14 C.F.R. § 21.217 Duration.
Title 14 - Aeronautics and Space
Unless sooner surrendered, superseded, revoked, or otherwise terminated, provisional airworthiness certificates are effective for the duration of the corresponding provisional type certificate, amendment to a provisional type certificate, or provisional amendment to the type certificate.
Title 14: Aeronautics and Space
PART 21—CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS
Subpart I—Provisional Airworthiness Certificates
§ 21.217 Duration.
