SS: In the case of SPAO, if we are to assume that with all the displays working correctly & telling the correct information this is what was presented.
Why on Earth would anyone fly for 15 minutes with a system showing you this Christmas tree full of cautions and warnings, after at least 4 gongs and at least 5 caution/master cautions, when you know that you should land within 10?
Well, frankly you wouldn't that's clear.
Many other possibilities presumably exist, including a blank CAD having failed, or the fuel contents over-reading.
Several questions come to mind, if the CAD was blank why would anyone push their flight time beyond the 1hr30min? You would know you are not going to get any cautions. That "continue-to-fly" strategy doesn't make much sense.
The second set of questions is over the Low Fuel 1 & 2 warnings. Evidently they were triggered, but were they actually displayed, were they triggered at the correct level i.e. with 10mins fuel left and if so, why were they not acted upon?