If I didn't tell you where the data came from below you would say it is classic closed loop software oscillation. Consider the variables along with the control surfaces that must be corrected real time in the horizontal vs. a vertical rocket landing...actually more complex the Boeing problem. Then you have two sensors processing an algorithm on a design where Boeing pushed the engines forward and messed up the center of gravity. 1. Air Speed 2. Planes Variable Weight with fuel in the wings and changing real time 3. CFM engine blade shape vs. air speed 4. Humidity 5. Temperature 6. Hysteresis of controlled surfaces to s/w commands 7. Density of Air 8. Altitude 9. Pilot fighting the controls (the blind variable) 10. Rain, Sleet, Snow on plane conditions, control surfaces, and electro-mechanical movement 11. Sensor variations or systematic performance (we know how that killed the first set of passengers) Now think of all those variables pushed into an algorithm and having to manage in a horizontal solution for safety of this plane. It's monumental to consider would you get on this plane knowing your life depends on 11 variables and some software programmer. So how to fix with margin...The way would be to setup a model simulator based on the above variables and run a DOE/RSM analysis on JMP (One cannot do single variable analysis...it's all dynamic). Once all the variables are studies, of course find the critical ones, how they interact, and any directionality. The scary one is the pilot...and eventually have to test the algorithm with and without pilot intervention. The R2 fit of the equation out of JMP needs to be at least 95% confidence or back to the drawing board. Oh...also there are several differential equations of fluid flow that would need to be validated as part of the engineering study. I am not sure who is working on the problem at Boeing...and doubt anyone at FAA could fully comprehend the challenge of solving the software and hardware controls. If the LION crash was analyzed a normal engineer would have said, this is closed loop oscillation and grounded all the planes the minute it was noted. Of course the fix would be to re-engineer the plane and engine back to the center of gravity and we know that is not going to happen. I would have to view the analysis before I would consider jumping on the 737MAX planes again!
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