PieChaser
Surely the AIB would drain all the fuel at the crash site.
Why would they take out and measure 95 litres, then transport a severely damaged aircraft all the way from Glasgow to Farnborough and only then see where the remaining fuel might be??
I think the AIB might just know to level the craft and measure fuel from all drain points.
PC, not necessarily, that might entail some complicated on site engineering work. Maybe, again as said earlier, they only had the capacity to physically take 95 litres and determined that the tanks were secure. Have you forgotten that the skids were quite damaged, so I guess getting a sample from a level airframe would not be as easy as you seem to think. Yes of course they'd know to level it, perhaps that's just what they did when it got to Farnborough.