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In the current situation, sending your own engineers to the manufacturer is the best way to ensure an independent check of the whole production chain. Much easier than having your mechanics take the airplane apart after delivery.

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The problem is that there are many of these planes that have already been delivered. They're going to have to find some way of ensuring QA for those before they're allowed in the air again.

Right. They have to be taken apart. All doors have to be checked systematically and also they need to do random probes to sample for possible other systematic manufacturing defects.

Probably talking to their mechanics, they might quickly identify other problematic components which might have been noticed during maintenance but not strongly enough reported and tracked. Basically everything that needed repairs which shouldn't have been needed.

This is pretty standard for people manufacturing in China. I guess someone assumed because it was "Made in USA" meant the due diligence wasn't necessary?

In decades past, you could actually trust Boeing's QA processes. I think there may be a lot of people who haven't got the memo that Boeing is a different company now.

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