[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: 14CFR45.23] [Page 870] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 45--IDENTIFICATION AND REGISTRATION MARKING--Table of Contents Subpart C--Nationality and Registration Marks Sec. 45.23 Display of marks; general. (a) Each operator of an aircraft shall display on that aircraft marks consisting of the Roman capital letter ``N'' (denoting United States registration) followed by the registration number of the aircraft. Each suffix letter used in the marks displayed must also be a Roman capital letter. (b) When marks that include only the Roman capital letter ``N'' and the registration number are displayed on limited or restricted category aircraft or experimental or provisionally certificated aircraft, the operator shall also display on that aircraft near each entrance to the cabin or cockpit, in letters not less than 2 inches nor more than 6 inches in height, the words ``limited,'' ``restricted,'' ``experimental,'' or ``provisional airworthiness,'' as the case may be. [Doc. No. 8093, Amdt. 45-5, 33 FR 450, Jan. 12, 1968, as amended by Amdt. 45-9, 42 FR 41102, Aug. 15, 1977]