I spoke with a firefighter that actually works a the airport and trains putting out such fires, he says that it is often impossible to completely put down such post-crash fires, you spray first lightly to help with evacuation and later to keep the fire under reasonable control but often because of the amount of stored energy in the wreck it will keep smoldering but hopefully not too violently, evacuation is top priority and the rest is secondary.
Last edited by olasek; 21st Jul 2013 at 08:28.