Constant Spec, constant QC; PRC subscribes to the same UN (ICAO) Technical-matters conventions as the rest of us do. TWA flew 5 MD83 from 1994, assembled in Shanghai. Licence-assembly programs now have a gradual move to local fabrication from local basic metals: that gives eye-watering potential cost reductions. As LT says, Buyer must deal with (the "paper trail", as was) record-keeping: gaps here have caused premature parting-out of Chinese-operated Western equipment. If Ford could build fine Merlins in 1941, their site a target for the Luftwaffe, best assume PRC will continue to deliver, on-Spec, on-time anything they choose.