Hazardous Materials: Fuel Cell Cartridges and Systems Transported on Board Passenger Aircraft in Carry-on Baggage

Summary: PHMSA is proposing to amend the Hazardous Materials Regulations (HMR) to permit certain fuel cell cartridges and fuel cell systems designed for portable electronic devices to be transported by passengers and crew in carry-on baggage on board passenger-carrying aircraft. The proposed rule would cover fuel cells containing certain hazardous materials (flammable liquids, including methanol; formic acid; certain borohydride materials; or butane) and meeting certain performance and consumer use standards, which we are proposing to incorporate by reference into the HMR. We have evaluated the possible transportation safety risks presented by these fuel cell cartridges and systems and have determined they may safely be transported in the cabin of a passenger-carrying aircraft.