Cockpit; Aircraft Systems; Hydraulic Systems; Power Plant & Propeller - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

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

COCKPIT

There are two choices of the enclosed cockpit canopies for the Turbo Thrush (1) the
SINGLE cockpit canopy or (2) the DUAL cockpit canopy. The overturn structure of both
is exceptionally strong and welded to "hard points" in the fuselage frame. The forward
bracing supports the windshield support channels and is welded to a lateral tube that is
curved to provide more head clearance. The fiberglass canopy shell has extra thickness
on the top portion and is well attached to the extra large steel tube structure so that it will
serve as a skid in case of overturn. The large canopy doors permit easy entrance to one
or both cockpits. The doors should not be removed for flight, as the aircraft performance
will be lowered. The cockpit seat belts are anchored to the seat structure, and the
shoulder harnesses are secured to a steel channel at the bottom of the seat structure.
The seats adjust vertically. The rudder pedals adjust fore and aft. The windshield is a
three-piece construction. The center section is tempered safety plate glass for better
resistance to scratching and is enclosed in a stainless steel frame. The windshield side
panels are Plexiglas and are curved to provide streamlining.

AIRCRAFT SYSTEMS

HYDRAULIC SYSTEMS

The hydraulic system consists of two master brake cylinders with hydraulic lines
connecting the master cylinders to the wheel brake cylinders. Applying toe pressure on
the rudder pedals actuates the master cylinders, which are located just aft of the pilot's
rudder pedals. A small reservoir is incorporated within each master cylinder to supply the
system with brake fluid.
POWER PLANT & PROPELLER
The Turbo Thrush is powered by the PT6, a lightweight free turbine engine incorporating
a reverse flow combustion path, designed for aircraft propulsion use. It utilizes two
counter rotating turbine sections. One drives the compressor, and the other drives the
propeller through a reduction gearbox. The latter turbine is "free" or independent of the
compressor turbine. More recent and higher-powered models incorporate a two-stage
free turbine. The PT6 has been produced in several models and has been adapted to a
multitude of uses.
The propeller has five blades mounted on a hollow hub, in the front end of which is a
servo-piston that moves forward under servo-oil pressure or rearward under feather
return spring pressure, assisted by counterweights. There are five links from the servo-
piston, one going to each blade root. These links transmit forward motion of the servo-
piston to the blade roots and pivot the blades in the decrease pitch direction. When
servo-piston pressure is relieved, the servo-piston moves rearward under feather return
spring pressure and pivots the blades in the increase pitch direction. This action is
assisted by centrifugal force of the counterweight on each blade root.

FUEL SYSTEM

A 230-gallon fuel supply is available for the Turbo Thrush. In each wing, fuel is contained
inside integral wing tanks (wet wing fuel tanks) just outboard of the wing walks. The left
wing and right wing fuel tanks are interconnected through a 5 U.S. gallon header tank that
is located in the fuselage. The fuel supply lines, to the engine, are routed from the header
tank outlet finger screen through a fuel shutoff (on/off) valve to an electric driven fuel
1-5
Effective: 9/16/05