[Info-vax] OT: Aircraft pitot tubes and clustering.

[AEF]

On Dec 18, 11:13 am, koeh... at eisner.nospam.encompasserve.org (Bob
Koehler) wrote:
> In article <00a698de$0$26911$c3e8... at news.astraweb.com>, JF Mezei <jfmezei.spam... at vaxination.ca> writes:
>
>
>
> > Sort of interesrting because I guess when they designed the aircraft,
> > they had not considered cases where 2 failures would happen at same time
> > and with the same amount of error, causing the one remaining valid
> > sensor to be kicked off and the erroneous values to be used since their
> > have "quorum" betwen themselves.
>
>    Generally tripple redundancy is used in cases where human life is
>    being protected.  During design and implementation the possibility
>    of double failures is investigated and the causes are worked on to
>    bring the likelyhood to a very small value.  It is often impossible
>    to eliminiate.
>
>    With tripple redundancy there is always the possibility of system
>    failure due to double faults.

So how often is one computer voted out? How often do these double
faults arise? Please feel free to specify what ensembles (or
categories, if you will, such as one or more of the following: small
planes, jet planes, manned spacecraft, etc.) or just a rough estimate
covering all if such a number is meaningful.

TIA.
[...]

AEF