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Welcome to the CPL Air Law question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.
CASR Part 137 - Aerial application operations applies the common language definition as the application of materials from the air. I guess that would including spraying solutions such as defoliation or fertilizer agents or solid materials such as super phosphate from an aircraft. I would likely include 'water bombing' for bush fires. It's not easy to find a clear detailed definition though.