No fatalities

Aircraft Overturns After Ski Failure During Take-Off at Cowan Lake (CF-DFF)

Cowan Lake, CanadaTakeoff (climb)

On April 7, 1951, a Noorduyn Norseman (registration CF-DFF) operated by Northern Airlines was involved in an aviation accident near Cowan Lake, Canada during takeoff. No fatalities were reported. Investigators recorded the probable cause as: The probable cause of this accident was a forced landing on the starboard ski due to failure of the port oleo leg during take-off. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A).

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 2026-06-12Data APIEditorial standards

An aircraft with six passengers overturned after the port ski failed during take-off at Cowan Lake, Saskatchewan. The pilot performed a forced landing on the starboard ski, but the aircraft settled and caught fire. All occupants escaped with minor injuries.

Incident Overview

An aircraft departed from Cowan Lake, Saskatchewan, carrying six passengers. During the take-off roll, as the aircraft was about to become airborne, the port ski became detached from the undercarriage leg. The ski remained attached to the aircraft only by the rear cheek cable. The pilot immediately reduced power and executed a landing on the starboard ski.

Sequence of Events

After touching down, the aircraft continued for approximately 200 to 300 feet on the starboard ski. It then settled onto the port side and subsequently turned over onto its back. All seven occupants—the pilot and six passengers—escaped the overturned aircraft with minor injuries. The aircraft was completely consumed by fire following the accident.

Investigation and Probable Cause

An investigation determined the probable cause of the accident. The official finding states: "The probable cause of this accident was a forced landing on the starboard ski due to failure of the port oleo leg during take-off."