Crash-aerien 29 JAN 1997 d'un de Havilland Canada DHC-4A Caribou N702SC - Sparrevohn Airport, AK (SVW)
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Statuts:Accident investigation report completed and information captured
Date:mercredi 29 janvier 1997
Type/Sous-type:Silhouette image of generic DHC4 model; specific model in this crash may look slightly different
de Havilland Canada DHC-4A Caribou
Compagnie:Southcentral Air
Immatriculation: N702SC
Numéro de série: 126
Année de Fabrication: 1963
Heures de vol:13923
Moteurs: 2 Pratt & Whitney R-2000
Equipage:victimes: 1 / à bord: 2
Passagers:victimes: 0 / à bord: 0
Total:victimes: 1 / à bord: 2
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:3,5 km (2.2 milles) W of Sparrevohn Airport, AK (SVW) (   Etats-Unis d'Amérique)
Phase de vol: En approche (APR)
Aéroport de départ:St. Mary's, AK (PASM), Etats-Unis d'Amérique
Aéroport de destination:Kenai Airport, AK (ENA/PAEN), Etats-Unis d'Amérique
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:

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

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


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

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 St. Mary's, AK et Kenai Airport, AK est de 658 km (411 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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