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The part about the crappy QA process explains why the delivered planes keep having problems.
Not to me. Absence of QA allows faulty parts to make it into a plane, it does not explain why there are faults in the first place. For doors and wheels popping off there have to be either lethal part design mistakes, parts made from play doh instead of aluminium/steel, or the people on the assembly line throwing fasteners in the bin instead of putting them on. It's not like a door pops of because its seal touched soap once and somebody poked an unverified piece of plastic at it. Especially in aviation, where you need to have redundancies.
I think it's an issue of tolerance. They should be using gauges to test the fit, because hotel keycards can vary in thickness. Gauges are stupid cheap compared to the cost of the plane. It's evidence of cost-cutting bullshit.
Same with using dish soap as a lubricant. It's the wrong material for the job. Soap leaves a residue, and dissolves other lubricants. If there's supposed to be lubricant in the door, the soap is a bad choice. If there isn't supposed to be a lubricant in the door, then soap is a bad choice. It's like Schrodinger's lubricant. You won't know if it's a problem until it's a problem.
No manufacturing process or material design is perfect. You get as close as possible, and then QA catches the mistakes.
For Boeing, it sounds like they didn't try very hard to perfect their processes, and then didn't bother with QA.
The soap wasn't used as a leak indicator, it was used as a lubricant to put the rubber door seals onto the metal airframe. Distilled water with a tiny amount of surfactant is a very common fitting lubricant as it leaves very little residue once dried.
The card was a feeler gauge. Not knowing if it's the appropriate thickness is exactly what makes it inherently bad.
They could get both of these things from approved manufactures made to the standards and specs required for aircraft manufacturing. But it was cheaper to buy dish soap and hotel cards.
Boeing CEO, David Calhoun, has a salary of over $6m and takes home $22m with bonuses.