deicing in the tropics
As an example, the A330, or 340 after a medium to long haul, landing in a humid enviro, will have cold soaked fuel in the order of -40 deg in the tip tanks. This may produce frosting on both the upper and lower surfaces.
411A, I am sure there is nothing many on this board would like to see more, than you demonstrating you superior ability in launching that puppy.