I'm sure that for every good idea that made it into a spaceship design, there had to be plenty of bad ideas. There's most likely a bunch of old designs (or practices) that passed previously, but would be scoffed at today by our new standards. I'm mostly interested in the older designs that were used in space exploration that would be immediately declined today due to any number of reasons. Anything that was implemented/used in previous space exploration that would be absolutely banned by standards today would be a fit for an answer to this question.

For instance, lets assume we were in the 1980's attempting a new chemical composition of solid rocket fuel that ended up releasing 2-3 times the amount of acoustic vibrations than was expected.

Answering the following: "Why would we never have let this happen today, and why did we let this happen then?" Would be a great answer. I would like explanation of the incident to be in detail explaining:

Why it failed. What new regulations were put in place because of it. How we would do it now.

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    Generally, we only allow these types of list questions if there is a reasonable limit to the number of examples people might provide. I'm not so sure there is a good limit here. – called2voyage Aug 9 at 20:15
  • If you restricted it to a particular era, it might be ok. – called2voyage Aug 9 at 20:18

One prominent example are the original Apollo hatches which opened towards the inside of the capsule. During a ground training mission, a fire broke out inside the capsule. The pressure increased and the astronauts inside couldn't open the hatches to escape. Had the hatches opened towards the outside, the astronauts might have survived.

The result were three dead astronauts and a redesign of the capsule leading to outwards-opening hatches.

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