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diameter) propeller.
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.
March 2010
7-56 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Fuel System
A 56-gallon usable wet-wing fuel storage system provides fuel for
engine operation. The system consists of a 30.3-gallon capacity (28-
gallon usable) vented integral fuel tank in each wing, 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. An access panel in the lower surface of
each wing provides access to the associated wet compartment (tank)
for general inspection and maintenance. Float-type fuel quantity
sensors in each wing tank provide 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 check valve to the associated collector
tank/sump 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.
Fuel quantity indicators for each tank are 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.
March 2010
Information Manual 7-57
Cirrus Design Section 7
SR20 Airplane Description
SR20_FM07_1828B
THROTTLE
METERING
VALVE
NOTE
In Prime mode, relay
allows high-speed pump
operation when the oil
pressure is less than 10 psi.
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
SELECTOR VALVE
OPERATION
FUEL
FLOW
INDICATOR
ANNUNCIATOR
FUEL
FUEL
QUANTITY
INDICATOR
FUEL
PUMP
PRIME
BOOST
DRAIN
(5 PLACES)
INJECTOR
MANIFOLD
FIREWALL
VENT
L. WING TANK
L. WING
COLLECTOR
FUEL
RELAY
ENGINE DRIVEN
FUEL PUMP
MIXTURE CNTL.
FLAPPER
VALVE
FLAPPER
VALVE
SELECTOR
VALVE
Figure 7-10
Fuel System Schematic
March 2010
7-58 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
The airplane may be serviced to a reduced capacity to permit heavier
cabin loadings. This is accomplished by filling each tank to a tab
visible below the fuel filler, giving a reduced fuel load of 13 gallons
　
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