If I build something, and I buy something from a third party to be part of it, I make sure that
A) it isn’t defective B) it integrates robustly
You can wave your hand at the supply chain all you want, but if you’re sticking your name on it, it’s yours.
This is not about building the engine doors, it's about who did not close them properly during last maintenance.
Is it about the manufacturer because they made a bad design that broke after some years, or me doing properly maintenance?
Certainly not downplaying Boeing’s massive screwups but it just seems that every single incident that everyone just used ignore in past is now an international news story (but only if a Boeing plane is involved)
Definitely not true for airplane engines.