PB
During this time the Capt made some remarks about fuel dumping and a thick white vapour trail billowed out from begind the outboard wing on my side of the plane which was on the outside of the turn( I have seen fuel vented from a 74 and I think can tell the difference from a wing tip vortex) If the venting is only on centre tank could the centrifugal force effect have drifted the centre tank dump vapour out that far as we turned??
My understanding / recollection of the 767 is that yes, you can only dump (on some 767s only) the Centre Tank Fuel. However, as you say, that fuel is dumped someway out on each wing. Sounds complex - it is! The fact the fuel is coming from the wing does mean it is coming from the tank(s) in the wing!
NoD