14 CFR 21.616 - Responsibility of holder.
Each holder of a TSO authorization must -
(b) Maintain a quality system in compliance with the data and procedures approved for the TSO authorization;
(c) Ensure that each manufactured article conforms to its approved design, is in a condition for safe operation, and meets the applicable TSO;
(e) Identify any portion of the TSO article (e.g., sub-assemblies, component parts, or replacement articles) that leave the manufacturer's facility as FAA approved with the manufacturer's part number and name, trademark, symbol, or other FAA approved manufacturer's identification;
(f) Have access to design data necessary to determine conformity and airworthiness for each article produced under the TSO authorization. The manufacturer must retain this data until it no longer manufactures the article. At that time, copies of the data must be sent to the FAA;
(h) Make available to the FAA information regarding all delegation of authority to suppliers.