PHMSA-2009-0238 (HM-224G): Hazardous Materials: Chemical Oxygen Generators; Direct final rule; Effective Date: 11/16/09.

SUMMARY: This direct final rule amends the Hazardous Materials Regulations to revise the quantity limitation from 25 kg ‘‘gross’’ to 25 kg ‘‘net’’ for packages of chemical oxygen generators transported aboard cargo aircraft only. The intended effect of this rule is to provide regulatory relief by raising the quantity threshold for shipments of chemical oxygen generators transported aboard cargo aircraft only. This action is necessary to address difficulties concerning implementation and compliance with the requirements for the transportation of chemical oxygen generators in outer packagings meeting certain flame penetration resistance standards and thermal protection capabilities, as evidenced by comments received from the hazardous materials industry and other interested parties. The amendment contained in this rule is a minor substantive change, in the public interest, and unlikely to result in adverse comment.

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