To allow Boeing to stick to the mechanical trim, why do they not gear the manual trim wheels ?
It is geared..the gear on the back of the manual trim wheel, is chain driven down to a gear on the front cable drum. Cables running the length of the ac, just the tension required for that is enormous.
A derailleur system would overly complicate an already complex mechanical system. If anything, any sort of variable drive system would have to be shaft driven.
yoko1 if this was as simple as pilot error and training, the ac would not have been grounded for over 90 days (and looking at 270)