Just an interested bystander as it’s a long time since I flew the 737, 200 and the very first 300s. I can’t remember the 73s or the 75 and 76 having a speed trim system as described here. Found them all delightfull aircraft to fly manually throughout the speed range.
So, may I ask if it so vital, to meet the arbitrary speed stability requirements of the FAA that another system , with potential for malfunction with potentially serious consequences is really needed. Do we really NEED such a system and since it IS installed is there an instant cutout switch.
When were the values of 3 pounds per 10 knots decided on and why are these exact values so important. Are current models of the 73 significantly more speed unstable than the earlier versions ?
I still remember so clearly the problems caused by runaway tailplanes on my first jets, the Canberra and Valiant. Of course I know the flight control electronics, electrics, were nowhere near so advanced or capable as on present jets.
Is the FAA using, or requiring Boeing to use a sledgehammer to crack a nut?
Just curious!