Air data inertial reference unit: Difference between revisions

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===Qantas Flight 68===

[[File:VH-QPA Qantas Airbus A330-303 (30956003033)‘VH-QPA’ QANTAS.jpg |thumb|250x250px|VH-QPA, the aircraft involved as both flight 68 and [[Qantas Flight 72|72]]]]

On 12 September 2006, [[Qantas]] Flight 68, [[Airbus A330]] registration VH-QPA, from [[Singapore]] to [[Perth, Western Australia|Perth]] exhibited ADIRU problems but without causing any disruption to the flight. At {{convert|41000|ft|m}} and estimated position {{convert|530|NM|km}} north of [[Learmonth, Western Australia]],<ref name="ATSB_InterimReport" /> ''NAV IR1 FAULT'' then, 30 minutes later, ''NAV ADR 1 FAULT'' notifications were received on the [[Electronic Centralised Aircraft Monitor|ECAM]] identifying navigation system faults in [[Inertial Reference Unit]] 1, then in ADR 1 respectively. The crew reported to the later Qantas Flight 72 investigation involving the same airframe and ADIRU that they had received numerous warning and caution messages which changed too quickly to be dealt with. While investigating the problem, the crew noticed a weak and intermittent ''ADR 1 FAULT'' light and elected to switch off ADR 1, after which they experienced no further problems. There was no impact on the flight controls throughout the event. The ADIRU manufacturer's recommended maintenance procedures were carried out after the flight and system testing found no further fault.<ref name="ATSB_InterimReport" />