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AD/Y12/8 - Aircraft Flight Manual, Flight into Icing Conditions
“WARNING“WARNING
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“WARNING
Severe icing may result from environmental conditions outside of those for which the airplane is certificated. Flight in freezing drizzle, or mixed icing conditions (supercooled liquid water and ice crystals) may result in ice build-up on protected surfaces exceeding the capability of the ice protection system, or may result in ice forming aft of the protected surfaces. This ice may not be shed using the ice protection systems, and may seriously degrade the performance and controllability of the airplane.