Sec. 25.655 - Installation.
(a) Movable tail surfaces must be
installed so that there is no interference between any surfaces when one
is held in its extreme position and the others are operated through their
full angular movement.
(b) If an adjustable stabilizer is used,
it must have stops that will limit its range of travel to the maximum for
which the airplane is shown to meet the trim requirements of §25.161.