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June 2007
Information Manual 7-53
Cirrus Design Section 7
SR22 Airplane Description
Propeller
The airplane is equipped with a constant-speed, aluminum-alloy
propeller with a three-blade (78" diameter) propeller and governor.
The propeller governor automatically adjusts propeller pitch to
regulate propeller and engine RPM. The propeller governor senses
engine speed by means of flyweights and senses throttle setting
through a cable connected to the power (throttle) control lever in the
cockpit. The propeller governor boosts oil pressure in order to regulate
propeller pitch position. Moving the throttle lever forward causes the
governor to meter less high-pressure oil to the propeller hub allowing
centrifugal force acting on the blades to lower the propeller pitch for
higher RPM operation. Reducing the power (throttle) lever position
causes the governor to meter more high-pressure oil to the propeller
hub forcing the blades to a higher pitch, lower RPM, position. During
stabilized flight, the governor automatically adjusts propeller pitch in
order to maintain an RPM setting (throttle position). Any change in
airspeed or load on the propeller results in a change in propeller pitch.
June 2007
7-54 Information Manual
Section 7 Cirrus Design
Airplane Description SR22
Fuel System
An 81-gallon usable wet-wing fuel storage system provides fuel for
engine operation. The system consists of a 42-gallon capacity (40.5-
gallon usable) vented integral fuel tank and a fuel collector/sump in
each wing, a three position selector valve, an electric boost pump, and
an engine-driven fuel pump. Fuel is gravity fed from each tank to the
associated collector sumps where the engine-driven fuel pump draws
fuel through a filter and selector valve to pressure feed the engine fuel
injection system. The electric boost pump is provided for engine
priming and vapor suppression.
Each integral wing fuel tank has a filler cap in the upper surface of
each wing for fuel servicing. Access panels in the lower surface of
each wing allow access to the associated wet compartment (tank) for
inspection and maintenance. Float-type fuel quantity sensors in each
wing tank and each collector tank supply fuel level information to the
fuel quantity indicators. Positive pressure in the tank is maintained
through a vent line from each wing tank. Fuel, from each wing tank,
gravity feeds through strainers and a flapper valve to the associated
collector tank in each wing. Each collector tank/sump incorporates a
flush mounted fuel drain and a vent to the associated fuel tank.
The engine-driven fuel pump pulls filtered fuel from the two collector
tanks through a three-position (LEFT-RIGHT-OFF) selector valve. The
selector valve allows tank selection. From the fuel pump, the fuel is
proportioned to the induction airflow, metered to a flow divider, and
delivered to the individual cylinders. Excess fuel is returned to the
selected tank.
A dual-reading fuel-quantity indicator is located in the center console
next to the fuel selector in plain view of the pilot. Fuel shutoff and tank
selection is positioned nearby for easy access.
Fuel system venting is Essential to system operation. Blockage of the
system will result in decreasing fuel flow and eventual engine fuel
starvation and stoppage. Venting is accomplished independently from
each tank by a vent line leading to a NACA-type vent mounted in an
access panel underneath the wing near each wing tip.
June 2007
Information Manual 7-55
Cirrus Design Section 7
SR22 Airplane Description
SR22_FM07_1410C
THROTTLE
METERING
VALVE
In Prime mode, relay
allows high-speed pump
operation until 2-4 psi fuel
pressure is reached then
drops to low-speed
operation.
NOTE
In Prime mode, relay
allows high-speed pump
operation until 10 psi oil
pressure is reached then
drops to low-speed
operation.
ELECTRIC
AUXILIARY
PUMP FUEL
PUMP
PRIME
BOOST
FUEL
RELAY
OIL
PRESSURE
SENSOR
(LOW PRESSURE)
STARTING
CIRCUIT / DAU
GASCOLATOR
ELECTRIC
AUXILIARY
PUMP
R. WING
COLLECTOR
FILLER VENT
R. WING TANK
FILLER
OFF
FEED
RETURN
LEFT
RIGHT
FEED
RETURN
FUEL PRESSURE SWITCH
SELECTOR VALVE
OPERATION
FUEL
FLOW
INDICATOR
ANNUNCIATOR
FUEL
FUEL
QUANTITY
INDICATOR
FUEL
PUMP
PRIME
BOOST
DRAIN
(5 PLACES)
INJECTOR
　
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本文鏈接地址：AIRPLANE INFORMATION MANUAL for the CIRRUS DESIGN SR22(69)