Why? I don't recall this happening on any of the other roller coasters which passed that anniversary... planes famously run with the stuff they're built with leading to all those 'BA 747s still running Windows 3.1' style stories.
Replacement parts…normally not supported by the manufacturer. Some parts, relays etc may be approaching end of life. All electrical parts have and end of life.
Might be fine running, try turning it off and back on…
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I've certainly operated a number of coasters older then Spinball running their original PLCs.
What is it about age that makes them less reliable ? We have infrastructure / technology at work that is older than me that we don't change in fear of breaking it, it just keeps going otherwise.
Replacement parts no longer manufactured
Support from known suppliers/integrators for updates
All electrical kit has a lifespan (based on calculations of number of cycles) eventually it will hit that limit
Standards have changed, related to safety, design or cyber security
No documentation/drawings
There’s a myriad of reasons
That’s precisely my point, not changing for fear of breaking it is unsustainable, when it’s got people’s safety under its control…
And do you think Alton fancies taking the risk?
It can often mean the end of a rides life (see corkscrew, black hole etc) sometimes though it’s worth upgrading (see Nemesis which I’m sure has had a control system replacement at this point, be mad not too) but it’s not that major as they aren’t overly complicated and not time/process restricted and it’s a highly regulated industry. I’d expect something between £200k to £1m