AD
The AD (per se) is a step not taken lightly by the FAA and its supplicants. Where is the usual grumbling? Fuel Burn, grumble grumble. Workload issues, grumble grumble, Training costs, grumble grumble. I think crews were (have been all along) cognizant of the hazards. This smells of dancing around the issue, political correctness, what have you. The Trent may have "weak links" that only show when water is in fuel. Is this on the Trent? NO, on the fuel side, in my opinion. I guess the FAA stopped short of demanding a different F/O heat exchanger (for example), but what remains is a tacit forbearance of ignorance of what has up to now been strict guidelines surrounding fuel composition, transport, storage and oversight.
AF