Which federal regulation outlines the size and location requirements for aircraft identification numbers?

The regulation that outlines the size and location requirements for aircraft identification numbers is FAR Part 45. This section specifically addresses the marking requirements for aircraft, including the need for the aircraft to display an identification number that is clear and visible. The identification number must be located on the fuselage or another easily recognizable area of the aircraft, and it must meet specific size and format standards to ensure legibility. This regulation is crucial as it helps establish ownership and aids in the identification of aircraft during operations and maintenance.

Understanding this part of the Federal Aviation Regulations (FAR) is important for compliance with safety and identification practices in aviation. It ensures that identification numbers are consistently formatted, which aids in tracking and registering aircraft for various regulatory purposes.