Green-dot (post #1805),
Many thanks for taking the AAIB report apart more carefully than I did.
However, how effective is sumping? The report quotes no figures, just the conclusion from the review: "there was no evidence of any significant quantities of free water having accumulated..."
And also "If so, and water sumping was done correctly, there would be very little water in the tanks. This, together with sumping on 14 january during maintenance should imply the tanks were virtually free of water as G-YMMM departed to Beijing."
All this is qualitative, not quantitative, which made me wonder whether we were talking about 5 ltrs, 20 ltrs or 100 ltrs being "significant" or "virtually free of water"..
But, going back to the report, the amount of water estimated in the Bejing fuel upload was in the order of 40 ppm (the 5 ltr quoted). The samples taken after the crash were in the same order.
So, for the moment, it looks as if I'm barking up the wrong tree.
Bedankt, Green-dot!
CJ