The Pinto *was* less safe in rear crashes than many other cars of the era. While it shared one particular flaw (placement of the gas tank relative to the rear-axel differential) which made burst tanks more common than with vehicles where the tank was *above* the differential, it *also* had a flaw which would cause the tank to disconnect from the fill hose, making post-accident *spills* more common, even when the tank itself retained structural integrity.
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This doesn't appear to be a QC issue at all, rather it appears to be a design flaw which escaped QA.
QC has to do with manufacturing variance during production.
QA has to do with ensuring the design is suitable for production in the first place.
Ah, you're right. The Quality Analysis team at the design phase would be the group responsible. That's what I was thinking, but used the wrong term.