https://www.msn.com/en-au/news/world/et ... spartandhp
And probably included turning the system off and on repeatedly!"The crew performed all the procedures repeatedly...……………..
And probably included turning the system off and on repeatedly!"The crew performed all the procedures repeatedly...……………..
This was a system glossed over by Boeing, with minimal training on its function and performance.
The preliminary report suggests this is not the case. Their repeated actions were pulling back desperately on the stick in an attempt to raise the nose. It’s not clear, to me at least, whether the MCAS system can be turned on or off from within the cockpit. If it can, it wasn’t included in the revised data provided by Boeing and the crew followed the checklist.
From what has been published the MACS system was required for certification because of the size and moved position of the new engines. Their new position caused a big change in the aerodynamic characteristics.PeteC wrote: ↑Fri Apr 05, 2019 1:37 pm Logically the solution to all of this for Boeing is to just remove the system completely from all aircraft. I don't recall reports of planes stalling and falling out of the sky before so why introduce all these new innovations when statistics show little benefit. It's removal would give the buyers and the flying public much peace of mind as well.
Yes, the system CAN be turned off, the same as it has always been on B737's.J.J.B. wrote: ↑Fri Apr 05, 2019 1:26 pmThe preliminary report suggests this is not the case. Their repeated actions were pulling back desperately on the stick in an attempt to raise the nose. It’s not clear, to me at least, whether the MCAS system can be turned on or off from within the cockpit. If it can, it wasn’t included in the revised data provided by Boeing and the crew followed the checklist.
The new version of the 777 was just introduced. We'll have to see if the engines are more forward on that as well.Nereus wrote: ↑Fri Apr 05, 2019 1:57 pmFrom what has been published the MACS system was required for certification because of the size and moved position of the new engines. Their new position caused a big change in the aerodynamic characteristics.PeteC wrote: ↑Fri Apr 05, 2019 1:37 pm Logically the solution to all of this for Boeing is to just remove the system completely from all aircraft. I don't recall reports of planes stalling and falling out of the sky before so why introduce all these new innovations when statistics show little benefit. It's removal would give the buyers and the flying public much peace of mind as well.
Yes, basically the larger size engine cowling, mounted further forward, generated lift at high angles of attack that caused a pitch up moment which would resist attempts to recover from a stall condition and that was what this system was supposed to stop. The flaw seems to be that the system could be triggered by one angle of attack sensor failure.Nereus wrote: ↑Fri Apr 05, 2019 1:57 pmFrom what has been published the MACS system was required for certification because of the size and moved position of the new engines. Their new position caused a big change in the aerodynamic characteristics.PeteC wrote: ↑Fri Apr 05, 2019 1:37 pm Logically the solution to all of this for Boeing is to just remove the system completely from all aircraft. I don't recall reports of planes stalling and falling out of the sky before so why introduce all these new innovations when statistics show little benefit. It's removal would give the buyers and the flying public much peace of mind as well.
While it's not clear from the report exactly what steps the pilots took, their struggles to keep the plane climbing apparently led them to switch power back on to the trim system. About 30 seconds before they crashed, it was activated by the pilots to slightly raise the nose.
The following is all that I can find, and that from a guy I know that fly's B737's:J.J.B. wrote:Of critically important note, the crew performed the procedures as they had been laid down by Boeing for such an eventuality. You know as much about checklists as anyone here, if you are following them according to your training and what’s written in the POH, what else would you do?