I'm glad to see that people are as knowledgeable on CSA practices as they are on airline manufacturing (read: not really).

In the case of CSA (at least in the industry I know of in safety equipment) 1 of 500 produced must be tested. If it fails, 10 are pulled from inventory and tested. If any of those 10 also fail then a recall must be issued. CSA audits the control practices plus has 2-3 unannounced spot checks.

The noise this tread generates is truly impressive. I suggest (most) people stick to being passengers...and complaining. This place certainly has experts in those fields....