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Technical standards would be vastly improved by adding a because-clause to all of the do-this and don't-do-that requirements.

Section 9.5: "NOTE: Do not use spiral wrap sleeving on mission hardware including launch vehicles."

If you knew why, then you could make intelligent decisions for cases to specifically covered by the standard. Possible reasons: Poor strength to weight ratio, unreliable under high-g load, makes visual inspection difficult, there is a better but more expensive substitute, etc.



From a point of view of a person not employed at NASA manufacturing plant who would like to learn something from that document, I agree. But my guess is that this standard is created for people who are paid to obey, not to think, because there are decisions made higher up the chain that depend on the components being deterministic.

This reminds me of an anecdote I saw on HN once, about Apple hardware team sending boards back to Chinese manufacturers who replaced a capacitor (or some other part) with a cheaper one without realizing it was vital for the product to work for reasons they were not aware of.




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