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0 pointsmike_john237y ago0 comments

You can see the previous flight made by the same lion air plane that crashed here[1]. They not only did not declare an emergency but they contained the flight as normal and flew for over an hour with no MCAS and no electric trim.

[1]: https://leehamnews.com/wp-content/uploads/2018/11/Previous-f...

I should point out they found the stab cut out procedure by trial and error and were able to maintain control of the plane simply by counteracting the errant downward trim. The reason the Ethiopian plane crashed is that they didn't execute the airspeed disagree procedure and left the throttles on basically maximum.

Yes MCAS is an issue, But since no one on this site has gotten this right I might as well point that out

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cjbprime7y ago

You're saying that IAS disagree and unreliable airspeed ought to have caused them to throttle down? That seems counter-intuitive. If you don't know how fast you're going, how are you supposed to avoid stalling?

Are you looking at a specific QRH entry? What does it say?

cmurf7y ago

On what basis do they follow the IAS disagree procedure, and not the procedure in emergency AD 2018-23-51?

KNKT's preliminary report says the prior flight, Lion Air 34, was not airworthy due to continuous stick shaker activation. Further, that flight expressly requested a much lower altitude, citing control problems for that request. Neither are normal.

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