@ATCWATCHER; Remembering sim sessions regarding this in other types(havn't flown a 73) , with full nose down stab trim(runaway stab trim situation) we were able to fly and land the ac using elevator only. I remember planting my feet on the panel in order to lock the yoke with my knees in order to relieve my arms continuous pulling on the yoke. Co and I alternated doing this. AC was flyable this way at high and low speeds, it became a bit tricky when configuring for landing but fully controllable. This was on several Boeing ac and the MD11.