What kind of practices besides visible inspection were in place?
Someone correct me but I think that's how most of the inspections take place, carnival or Disney.
They're not going out to the track with a complicated set of scientific instruments and chemicals to figure out if something has a problem, they're generally walking the track or inspecting the ride for any signs of visible fractures.
At the park I worked at, way back in the day, there were daily inspections (generally visible and by the ride operators (teenagers)) and if anything was noticed then they'd call maintenance. At the same time maintenance had a ride-rotation deal of refurbishing each ride every so many years.
I think that there is the notion that because it's Disney there's some kind of high-caliber testing happening and I think that's a false notion.
I think visible inspection is reasonable. I'm not saying it's bad. I'm just disputing the notion that you have scientists going out and performing metal fatigue tests on all components of a ride. That just doesn't happen.
I think it mostly boils down to:
- visible checks
- bad sensors (replacement)
- resetting rides after a malfunction (like the ride stopped because of a bad sensor, not part of the ride fell off and they decided to just go ahead and restart it - though something like that did happen at Alton Towers a few years back (components didn't fall off but the maintenance guy just reset it without checking causing several deaths, I believe)).
Also - not knocking you or anyone else for thinking Disney has more in place than it does. I think it's just a common misconception. Again, if someone knows for sure that Disney really is doing lab-coat tests, certainly correct me. I just don't think that's the reality or is really even warranted.
Keep in mind, too, that sometimes bad things happen. Yeah, maybe that other thing could have gotten checked but didn't for some reason but you're going to have ride failures in the future. It's industrial equipment and it's going to happen. You can reduce your risks somewhat but never eliminate them.