[SystemSafety] A small taste of what we're up against

[paul_e.bennett at topmail.co.uk]

On 24/10/2018 at 12:12 PM, "Derek M Jones" <derek at knosof.co.uk> wrote:
>
>Thierry,

[%X]

>Most systems are short lived.  It is survivorship biases that makes
>people think systems are long lived.
>
>But my data is commercial data processing.  Does anybody have any
>lifetime data for safety critical systems (don't forget the 
>software goes away if the product is not a success).

One datapoint (or maybe two because the two machines concerned utilise
the same design although exist in separate localities) have operated since
1985 and are expected to continue until 2030. This is on the software as it
was initially installed. Then, the machines operate in a highly regulated
establishment. I have not heard of anything other than normal mechanical
maintenance to the equipment being done.

Regards

Paul E. Bennett IEng MIET
Systems Engineer
Lunar Mission One Ambassador
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