Cirrus SR22 Pilot's Operating Handbook And Flight Manual page 472

Section 9
Supplements
Section 4 - Normal Procedures
Holding in icing conditions for longer than 45 minutes may
reduce margins and could result in inadequate handling and
control characteristics.
Flight into known icing conditions is prohibited if porous panels
do not fully "wet-out" prior to entering icing conditions, or if
ANTI ICE CAS messages persist.
Prolonged operation of the system in clear air, above 15,000
feet MSL and temperatures less than -4 F (-20 C) can result in
"flash" evaporation of water and alcohol from the anti-ice fluid.
This evaporation results in a glycol rich fluid that could
become "gel" like on the wing surface until aircraft enters
precipitation or warmer temperatures
Limit ground operations of Lift Transducer Heat (PITOT HEAT)
to 45 seconds. Operation of Lift Transducer Heat in excess of
45 seconds while on the ground may cause excessive
temperature on the lift transducer faceplate and surrounding
wing skin.
This system is most effective when operated as an anti-ice
system to prevent ice accretions on protected surfaces. For
optimal performance, the system should be primed on the
ground to verify all protected surfaces wet-out fully. The
system should then be activated prior to entering icing
conditions to confirm the protected surfaces wet-out fully
before ice accretion begins.
The Anti-Ice System is approved for operation with ice
protection fluid that has a very temperature-dependant
viscosity characteristic. As the temperature of the fluid rises
above freezing (32F / 0C), the fluid becomes much less
viscous (thins) and pass through the porous membrane of the
panels with less resistance (pressure drop). This decrease in
pressure drop reduces the pressure in the panel reservoir
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• WARNING •
• Caution •
• Note •
Cirrus Design
P/N 13772-150
Original Issue: 02-01-13
SR22