What type of licensee can determine if a transport is unsafe for CNG service?

The correct choice indicates that a Category 1 or 4 licensee has the specific training and expertise necessary to assess the safety of transport for Compressed Natural Gas (CNG) service. These licensees typically possess comprehensive knowledge of CNG systems, regulatory requirements, and the technical standards necessary to evaluate whether a vehicle and its components are suitable for safely transporting CNG.

Category 1 licensees are usually involved in the installation or maintenance of CNG systems, while Category 4 licensees are often focused on the operational aspects, ensuring that conditions meet safety standards. Their understanding of the potential hazards and proper protocols associated with CNG transportation makes them qualified to determine the safety of a transport vehicle for CNG usage.

Technicians that fall under different categories may not have the same level of specialized training regarding CNG safety assessments, while AFS-examiners are specifically trained to conduct certain types of evaluations, they may not always be classified under the same category that has comprehensive authority over both operational safety and transport assessment. Independent safety assessors might provide necessary evaluations, but the direct authority for safety determination specifically tied to CNG transport rests primarily with those designated as Category 1 or 4 licensees.