From my research the 787 has 4 generator/starters connected through gear boxes. All 4 being mechanically linked with auto and manual disconnects.
Any plausible scenarios, an (1)engine failure, and pre-existing electrical issues could’ve caused all four generators to fail, or unintentionally be switched off. Which would deploy the rat, even if one engine was still going strong?
There is, but I dont know how the 787 electrical system works... I know its a full electric airplane with no bleed air so the electrical system is pretty stout I would think.
When I flew the 747 there was no checklist for loss of all A/C power i.e. losing all 4 generators at the same time. Boeing says its basically impossible. I heard of one where the E&E bay got soaked with water somehow and they lost all 4 generators due to a short from the water. The other couple are 4 engine flame outs due to volcanic ash. Another was supposedly mechanics blocked the generator cooling inlets while they were washing the engines and forgot to uncover them and all 4 generators over heated... 787 has liquid cooled generators I believe.
But to lose all 4 generators at the same time is a statistical improbability... I wont say impossible because, well...ill be proven wrong. The electrical system on the 787 SHOULD be designed so it doesnt have a single fault failure mode.
In 19 years in the airlines I have never lost a generator. I had a CSD drive light come on at idle power before on the 737, but the generator itself was still functioning. Low oil pressure in the CSD.