Aircraft Structure; Fuselage; Wing; Empennage - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL

AIRCRAFT STRUCTURE

FUSELAGE

The fuselage is comprised of a welded tubular steel frame, fiberglass hopper, and
detachable skins. An overturn structure forms an integral part of the fuselage frame. The
frame structure, fittings, bushings, brackets, and so forth are fabricated from 4130
chrome-moly seamless steel tubing.
As a corrosion preventative, hot linseed oil is pumped throughout the entire welded
structure. On an average, 12 gallons are pumped into the frame and 11 to 11 ½ gallons
drain out, leaving a residual coating on all members. The exterior of the frame is
sandblasted, etched, and primed, which is followed by two coats of polyurethane paint
that is resistant to chemical reaction.
The fuselage is covered with heat treated Alclad panels attached with camloc fasteners.
Side skins can be removed using only a screwdriver, thus exposing the fuselage frame
for thorough cleaning and inspection. All skins are supported clear of the fuselage tubing
to prevent accumulation of corrosive chemicals. The seams and lap joints of the skin
panel support structure are sealed with a special compound to eliminate chemical action
between the mating surfaces. Each skin panel is etched, primed, and painted before
assembly to insure complete coverage. All bottom fuselage skins around the hopper
opening and aft to the tail post are made of stainless steel. The skin fasteners in the high
corrosion areas are also stainless steel.

WING

The wing has a constant chord of 90 inches, and is all metal, full cantilever design. The
massive main spar is a tension field beam structure constructed from Alclad webs and
high strength heat-treated steel caps. All wing skins, ribs, and leading edges are
constructed from Alclad heat-treated material. The leading edge structure is made
especially strong to minimize denting and is riveted with universal rivets for strength. The
fuel tanks, which are located in the inboard section of the wing, are an integral part of the
structure. Close pitch riveting of the seams, substantial reinforcement, and flexible
sealants minimize chances of rupture in crash conditions. Drain holes are provided in
adjacent bays to prevent accumulation of fuel in the event of a leak. The ailerons and
flaps are all metal construction and are hinged on ball bearings. The flaps are electrically
operated by push rods and are completely sealed against chemical entry. Flap hinges
are stainless steel.

EMPENNAGE

The horizontal stabilizer, elevator, rudder and vertical fin are an all-metal structure. All
skins, ribs and leading edges are constructed from alclad material. The movable surfaces
are hinged on sealed bearings that can be easily replaced. The rudder and the elevator
have aerodynamic balances that are protected by overhangs on the fixed surfaces.
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Effective: 05/05/04