Yes/no. The design spec is something like “95% probability of completing 5 flights” - that is, the minimum threshold to be successful. That leaves a lot of ex

Yes/no. The design spec is something like “95% probability of completing 5 flights” - that is, the minimum threshold to be successful. That leaves a lot of extra margin to keep going well past it - 90% for 10 flights; 80% for 20; etc. (made up numbers) You also get the “bathtub curve” in most mechanical systems. Once you get past the early design defect failures, things tend to last a long time, until they start wearing out.