But, the fact those switches were off can only be a pilot's action. Either they didn't do a pre-flight check that would have placed the switches on, or confirmed them on, or one actually turned them off.
Will be interesting to learn if a simulator reveals that they could take off with them off or not, would enough fuel be in the lines to get off the ground before running dry.
The plane wouldn't have taken off, or even taxied on the runway, if the fuel switches were off.
Watch: What we know about the fuel switches on Air India flight 171
A preliminary report investigating the Air India crash finds both fuel switches were moved to the off position.
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