I seem to remember that turning on the A.C. in the 330 caused us to slow by 15-20kts. Once looked out and saw the engine intake glowing red, the anti ice mat had gone into thermal runaway.
I never saw any really serious things go wrong with it, I do seem to remember some of the characters flying it were a far greater hazard than the aeroplane ever was!
Happy days and great to have flown it