If you're around Bristol, UK, I recommend to visit Aerospace Bristol which has a Concorde museum and it explains the role of the flight engineers. Rebalancing

If you're around Bristol, UK, I recommend to visit Aerospace Bristol which has a Concorde museum and it explains the role of the flight engineers. Rebalancing fuel tanks was a major thing in Concorde indeed. I don't remember details exactly, but to maintain the supersonic speed, Concorde needed to be in a certain position, and to maintain that position, fuel would have to be rebalanced regularly.