Technical Assessment of Dry Ice Limits on Aircraft (2013) / Chapter Skim
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Pages 48-51
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From page 48... ...
48 The technical findings of this project show that establishing limits based on package area is more technically sound than the current dry ice inventory limits based on dry ice mass and on standard sublimation rates. However PHMSA, in Part 173, specifically bases its packaging, labeling, and documentation requirements on the mass of dry ice.
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From page 49... ...
49 Recommended Future Technical Studies on Dry Ice Sublimation Assessment of Sublimation Rates from Palletized Packages Some packages may be palletized and act like a single large package or even like an insulated ULD in that the overall configuration limits the rate of heat gain.* How to reliably specify the heat transfer for this situation requires information on industry practices and the configurations of freight actually seen in the system.
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From page 50... ...
50 Obtaining Further Technical Data on Aircraft Operations Dry Ice in Passenger Cabin from Carry-On Packages Additional information on the number of passengers that carry packages containing dry ice on board with them would be helpful. Although this mode is not believed to be a significant source of carbon dioxide, actual survey data on the number of such packages would increase the certainty of the estimates used to come to this conclusion.
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From page 51... ...
51 Improving Precision for the Decision Tool As additional technical data become available, it is likely that the proposed decision tool itself could be refined. For example, independent third-party measurements of the dry ice loss rates of insulated ULDs are presently not available.
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