FLSCU
What he means is that, when the hi level sensors in the inner tanks become wet the refuel valves are shut. Normally when this occurs the xfr valves are closed and the outers are full, but in this case they are open an the outer tanks are empty, but the refuel valves close anyway.
I cannot see a case where this can pose a problem (a delay). Maybe that is why they don't mention it in the FCOM. If we need all the fuel, we can just wait until the airplane is energized to complete the fuelling. It will never be the cause of a delay.
Anyway it would be nice to have the info in the FCOM.
By the way, any expert can solve for me a mistery?
What is the electrical supply source for the FLSCU? Or it doesn't need it?
I have been looking at the AMM but I can't see it. I also don't understand that apparently it is a dual system, with FLSCU 1 and 2, and there are also channels, A and B. Probably it is not very important but I would like to know