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}}</ref> On a 21 May 2009 [[Miami]]-[[Sao Paulo]] [[TAM Flight 8091]] registered as PT-MVB, and on a 23 June 2009 [[Hong Kong]]-[[Tokyo]] [[Northwest Airlines]] Flight 8 registered as N805NW each saw sudden loss of airspeed data at cruise altitude and consequent loss of ADIRS control.<ref>{{cite press release| url=http://www.ntsb.gov/news/2009/090625a.html |title=NTSB investigating two recent incidents involving possible A-330 speed and altitude indication anomalies |publisher= [[NTSB]] |date=25 June 2009 |accessdate=14 October 2011}}</ref><ref>{{cite web |title=Brief of Incident |url=http://www.ntsb.gov/_layouts/ntsb.aviation/GeneratePDF.aspx?id=DCA09IA055&rpt=first |date=18 July 2011 |publisher=NTSB }}</ref><ref>{{cite web |title=Brief of Incident |url= http://www.ntsb.gov/_layouts/ntsb.aviation/GeneratePDF.aspx?id=DCA09IA064&rpt=fi |publisher=NTSB |date=27 June 2011 }}</ref>
===Ryanair Flight 6606===
On 9 October 2018, the [[Boeing 737 Next Generation|Boeing 737-800]] operating the flight from Porto Airport to Edinburgh Airport suffered a left ADIRU failure that resulted in the aircraft pitching up and climbing 600 feet. The left ADIRU was put in ATT (attitude-only) mode in accordance with the Quick Reference Handbook, but it continued to display erroneous attitude information to the captain. The remainder of the flight was flown manually with an uneventful landing. The UK's AAIB released the final report on 31 October 2019<ref>{{Cite web|url=https://www.gov.uk/aaib-reports/aaib-investigation-to-boeing-737-8as-ei-gjt|title=AAIB investigation to Boeing 737-8AS, EI-GJT|last=|first=|date=|website=|url-status=live|archive-url=|archive-date=|access-date=}}</ref>, with the following recommendation:<blockquote>It is recommended that Boeing Commercial Aircraft amend the Boeing 737 Quick Reference Handbook to include a non-normal checklist for situations when pitch and roll comparator annunciations appear on the attitude display.</blockquote>
==See also==
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