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Last updated: 21 September 2021
Statuts:Enquête Officielle
Date:dimanche 9 décembre 1956
Heure:ca 19:10
Type/Sous-type:Canadair DC-4M2 North Star
Compagnie:Trans-Canada Air Lines - TCAL
Immatriculation: CF-TFD
Numéro de série: 128
Année de Fabrication:
Moteurs: 4 Rolls-Royce Merlin 622
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 59 / à bord: 59
Total:victimes: 62 / à bord: 62
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Mount Slesse, BC (   Canada)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Vancouver International Airport, BC (YVR/CYVR), Canada
Aéroport de destination:Calgary Municipal Airport, AB (YYC/CYYC), Canada
Numéro de vol: 810-9
Détails:
Flight 810-9 departed Vancouver at 18:10 and was cleared by Air Traffic Control to Calgary via Mud Bay, Abbotsford and Cultus Lake (Red 75 and Red 44). The flight made the normal position reports giving altitude and reported icing beginning at 16000 feet, moderate turbulence 16000 feet to 18000 feet, heavy jolts at 19000 feet and at 18:48 requested clearance to 21000 feet. At 18:52, Flight 810 reported a fire in the no. 2 engine, that this engine had been shut down and that the aircraft was returning to Vancouver via Cultus and Abbotsford. Shortly afterwards the flight reported difficulty in maintaining height and requested clearance to descend on Green 1. The last altitude reported by Flight 810 was just above 15000 feet which would be maintained if possible. At 19:10 hours Flight 810 reported passing Hope, the altitude was not given but clearance to descend to 10000 feet was requested. ATC cleared Flight 810 to cross the Vancouver range at 8000 feet or above. Flight 810 acknowledged and this was the last radio contact. Nothing more was heard of the aircraft until a part was discovered by mountaineers on 12 May 1957, when they were climbing Mt. Slesse, at approximately the 7600-foot level, adjacent to the third highest peak.

Probable Cause:

PROBABLE CAUSE: "The cause for the aircraft being at an altitude low enough to strike Mount Slesse is undetermined, but there is a high probability that the aircraft, while flying on 3 engines, encountered either severe icing, turbulence, subsidence, or a combination of all three, or suffered some other difficulty of such a sudden or dire nature that the crew were unable to communicate with any agency or control the aircraft. For undetermined reasons the aircraft was not on Green Airway No. 1 to which it had been cleared by Air Traffic Control. The following factors contributed to the accident: a) Loss of engine power No. 2 engine shut-down, fire suspected.; b) Existence in the area of known subsidence, severe turbulence, and moderate to severe icing probably in the lower levels."

Sources:
» ICAO Accident Digest No.9, Circular 56-AN/51 (16-25)


Opérations de secours
It was recommended a.o. that pilots be encouraged to dump fuel in emergency situations.

Photos

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Vancouver International Airport, BC et Calgary Municipal Airport, AB est de 681 km (426 miles).
Accident location: Approximate; accuracy within a few kilometers.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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