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 K—Approval of Materials, Parts, Processes, and Appliances (§21.301 to §21.320) > 21.313—Duration.

21.313—Duration.

Code of Federal Regulations

Effective Date Note: By Docket No. FAA-2006-25877, 74 FR 53390, Oct. 16, 2009, subpart K 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 K—Parts Manufacturer Approvals § 21.313 Duration. A PMA is effective until surrendered, withdrawn, or the FAA otherwise terminates it.