Most of the time fire occurs in unpredicted locations. It may occur in forest, buildings or in the middle of ocean. This paper talks about the extinguishing of fire using drones, fire accidents could be critical and accessing the situation at an early stage is very important in order to suppress the fire and evacuate the residents, as well as in the recent times forest and bush fires too have become a matter of concern which we face a hard time extinguishing as the fire fighters can’t reach out to first in dense forests. In these cases, aerial robot platforms have advantages because of its ability to access the place that is hard to reach. This paper elaborates ways to develop a firefighting UAV that operates in a Semi-autonomous manner by using Monoammonium-phosphate (NH4H2PO4) payload as the fire extinguishing agent.