Nearly eighteen months on, the "solution" appears to be "melting the ice"?
Bravo ? Arse about. Why not keep the ice out of the fuel, after FIRST addressing that as the problem itself. "Previously unknown characteristics of fuel at very low temperatures?" Using an oil cooler to melt ICE that is NOT supposed to be present in the first place? For a pilot, any one peeping the pictures of ice clogged fuel lines, reading the "AD" has to be perplexing.
Pinkman, taking note of the ice build up, do you conclude the ice derives from "in spec" fuel giving up its soluble water content in long duration cruise to block crucial lines at the engine? Because that's where I am. In your experience, isn't a simpler explanation poor fuel handling? As in, tanking, sumping, pumping, storing, etc.? Is it really the Trent or are other installs vulnerable?
As AFM said, "It's the Fuel".