Airbus issued an Operators Information Telex to all operators of its aircraft in the wake of the Australian Transport Safety Bureau's investigation into the Qantas A330-300 incident on Oct. 7. The instruction advises crews to shut down the entire Air Data Inertial Reference Unit No. 1 in case of partial failure, which would isolate both IR and ADR to prevent the ADR from continuing to provide erroneous data. The A330 has three ADIRUs. ATSB found that "the aircraft was flying at FL370 with ...

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