

Given the mechanical saftey built into those switches, Unfortunately I guess that leaves us with two reasonable possibilities:
A) One of the pilots was somehow mistaken on the function of those switches and toggled them when they should not have. Then they genuinely thought they hadn’t when asked why they had cutoff fuel.
Or
B) One of the pilots chose to cut off fuel supply to both engines, intentionally bringing down the plane. They then lied to the other pilot when asked why they’d cutoff fuel.
Both the left and right switchs were moved to ‘cutoff’, one pilot recognized this and asked the other pilot why, the other pilot denied doing it, then the switches were returned to ‘run’ and the engines began to re-light (this is all stright from the black box recorder). It was too late to recover though, so the plane went down.
There is a mechanical detent requiring you to pull each switch out, then down. They had to be moved deliberately.