42 of 52 P/N 13772-151
Section 9 Cirrus Design
Supplements SR22T
If the system is ON and PUMP BKUP is selected, #1 pump will operate
(if not failed) based on the mode setting (NORM or HIGH) while #2
pump operates continuously (PUMP BKUP), causing the range and
endurance to decrease from the published values, e.g. selection of
HIGH and PUMP BKUP will reduce range and endurance as if MAX
were selected.
The manifolds of both metering pumps are connected in series and
primed by an integral windshield/priming pump which draws fluid from
the tank, through both metering pump manifolds, forcing the fluid to
the windshield spray nozzles. In the event the metering pumps cannot
prime themselves, the windshield/priming pump can be activated to
draw fluid from the tank to prime the metering pump manifolds and to
remove any entrapped air between the metering pumps and the fluid
tank(s). A normally-closed solenoid located between the windshield
pump and spray nozzles prevents fluid back flow to the metering
pumps.
From the metering pumps, deicing fluid is pushed through a filter
assembly, mounted adjacent to the pumps, and then carried through
nylon tubing to the proportioning units located in the cabin floor-
forward and empennage.
•The cabin floor-forward proportioning unit distributes fluid to the
LH and RH Wing Inboard and Outboard panels and propeller
slinger ring assembly.
•The empennage proportioning unit distributes fluid to the
horizontal and vertical stabilizer panels and the elevator tip
panels.
In addition to distributing fluid to the porous panels and propeller
slinger ring, the proportioning units provide an additional, distinct
pressure drop to the supply lines such that a specific flow rate is
provided to each protected surface.
Porous Panels
The proportioned fluid enters the leading edge panels through the inlet
fitting(s) on the inboard end of the wing and elevator tip panels, upper
end of the vertical panel, and the outboard end of the horizontal
panels. The outer surface of the panels is perforated with very small
openings to distribute the deicing fluid along their entire length. The
panels contain a porous membrane whose pores are nearly 100 times
Original Issue: 02-01-13
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