As an academic pureish chemist I applaud the clarity, thoroughness and measured tones inherent within this interim report. As ever, impressive stuff from the AAIB.
I have learnt that with 20 20 hindsight "on", I suppose it's blindingly obvious that water - even at the ppm level and at levels well within the fuel's spec, can be a problem if there's enough of the fuel being cold soaked to generate enough ice to block the HP pump inlets.
I will do some sums when I have a little more time.
As has been pointed out already, the implications of all this could be far reaching. Fly lower when it's "cold" is obvious but we shall need to redefine parameters based on proper data and there looks to be a lot of work to do here.
Fuel costs will be likely to rise and be yet another pressure on ticket prices.
CW