Archives For system architecture

The BEA has released a precis of the data contained on AF447’s Flight Data Recorder and we can know look into the cockpit of AF447 in those last terrifying minutes.

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Over the last couple of months I’ve posted on various incidents involving the Airbus A330 aircraft from the perspective of system safety. As these posts are scattered through my blog I thought I’d pull them together, the earliest post is at the bottom.

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Ariane 501 Launch

I was cleaning up some of my reference material and came across a copy of the ESA board of investigation report into the Ariane 501 accident. I’ve added my own personal observations, as well as those of other commentators, to the report. Continue Reading…

A cross walk of the interim investigation accident reports issued by the ATSB and BEA for the QF72 and AF447 accidents respectively shows that in both accidents the inertial reference units that are part of the onboard air data inertial reference unit (ADIRU) that exhibited anomalous behaviour also declared a failure. Why did this occur?

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TCAS Indicator (Image Source: Public Domain)

What TCAS can tell us about AF447 (Updated 27 Sept 09)

The BEA interim report on the AF447 accident confirms that the Traffic Alert and Collision Avoidance System (TCAS) had become inoperative during the early part of the event sequence for an, as yet, un-identified reason. The explanation may actually be fairly straight forward and lie within the fault tolerance requirements of the TCAS specification. Continue Reading…