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Originally Posted by You Need a Thneed
Generators need fuel, so what happens if there is no fuel? That's where those little propellers come in.
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I am not 100% sure, but I dont believe fuel powered generators are used. Most "fuel" that aircraft systems use comes in the form electricity being created by the Engine itself. Usually bleed air runs a turbine I believe.
I dont believe its the case that there are gas fueled generators in the aircraft. Yes its a single point of failure, but if your engines die, you are likely dead and no backup system is of much use.
EDIT: One other thing, if you are worried about loved ones please note. The flight number of the missing plane is AF447 (Airbus A330-200). There was also an Air France 744 (Boeing 747-400)(plane type, not flight number) that took off within an hour of AF447. I think news agencies are getting passenger manifests confused a bit because of the similar numbers.