Originally Posted by
BOAC
henra - it has been stated that the THS locks in one of the failure modes - ie autotrim ceases to function. Regarding 'translation', I feel that if FCOM Vol 3, Supplementary Techniques, Flight Controls, Flight Mode. (3.04.27 P3) did not mean 'locked' (in English) then it should say so?.
Hmm maybe we still have a different notion of the word 'locked'.
I understand that in Abnormal law as well as in Direct law Auto Trim is lost/disabled and the THS will stay in the last position unless manually manipulated by the Trim wheel.
However, I'm not aware that there is any kind of blockage/hindrance against manual operation of the Trim. Just the system won't do it for you any more automatically. Effectively you change plane from A to B.
Also the schematics which have been posted point in that direction.