The ice theories are the most enticing. I talked to a QF engineer today who was totally convinced it was ice blocking the fuel-oil heat exchangers. So if we accept for a moment that this hypothesis is correct, can someone explain how this fairly large quantity of ice made it's break for freedom and evaded the air accident investigators? Is it possible it melted and ended up on the grass?
The trouble I still have with the ice theories is that, if there is ice in the fuel tanks, it can't end up all in one place. Some would have to be still in the wing tanks waiting to be discovered.