Originally Posted by
Derfred
The EASA document is being mis-interpreted by many.
It notes that once you get to a certain point of AND trim (somewhere between 3 and 4 units from memory, varying by model), you cannot trim further AND with the yoke switches (flaps up). If you ever needed to, for an unusual reason (eg jammed flight controls), you would need to use manual trim. In normal ops, you would never need to.
This point is irrelevant to this discussion because it doesn’t prevent the yoke switches from trimming ANU, even if the aircraft has been trimmed full AND. It is a one directional limit switch only. It doesn’t prevent trim in the other direction.
Note: I’m referring to the limit switch in the forward trim range above. There is another limit switch aft which works similarly in reverse.
I hope this clears it up.
No. I take an aviation document as literal and binding. What you say may be from some private working papers, which is not an official numbered published document. So can be anything, including fake.