Never fly an RPA (remotely piloted aircraft ie drone, model aircraft or multi-rotor) near bush fires. Even a small RPA could bring down an aircraft or helicopter, so flying one any where near a bush fire could lead to fire fighting aircraft being grounded as they often have to fly very low.
If an RPA were to hit a fire fighting helicopter tail rotor or aircraft propeller they could be badly damaged, with possible loss of control by the pilot and a risk of serious injury.
The collision risk means if an unapproved RPA is on or adjacent to a fire ground fire, fighting authorities may be forced to ground their aircraft, putting lives and property at risk.
Operators of both commercial and recreational RPAs are required to comply with Part 101 of the Civil Aviation Safety Regulations. Among other things it is an offense to operate a remotely piloted aircraft in controlled or restricted airspace without approval or to operate in a way that creates a hazard to another aircraft, person or property.
For more information see CASAs RPA & Bush Fires leaflet Also an ABC News article: Firefighting helicopters to be grounded if drones spotted