Thanks for that Sky Sports, that's genius, we hadn't thought of that.
SOMETHING made him feel that all was ok.
DrinkGirls, I can appreciate that Dave was your mate and until that night he wasn't a risk taker, but the point I'm trying to make is that of basic fuel calculating.
Forget switch positions, warning lights, audio warnings etc. for one minute. He knew his fuel load on take-off, he knew the burn rate, he knew his endurance, he knew his flight time. He/they accepted that last tasking with an aircraft fuel state that was already lower than the aircraft had landed with in the last 125 sorties.
Even if the aircraft systems were all lying to them, and they had no warnings at all, Dave must have been thinking, I've been up for 1:37 this is going to be tight.
After that kind of flight time, what could possibly make him think that all was ok.