[SystemSafety] COTS display certification

[jean-louis Boulanger]

2016-07-26 10:16 GMT+02:00 SPRIGGS, John J <John.SPRIGGS at nats.co.uk>:

> Hi Haim,
> I am surprised that it is necessary for the operator to be 100% sure that
> the symbol is exactly on the correct spot on the display.  In most
> applications there is an 'annulus of concern' around the 'true' position;
> if the displayed plot is in the hole in the middle, the error is not enough
> to matter and, if it is outside the ring, the error is so large that the
> operator will notice.  It is only on the annulus itself that the position
> error is large enough to matter, but small enough to be credible to an
> operator.
>

In new OCC system, some vital information are displayed on control screen
and this informations is SIL x or DAL x.
In railway, more and more some informations displayed on the screen are
used to take some decision ... if no physical protection exist in the
field, the only information is on the screen.

an example is the High Wind Detection for high speed train, in some place
in case of high wind you need to reduce the speed and the information is
display to the screen ....

It exist some case where the displayed information is SIL4 ....



> Also, in some applications, e.g. where the operator has to maintain
> separation between things, it is relative accuracy that matters, not
> absolute.
> As for field data, have you consulted industrial process control
> companies, e.g. a power station?  What displays do they use?  Do they
> collect data from the operation using a robust process, so that failure
> rates can be confidently predicted for the displays (in that environment)?
>
> John
> *http://www.linkedin.com/in/johnspriggs*
> <http://www.linkedin.com/in/johnspriggs>
> -----Original Message-----
> From: systemsafety [
> mailto:systemsafety-bounces at lists.techfak.uni-bielefeld.de
> <systemsafety-bounces at lists.techfak.uni-bielefeld.de>] On Behalf Of Haim
> Kuper
> Sent: 25 July 2016 17:05
> To: systemsafety at lists.techfak.uni-bielefeld.de
> Subject: [SystemSafety] COTS display certification
>
> Dear System Safety List Members,
>
> We need to develop and certify a Ground Control Station (GCS) that
> controls an avionic platform.
> The GCS contains an In-house-developed Control Computer (CC) and a COTS
> Display.
> Hazard's analyses of the GCS showed that we need to develop and certify to
> DAL-B.
> Regarding the display:
> 1 - It's usually a problem to verify World-coordinates to
> Display-coordinates conversion results-on-screen so that the operator will
> be 100% sure that the symbol is exactly on the correct spot (on the world
> map/screen).
> 2 - I've asked some famous companies (Acer, Samsung, HP, LG) for any
> supporting data, such as service history (as shown in DO-178C section
> 12.3.4 "Product Service History" )  of failure data, any measured or
> designed-to reliability figures: IMHO, I'll not get any assistance from
> them.
> 3 - We are checking some safety design mechanisms such as
>     a. monitoring using another display
>     b. develop some hardware/software/humanware based Built In Tests, and
>     c. still looking for a creative idea to tackle this subject
>
> Per your experience, please advise how to certify the COTS display within
> the GCS development.
>
> Thanks and Regards,
> Haim kuper
>
>
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-- 
Mr Jean-louis Boulanger
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