PPRuNe Forums - View Single Post - Boeing admits flaw in 737 Max flight simulator
Old 19th May 2019, 21:47
  #31 (permalink)  
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Join Date: Jun 2009
Location: florida
Age: 81
Posts: 1,610
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Salute!

Good friggin' grief!!

The damned thing is not "anti-stall" or "stall prevention". It had to be added to the other kludges to keep "control" forces higher at higher AoA. Stall AoA is higher than MCAS activation, but if the plane requires less and less "control" force to increase AoA, then it will not satisfy the FAR requirements.
I am not sure where "they" are measuring "control" forces, so maybe FCeng or "racer" could add to the discussion versus all the "fly the plane" folks. Using control column force is not a valid test because Boeing already has sfwe and hdwe in the way between the elevator and yoke connections. Maybe PEI could also contribute, as he has some commercial plane test experience.
If we are talking about what the pilot feels, then all bets are off, because the plane has crapola gettin in the way already. If we are talking about the 737block 1, mod 0 then we have actual cables and such to measure the tension and so forth.
If we are measuring the tension back at the elevator hinge ( see diagrams we had from back in November), I would be more comfortable. In other words, we are seeing a changed pitch moment resulting from the new engine mounts and who knows what else compared to the grandfather plane so many claim is easy to fly and any "competent" pilot could have avoided the crashes.

Back to the BBQ now.

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