Identification and Registration Marking
a. This advisory circular (AC) provides information about Title 14, Code of Federal Regulations (14 CFR), part 45, Identification and Registration Marking. This AC is not mandatory and does not constitute a regulation. This AC describes an acceptable means, but not the only means, to comply with the requirements for identifying aircraft, aircraft engines, or propellers with identification plates, and marking aircraft with nationality and registration marks. However, if you use the means described in the AC, you must follow it in all important respects.
b. A list of other related sections of 14 CFR and related publications, and definitions pertinent to this AC are located in the appendixes to this AC.
Identification, marking, and placarding of aircraft issued special airworthiness certificates in the light-sport category (S-LSA) and aircraft issued experimental certificates for the purpose of operating light-sport aircraft (E-LSA)
This AC describes an acceptable means, but not the only means, to comply with the requirements for identifying S-LSA and E-LSA with identification (ID) plates, displaying nationality and registration marks, and displaying placards. This AC also provides marking guidance for instruments necessary for the safety of flight.