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Accident description
Last updated: 21 October 2017
Status:Preliminary - official
Date:Tuesday 17 July 1990
Time:16:40
Type:Silhouette image of generic DHC5 model; specific model in this crash may look slightly different
de Havilland Canada DHC-5D Buffalo
Operator:Fuerza Aérea Ecuatoriana
Registration: HC-BFH
C/n / msn: 64
First flight: 1976
Crew:Fatalities: 0 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 0 / Occupants: 2
Airplane damage: Damaged beyond repair
Location:Calgary International Airport, AB (YYC) (   Canada)
Phase: Landing (LDG)
Nature:Ferry/positioning
Departure airport:Billings-Logan International Airport, MT (BIL/KBIL), United States of America
Destination airport:Calgary International Airport, AB (YYC/CYYC), Canada
Narrative:
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.

Classification:

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


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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Billings-Logan International Airport, MT to Calgary International Airport, AB as the crow flies is 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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