[SystemSafety] Miss vs Ms

[Peter Bernard Ladkin]

On 2021-04-13 02:02 , Bruce Hunter wrote:
> 
> The interesting thing was that this was indirectly a result of updated software errors in an update 
> to the off-board load balancing computer on a PC (ALPAC). Great lesson that dangerous software 
> failures may not just occur on integrated systems but on separate ancillary equipment as well. You 
> really need to check whether safety functions are dependent on external 
systems reliability as well 
You sure do.

W&B calculations on commercial aircraft are an example of a critical process in which data and their 
accuracy are key. Not only is the SCSC Data Safety Guidance relevant, but 
so are other routine 
cross-checks well known in computer science.

After an Emirates A340 narrowly avoided becoming a horrendous accident on 
takeoff from Melbourne in 
2009, Bernd Sieker and I wrote a short note explaining how such data safety procedures, input and 
processing, could be improved. (It seems we sent it to HESSD, but I am not sure HESSD was held that 
year.)

A decade on, trivial design/programming errors are apparently still making it into such 
safety-related software.

PBL

Prof. Peter Bernard Ladkin, Bielefeld, Germany
ClaireTheWhiteRabbit RIP
Tel+msg +49 (0)521 880 7319  www.rvs-bi.de





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