Cirrus DESIGN SR22T Pilot Operating Handbook page 406

Section 9 Cirrus Design
Supplements SR22 / SR22T
smaller than the openings of the outer surface. The leading edge of
the panel serves as a reservoir as fluid entering the panel fills the
cavity behind the porous membrane then overcomes this resistance to
be distributed by the openings in the external surface. The inlet fitting
of the inboard wing porous panel also supplies fluid to the porous stall
strip through an additional capillary tube which further proportions the
fluid to provide a specific flow rate to the stall strip. Each panel
incorporates a vent opposite the inlet which provides a relatively large
opening to release air from within the panel. A check valve prevents air
from entering the panel through the vent which slows the "leak-down"
of the panel during periods of inactivity
Windshield Spray Nozzles and Pump
The windshield pump, located adjacent to the main metering pumps
beneath the LH passenger seat, supplies fluid to the windshield
nozzles. The pump also acts as a priming pump for the main metering
pumps. In the event the metering pumps cannot prime themselves, the
windshield pump may be activated to purge the system of any
entrapped air between the main metering pumps and the fluid tank.
Propeller Slinger Ring
Deicing fluid protects the propeller by a slinger ring mounted to the
spinner backing plate where the fluid is distributed by centrifugal
action onto grooved rubber boots fitted to the root end of the propeller
blades.
Fluid Quantity Sensing
Fluid quantity is measured by a float type quantity sensor installed in
the deicing fluid tanks. A single-point fluid level switch is installed near
the outlet of each tank to provide a redundant "Empty" indication to
prevent the system from drawing air. An ultrasonic flow meter installed
between the in-line strainer and the metering pumps continuously
senses the system flow rate. The fluid quantity and flow rate
information is sent to the Engine Airframe Unit, processed, and
transmitted to the Engine Indicating System for display.
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Revision 04: 12-17-10