Well, well. Now tell us something that we don't know. We certainly
knew all of that. What we still don't know, and even you haven't
given the answer, is at what fuel in the main tank is unusable if
both transfer pumps fail at the same time. If by 215 kgs with a bit
of cunning, you mean pulling nose up to slosh some fuel through the
overflow ports, that's not what we were after.
As I said, even the Eurocopter System Description books don't give
the main tank fuel level at the ports. Going by the schematic
diagram of the fuel tank on the CAD, it would seem to be about 300kg,
with resorting to aerobatics to squeeze out the last drops.