Originally Posted by CONF iture
If it was the case the THS would have reach its physical NU stop.
What did stop its operation ?
I seem to remember that you have already conceded that
A33Zab's
proposal that the PRIMs prevented any further NU of the THS after the ADRs returned NCD at around 02:11:50 [or while they returned NCD].
If that was correct, the alternative may also apply to SS ND in the same circumstances, whereby the THS may not follow the ND demand until the PRIMs allowed it. In that case, the use of the Manual Trim Wheel would be needed to resolve the situation quickly.
This situation was apparently not foreseen, and the clarification you are seeking would be welcome.