SOLOY TURBINE PAC
SECTION 7
POHS CESSNA U/TU 206G
AIRPLANE & SYSTEMS
DESCRIPTION
7-13
F.A.A. Approved
October 4, 2005
A two-stage helical gear set in the engine power and accessory
gearbox reduces rotational speed from 33,290 RPM at 100% N
2
power
turbine speed to 6016 RPM at the output drive spline. A flex coupled
drive shaft is connected to the Soloy gear reduction system which uses
a single-stage helical gear set in the propeller gearbox to reduce
rotational speed from 6016 RPM at the input drive to 1810 RPM at the
propeller output at a reduction ratio of 3.32:1. The engine is rated at
418 shaft horsepower on a standard day at sea level, with 101.4 PSI of
indicated torque at 1810 propeller (N
P
) RPM. The speed of the gas
producer (N
1
) is the true speed of the compressor side of the engine
which is 53,519 RPM at 105% N
1
. Maximum permissible overspeed of
the engine is 54,028 RPM which equals 106% N
1
.
The power turbine gear train drives the propeller tachometer generator
and the power turbine governor. The compressor, fuel pump, gas
producer tachometer generator, gas producer fuel control, starter
generator and the vacuum pump are driven by the gas producer gear
train. The rest of the accessories are driven by the Soloy propeller
reduction gearbox. These include the propeller governor, propeller
overspeed governor, and the propeller gearbox oil pump. A spare
accessory pad is also drive by this gear train.
The Turbine Pac oil supply is contained in an integral tank. The
system has a capacity of 9 U.S. quarts and is provided with a dipstick.
ENGINE CONTROLS
The propulsion system is operated by a set of three controls. They
consist of the power control, propeller control, and fuel cutoff control.
POWER CONTROL
The power control in the cockpit is connected to the gas producer
fuel control unit on the engine. The power control controls engine
power through a machined gate system for the full power range.
With the power control pulled out and rotated to the left, the
engine will be operating in the GROUND IDLE mode and the
mode pointer will be on GROUND. FLIGHT IDLE is obtained by
pushing the power control in to the fixed stop and rotating it to the
right so the mode pointer is on FLIGHT. The remaining power
range can be obtained by pushing the power control in to increase
the engine power. A friction lock is located at the base of the
power control and is operated by rotating the lock clockwise to
increase friction or counter clockwise to decrease friction
UNCONTROLLED
COPY