Can I ask a newbie question about the inability to shut down the No1 engine? It seems to a mere engineer like me that even if control of the fuel shut-off valves was lost (I take it that they are of a bi-stable design thus requiring an active "open" signal and an active "close" signal) why was it not possible to cut off power to the fuel pumps thus killing the flow to the engine from there? The plane was on the ground so killing fuel flow, even to all engines, shouldn't be an issue.
Thanks.