jwscud
regardless of who makes the inlet, cowlings or reverser to be used on an aircraft, the certificate holder for the aircraft must show that it meets the specified regulations.
Also, in spite of the regulations covering it's manufacture and installation, the installer must ensure that any unsafe conditions that pop up in-service must be addressed under Continued Airworthiness.
In the most recent event you can expect the NTSB to revisit any loose ends in this regard and to direct the regulator to address them with the parties. If it's cut and dry (obvious) it will be covered in only the final report. If it turns out to be complex (who's in charge) there may be a public hearing with testimony from the parties.