The aircraft took off on a mission to monitor sources of fire in the region. Thirty minutes into flight, the aircraft was at an altitude of 2 000 ft AGL and at a speed of 100 KIAS, when the warning light indicating iron-dust in the engine illuminated. This was followed by a strong noise, and the engine stalled. During the emergency landing, the aircraft had a tendency to capsize, wich was counteracted by the pilot by means of the collective. As a result of this action, however, the main rotor blades ended up hitting the tail boom, severing the transmission shaft, with severe damage to the helicopter.