Fuel Flow Indication; Fuel Caution Light - Cirrus SR22 Pilot Operating Handbook

Section 7 Cirrus Design
Airplane Description SR22

Fuel Flow Indication

Serials 0002 through 1601, 1603 through 1643 and 1645 through
1662: Fuel flow indication is integral to the combination Fuel Flow/
Manifold Pressure Gage. Refer to preceding discussion on Fuel Flow
and Manifold Pressure Gage for complete description of fuel flow
indication.
Serials 1602, 1644, 1663 and subsequent: Fuel flow is shown as text
in the fuel data block located in the lower right section of the MFD and
is also continuously displayed in the engine data block located in the
lower right corner of the PFD. The MFD and PFD receives a fuel-flow
rate signal via the DAU from a fuel-flow transducer on the right side of
the engine in the fuel line between the engine driven fuel pump and
throttle body metering valve.
In the event fuel flow exceeds 30.0 gallons per hour, the MFD will
display "Check Fuel Flow" in a red advisory box in the lower right
corner of the MFD.
28 VDC for the digital instrument operation is supplied through the 2-
amp ANNUN / ENGINE INST circuit breaker on the Essential Bus.

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.
7-60 P/N 13772-001
Revision A5