7-46 P/N 21399-004
Section 7 Cirrus Design
Airplane and Systems Description SR20
Fuel Indicating
Fuel quantity is measured by float-type quantity sensors installed in
each fuel tank and displayed on the Fuel Quantity Gage.
• Caution •
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.
• 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 Quantity Gage
Serials 2016 thru 2155:
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
28 U.S. gallons in 2½-gallon increments. The RIGHT pointer sweeps
an identical scale for the right tank. Each scale is marked with a yellow
arc from 0 to 8.2 U.S. gallons. The indicators are calibrated to read 0
gallons when no usable fuel remains and are internally lighted.
The fuel quantity gage provides output signals to the Engine Airframe
Unit based on the float sensor positions in the fuel tanks. The output
signals are processed and transmitted to the CAS window for display.
28 VDC for fuel quantity system operation is supplied through the 3-
amp FUEL QTY circuit breaker on MAIN BUS 1.
Serials 2156 and subs:
A dual reading fuel quantity gage is displayed on the Engine Strip
along the left edge of the MFD and in the Fuel Qty block of the
ENGINE page. In the case of an electronic display failure (backup
mode), all essential fuel information is displayed on the Engine Strip
along the left edge of the PFD. The LEFT pointer indicates left tank
fuel quantity and sweeps a vertical bar scale marked from 0 to 28 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 band from
Revision A1
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