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Boeing's "more-electric" power architecture for the 787 will face special conditions to achieve airworthiness certification by the US Federal Aviation Administration.
The extra certification requirements released by the FAA require Boeing to prove the 787 "is capable of recovering adequate primary electrical power generation for safe flight and landing" in the event of an in-flight power failure.
Originally posted by Harlequin
in the event of total failure (thats everything including all back-ups) - with NO mechanical back up anyway , all these FBW aircraft will just fall out of the sky , and if the engine and apu fail , then the ram air turbine is deployed -and boeing has to show that (and batteries) can power it.