Don’t aircraft manufacturers audit their suppliers? The parts should not have been accepted without the safety certificates, right?
The accusation is that the unauthorized manufacturer created fake security certificates.
No one should be surprised here. It's just like the CDC and FDA "overseeing" the Jim Jones Jab from Pfizer and ModeRNA.
The parts were sold to jet engine maintenance organizations, not to the manufacturers.
After some number of hours of operation, airliners are sent to repair shops, often in developing countries, for routine teardown and replacement of worn parts.
>>More than 900 aircraft maintenance and repair stations have been certified by the Federal Aviation Administration (FAA) outside of the United States. The number of these facilities has grown by more than 30% in the past four years. These foreign repair stations are located all around the globe including China (78 facilities), Singapore (54), Brazil (22), Thailand (6), Costa Rica (3), and El Salvador (2).
https://www.twu.org/current-issues/foreign-aircraft-maintenance/
“Don’t aircraft manufacturers audit their suppliers?”
Hard to do in China.