What is the main purpose of FAA regulations regarding propane containers?

The main purpose of FAA regulations regarding propane containers is to set standards for liquefied gases in aviation. These regulations are crucial because propane, among other liquefied gases, can pose unique risks when transported via air due to factors like pressure changes at altitude, the potential for leaks, and the need for specific containment standards to ensure safety. Establishing clear guidelines helps to prevent accidents and ensures that propane is handled, stored, and transported in a manner that minimizes risks to aircraft, passengers, and crew members.

The other options, while relevant to safety and transport, do not specifically address the unique requirements and safety considerations that pertain to the aviation sector. FAA regulations specifically target the aviation industry rather than commercial vehicle transport (which falls under a different set of regulations), recreational use, or mobility aspects for consumer propane tanks. The focus is on preventing incidents during air transport, thus affirming the necessity of these regulations in ensuring a safe aviation environment.