Cirrus SR22 Pilot Operating Handbook page 386

Section 9 Cirrus Design
Supplements SR22 / SR22T
Section 10 – Safety Information
The Ice Protection System is not intended to remove ice from the
aircraft on the ground. Do not attempt to take off with frost, ice, or
snow on flying surfaces.
Flight into known icing is prohibited. The Ice Protection System has
not been evaluated in known icing conditions. Therefore, the affects of
known icing on the system is unknown. Its purpose is to provide some
protection from the effects of ice, should an unexpected encounter
with icing conditions occur. At the first indication of icing, the most
expeditious and safest course of exiting the icing conditions should be
taken. The decision should be based on weather briefings, recent pilot
reports, ATC observations, and may include course changes or
altitude changes.
During simulated icing encounters, stall speed increases of
approximately 12 knots in the clean configuration and 3 knots in the
landing configuration were observed. In addition, cruise speed was
reduced by at least 20 KCAS and the airplanes rate of climb
diminished by at least 20%.
Even with the protected flight surfaces totally clear of ice, performance
degradation will occur due to ice on unprotected regions. The amount
of the degradation cannot be accurately predicted and it is therefore,
depending on circumstances, advisable to increase approach and
landing speeds while using the Ice Protection System. Use extreme
caution during approach and landing, being alert to the first signs of
pre-stall buffet and an impending stall.
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Revision 09: 12-17-10