PBL:
Just a point of clarification to your posting. The investigation is the responsiblity of the Brazilian authorities. The NTSB is an interested party, and they are providing a service to the Brazilian authorities by downloading and interpreting the CVR / FDR. The NTSB are not the investigating authority, and as such, they cannot issue interim recommendations unless they have permission from the investigating authority, similar to how Airbus had permission from Brazil to issue their AIT earlier this week.