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Statuts:Enquête Préliminaire
Date:mardi 17 juillet 1990
Heure:16:40
Type/Sous-type:Silhouette image of generic DHC5 model; specific model in this crash may look slightly different
de Havilland Canada DHC-5D Buffalo
Compagnie:Fuerza Aérea Ecuatoriana
Immatriculation: HC-BFH
Numéro de série: 64
Année de Fabrication: 1976
Equipage:victimes: 0 / à bord: 2
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 2
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Calgary International Airport, AB (YYC) (   Canada)
Phase de vol: A l'atterrissage (LDG)
Nature:Convoyage
Aéroport de départ:Billings-Logan International Airport, MT (BIL/KBIL), Etats-Unis d'Amérique
Aéroport de destination:Calgary International Airport, AB (YYC/CYYC), Canada
Détails:
When the DHC-5D Buffalo touched down on runway 28 at Calgary International Airport, AB (YYC), the nosegear collapsed. Hydraulic fluid ignited and the aircraft burned out.

The aircraft was operating on a ferry flight from Quito, Ecuador to Calgary, Canada for repairs. Due to a previous accident the landing gear remained down during the ferry flight.

Probable Cause:

It was concluded that the self-centering mechanism could be forced off centre because of a system malfunction caused by the previous accident or by intentional nosewheel steering input, which would cause enough pressure to shear the pins. The internal damage to the controlcam mechanism allowed the wheels to be off centre at touchdown. Marks on the adjacent sides of the pulleys showed that the cable had been lodged in the space between the two pulleys. Although the extent of this damage was limited, it was representative of damage caused by the previous jungle accident and would have caused the sluggish response to nosewheel commands experienced earlier by the crew. When the weight of the aircraft settled on the misaligned nosewheel, the temporary ferry repairs failed in overload and the nosewheel collapsed.

Sources:
» Aviation Letter 287
» ICAO Adrep Summary 3/90 (#8)
» Scramble Vol.12, nr.05


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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 Billings-Logan International Airport, MT et Calgary International Airport, AB est de 710 km (443 miles).

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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