Boeing OKed it and our local EU-authority is happy with that.
As they should be, frost from cold fuel is common...it seems the new guys who haven't been around in airline flying very long have a fit about it.
Nothing new, either.
Now, lets look at wing anti-icing on large (heavy) swept wing jet aircraft.
I flew the 707 in command for seven years, and did not once use wing anti-ice
No problems noted.
Now, after flying the L1011 for thirty years, used wing anti-ice perhaps half a dozen times...and only then because the airplane is equipped with an airframe ice detector, and the new First Officer bacame agitated and thought we would fall out of the sky, otherwise...gotta keep the co-pilot happy.
