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 and aircraft engines with identification plates, identification marking requirements for propellers, 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.

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.

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.