**So in this sense tailplane use was similar to that of the TriStar.**
Don't think so, however those that have flown these types can comment.
Keep in mind that with the L1011, when the pilot pulls back on the pole (or, pushes forward) the entire horizontal tailplane moves.
The entire tailplane also moves with trim input.
The elevators are not directly controlled by the pilot...IE: they are mechanically linked to the stabilizer.
AFAIK, this arrangement is unique amongst western civil jet transport aircraft.
DLC is active anytime aircraft was in in the landing configuration: 2 of the 3 engines are less than full power and the flaps greater than 30 degrees.
Certainly correct.
Note.
If a go-around is desired, the first action of the pilot is to apply go-around thrust.
By doing so, DLC is automatically disabled (active spoilers stowed), prior to moving the flaps to the 22 degree position...which would then be the next pilot action.
Full time automation...a TriStar exclusive at the time.