Empennage; Empennage Removal; Empennage Installation - Thrush Aircraft S2R–T660 Maintenance Manual

EMPENNAGE

The vertical stabilizer, rudder, horizontal stabilizer and elevators are constructed of Alclad aluminum. All
stabilizers are connected to the fuselage structure by bolts and supported by adjustable struts. Rudder and
elevators are attached to the stabilizers by hinges containing sealed bearings. See Section VII, Flight
Controls, for rigging instructions.

EMPENNAGE REMOVAL

A. Remove rudder and elevators from stabilizer as outlined in this section of the manual.
B. Remove horizontal struts, being sure to mark left and right. (The top of the struts can be identified
by a small rectangular section of weld line at the V-end of the aft tube.)

EMPENNAGE INSTALLATION

A. Install horizontal stabilizer with AN6-46A bolts on forward attaches with one each bushing (P/N
9040-018) (9/16" long) between horizontal stabilizer and forward fuselage attach fitting. Place one
each bushing (P/N 9040-108) (1 ¼" long) between the aft stabilizer attach fitting and the fuselage
fitting and install AN6-44A bolts. Torque bolts to 408 ± 15 inch-pounds of torque. Check that the
cord line of the horizontal stabilizer is -.75º ± .25º (this means nose down) relative to the wt. & bal.
Leveling longeron (under the cockpit) (see figure 7-18). Use up to 3 ea. AN960-616 washers under
either the fwd or aft bushings to achieve the required incidence angle.
B. Install left and right struts using the strut/plates and AN5-6A bolts on lower attach (strut to fuselage)
and AN6-12A bolts on upper attach (strut to horizontal). Install rudder lock plate on left lower strut
attach; tighten all bolts and nuts.
When installing a new strut or new strut parts, accomplish as follows:
With new strut(s) adjust fork ends as required to bring the strut as close as possible to lower
fuselage attach without touching. The strut should be centered fore and aft with fork ends. The
forks should be shimmed with a P/N 40024-3 spacer and P/N 21194 washers as required (different
thicknesses are available) and at least one P/N 21194-C copper crush washer. Then torque to at
least 100 inch-pounds and not more than 190 inch-pounds and align with attach points
simultaneously. The lower strut/plates can now be
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THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
** CAUTION **
The forked ends of the struts are torqued to align
with horizontal attachments.
fork will require re-torquing as outlined in the
installation instructions.
Movement of the
Effective: 01/10/05
R1