Cirrus SR22 Pilot Operating Handbook page 380

Section 9
Supplements
Ice Protection System - Serials with G3 Wing
The system consists of six porous panels, propeller slinger ring, two
proportioning units, metering pump, priming pump, filter, in-line
strainer, fluid tank, filler cap and neck, test port assembly, electrical
switching, system plumbing, and (Serials w/ Perspective Avionics)
deicing fluid level sensor. The system operates on 28 VDC supplied
through 5-amp ICE PROTECTION circuit breaker on Main Bus 1.
Storage and Distribution
The 3.5 gallons (13.2L) deicing fluid tank is serviced through a filler
located on the upper LH wing skin. The tank is a sealed wet bay,
integral to the wing structure, bounded by the upper and lower wing
skins, main spar web, and the inboard, outboard, and lateral tank ribs.
The tank is vented from the outboard rib to a NACA style duct attached
to an access panel on the lower wing skin, just outboard of the tank. A
course-mesh outlet strainer mounted internal to the tank prevents
large objects from obstructing the tank outlet, while a fine-mesh in-line
strainer protects the metering pump and primping pump from damage
by contaminates.
Upon activation, a two-speed metering pump, mounted below the LH
passenger seat, draws fluid from the tank and provides fluid pressure
to the system at a constant-volume flow rate. Low pump speed
provides the required flow during NORMAL operation and high pump
speed during HIGH/MAXIMUM operation. The manifold of the
metering pump is primed by an integral priming pump which draws
fluid through the manifold and returns it to the tank. A check valve
between the priming pump and the tank prevents back-flow of fluid to
the metering pump. The priming pump operates for the first 10
seconds of system operation. In the event of the loss of prime, the
priming pump can be activated to draw fluid from the tank to prime the
metering pump manifold.
From the metering pump, deicing fluid is pushed through a filter,
mounted adjacent to the pump, 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.
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Cirrus Design
SR22 / SR22T
P/N 13772-115
Revision 09: 12-17-10