THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/10/05
4 – 2
POWERPLANT AND PROPELLER
SECTION ONE
GENERAL DESCRIPTION
The Turbo Thrush agricultural airplane utilizes a Pratt & Whitney Aircraft Canada PT6A-45, PT6A-
60AG, PT6A-65AG, or PT6A-67AG turboprop gas turbine engines.
AIR CLEANING SYSTEM
The prime difference between the agricultural application and a normal installation is the air
cleaning system incorporated in the engine air intake system. The lower cowl forms the inlet to the
engine. The air filter panel is a K & N cleanable barrier filter. It provides high efficiency, maximum
reliability, long service life and low overall cost.
The barrier filter unit is made of a cotton mesh with a light coat of K&N special red oil to assist in
collecting dust. The filter can be removed and reserviced I/A/W cleaning instructions from K&N P/N
99-5000 (aerosol) or P/N 99-5050 Recharger filter care service kit, obtained locally.
POWER PLANT
DESCRIPTION AND OPERATION
The PT6A-45, PT6A-60AG, and PT6A-67AG (See Figure 4-0) series power plant is a lightweight
free turbine engine. Each engine utilizes two independent turbine sections: one driving the
compressor in the gas generator section and the second driving the propeller shaft through a
reduction gearbox. The engine is self-sufficient, since its gas generator driven oil system provides
lubrication for all areas of the engine, pressure for the torquemeter and power for propeller pitch
control.
Inlet air enters the engine through an annular plenum chamber, formed by the compressor inlet
case where it is directed forward to the compressor. The PT6A-60AG and PT6A-45 compressor
consists of three axial stages combined with a single centrifugal stage, assembled as an integral
unit. PT6A-67AG has four axial stages combined with a single centrifugal stage, assembled as an
integral unit.
The engine is equipped with a wash ring at the compressor air inlet screen. A line running from this
wash ring to a port on the outside of the cowling gives the capability to cleanse the compressor
section without engine cowling removal.
R1
Summary of Contents for S2R-T660
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