Which regulation in 14 CFR dictates the required identification markings on U.S. -registered civil aircraft?

The regulation in 14 CFR that dictates the required identification markings on U.S.-registered civil aircraft is indeed found in Part 45. This section details the identification requirements, including the registration numbers that must be displayed prominently on the aircraft, along with other related identification information.

Part 45 specifies the size, color, and location of the markings, ensuring that aircraft can be easily identified for safety and regulatory purposes. This regulation is crucial for maintaining the integrity of the aviation system, as it allows for the tracking and accountability of aircraft within U.S. airspace.

In contrast, other parts deal with different aspects of aviation regulations. For example, Part 43 covers maintenance, preventative maintenance, and alterations, while Part 47 focuses on the registration of aircraft. Part 49 pertains to the recording of aircraft titles and security interests. Each of these parts serves a distinct purpose, but specifically, the identification markings relevant to aircraft registration and visibility are outlined in Part 45.