Détails:
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: "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."
» NTSB Id. ANC97FA024
accident date: 29-01-1997
type: de Havilland Canada DHC-4A Caribou
registration: N700NC
| Statuts: | Accident investigation report completed and information captured |
| Date: | mercredi 29 janvier 1997 |
| Heure: | 23:10 |
| Type/Sous-type: |  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) |
| Nature: | Cargo |
| Aéroport de départ: | St. Mary's, AK (PASM), Etats-Unis d'Amérique |
| 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:
 |
|
Sources:
» ICAO Adrep Summary 3/98 (#24)» NTSB Id. ANC97FA024
Photos
accident date: 29-01-1997
type: de Havilland Canada DHC-4A Caribou
registration: N700NC
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 St. Mary's, AK et Kenai Airport, AK est de 658 km (411 miles).
Accident location: Approximate; accuracy within a few kilometers.
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.
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2023 Flight Safety Foundation