weather conditions conducive to the formation of ice on an aircraft in flight
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These conditions are usually characterized by visible moisture in the air and temperatures around the freezing level. Pilots encountering icing conditions are urged to issue a pilot weather report (PIREP) immediately.
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Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennumeteoroloogia
If icing exceeds the intensity of icing for which the aircraft is certified or if an aircraft not certified for flight in known icing conditions encounters icing, the commander shall exit the icing conditions without delay, by a change of level and/or route, if necessary by declaring an emergency to ATC.