21.431—Applicability.
(a)
This subpart prescribes Designated Alteration Station (DAS) authorization procedures for—
(1)
Issuing supplemental type certificates;
(2)
Issuing experimental certificates; and
(3)
Amending standard airworthiness certificates.
(b)
This subpart applies to domestic repair stations, air carriers, commercial operators of large aircraft, and manufacturers of products.
Code of Federal Regulations
[Amdt. 21-6, 30 FR 11379, Sept. 8, 1965; 30 FR 11849, Sept. 16, 1965, as amended by Amdt. 21-74, 62 FR 13253, Mar. 19, 1997]