Accident Overview
A wheel/ski-equipped DHC-3 Otter, registration C-FAGM, was operating a charter flight returning to Snegamook Lake to retrieve a hunting party of four along with their hunting gear and several hundred ptarmigan. The aircraft departed Snegamook Lake at 09:15.
Flight Sequence
Shortly after takeoff, the engine began to run rough but improved when power was reduced for cruising. As the aircraft approached Nipishish Lake, the pilot reported to company dispatch that the engine was again running rough, though he was able to maintain altitude. He indicated he would follow the Crooked River toward Goose Bay in case a precautionary landing became necessary.
Three minutes later, C-FAGM called dispatch again, advising that he intended to land on a large area on the Crooked River. He also reported an odour of smoke in the aircraft.
Impact and Fire
The aircraft was in a nose-down, left-bank attitude with flaps fully extended and skis retracted when it struck the frozen surface of the river. The Otter bounced clear of the surface, turned left, and came to rest in an upright position. Upon impact, the fuel cells ruptured and a fire erupted, destroying the aircraft.
Probable Cause
The official investigation determined that a fatigue-initiated crack in the number nine cylinder head caused the engine to run rough and lose power. While the pilot was manoeuvring for the precautionary landing in whiteout conditions, the aircraft crashed.