[SystemSafety] [External] Re: Miss vs Ms

[Grazebrook, Alvery]

Just by coincidence, noticed this in the news today:

https://simpleflying.com/alitalia-a320-tail-strike-passenger-imbalance/


Cheers,

Alvery


On Tue, 13 Apr 2021 at 14:21, Driscoll, Kevin <kevin.driscoll at honeywell.com>
wrote:

> > W&B calculations on commercial aircraft are an example of a critical
> process
>
> I wonder how well that is internalized and not just “known” by the people
> that create, maintain, and use the W&B calculation tools and processes.
> (“Someone once told me that W&B calculations are critical to safe
> flight.”)  I can see that easily being lost when all W&B calculations are
> done in backroom computers at an airline’s operation center, along with a
> lot of other non-critical airline data processing.  I once saw all NWA
> planes in the take-off que at SEA get pulled to the side (~90% of the dozen
> of planes in the que) because their W&B computer (in TN?) went down.
>
>
>
> *From:* systemsafety <systemsafety-bounces at lists.techfak.uni-bielefeld.de>
> *On Behalf Of *Nick Tudor
> *Sent:* Tuesday, April 13, 2021 3:54 AM
> *To:* Peter Bernard Ladkin <ladkin at causalis.com>
> *Cc:* systemsafety at lists.techfak.uni-bielefeld.de
> *Subject:* [External] Re: [SystemSafety] Miss vs Ms
>
>
>
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> Memory is a little fuzzy and no doubt others may have better. There was an
> unauthorised use of a spreadsheet to do v1/v2 calculations for an E3 AWACS
> aircraft some many years ago   I believe that there was an issue with the
> V1 speed as rotation at too low a speed meant that V2 couldn’t be reached.
> It ran out of runway.
>
>
>
> On Tue, 13 Apr 2021 at 08:11, Peter Bernard Ladkin <ladkin at causalis.com>
> wrote:
>
>
>
> 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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