# AECOM — Hazardous Materials Safety Interpretation **Citation:** 19-0123 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 2020-04-15 19-0123 response to AECOM concerning 173.220. ## Document text <<>> U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration 1200 New Jersey Avenue, SE Washington, DC 20590 April 15, 2020 Ms. Danielle Heaney Compliance Specialist AECOM 1600 Perimeter Park Morrisville, NC 27560 Reference No. 19-0123 Dear Ms. Heaney: This letter is in response to your October 16, 2019 email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171–180) applicable to the proper shipping description for internal combustion engines. Specifically, you seek confirmation that interpretation letters issued under Reference Nos. 04-0249 and 13-0125 pertaining to exceptions to the HMR for a cleaned and purged jet engine with a “spark gap” contained in a securely installed exciter box remain valid, regardless of the changes in proper shipping name and United Nations (UN) number and a more representative hazard class for engines, internal combustion. The answer is yes. The letters of clarification issued under Reference Nos. 04-0249 and 13-0125 remain valid. The Pipeline and Hazardous Materials Safety Administration (PHMSA) would consider a cleaned and purged jet engine with a “spark gap” contained in a securely installed exciter box to be excepted from the requirements of the HMR, provided the applicable requirements in 49 CFR § 173.220 are met. I hope this information is helpful. Please contact us if we can be of further assistance. Sincerely, T. Glenn Foster T. Glenn Foster Chief, Standards and Rulemaking Division Office of Hazardous Material Standards <<>> Dodd, Alice (PHMSA) From: INFOCNTR (PHMSA) Sent: To: Subject: Attachments: Wednesday, October 16, 2019 3:16 PM Hazmat Interps FW: Request for Letter of Interpretation Request for Letter of Interpretation.pdf Hello Alice and lkeya, Please see attached for letter of interpretation request. The requester spoke with Breanna in the HMIC. Breanna checked with Mike Ciccarone who confirmed that the letter she asked about was still valid, and that it was ultimately the shipper's responsibility to classify the material and ensure the material is meeting the requirements of the section. Please contact our office with any questions. Thanks, Kathryn, HMIC From: Heaney, Danielle [mailto:Danielle.Heaney@aecom.com] Sent: Wednesday, October 16, 2019 2:34 PM To: INFOCNTR (PHMSA) Subject: Request for Letter of Interpretation Good Afternoon, I have attached a request for a letter of interpretation. Thanks, Danielle Heaney Environmental Scientist Dangerous Goods Shipping Compliance / EHS Department D +1-919-461-1324 danielle.heaney@aecom.com AECOM 1600 Perimeter Park Drive Suite 400 Morrisville, NC 27560, USA T +1-919-461-1100 ~E;lt,Qm,corn Built to deliver a.better world 1 <<>> AECOM lmag ne1t Delivered AECOM 1600 Perimeter Park Morrisville, NC 27560 aecom.com October 16, 2019 Mr. Shane Kelley Director, Standards and Rulemaking Division U.S. DOT/PHMSA (PHH-10) 1200 New Jersey Avenue, SE East Building, 2nd Floor Washington, DC 20590 Clarification on DOT Letter of Interpretation 04-0249 Dear Mr. Shane Kelley, I am writing to confirm that the DOT regulatory interpretation 04-0249 (issued on February 10, 2005) and DOT regulatory interpretation 13-0125 (issued on July 31 , 2013) remain valid, due to a change in the Proper Shipping Name and UN Number and a more representative hazard class for engines, internal combustion. For example: The previous DOT Basic Description UN3166, Engines, internal combustion, Class 9 was changed to UN3528, Engine, internal combustion flammable liquid powered, Class 3. Both the old and new UN Numbers still reference 49 CFR 173.220. I spoke with a DOT representative at the Hazardous Materials Information Center on September 20, 2019 and the representative confirmed that the DOT Letter Interpretation 04-0249 was still valid . Please confirm that a cleaned and purged jet engine with a "spark gap" contained in a securely installed exciter box is still excepted from the requirements of the Hazardous Material Regulations, provided the applicable requirements in 49 CFR 173.220 are met. Carriers and freight forwarders are questioning the validity due to the change of the Proper Shipping Name and the UN Number. Please note that this is a frequently used interpretation. I would appreciate your assistance with these questions. Sincerely, fl~n~ Environmental Scientist Ill/Dangerous Goods Shipping Compliance Specialist AECOM T: (919) 461 -1 100 E: danielle.heaney@aecom.com aecom.com 1/1 ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `2d4c80bfe67e9c6e70c5dc09fdb1daba134a60a3972f09cbb46dd6d08e534fe8` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-22T14:59:45.654Z - Document slug: `phmsa-interpretation-19-0123` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "AECOM" ], "individuals": [ "Ms. Danielle Heaney" ], "refIds": [ "19-0123" ], "catalogDates": [ "2020-04-15" ], "catalogParts": [ 173 ], "catalogRowCount": 1, "sourceRecordUrls": [ "https://www.phmsa.dot.gov/node/72041" ], "linkedAttachmentUrls": [], "unavailableResponseUrls": [], "duplicateRepresentationUrls": [], "citedSections": [ "173.220" ], "catalogPageUrls": [ "https://www.phmsa.dot.gov/regulations/title49/section/173220" ], "pdfUrls": [ "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/73641/190123.pdf" ], "representations": [ { "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/73641/190123.pdf", "detailUrl": null, "detailHtmlPath": null, "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/docs/standards-rulemaking/hazmat/interpretations/73641/190123.pdf", "pdfArtifactPath": "data/sources/phmsa-interpretations/19-0123-0bfc6d2a80.pdf", "pdfArtifactSha256": "dd08c6c29a22828416793899d0bf30e64dcea49f135fa4b925bfb6e6cd49a6c7", "extractedTextPath": "data/sources/phmsa-interpretations/19-0123-0bfc6d2a80.v2.txt", "extractedTextSha256": "840698424ed1ffca65487ef2e2ccae45f0b70c3b5c1d9bac9a3f098aabaf0660", "pageCount": 3, "extractionVersion": 2 } ], "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.", "jurisdiction": "US" } ```