Ho hum, yes...the 'probably' at the end of my post is meant to mean 'all other things being equal' but I was too lazy to elaborate. There are any number of extra factors which may come into play e.g. the FZRA causing severe icing (I am assuming everyone is familar with most aircraft being certified for light or moderate only), the runway being a sheet of ice, the AOM specifically prohibiting it etc. etc., however that was not the question. The question was 'is landing in FZRA allowed' and the answer to that is yes. Or if you like - yes unless there is another reason for not doing so.