Air data inertial reference unit: Difference between revisions

Revision as of 10:14, 28 April 2025

Latest revision as of 19:02, 21 July 2025

(2 intermediate revisions by 2 users not shown)

Line 1:

{{Short description|Flight instrument}}

An '''air data inertial reference unit''' (ADIRU) is a key component of the integrated '''air data inertial reference system''' (ADIRS), which supplies air data ([[airspeed]], [[angle of attack]] and [[altitude]]) and [[Inertial navigation system|inertial reference]] (position and altitudeattitude) 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

Line 70:

===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

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

Line 222:

===Ryanair Flight 6606===

[[File:Boeing 737-800 ‘EI-GJT’ Ryanair (53760657763).jpg|Boeing_737-800_‘EI-GJT’_Ryanair_(53760657763)|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>