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Status:Voorlopig - officieel
Datum:dinsdag 17 juli 1990
Tijd:16:40
Type:Silhouette image of generic DHC5 model; specific model in this crash may look slightly different
de Havilland Canada DHC-5D Buffalo
Luchtvaartmaatschappij:Fuerza Aérea Ecuatoriana
Registratie: HC-BFH
Constructienummer: 64
Bouwjaar: 1976
Bemanning:slachtoffers: 0 / inzittenden: 2
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 0 / inzittenden: 2
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:Calgary International Airport, AB (YYC) (   Canada)
Fase: Landing (LDG)
Soort vlucht:Ferry
Vliegveld van vertrek:Billings-Logan International Airport, MT (BIL/KBIL), Verenigde Staten
Vliegveld van aankomst:Calgary International Airport, AB (YYC/CYYC), Canada
Beschrijving:
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.

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


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Billings-Logan International Airport, MT en Calgary International Airport, AB bedraagt 710 km (443 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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