14 C.F.R. § 21.443 Duration.
Title 14 - Aeronautics and Space
(a) A DAS authorization is effective until it is surrendered or the Administrator suspends, revokes, or otherwise terminates it. (b) The DAS shall return the authorization certificate to the Administrator when it is no longer effective.
Title 14: Aeronautics and Space
PART 21—CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS
Subpart M—Designated Alteration Station Authorization Procedures
§ 21.443 Duration.
