On January 25, 2008, an Airbus A320, N462UA, returned to Newark Liberty International Airport (EWR) shortly after departure because three of the six electronic displays providing information to the flight crew went blank and several aircraft systems became inoperative.
In the light of this occurrence, the U.S. NTSB recommends both the FAA and EASA:
Require all operators of Airbus A320 family aircraft to modify these aircraft in accordance with Airbus Service Bulletin A320-24-1120 to provide the automatic reconfiguration of the AC essential bus power supply in the event that the AC 1 electrical bus fails.
Require Airbus to develop a modification for in-service A320 family aircraft such that, in the event of an AC 1 electrical bus failure, the standby attitude indicator is powered by an additional power source that will last for a minimum of 30 minutes, and require operators to incorporate this modification as soon as possible after it is available.
Require all operators of A320 aircraft to develop new procedures, if necessary, and to provide flight crews with guidance and simulator training regarding the symptoms and resolution procedures for the loss of flight displays and systems in conjunction with an AC 1 electrical bus failure. (NTSB)