Empennage; Empennage Removal; Empennage Installation - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
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.
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.)
The forked ends of the struts are torqued to align with
horizontal attachments. Movement of the fork will require re-
torquing as outlined in the installation instructions.
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 350-380 inch-pounds of torque. Check that the cord line of
the horizontal stabilizer is -0.50º ± .25º (this means nose-down) relative to the
leveling longeron used for weight and balance (under the cockpit) (see figure 7-
12). 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 160 - 190
inch-pounds and align with attach points simultaneously. The lower strut/plates
can now be trimmed to fit if needed and drilled with a .312 (5/16") drill bit and
bolted into place using AN5-6A bolts. If only re-torque is required and torque
cannot be achieved with old shims, the replacement of the copper crush washer
only should be sufficient to regain correct torque (100-140 inch-pounds) and
proper angle for alignment.
7-12
AIRCRAFT MAINTENANCE MANUAL

EMPENNAGE

EMPENNAGE REMOVAL

** CAUTION **

EMPENNAGE INSTALLATION

Effective: 9/16/05