Originally Posted by
Airmann
Flew with a Captain that swore if you turned on Wing Anti Ice at top of descent and kept it on until parked it would stop the formation of hoar frost on the wing due to cold soaked fuel and would save the next crew from deicing. We had to deice the next day and he went on about his method. Wonder if anyone has come across this theory, especially given that wing anti ice only heats up the leading edge.
In addition to just the leading edge, it can actually cause more ice to form behind the protected area. If you use wing deice as anti ice, ice can form, then be melted off, to refreeze again behind the leading edge. That’s from a FCOM of one of the Boeing’s I’ve flown.