The original MCAS was designed for 0.5 degree changes. Test pilots found out this did not work, and it was changed to the 2 cycles of 2.5 degrees.
5 degrees nose down, repeatedly, at lower altitudes is far more significant than stab runaway, and look at those effects. Wonder what the trim wheel revolution speeds are under MCAS...that has to be inspiring!
So, the flight testing showed the ac was inherently unstable in the test conditions. It would be very helpful to see what the conditions are that trigger the MCAS.
Last edited by Smythe; 21st Mar 2019 at 15:57.