# Northern Air Cargo — Hazardous Materials Safety Interpretation **Citation:** 15-0044 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 2016-10-14 15-0044 response to Northern Air Cargo concerning 171.22, 173.115. ## Document text <<>> of Transportation U.S. Department 1200 New Jersey Avenue, SE Washington, D.C. 20590 Materials Safety Pipeline and Hazardous Administration OCT 1 32016 Mr. Mark Smith Hazardous Materials Instructor Northern Air Cargo 3900 Old International Airport Rd. Anchorage, AK 99502 Reference No. 15-0044 Dear Mr. Smith: This responds to your December 22, 2014 letter requesting clarification on transporting aerosols under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) and the International Civil Aviation Organization's Technical Instructions for the Safe Transport of Dangerous Goods by Air (ICAO TI). We apologize for the delay in responding and any inconvenience this may have caused. You note that the ICAO TI dangerous goods list shows seventeen UN1950 "Aerosols" entries with varying primary and subsidiary hazards, while the HMR hazardous materials table (HMT) only lists five "Aerosols" entries. You further note that no person may offer for transportation or transport a hazardous material that is a forbidden material or package that meets one of the provisions in § 171.22(e). In your request you provide an example of a product that is described under the ICAO TI as "Aerosols, flammable 2.1 (6.1) PG III", and noting that this is not an entry in the HMT, ask how an air carrier can ensure the material is not forbidden for transport as required by § 171.22(e) if the material is not listed in the HMT? Section 173.115(1)(6) prohibits the transportation of substances of Division 6.1, PG I or II, and substances of Class 8, PG I in an aerosol container. This prohibition is in line with the Dangerous Goods List (DGL) entries for similar aerosols in the ICAO TI. Section 173.115(I)(5) requires that when the aerosol contents are classified as Division 6.1, PG III or Class 8, PG II or III, the aerosol must be assigned a subsidiary hazard of Division 6.1 or Class 8, as appropriate. The transport conditions and quantity authorizations for the HMT entry "UN 1950 Aerosols, flammable" align with the DGL entry "UN 1950 Aerosols, flammable 2.1 (6.1) PG III." In this specific case, in order to verify that the shipment is not forbidden one should consult the appropriate HMT entry for the primary hazard (UN 1950 Aerosols, Flammable). I trust this information is helpful. If you have further questions, please do not hesitate to contact this office. Sincerely, Duane A. Pfund International Standards Coordinator Standards and Rulemaking Division <<>> Webb 8171.22(e) Forbidden Materials 15-0044 05 March 2015 NORTHERN AIR CARGO U.S. Department of Transportation PHMSA Office of Hazardous Materials Standards Attn: PHH-10 East Building 1200 New Jersey Avenue, SE Washington, D.C. 20590-0001 RE: Seeking clarification to a discrepancy A discrepancy exists between 49CFR (HMR) and the ICAO Technical Instructions for the Safe Transport of Dangerous Goods by Air (ICAO TI). As per §171.22 (e) Forbidden materials. No person may offer for transportation or transport a hazardous material that is a forbidden material or package as designated in— (1) Section 173.21 of this subchapter; (2) Column (3) of the §172.101 Table of this subchapter; (3) Column (9A) of the §172.101 Table of this subchapter when offered for transportation or transported on passenger aircraft or passenger railcar; or (4) Column (9B) of the §172.101 Table of this subchapter when offered for transportation or transported by cargo aircraft. Listed in the dangerous goods list, Table 3-1, of the ICAO TI, there are 17 entries for the UN number of "UN1950" and the proper shipping name of "Aerosols" listed below in brevity. UN1950 Aerosols, 2.1 UN1950 Aerosols, 2.1 (6.1) PG I| UN1950 Aerosols, 2.1 (6.1) PG III (8) PG III UN1950 Aerosols, 2.3 (2.1) UN1950 Aerosols, 2.1 (8) PG I| UN1950 Aerosols, 2.1 (8) PG III UN1950 Aerosols, 2.1 (engine starting fluid) UN1950 Aerosols, 2.1 (6.1) PG III UN1950 Aerosols, 2.2 UN1950 Aerosols, 2.2 (8) PG II UN1950 Aerosols, 2.2 (6.1) PG III (8) PG III UN1950 Aerosols, 2.2 (6.1) PG II (other than tear gas devices) UN1950 Aerosols, 2.3 UN1950 Aerosols, 2.2 (8) PG III UN1950 Aerosols, 2.2 (6.1) (tear gas devices) UN1950 Aerosols, 2.2 (6.1) PG III UN1950 Aerosols, 2.2 (5.1) 907-243-3331 NORTHERN AIR CARGO INC 3900 Old International Airport Rd Anchorage AK 99502 800-727-2141 FAX 907-249-5190 WWW.NORTHERNAIRCARGO.COM <<>> Within the HMR, we have listed only 5 entries for "UN1950" and "Aerosols". 2 2 UN1950 228 A34/306 None Nonet 75 kg 150 kg. Aerosols. fammable. (each not exceeding 1 L capeotyl 2.1 UN1950 2.1 N82/306 None None 75 kg 150 kg. Aerosols, flammable, no.s. (engine starting fuic esch not exceeding 1 L capacity 2. 1 UN1950 2.1 N82/306 304 None Forbidden 150 kg Aerosols, non-flammable (each not exceeding f L capacity) 2.2 UN1950 2.2 306 None None 76 kg 150 kg. Herosols. poison, Packing Group I (each not exceeding 1 L capacity) 2 2 UN1950 (306 None None Forbidden Forbidden, Below is an example of an SDS (MSDS) that has ICAO entries used for domestic DOT transport, but does not exist within the HMR. http://www.crcindustries.com/faxdocs/rsds/3058.odf 14. Transport information DOT UN proper shipping name UN number UN1950 Transport hazard classes) Aerosois, flammable. Limited Quantity, MARINE POLLUTANT Class Label(s) Subsidiary risk 6.1(PGIII) 2.1 2.1 Packing group Environmental hazards Not applicable Special precautions for user Read safety instructions. SDS and emergency procedures before handling. Marine pollutant Yes Packaging exceptions Special provisions Packaging bulk Packaging non bulk None None IATA UN number uN proper shipping name UN1950 Transport hazard classes) Aerosols, flammable. containing substances in Division 8.1, Packing Group ill Subsidiary risk Class 2.1 Packing group Environmental hazards Not applicable. ERG Code Special precautions for user Read safety instructions. SDS and emergency procedures before handling. Other information Passenger and cargo aircraft Allowed Cargo aircraft only Allowed With this ICAO TI entry discrepancy, we would be unable to comply with §171.22(e) of the HMR as it cannot be verified it is in compliance. 907-243-3331 800-727-2141 FAX 907-249-5190 NORTHERN AIR CARGO INC 3900 Old International Airport Rd Anchorage AK 99502 WWW.NORTHERNAIRCARGO.COM <<>> Would it be the case that 171.22(e) would not apply in this example? In the example above, the entry UN1950, Aersols, 2.1(6.1) is not present and therefore not shown as Forbidden in the HMT. Would it then be the case that 171.22(d) would apply as its regulated by the ICAO TI and packaging instruction PI203 would be used for domestic compliance? We are seeking clarification to this HMR / ICAO TI discrepancy and any assistance in this matter is greatly appreciated If you have any questions, please do not hesitate to contact me directly. Sincerely, MARA Mark Smith Hazardous Materials Instructor Northern Air Cargo msmith @nac-aero 907-249-5186 907-243-3331 NORTHERN AIR CARGO INC 3900 Old International Airport Rd Anchorage AK 99502 800-727-2141 FAX 907-249-5190 WWW.NORTHERNAIRCARGO COM ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `30e717d1ec317c8f7c273f64f17ac663984189f4f8f1b4415e478373d42b48c4` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-23T15:44:22.202Z - Document slug: `phmsa-interpretation-15-0044` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "Northern Air Cargo" ], "individuals": [ "Mr. Mark Smith" ], "refIds": [ "15-0044" ], "catalogDates": [ "2016-10-14" ], "catalogParts": [ 171, 173 ], "catalogRowCount": 2, "sourceRecordUrls": [ "https://www.phmsa.dot.gov/node/45951" ], "linkedAttachmentUrls": [], "unavailableResponseUrls": [], "duplicateRepresentationUrls": [], "citedSections": [ "171.22", "171.22(e)", "173.115", "173.115(1)(6)", "173.21", "172.101" ], "catalogPageUrls": [ "https://www.phmsa.dot.gov/regulations/title49/section/17122", "https://www.phmsa.dot.gov/regulations/title49/section/173115" ], "pdfUrls": [ "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2016/150044.pdf" ], "representations": [ { "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2016/150044.pdf", "detailUrl": null, "detailHtmlPath": null, "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2016/150044.pdf", "pdfArtifactPath": "data/sources/phmsa-interpretations/15-0044-22f4cb0029.pdf", "pdfArtifactSha256": "db7bbb321b4833a819358c3443d0072e6deda42b16fff13cdbe11f3d61d0f2a7", "extractedTextPath": "data/sources/phmsa-interpretations/15-0044-22f4cb0029.v2.txt", "extractedTextSha256": "57a171be2a037b6f2c410681f72a2bb9bdc253d28f4da6b8dddbafec3973291e", "pageCount": 4, "extractionVersion": 2 } ], "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.", "jurisdiction": "US" } ```