Counterfeit parts was just a hypothetical example, but in that case I would probably start by filing form F145-5, Un-airworthy condition report, with the CAAC. www.caac.gov.cn If I was afraid of reprisals, I would do it anonymously. If that didn't work I would contact the airframe or engine manufacturer. But the point is that I would do SOMETHING.
It's like this guy said:
"I flew thousands of flights in the last forty-two years, but my entire career is now being judged by how I performed on one of them. This has been a reminder to me: We need to do the right thing every time, to perform at our best, because we never know which moment in our lives we'll be judged on." Sullenberger, Chesley B. Highest Duty, HarperCollins, 2009, p.313
