RE: FADEC failure?
Bill.Martin - it is possible that there could have been a common-mode failure of the aircraft power supplies to the FADECs, but the FADEC's PRIMARY power sources are independent, dedicated, engine-mounted generators. A FADEC will only use aircraft power if its engine-mounted generator is incapable of supplying sufficient power, so common-mode loss of aircraft-supplied power would cause both engines to shut down only if both dedicated generators had also failed.
JC