Abstract: A fire-extinguishing device of the type integrated into an aircraft, is for the controlled transportation and evacuation of fire-fighting material and may be activated from the aircraft while it is in flight, onto the area which is on fire. The fire-extinguishing device comprises at least one closed independent receptacle (3) filled with the fire-fighting material, housed within a container, which is fastened to the aircraft, which includes at least one collapsible outlet hatch for the at least one closed independent receptacle (3) and which, upon opening, frees the gravitational fall of the fire-fighting material. The at least one closed independent receptacle (3) has a built-in fill valve, with an anti-drainback mechanism which guarantees that the at least one closed independent receptacle (3) is leak tight. The built-in fill valve can be accessed through the at least one collapsible outlet hatch.