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This report describes tests made to compare "dry powder" and chlorobromomethane as materials for first-aid applications to aircraft crash fires. The tests showed chlorobromomethane to be slightly superior as an extinguishing agent on the size of fire described and under the weather conditions prevailing. Both materials suffered from the disadvantage of permitting "flashing back". With the dry powder was associated a sudden transient increase of the air temperatures in the aircraft cockpit, while under certain circumstances the atmosphere produced by the use of chlorobromomethane contained an undesirably high proportion of toxic products.