# US Dynamics Corporation — Hazardous Materials Safety Interpretation

**Citation:** 10-0087  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2010-05-28

10-0087 response to US Dynamics Corporation concerning 173.56.

## Document text

<<<PAGE 1>>>

U.S. Department of Transportation 1200 New Jersey Ave, SE
Pipeline and Hazardous Materials Washington, D.C. 20590
Safety Administration
~:AY 28 2010
Mr. George Jantzen
US Dynamics Corporation
425 Bayview Avenue
Amityville, New York 11758
Ref. No. 10-0087
Dear Mr. Jantzen:
This responds to your April 9, 2010 letter requesting clarification of the Hazardous Materials
Regulations (HMR; 49 CFR Parts 171-180). You state that your company purchases a small
explosive device from your supplier. It comes with the suppliers approval number (Le., EXnumber).
Your company then installs the unaltered part into a gyroscope prior to shipment.
Specifically, you ask if you must apply for a separate explosive approval number (i.e., EXnumber)
for the assembled gyroscope even though you have not altered the explosive
component in any way.
The answer is yes. By installing a previously approved explosive device into a new article, you
have altered the design. As a result, the proper shipping name and class may no longer be
appropriate, depending on how the explosive device is installed, the overall size and the
packaging. Thus, the article is a new explosive as defined in § 173.56(a) and must be examined,
classed, and approved in accordance with § 173.56.
I hope this information is helpful. If you have further questions, please contact this office.
Sincerely,
~~
harles E. Betts
ChI , tandards Development
Office of Hazardous Materials Standards

<<<PAGE 2>>>

E., eheVlla.A..Lb
~113. S<p
Drakeford, Carolyn (PHMSA) t=-X=p l o~,' Ve5
From: INFOCNTR (PHMSA) IO-()087
Sent: Friday, April 09,20109:58 AM
To: Drakeford, Carolyn (PHMSA)
Subject: FW: Hazmat Information Center Feedback: Hazardous Materials Table, Special Provisions,
Hazardous Materials Communications
Carolyn,
This Gentleman would like an official written request of interpretation.
Thanks,
Rob
-----Original Message----From:
PHMSA-Feedback [mailto:PHMSA-Feedback]
Sent: Friday, April 09, 2010 8:19 AM
To: PHMSA HM InfoCenter; PHMSA Webmaster
Subject: Hazmat Information Center Feedback: Hazardous Materials Table, Special Provisions,
Hazardous Materials Communications
Completed via phone by VL on 4/9 @9:3~ left vm
WE US DYNAMICS CORPORATION PURCHASE A SMALL EXPLOSIVE DEVICE FROM EAGLE PICHER OUR SUPPLIER.
IT COMES WITH THE SUPPLIERS EX NUMBER. EE DO NOT ALTER THIS PART IN ANY WAY. WE INSTALL IT IN
OUR ASSEMBLY AND SEND THE GYROSCOPE TO RAYTHEON . I HAVE CALLED NUMEROUS TIMES AND HAVE BEEN
ON QUITE A FEW HAZMAT WEBSITES AS WELL AS TALKED TO YOUR HAZMAT PEOPLE. MY QUESTION AND FROM
WHAT I AM TOLD IS WE DO NOT ALTER THS PART IN ANY WAY HOWEVER WE ASSEMBLE IT IN OUR ASSEMBLY
AND SHIP IT UNDER OUR PART NUMBER. DO WE US DYNAMICS NEED OUR OWN EX NUMBER IF WE ARE NOT
ALTERING THIS PART IN ANY WAY? IF WE DO HOW DO I GO ABOUT GETTING THIS DONE?THANK YOU
Name: GEORGE JANTZEN
Organization: US DYNAMICS CORPORATION
Email: GJANTZEN@USDYNAMICSCORPORATION.COM
Address: 425 BAYVIEW AVENUE
City: AMITYVILLE
Zip Code: 11758
Phone: 631-842-5627
FAX: 631-842-5247
1

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2010/100087.pdf>
- Source ID: `phmsa`
- SHA-256: `5e14ff964d75008857ca8c7a57a414ecd5e7e16bf1aaded2c61184844496305c`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-22T13:52:34.111Z
- Document slug: `phmsa-interpretation-10-0087`

### Source metadata

```json
{
  "materialSubtype": "interpretation",
  "interpretationArea": "hazardous_materials",
  "representation": "full_text_from_official_pdf",
  "companies": [
    "US Dynamics Corporation"
  ],
  "individuals": [
    "Mr. George Jantzen"
  ],
  "refIds": [
    "10-0087"
  ],
  "catalogDates": [
    "2010-05-28"
  ],
  "catalogParts": [
    173
  ],
  "catalogRowCount": 1,
  "sourceRecordUrls": [
    "https://www.phmsa.dot.gov/node/44901"
  ],
  "linkedAttachmentUrls": [],
  "unavailableResponseUrls": [],
  "duplicateRepresentationUrls": [],
  "citedSections": [
    "173.56",
    "173.56(a)"
  ],
  "catalogPageUrls": [
    "https://www.phmsa.dot.gov/regulations/title49/section/17356"
  ],
  "pdfUrls": [
    "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2010/100087.pdf"
  ],
  "representations": [
    {
      "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2010/100087.pdf",
      "detailUrl": null,
      "detailHtmlPath": null,
      "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretations/2010/100087.pdf",
      "pdfArtifactPath": "data/sources/phmsa-interpretations/10-0087-2f030c5d7f.pdf",
      "pdfArtifactSha256": "79ef0712ecff4d02cdf82d1a03ae45ec25ee57ce28c47f62be70cf0ac04dc042",
      "extractedTextPath": "data/sources/phmsa-interpretations/10-0087-2f030c5d7f.v2.txt",
      "extractedTextSha256": "d6f450513bdff1d2f9f799ba6c2942896669d44f36199d852557677f545ec6fb",
      "pageCount": 2,
      "extractionVersion": 2
    }
  ],
  "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.",
  "jurisdiction": "US"
}
```