§ 21.613. Duration.
78 words·~1 min read·
/us/cfr/t14/s§ 21.613·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)A TSO authorization or letter of TSO design approval is effective until surrendered, withdrawn, or otherwise terminated by the FAA.
(b)If a TSO is revised or canceled, the holder of an affected FAA letter of acceptance of a statement of conformance, TSO authorization, or letter of TSO design approval may continue to manufacture articles that meet the original TSO without obtaining a new acceptance, authorization, or approval but must comply with the requirements of this chapter.