Descripción del Accidente ASN 29 JAN 1997 de Havilland Canada DHC-4A Caribou N702SC - Sparrevohn Airport, AK (SVW)
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Estado:Accident investigation report completed and information captured
Fecha:mircoles 29 enero 1997
Hora:23:10
Tipo:Silhouette image of generic DHC4 model; specific model in this crash may look slightly different
de Havilland Canada DHC-4A Caribou
Operador:Southcentral Air
Registración: N702SC
Numéro de série: 126
Año de Construcción: 1963
Horas Totales de la Célula:13923
Motores: 2 Pratt & Whitney R-2000
Tripulación:Fatalidades: 1 / Ocupantes: 2
Pasajeros:Fatalidades: 0 / Ocupantes: 0
Total:Fatalidades: 1 / Ocupantes: 2
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:3,5 km (2.2 milles) W of Sparrevohn Airport, AK (SVW) (   Estados Unidos de América)
Fase: Aproximación (APR)
Naturaleza:Carga
Aeropuerto de Salida:St. Mary's, AK (PASM), Estados Unidos de América
Aeropuerto de Llegada:Kenai Airport, AK (ENA/PAEN), Estados Unidos de América
Descripción:
On its way from St. Mary's to Kenai the aircraft suffered engine problems (no. 2 prop overspeed). The engine was feathered, and the crew elected to divert to Aniak. When the no. 1 engine produced banging noises, forcing the crew to divert to nearby Sparrevohn. Sparrevohn Airport is located on the slope of mountainous terrain, approach is only authorized during daylight, with a landing approach only from the South and a go-around improbable.
While spiralling down over the airfield, the crew encountered severe turbulence from the surrounding mountains. Full power on the no. 1 engine was applied, but the aircraft collided with snow covered upsloping terrain.

Probable Cause:

PROBABLE CAUSE: "Loss of the right engine propeller control oil, which led to an overspeed of the right engine and propeller, and necessitated a shut-down of the right engine; and failure of the pilot to maintain adequate altitude/distance from terrain during visual approach for a precautionary landing at an alternate airport. Factors relating to the accident were: fluctuation of the left engine power, premature lowering of the airplane flaps, and an encounter with adverse weather conditions (including high winds, severe turbulence, and white-out conditions) during the approach."

Accident investigation:

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Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 4 months
Accident number: ANC97FA024
Download report: Summary report

Fuentes:
» ICAO Adrep Summary 3/98 (#24)
» NTSB Id. ANC97FA024


Fotos

photo of DHC-4A-Caribou-N700NC
accident date: 29-01-1997
type: de Havilland Canada DHC-4A Caribou
registration: N700NC
 

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 St. Mary's, AK to Kenai Airport, AK as the crow flies is 658 km (411 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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