Cirrus SR22 Pilot Operating Handbook page 469

Cirrus Design
SR22
to each flight. A sampler cup is provided to drain a small amount of
fuel from the wing tank drains, the collector tank drains, and the
gascolator drain. If takeoff weight limitations for the next flight permit,
the fuel tanks should be filled after each flight to prevent condensation.
Fuel Quantity Indicator
A dual reading 2¼" fuel quantity indicator 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
identical scale for the right tank. Each scale is marked with a yellow
arc from 0 to 14 U.S. gallons. The indicators are calibrated to read '0'
when no usable fuel remains. Each indicator also provides an output
signal to illuminate the FUEL caution light when the fuel quantity goes
below approximately 14 gallons in each tank. The fuel quantity
indications are derived from float-type fuel-level sensors installed in
each main tank. The indicator is internally lighted. 28 VDC for fuel
quantity system operation is supplied through the 5-amp FUEL QTY /
HOBBS circuit breaker on Main Bus 1.
When the fuel tanks are 1/4 full or less, prolonged
uncoordinated flight such as slips or skids can uncover the
fuel tank outlets. Therefore, if operating with one fuel tank dry
or if operating on LEFT or RIGHT tank when 1/4 full or less, do
not allow the airplane to remain in uncoordinated flight for
periods in excess of 30 seconds.
Fuel Caution Light
The amber FUEL caution light in the annunciator panel comes on to
indicate a low fuel condition. The light is illuminated by switches in the
fuel quantity indicator if the fuel quantity in both tanks drops below
approximately 14 gallons (28 gallons total with tanks balanced in level
flight). Since both tanks must be below 14 gallons to illuminate the
light, the light could illuminate with as little as 14 gallons in one tank
during level flight if the other tank is allowed to run dry. If the FUEL
caution light comes on in flight, refer to the Fuel Quantity gages to
determine fuel quantity. The light is powered by 28 VDC through the 2-
amp ANNUN / ENGINE INST circuit breaker on the Essential Bus.
13772-130
Revision 03: 05-09-11
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Section 9
Supplements
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