# AP Training, Inc. — Hazardous Materials Safety Interpretation **Citation:** 09-0147 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 2009-08-20 09-0147 response to AP Training, Inc. concerning 172.101, 172.202. ## Document text <<>> U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration 1200 New Jersey Ave, S.E. Washington, D.C. 20590 AUG 1 2 2009 Mr. Hank Baird General Manager AP Training, Inc. 228 1 5 Glenn Drive, Suite 1 0 1 Sterling, VA 201 64 Ref. No. 09-0 147 Dear Mr. Baird: This responds to your letter dated June 25,2009, regarding shipping paper requirements under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171- 180). Specifically, you ask about the requirement applicable to Class 1 materials for the net explosive mass of the material or article., Your questions are paraphrased and answered as follows: Q1. Is the requii-ement in 4 172.202(a)(5)(i) to communicate on shipping papers the "net explosive mass" of a Class 1 material or article required for those articles offered for transportation by aircraft? 1. In accordance with 4 1 72.202(a)(6), for transportation by aircraft, a shipping paper must indicate the total net mass of hazardous materials in a package, unless a gross mass is indicated in the Hazardous Materials Table (HMT) in 172.10 1, in which case the gross mass per package must be shown. For Class I materials transported by aircraft, the shipping paper must include an indication of the net explosive mass of the material. For explosive articles, the net explosive mass may be expressed in terms of either the net mass of the article or the explosive materials contained in the article. Q2. Is it permissible to enter both the "net explosive mass" and the "gross mass" on the shipping paper for those explosive articles or devices offered for transportation by aircraft? A2. The HMR require only the "net explosive mass" to be entered on the shipping paper for explosive articles offered for transportation by aircraft. However, nothing in the <<>> HMR prohibits the inclusion of both the net explosive mass of the material or article and the gross mass of the package on the shipping paper. I hope this satisfies you inquiry. If we can be of further assistance, please contact us. Sincerely yours, <<>> Page 1 of 1 Drakeford, Carolyn (PHMSA) From: INFOCNTR (PHMSA) Sent: Thursday, June 25,2009 9.1 1 AM To: Drakeford, Carolyn (PHMSA) Subject: FW: Letter of Interpretation Request From: Hank Baird [mailto:hbaird@alltranspack.com] Sent: Thursday, June 25, 2009 8:54 AM To: PHMSA HM Infocenter Subject: Letter of Interpretation Request The following information is a request for a Letter of Interpretation from PHMSA. For shipping paper requirements the Code of Federal Regulations Title 49 in 172.202(a)(5)(i) states: "Except for transportation by aircraft, the total quantity of hazardous materials covered by the description must be indicated ... and must include an indication of the applicable unit of measurement ... For Class 1 materials, the quantity must be the net explosive mass. For an explosive that is an article, such as Cartridges, small arms, the net explosive mass may be expressed in terms of the net mass of either the article or the explosive materials contained in the article" Question # I : Is the allowance to communicate on shipping papers the net explosive mass in terms of the net mass of the article or the explosive materials contained in the article as stated in 172.202(a)(5)(i) also permitted for those articles offered for transport by air transportation? Question #2: If the allowance to communicate on shipping papers the net explosive mass in terms of the net mass of the article or the explosive materials contained in the article is permitted for those articles offered for transport by air - is it permissible to enter BOTH quantities? Kindest regards, Hank BairdIGeneral Manager % P Tralnig, --- In'c. an ijy tB$m&n a & ~ @ Lneb Camgaay (703) 858-5169 (703) 858-51 75 fax wvwv alltran.spack.com ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `38dd20acfb65721e1971f10de6bf8c424f6053418758904c33f3fa4183fd4a39` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-22T21:39:24.360Z - Document slug: `phmsa-interpretation-09-0147` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "AP Training, Inc." ], "individuals": [ "Mr. Hank Baird" ], "refIds": [ "09-0147" ], "catalogDates": [ "2009-08-20" ], "catalogParts": [ 172 ], "catalogRowCount": 2, "sourceRecordUrls": [ "https://www.phmsa.dot.gov/node/52181" ], "linkedAttachmentUrls": [], "unavailableResponseUrls": [], "duplicateRepresentationUrls": [], "citedSections": [ "172.101", "172.202", "172.202(a)(5)(i)", "172.10" ], "catalogPageUrls": [ "https://www.phmsa.dot.gov/regulations/title49/section/172101", "https://www.phmsa.dot.gov/regulations/title49/section/172202" ], "pdfUrls": [ "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2009/090147.pdf" ], "representations": [ { "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2009/090147.pdf", "detailUrl": null, "detailHtmlPath": null, "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2009/090147.pdf", "pdfArtifactPath": "data/sources/phmsa-interpretations/09-0147-b42fe5c4d2.pdf", "pdfArtifactSha256": "f293186ca66427fa18ef2b94b9500f4286e6b5fea1714148215bf756cc10854d", "extractedTextPath": "data/sources/phmsa-interpretations/09-0147-b42fe5c4d2.v2.txt", "extractedTextSha256": "771b958bad2fb9944ea3dd9ed554dc682adfd874076daada0b69a38244b0006f", "pageCount": 3, "extractionVersion": 2 } ], "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.", "jurisdiction": "US" } ```