Beschrijving:
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
| Status: | Accident investigation report completed and information captured |
| Datum: | woensdag 29 januari 1997 |
| Tijd: | 23:10 |
| Type: |  de Havilland Canada DHC-4A Caribou |
| Luchtvaartmaatschappij: | Southcentral Air |
| Registratie: | N702SC |
| Constructienummer: | 126 |
| Bouwjaar: | 1963 |
| Aantal vlieguren: | 13923 |
| Motoren: | 2 Pratt & Whitney R-2000 |
| Bemanning: | slachtoffers: 1 / inzittenden: 2 |
| Passagiers: | slachtoffers: 0 / inzittenden: 0 |
| Totaal: | slachtoffers: 1 / inzittenden: 2 |
| Schade: | Vernield |
| Gevolgen: | Written off (damaged beyond repair) |
| Plaats: | 3,5 km (2.2 mijl) W of Sparrevohn Airport, AK (SVW) ( Verenigde Staten)
|
| Fase: | Nadering (APR) |
| Soort vlucht: | Vracht |
| Vliegveld van vertrek: | St. Mary's, AK (PASM), Verenigde Staten |
| Kenai Airport, AK (ENA/PAEN), Verenigde Staten |
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:
 |
|
Bronnen:
» ICAO Adrep Summary 3/98 (#24)» NTSB Id. ANC97FA024
Foto's
accident date: 29-01-1997
type: de Havilland Canada DHC-4A Caribou
registration: N700NC
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 St. Mary's, AK en Kenai Airport, AK bedraagt 658 km (411 miles).
Accident location: Approximate; accuracy within a few kilometers.
De afstand tussen St. Mary's, AK en Kenai Airport, AK bedraagt 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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