I've have over 10,000 hours on various 747s and although I did use the wing anti-ice systems a handful of times, it was mainly to keep the other two guys happy and not because of any evidence of wing icing.
Ditto with my command experience in the L1011 type (16,000 hours and counting)...wing anti-ice selected on just to keep the other two junior crew members satisfied.
Anyone with a lot of flying experience in large swept wing turbofan powered aircraft will tell you about the same...wing/tail surface icing is simply...
not a particular problem.
Turbopropellor types?
Another story, altogether.
Can NOT link the two types.
Anyone who thinks otherwise is full of baloney....lots of it.
And yes, the problems with Viscount were most serious.
Hello?
A turbopropellor type...not a swept wing jet.
