Thanks 411A
Interesting that the SAS was full time. Obviously control system design stopped it flighting pilot inputs.
Did these unique TriStar features make it difficult for crews to move to say a DC-10 or 747 interchangably? As you'll know BA operated all three wide bodies for a while after it absorbed BCal so multi-type certified pilots were probably desirable.
Regardig the variable incidence tail plane, the 727 and other T-tails moved the whole thing during rotation ( & for trimming but stand to be corrected) , but not sure if only the elevators were used for pitch control in other phases of flight. I suppose that when large moments are required the whole stabiliser moves on most modern jets 747 and DC1-0 included.