Air Accidents Investigation Branch
The aircrafts lithium-ion main battery caught fire shortly after takeoff, creating significant quantities of smoke and hazardous gases within the aircraft cabin that affected the ability of the pilot to safely control the aircraft. A passenger, sitting in the right seat, was able to open the cabin door in-flight, which reduced the level of smoke in the cabin and the aircraft landed safely.
The investigation did not identify the cause of the battery fire. The location of the battery within the aircrafts cabin exposed the occupants to significant hazards when the battery caught fire, as the battery box did not contain the combustion products or heat from the fire. A similar airborne battery fire to the same aircraft type and lithium-ion battery type was found to have occurred in Germany, resulting in destruction of the aircraft.
One Safety Recommendation is made relating to reviewing the installation requirements of lithium-ion main batteries in cabin areas of Non-Part 21 aircraft, to minimise the effect to aircraft occupants following a battery fire.