EddyCurr, in passing on link to the TSB report, included a few excerpts. But I think these are also noteworthy:
1.17.4.1 Oversight of Fore Machine Company: ...Without parts manufacturing authority, FMC could not certify the parts it was manufacturing as airworthy; therefore, Bell would inspect and certify the products FMC produced, and issue the appropriate airworthiness documentation when it later sold those parts to customers.
but earlier in the report:1.17.2.3 Process for first article inspection: Bell has a first article inspection validation process in place to assess the manufacturing production process and to assess the final product the first time a vendor produces a new part for Bell. ...In this case, the first article inspection validation was carried out at the vendor’s facility (FMC). The third party service provider inspector logs in to Bell’s IT systems to complete and document the inspection process just as an inspector who worked directly for Bell would do.