I've been flying 737, 747 and 757 for 32 years, and procedure in one of the worlds largest airlines has always been, 'below -40C, anti-icing is not needed, unless you are in a descent, where it may be switched on in anticipation of entering icing conditions'. That, is standard procedure. I don't recall it ever failing in all that time.
I really have no idea about special Airbus definitions or requirements. I still don't understand thottles that don't move. The OP is asking about Boeings as evidently that is what he is studying. If you are going to take the trouble to answer his query, it is worth seeing where he is coming from and not confuse him with other types' special procedures.