StacksVerified U.S. regulatory reference

14 CFR §21.613

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)A TSO authorization or letter of TSO design approval is effective until surrendered, withdrawn, or otherwise terminated by the FAA.
  2. (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.