Trying to understand how a faulty ADR can generate a NAV IR fault report (Qantas), how it can contaminate the automated systems without being detected/cross checked as an outlier (although there are two other valid measures):
The QANTAS Airbus A330 Inflight upsets maybe of interest. There were two different cases for Qantas. This risk was also present with the Boeing777 (
FAA emergency AD 2005-18-51)
A contributor with a professional experience in avionics failure modes raised the possibility that the IRU declared itself as faulty as it was measuring (true) accelerations or rotations known as outside from the normal flight enveloppe.
Jeff