[in reply to a questions about Chinese accident investigation quality]
Originally Posted by
FlightDetent
[...]
But no doubt the reason will be found out and corrective actions taken.
[...]
I agree. Also keep in mind that under ICAO rules they are required to allow representatives from the country of aircraft design (USA) and aircraft manufacturer (also USA) to participate in the investigation:
5.18 The State of Registry, the State of the Operator, the State of Design and the State of Manufacture shall each be entitled to appoint an accredited representative to participate in the investigation.
They won't have a say in the report, but will be allowed to observe, and can write their own additional, if unofficial, reports.
Traditionally, the engine design and manufacturing companies also request and receive permission to send representatives, but there is no such obligation under ICAO Annex 13.