Air data inertial reference unit: Difference between revisions

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{{Short description|Flight instrument}}

An '''Airair Datadata Inertialinertial Referencereference Unitunit''' (ADIRU) is a key component of the integrated '''Airair Datadata Inertialinertial Referencereference Systemsystem''' (ADIRS), which supplies air data ([[airspeed]], [[angle of attack]] and [[altitude]]) and [[Inertial navigation system|inertial reference]] (position and attitude) information to the pilots' [[electronic flight instrument system]] displays as well as other systems on the aircraft such as the engines, [[autopilot]], [[aircraft flight control system]] and landing gear systems.<ref name="art5">

{{Cite web

|url=http://findarticles.com/p/articles/mi_m0UBT/is_32_20/ai_n26957235

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|access-date=2008-07-14

|publisher=Boeing Aero Magazine, Issue 08

| archive-url= https://web.archive.org/web/20080612001822/http://www.boeing.com/commercial/aeromagazine/aero_08/erroneous_textonly.html| archive-date= 12 June 2008 <!--DASHBot-->| url-status= live}}</ref> Ram air pressure and static pressures used in calculating [[airspeed]] are measured by small ADMs located as close as possible to the respective [[Pitot tube|pitot]] and static pressure sensors. ADMs transmit their pressures to the ADIRUs through [[ARINC 429]] data buses.<ref>{{cite web |url=http://www51.honeywell.com/aero/common/documents/Air_Data_Module.pdf |publisher=Honeywell |title=Air Data Module |access-date=25 December 2016 |archive-date=3 March 2016 |archive-url=https://web.archive.org/web/20160303170855/http://www51.honeywell.com/aero/common/documents/Air_Data_Module.pdf |url-status=dead }}</ref>

===Inertial reference===

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===FAA Airworthiness directive 2000-07-27===

On May 3, 2000, the FAA issued [[airworthiness directive]] 2000-07-27, addressing dual critical failures during flight, attributed to power supply issues affecting early [[Honeywell]] HG2030 and HG2050 ADIRU [[ring laser gyro]]s used on several Boeing 737, 757, Airbus A319, A320, A321, A330, and A340 models.<ref name="art2" /><ref>{{cite web

|url=http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/WebSearchDefault?SearchView&Query=AD%202000-07-27&SearchOrder=1&SearchMax=0&SearchWV=TRUE&SearchFuzzy=FALSE&Start=1&Count=100#

{{cite web

|url=http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/WebSearchDefault?SearchView&Query=AD%202000-07-27&SearchOrder=1&SearchMax=0&SearchWV=TRUE&SearchFuzzy=FALSE&Start=1&Count=100#

|title=Various transport category airplanes equipped with certain Honeywell Air Data Inertial Reference Units

|publisher=US [[Federal Aviation Administration]]

|date=April 18, 2000

|access-date=2008-10-15

|archive-date=2009-06-06

}}</ref><ref>

|archive-url=https://web.archive.org/web/20090606142545/http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/WebSearchDefault?SearchView&Query=AD%202003202000-2607-0327&SearchOrder=1&SearchMax=0&SearchWV=TRUE&SearchFuzzy=FALSE&Start=1&Count=100#

|url-status=dead

}}</ref><ref>

{{cite web

|url = http://www.casa.gov.au/airworth/airwd/ADfiles/equip/inst/INST-045.pdf

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===Airworthiness directive 2003-26-03===

On 27 January 2004 the FAA issued airworthiness directive 2003-26-03 (later superseded by AD 2008-17-12) which called for modification to the mounting of ADIRU3 in Airbus A320 family aircraft to prevent failure and loss of critical attitude and airspeed data.<ref name="art2" /><ref>{{cite web

|url=http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/WebSearchDefault?SearchView&Query=AD%202003-26-03&SearchOrder=1&SearchMax=0&SearchWV=TRUE&SearchFuzzy=FALSE&Start=1&Count=100

{{cite web

|url=http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/WebSearchDefault?SearchView&Query=AD%202003-26-03&SearchOrder=1&SearchMax=0&SearchWV=TRUE&SearchFuzzy=FALSE&Start=1&Count=100#

|title=Airbus model A318, A319, A320, and A321 series airplanes equipped with certain Northrop Grumman (formerly Litton) Air Data Inertial Reference Units

|publisher=US [[Federal Aviation Administration]]

|date=August 6, 2008

|access-date=2008-10-15

|archive-date=2009-06-06

}}</ref>

|archive-url=https://web.archive.org/web/20090606142550/http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/WebSearchDefault?SearchView&Query=AD%202003-26-03&SearchOrder=1&SearchMax=0&SearchWV=TRUE&SearchFuzzy=FALSE&Start=1&Count=100

|url-status=dead

}}</ref>

===Alitalia A320===

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| url-status = dead

}}</ref>

The ATSB has yet to confirm if this event is related to the other Airbus A330 ADIRU occurrences.<ref name="ATSB_InterimReport" />

===Airworthiness directive 2008-17-12===

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|url-status=dead

}}</ref>

The ATSB has yet to confirm if this event is related to the other Airbus A330 ADIRU occurrences.<ref name="ATSB_InterimReport" />

===[[Qantas Flight 72]]===

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|date=14 October 2008

|access-date=2008-10-15

| archive-url= https://web.archive.org/web/20081016061452/http://www.abc.net.au/news/stories/2008/10/14/2391134.htm| archive-date= 16 October 2008 <!--DASHBot-->| url-status= livedead}}</ref><ref>{{cite news

|url = http://www.theaustralian.news.com.au/business/story/0,28124,24506830-36418,00.html

|title = US tests on false data sent on Qantas jet over WA

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===Qantas Flight 71===

[[File:VH-QPG A330-303 Qantas SIN 02APR06 (5915938802).jpg|thumb|250x250px|VH-QPG, the aircraft involved as flight 71]]

On 27 December 2008, Qantas Flight 71 from Perth to Singapore, a different Qantas A330-300 with registration VH-QPG<ref>{{cite web |url=http://asasi.org/papers/2009/QF72%20Learmonth%20A330%20Pitch%20Events%20Presented%20by%20Mike%20Walker.pdf |title=Learmonth A330 pitch events |author =Mike Walker |access-date=2014-12-17 |archive-date=2014-12-17 |archive-url=https://web.archive.org/web/20141217192357/http://asasi.org/papers/2009/QF72%20Learmonth%20A330%20Pitch%20Events%20Presented%20by%20Mike%20Walker.pdf |url-status=dead }}</ref> was involved in an incident at 36,000 feet approximately {{convert|260|nmi|km}} north-west of Perth and {{convert|350|nmi|km}} south of [[RAAF Learmonth|Learmonth Airport]] at 1729 WST. The autopilot disconnected and the crew received an alert indicating a problem with ADIRU Number 1.<ref>{{cite press release

| title = Qantas Airbus A330 incident, 480km North West of Perth on 27 December 2008

| publisher = Australian Transport Safety Bureau

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|date=28 June 2009

|publisher=aviationnewsrelease

}}</ref> On a 21 May 2009 [[Miami]]-–[[SaoSão 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=https://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 |access-date=14 October 2011}}</ref><ref>{{cite web |title=Brief of Incident |url=https://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= https://www.ntsb.gov/_layouts/ntsb.aviation/GeneratePDF.aspx?id=DCA09IA064&rpt=fi |publisher=NTSB |date=27 June 2011 }}</ref>

===Ryanair Flight 6606===

[[File:Boeing 737-800 ‘EI-GJT’ Ryanair (53760657763).jpg|thumb|EI-GJT, the aircraft involved as flight 6606.]]

On 9 October 2018, the [[Boeing 737 Next Generation|Boeing 737-800]] with registration EI-GJT, 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}}</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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|access-date=2008-10-16

| archive-url= https://web.archive.org/web/20080906001423/http://www.boeing.com/commercial/aeromagazine/aero_08/erroneous_textonly.html| archive-date= 6 September 2008 <!--DASHBot-->| url-status= live}}

* {{cite web|url=httphttps://wwwpatents.google.com/patents?id=Aw8PAAAAEBAJ&dq=6654685patent/US6654685|title=US Patent 6654685 - Apparatus and method for navigation of an aircraft|date=2003-11-25|access-date=2008-10-16|publisher=[[United States Patent Office]]|author =Melville Duncan W. McIntyre, [[Boeing]]}}

{{Flight instruments}}

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[[Category:Navigational equipment]]

[[Category:Technology systems]]

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