> There were only 2 possible causes of the incident, either the bolts had been replaced with bolts made from an inappropriate material, so they broke, or the bolts had not been assembled correctly, and they became loose.
Or the ‘correct’ assembly instructions weren’t actually correct, or the design isn’t good enough (e.g. it uses too few bolts, or didn’t check the strength of the bolts when they get cold), or the bolts were of the correct material, but designed too thin, etc.
Or the ‘correct’ assembly instructions weren’t actually correct, or the design isn’t good enough (e.g. it uses too few bolts, or didn’t check the strength of the bolts when they get cold), or the bolts were of the correct material, but designed too thin, etc.