USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #02-0316 ([CNDT, Inc.] [Ron Petty])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: CNDT, Inc.

Individual Name: Ron Petty

Location State: CO Country: US

View the Interpretation Document

Response text:

Jan 23, 2003

Mr. Ron Petty                 Reference No. 02-0316
CNDT, Inc.
801 Front Street
Arriba, CO  80804

Dear Mr. Petty:

This is in response to your letter dated December 9, 2002 regarding magnetized material shipped by air under the Hazardous Material Regulations (HMR; 49 CFR Parts 171-180).  Specifically, you asked whether a material with a magnetic field equal to, or less than, the level specified in § 173.21(d) is subject to labeling or shipping paper requirements when shipped as air cargo.

Section 173.21 (d) forbids the carriage by aircraft of any package which has a magnetic field of more than 0.00525 gauss measured at 4.5 meters (15 feet) from any surface of the package.  If a magnetic or magnetized material does not meet the definition of any hazard class and is packaged so it does not exceed the threshold in § 173.21(d), it is not subject to the HMR and may be shipped aboard any aircraft.  If the material is offered for transportation by air the shipper may need to comply with the International Civil Aviation Organization (ICAO) Technical Instructions for the transportation of dangerous goods by aircraft.


John A. Gale
Transportation Regulations Specialist
Office of Hazardous Materials Standards


Regulation Sections

Section Subject
173.21 Forbidden materials and packages