Air Safety Week :: ADIRU: Culprit in Qantas Incident on the Qantas A330 incident and also on Wiki a reference to a A320 flying on 2 ADIRU (in line with MLE), losing a second one on approach to Heathrow in poor weather and accidentally resetting the third ad consequently losing all sense of attitude and direction and then having to disengage automatic throttle responses triggered by erroneous flight data.
As a computer jockey there seems to be a pattern emerging here.