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SOLOY TURBINE PAC
SECTION 7
POHS CESSNA U/TU 206G
AIRPLANE & SYSTEMS
DESCRIPTION
7-18
F.A.A. Approved
October 4, 2005
PROPELLER
The airplane is equipped with an all-metal, three-bladed, constant
speed, full feathering, governor regulated propeller. A setting
introduced into the governor with the propeller control establishes the
propeller speed, and thus, the engine power turbine speed to be
maintained. The propeller utilizes oil pressure that opposes the force
of springs and counterweights to obtain correct pitch for engine load.
Oil pressure from the propeller governor drives the blades toward low
pitch (increasing RPM) while the springs and counterweights drive
blades toward high pitch (decreasing RPM). Oil pressure for propeller
operation is furnished by the propeller gearbox oil system, boosted in
pressure by the governor gear pump, and supplied to the propeller hub
through the propeller oil transfer system. To feather the propeller
blades, the propeller control on the control panel must be placed in the
feather position (OUT). Unfeathering the propeller is accomplished by
positioning the propeller control to the minimum pitch high RPM
position (IN). The unfeathering system uses governor boosted
propeller gearbox oil pressure to force the propeller out of feather.
An auto feathering system provides for automatic reduction in propeller
RPM in the event of the loss of engine power. This system is not a
total feathering device. It is intended to reduce propeller drag due to
an engine failure. The system is controlled by a pressure sensor that
automatically reduces the propeller RPM (N
P
) to 1450 RPM with the
propeller overspeed governor if the engine torquemeter oil pressure
drops below 4 PSI. An AUTO FEATHER annunciator light will
illuminate when the system is operating. To ground test the system,
check that the AUTO FEATHER annunciator light is ON prior to
starting the engine. This checks that the pressure sensor is operating.
A test button is also provided to check the auto feather solenoid and
propeller overspeed governor. With the power set at 1600 propeller
RPM (N
P
), press the test button. Propeller RPM (N
P
) will drop to 1450
RPM and the auto feather annunciator light will illuminate. Also, due to
the oil being dumped from the propeller system, an OIL PRESS LOW
light will illuminate.
CAUTION
DUE TO THE INCREASE IN THRUST
CAUSED BY THE PROPELLER
CHANGING PITCH DURING THE AUTO
FEATHER TEST, EXTREME CARE
SHOULD BE USED IF THE GROUND IS
COVERED WITH ICE OR SNOW.
UNCONTROLLED
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