trimotor:
The aircraft has significant MEL restrictions relating deispatch with inop yaw dampers.
It's been a long time, but my recollection is that at least one had to be operative. And, it was two operative unless at a non-maintenance station. The altitude restrictions were significant, just as they were if one became inop enroute.
The -100 was far worse than the -200, thus more restrictive if memory serves me.