Machinbird A33Zab, Thank you for posting the drawing of the spring rod (or cartridge).
It appears to be an elegant design in that the same springs work in compression during both extension and compression of the cartridge. Additionally, it appears that one of the springs is of a non-linear design and does not follow Hooke's Law.
I like this forum very much for such a design-picture, thank you A33Zab
but machinbird I am shure, there is a smal mistake in the drawing both springs will work in hook´s law, but the bigger(purple) spring IMO is a few mm shorter than shown, there is more space on the yellow side..... so first you press the weaker green spring and later you have to ad the hooks force of green and purple
so we have a redundant system with two catridges, well gums it can be a herring but if one of the green spring was broken then I am shure this is not easy to detect on the taxiway, the SS feels full ok for left/right/up+down and only the force for 1/3 pull is half of normal........ remember we search for the smalest possible defekt who can explains the action of the PF shown on the FDR!
If Grity's chart of control motions is accurate (and not overly interpolated/smoothed) then PF used an inappropriate control strategy.
the basis of my chart was the datas shown in interimreport3 s.29 (F/O pitch and roll command position) I used 2 valus/sec put both together for 2D and smoothed a splinline over it.... so it is little interpolated but not much,
it looks not as he has made pulses ore something like this in this time.....
much more interesting for the control strategy is if you overlay the sidstickway with the left/right asceleration, which was also left-right-left-right-left in this 10 sec with values +/- 0.1 g