CFR > Title 14 - Aeronautics and Space > CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER C—AIRCRAFT (parts 21 to 50) > PART 21—CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS > SUBPART O—Technical Standard Order Authorizations (§21.601 to §21.620) > 21.621—Transferability and duration.

21.621—Transferability and duration.

A TSO authorization or letter of TSO design approval issued under this part is not transferable and is effective until surrendered, withdrawn, or otherwise terminated by the Administrator.

Code of Federal Regulations

Effective Date Note: By Amdt. No. 21-92, 74 FR 53392, Oct. 16, 2009, § 21.621 was revised, effective Apr. 14, 2010. The section heading for § 21.621 was subsequently revised, effective Apr. 16, 2011 at 75 FR 9095, Mar. 1, 2010. For the convenience of the user, the revised text is set forth as follows: § 21.621 Issue of letters of TSO design approval: Import articles. Pt. 21, Subpt. O, Nt. Effective Date Note: By Docket No. FAA-2006-25877, 74 FR 53392, Oct. 16, 2009, subpart O of part 21 was revised, effective Apr. 14, 2010. The effective date of this revision was subsequently postponed to Apr. 16, 2011 at 75 FR 9095, Mar. 1, 2010. For the convenience of the user, the revised text is set forth as follows:

Code of Federal Regulations

Effective Date Note: By Docket No. FAA-2006-25877, 74 FR 53392, Oct. 16, 2009, subpart O of part 21 was revised, effective Apr. 14, 2010. The effective date of this revision was subsequently postponed to Apr. 16, 2011 at 75 FR 9095, Mar. 1, 2010. For the convenience of the user, the revised text is set forth as follows: Subpart O—Technical Standard Order Approvals § 21.621 Issuance of letters of TSO design approval: import articles. (a) The FAA may issue a letter of TSO design approval for an article— (1) Designed and manufactured in a foreign country or jurisdiction subject to the export provisions of an agreement with the United States for the acceptance of these articles for import; and (2) For import into the United States if— (i) The State of Design certifies that the article has been examined, tested, and found to meet the applicable TSO or the applicable performance standards of the State of Design and any other performance standards the FAA may prescribe to provide a level of safety equivalent to that provided by the TSO; and (ii) The manufacturer has provided to the FAA one copy of the technical data required in the applicable performance standard through its State of Design. (b) The FAA issues the letter of TSO design approval that lists any deviation granted under § 21.618 .