Originally Posted by
glendalegoon
JRB thanks for your expertise. I just want to understand for sure that this type has both ELEVATOR trim (tabs) and moving stabilizer? interesting. I understand about the movement to counter flap pitch change. just interesting!
Correct. The horizontal stab physically moves as the flaps extend to counteract the change in pitch induced by the flaps - and the two (flaps and hstab) are mechanically interlinked. The horizontal stab basically has 4 fixed positions for flaps up, flaps 10, flaps 20 and flaps 39. (though it does move continuously between these fixed positions as the flaps run in or out).
Once the flaps are fully retracted, the H-Stab moves back to its "normal" position, and remains fixed there, with normal trim authority coming exclusively from the elevator trim tabs.
This is different than other T-Tail biz jets, eg: the Beech 400A, where a moving H-Stab (electrically actuated) is the primary source of manual and autopilot trim - likewise for most Lears.