Air data inertial reference unit: Difference between revisions

Revision as of 10:27, 25 August 2008

Revision as of 04:37, 15 October 2008

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===Air Data Reference===

The pitot and static pressures are measured by small Air Data Modules (ADM) located as close as possible to the respective pressure sources (pitot and static probes). The ADMs transmit their pressures to the ADIRUs through ARINC 429 data buses.<ref name="art3">{{Cite web|url=http://www.boeing.com/commercial/aeromagazine/aero_08/erroneous_textonly.html|title=Erroneous Flight Instruments|accessdate=2008-07-14|publisher=Boeing Aero Magazine, Issue 08}}</ref>

==Failures==

*[[1 August]] [[2005]] - [[Malaysia Airlines]] Flight 124, a [[Boeing 777]]-2H6ER departed [[Perth, Western Australia]] for [[Kuala Lumpur]]. Climbing through 38,000 feet a faulty accelerometer caused the aircraft's [[Air Data Inertial Reference Unit]] (ADIRU) to command changes of altitude. The flight crew overrode the ADIRU and manually returned to land the aircraft at Perth. The subsequent [[ATSB]] investigation led the US [[FAA]] to issue emergency airworthiness directive 2005-18-51 on the fly-by-wire software. <ref>[http://aviation-safety.net/database/record.php?id=20050801-1 Incident 20050801-1] Aviation Safety Network, accessed 14 October 2008</ref>

== References ==