@infosecdj Loss of power would do it. One of the procedures in an air incident which leaves the plane flyable is to pull the breaker after landing. Redundancy is a big thing in aviation so I'd expect multiple generators. Possibly one per engine.
But a loss of the wiring or a tripped breaker would cut power to the recorders.
If there was a complete loss of power (all engine stop) then the plane would be powered by the RAT which only gives enough power for basic instruments and controls.
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