[Code of Federal Regulations] [Title 14, Volume 2] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR63.21] [Page 425] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 63_CERTIFICATION: FLIGHT CREWMEMBERS OTHER THAN PILOTS--Table of Contents Subpart A_General Sec. 63.21 Change of address. Within 30 days after any change in his permanent mailing address, the holder of a certificate issued under this part shall notify the Department of Transportation, Federal Aviation Administration, Airman Certification Branch, Post Office Box 25082, Oklahoma City, OK 73125, in writing, of his new address. [Doc. No. 10536, 35 FR 14075, Sept. 4, 1970]