Hazardous Materials: Show Cause and Procedures for Complying With the UN Model Regulation 6(d) Test Criteria for Certain Explosive Classification Approvals

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Transportation Pipeline and Hazardous Materials Safety Administration [Docket No. PHMSA-2017-0108, Notice No. 2021-03] AGENCY: Pipeline and Hazardous Materials Safety Administration (PHMSA), DOT. ACTION: Notice. SUMMARY: PHMSA is issuing this notice to serve process in accordance with 49 CFR 105.35(a)(3) and inform all persons who currently hold Explosive (EX) approvals for four specific Division 1.4S explosives of the process necessary for maintaining or upgrading these approvals. FOR FURTHER INFORMATION CONTACT: Ms. Harpreet Singh, Chief, Energetic Materials Branch, Sciences and Engineering Division, Office of Hazardous Materials Safety, (202) 366-4535, PHMSA, 1200 New Jersey Ave. SE, Washington, DC 20590. SUPPLEMENTARY INFORMATION: A. Background The 20th Revised Edition (2017)  [ 1 ] of the United Nations Recommendations on the Transport of Dangerous Goods—Model Regulations (UN Model Regulations) was amended so that four Division 1.4S explosives ( i.e., UN0349, UN0367, UN0384, and UN0481) must now pass an additional test ( i.e., the UN 6(d) unconfined package test) to continue to maintain the 1.4S classification. This requirement was also implemented for international air transport in the International Civil Aviation Organization (ICAO) Technical Instructions for the Safe Transport of Dangerous Goods by Air on January 1, 2019, and for international vessel transport in the International Maritime Dangerous Goods (IMDG) Code on January 1, 2020. On M…