Originally posted by Backoffice ...
But what happens if the electrics fail?
Providing the a/c is still in one piece, the Essential Systems Service buss (ESS) will have at its disposal AC and DC power required for flight control, navigation and communication. If primary sources, e.g. main engine generators fail, the APU is available, then the Emergency generator (RAT) and then Battery banks for DC buss and an Inverter for essential AC buss powered equipment. There are alternative AC and DC buss supplies also available.
Electrical supply is not an issue.
mm43