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Accident
Last updated: 21 September 2017
Statuts:Enquête Officielle
Date:samedi 31 juillet 2010
Heure:20:24
Type/Sous-type:Silhouette image of generic CVLT model; specific model in this crash may look slightly different
Convair CV-580 Airtanker
Compagnie:Conair Aviation
Immatriculation: C-FKFY
Numéro de série: 129
Année de Fabrication: 1953
Moteurs: 2 Allison 501-D22G
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 0 / à bord: 0
Total:victimes: 2 / à bord: 2
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:15 km (9.4 milles) SE of Lytton, BC (   Canada)
Phase de vol: En vol (ENR)
Nature:Incendie
Aéroport de départ:Kamloops Airport, BC (YKA/CYKA), Canada
Aéroport de destination:Kamloops Airport, BC (YKA/CYKA), Canada
Numéro de vol: 448
Détails:
A Conair Aviation Convair CV-580 Airtanker ("Tanker 448") was destroyed when it crashed near Lytton, BC, Canada. Both crew members were killed in the accident. The airplane was contracted out to the B.C. Ministry of Forest and Lands as it fought a forest fire near Siwash Road, about 18 kilometres south of Lytton.
The CV-580 was accompanied by a Rockwell 690 Turbo Commander, which planned and directed the fire suppression activity. This included a demonstration of the bombing run and a verbal description for the tanker crew as they circled above.
The plan was for Tanker 448 to make 8 left-hand circuits, dropping 1/8 of its retardant load each time.
T448 joined the circuit for its first bombing run close to the Fraser River and then proceeded south-southwest at an altitude of 3432 feet asl and a groundspeed of 140 knots. The aircraft then descended and struck three trees on a knoll at the edge of a ravine at approximately 3020 feet asl about 8 seconds before the crash. The flight crew then dropped retardant and attempted to climb away. About 3 seconds later, the aircraft entered a left-hand spin which continued for one revolution in five seconds in a steep nose-down attitude before the aircraft struck terrain 590 feet below.

Probable Cause:

Findings as to Causes and Contributing Factors
1. It could not be determined to what extent the initial collision with trees caused damage to the aircraft which may have affected its controllability.
2. Visual illusion may have precluded recognition, or an accurate assessment, of the flight path profile in sufficient time to avoid the trees on rising terrain.
3. Visual illusion may have contributed to the development of a low energy condition which impaired the aircraft performance when overshoot action was initiated.
4. The aircraft entered an aerodynamic stall and spin from which recovery was not possible at such a low altitude.

Accident investigation:
cover
Investigating agency: TSB Canada
Status: Investigation completed
Duration: 1 year and 9 months
Accident number: A10P0244
Download report: Final report

Sources:
» CADORS report number; 2010P1088


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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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