Earlier quoted context omitted.
Do you know if the parts the flew away, are build by the engine manufacturer, are build by the engine manufacturer and attached/assembled by Boeing or are those coverings build and attached by Boeing (because every attachment for every plane is different, even for the same engine?)
It isn’t relevant - the final assembler is responsible for QC. 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.
Definitely not true for airplane engines.