Cockpit; Aircraft Systems; Hydraulic Systems; Power Plant & Propeller - Thrush Aircraft S2R–T660 Maintenance Manual

THRUSH AIRCRAFT INC – T660 TURBO THRUSH
The overturn structure 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.
The hydraulic system consists of two master cylinders and hydraulic brake 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.
(Refer to manuals listed in Chart on Page 1-4 in this Section.)
The S2R-T660 Turbo Thrush is powered by the PT6, a lightweight free turbine engine incorporating
a reverse flow combustion path, is 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.
Effective: 01/10/05
AIRCRAFT MAINTENANCE MANUAL

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