[Code of Federal Regulations] [Title 14, Volume 1] [Revised as of January 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR21.51] [Page 125] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 21--CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS--Table of Contents Subpart B--Type Certificates Sec. 21.51 Duration. A type certificate is effective until surrendered, suspended, revoked, or a termination date is otherwise established by the Administrator.