8.If it was a problem why did Boeing wait so long.

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    $\begingroup$ All airplanes stalls. Most airplanes only stalls when the pilot instructs it to do so. The problem of Max is, it could stall itself, slowly. MACS is added to correct itself from doing so. $\endgroup$ – user3528438 Apr 28 '19 at 16:32
  • $\begingroup$ @user3528438 How is that different than a 737NG? $\endgroup$ – Harper - Reinstate Monica Apr 28 '19 at 16:44
  • $\begingroup$ The Ethiopia and Indonesia crashes did not happen slowly! $\endgroup$ – Richard L Stevens Apr 28 '19 at 16:55
  • $\begingroup$ Closely related: aviation.stackexchange.com/questions/61910/… $\endgroup$ – David Richerby Apr 28 '19 at 17:31
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    $\begingroup$ @Harper They didn't crash from a stall, they crashed when the MACS tries to correct a false stall, and it did happen across several minutes. $\endgroup$ – user3528438 Apr 29 '19 at 0:18
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Was there a problem with stalling on 737 jets before the 737 Max,

The flight characteristics, including high angle of attack operations, of the previous models of the 737 did not warrant the kind of action the MCAS system provides.

why is MCAS needed on the 737 Max 8

The Max 8 engines are physically bigger—69.4 inches fan diameter versus 61.0—heavier, mounted farther forward and higher than previously. This changed the thrust line and flight characteristics. MCAS is used to restore "normal" 737 flight characteristics.

See http://www.b737.org.uk/737maxdiffs.htm for details.

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