John Barnett is a former quality control engineer who has worked for the company for 32 years, including in the South Carolina plant where the 787 Dreamliner is manufactured.
“Boeing South Carolina is strictly driven by schedule and cost,” Barnett claims, suggesting that up to a quarter of the oxygen systems could be faulty but were deliberately fitted to planes to save on costs.
https://www.neweurope.eu/article/boeing-faced-with-additional-profit-over-safety-allegations/