Which regulation governs hazardous material transport in aviation?

The regulation that governs hazardous material transport in aviation is 49 CFR Part 175. This part is specifically designated to address the transportation of hazardous materials by aircraft. It outlines requirements for the packaging, labeling, and documentation of hazardous materials to ensure safe transport and compliance with federal regulations. This regulation applies to all aspects of air transport of hazardous materials, including the responsibilities of shippers, carriers, and operators involved in the transportation process.

In contrast, other regulations listed do not pertain to hazardous material transport specifically. For instance, 49 CFR Part 150 deals with the Federal Aviation Administration's authority over aviation, which does not focus on hazardous materials. 14 CFR Part 121 is concerned with the operating requirements for domestic, flag, and supplemental operations of US air carriers, while 14 CFR Part 139 pertains to certification of airports serving scheduled air carriers and not to the regulation of hazardous materials during transport. Understanding the specific focus of 49 CFR Part 175 helps clarify the critical measures in place to manage the risks associated with transporting hazardous materials by air.