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provides the following functions:
• LEFT Allows fuel to flow from the left tank
• RIGHT Allows fuel to flow from the right tank
• OFF Cuts off fuel flow from both tanks
The valve is arranged so that to feed off a particular tank the valve
should be pointed to the fuel indicator for that tank. To select RIGHT or
LEFT, rotate the selector to the desired position. To select Off, first
raise the fuel selector knob release and then rotate the knob to OFF.
Fuel Pump Operation
Fuel pump operation and engine prime is controlled through the Fuel
Pump switch located adjacent to the fuel selector valve. The PRIME
position is momentary and the BOOST position is selectable. A twospeed
prime allows the fuel pressure to rapidly achieve proper starting
pressure.
An oil pressure based system is used to control fuel pump operation.
The oil pressure/oil temperature sensor provides a signal to the
starting circuit to generate a ground for the oil annunciator and the fuel
system. This system allows the fuel pump to run at high speed
(PRIME) when the engine oil pressure is less than 10 PSI. Whenever
the engine oil pressure exceeds 10 PSI, pressing PRIME will have no
effect. Selecting BOOST energizes the fuel pump in low-speed mode
regardless of oil pressure to deliver a continuous 4-6 psi boost to the
fuel flow for vapor suppression in a hot fuel condition.
The fuel pump operates on 28 VDC supplied through the 5-amp FUEL
PUMP circuit breaker on MAIN BUS 2.
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-41
Figure 7-8
Fuel System Schematic
CHECK
VALVE
CHECK
VALVE
THROTTLE
METERING
VALVE
FIREWALL
FUEL
PUMP
GASCOLATOR
SR22_FM07_2528B
NOTE
In Prime mode, relay
allows high-speed pump
operation until 10 psi oil
pressure is reached then
drops to low-speed
operation.
OIL
PRESSURE
SENSOR
(LOW PRESSURE)
ENGINE
AIRFRAME
UNIT
FUEL FLOW
SENSOR
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
PRIME
BOOST
DRAIN
(5 PLACES)
INJECTOR
MANIFOLD
VENT
L. WING TANK
L. WING
COLLECTOR
FUEL
RELAY
ENGINE DRIVEN
FUEL PUMP
MIXTURE CNTL.
FLAPPER
VALVE
FLAPPER
VALVE
SELECTOR
VALVE
March 2010
7-42 Information Manual
Section 7 Cirrus Design
Airplane and Systems Description SR22
Fuel Indicating
Fuel system information is displayed as analog-style gages and text
on the MFD’s ENGINE page. When the ENGINE page is not active or
in the case of an electronic display failure (backup mode), fuel flow is
displayed along the LH edge of the display. Fuel data is acquired by
the Engine Airframe Unit which transmits the data to the Engine
Indicating System for display as described in the following pages.
• Note •
A “Red X” through any electronic display field indicates that
the display field is not receiving valid data and should be
considered inoperative.
Fuel System Annunciations
Fuel system health, caution, and warning messages are displayed in
color-coded text in the Crew Alerting System (CAS) window located to
the right of the Altimeter and Vertical Speed Indicator. In combination
with a CAS alert, the affected fuel parameter displayed on the
ENGINE page changes to the corresponding color of CAS alert and
the annuncation system issues an audio alert.
• Note •
For specific pilot actions in response to Fuel System
Annunciations, refer to the Fuel System procedures contained
in Section 3 - Emergency Procedures, and Section 3A -
Abnormal Procedures.
For additional information on Engine Instrument Markings and
Annunciations, refer to Section 2 - Limitations.
For additional information on the System Annunciations And
Alerts, refer to the Perspective Integrated Avionics System
description in this section.
Fuel Quantity Gage
A dual reading 2¼” fuel quantity gage is installed on the console
immediately forward of the fuel selector valve. The LEFT pointer
indicates left tank fuel quantity and sweeps a scale marked from 0 to
46 U.S. gallons in 5-gallon increments. The RIGHT pointer sweeps an
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西锐20飞机信息手册 SR22 AIRPLANE INFORMATION MANUAL 2979(65)
