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 #07-0163 ([Midwest Airlines, Air Cargo] [Mr. David Puhl])

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

Interpretation Response Details

Response Publish Date:

Company Name: Midwest Airlines, Air Cargo

Individual Name: Mr. David Puhl

Location State: WI Country: US

View the Interpretation Document

Response text:

Nov 26, 2007

Mr. David Puhl

Midwest Airlines, Air Cargo

301 W. Air Cargo Way

Milwaukee, Wisconsin 53207

Ref. No.: 07-0163

Dear Mr. Puhl:

This is in response to your letter dated August 13, 2007 concerning the applicability of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) to shipments of dry ice transported by aircraft.  You state that Midwest Airlines and its subsidiary Skyway Airlines operate as "will-not carry" airlines in accordance with Federal Aviation Administration regulations.  Specifically, you ask if a shipment of dry ice which is offered for transportation in accordance with the exception specified in § 173.217(f) is considered a hazardous material under the HMR and whether a "will-not carry" airline operator is authorized to transport dry ice offered for transportation in accordance with the exception.  Your concern lies with the statement in § 173.217(f) that reads ""excepted from all other requirements of this subchapter."  You ask whether this statement, when used in this section, and elsewhere in the HMR, indicates that the item in question is no longer considered a "hazardous material" as defined in § 171.8 when all requirements of the paragraph are met.

A hazardous material, as defined in § 171.8, means a substance or material that the Secretary of Transportation has determined is capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and has designated as hazardous under § 5103 of Federal hazardous materials transportation law (49 U.S.C. 5101 et seq.). The term includes hazardous substances, hazardous wastes, marine pollutants, elevated temperature materials, materials designated as hazardous in the Hazardous Materials Table (HMT; § 172.101), and materials that meet the defining criteria for hazard classes and divisions in Part 173 of the HMR.

Section 173.217(f) provides an exception from all other requirements of the HMR for Carbon dioxide, solid (dry ice), when offered or transported by aircraft, in quantities not exceeding 2.3 kg (5 pounds) per package and used as a refrigerant for the contents of the package provided: (1) the dry ice is packed in a packaging which meets the general packaging requirements of Subpart B of Part 173; (2) the packaging is designed and constructed to permit the release of carbon dioxide gas to prevent a build-up of pressure that could rupture the packaging; (3) not more than 200 kg (441 pounds) of solid carbon dioxide is transported in any one cargo compartment or bin on any aircraft except by specific and special written arrangement between the shipper and the aircraft operator; and (4) the package is marked "Carbon dioxide, solid" or "Dry ice", marked with the name of the contents being cooled, and marked with the net weight of the dry ice or an indication the net weight is 2.3 kg (5 pounds) or less.

The statement in the HMR that reads "" is not subject to the requirements of this subchapter," does not indicate that a material is not a "hazardous material," as defined in § 171.8.  It does indicate that if the material is prepared for transportation and transported in accordance with the applicable paragraph, it does not have to satisfy any other requirements of the HMR.  For the purposes of the HMR, dry ice is considered to be a hazardous material, despite the exception from certain requirements in § 173.217.  However, there are some exceptions in the HMR for items that are not considered to be "hazardous materials," which because of design, size, content, and/or packaging have been determined to pose minimal safety risks in transportation (e.g., the exceptions in § 173.134(b) for Division 6.2 (infectious substance) materials).

If you have any questions concerning aircraft operational requirements, including the carriage of excepted hazardous materials by "will-not carry" airlines under 14 CFR, we suggest you contact the Federal Aviation Administration's Office of Hazardous Materials at

(202) 267-7530.

I hope this information is helpful.


Edward T. Mazzullo

Director, Office of Hazardous

Materials Standards

173.217(f), 171.8

Regulation Sections

Section Subject
171.8 Definitions and abbreviations
173.217 Carbon dioxide, solid (dry ice)