The aircraft, with the pilot and four passengers on board, departed Blackbushe from runway 08 in fog with a visibility of less than 500 metres. As the aircraft reached the upwind end of the runway it was seen to bank to the left before disappearing from view. It crashed 13 seconds later into a factory complex where a major fire ensued. All on board were fatally injured. A substantial amount of the aircraft structure was consumed by fire. Engineering examination of that which remained showed that there was no malfunction found within the engines, propellers or controls that would have affected the flight. Analysis of the cockpit voice recorder however showed a reduction in one of the propellers rpm as the aircraft rotated that would have led to thrust asymmetry. Through a combination of lack of visual reference, confusion as to the cause of the power reduction and possible disorientation the pilot lost control of the aircraft and although he may have realised the situation seconds before impact with the ground there was insufficient height available to effect a safe recovery.