quote Airplane is not operated in known or forecast icing conditions.unquote
Ballyboly,
The forecast icing condition is AS(if not more) important as operated in known icing.Therefore avoiding to arrive for a cat 3 and as you said having to go around.
It would have to be a real nice high pressure,clear skys day from my place of departure to my destination to accept inop engine anti ice.(737)
For the rest maybe one should read the definition of Icing conditions.....
