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Last updated: 18 January 2022
Status:Definitief
Datum:woensdag 29 januari 1997
Tijd:23:10
Type:Silhouette image of generic DHC4 model; specific model in this crash may look slightly different
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
Vliegveld van aankomst:Kenai Airport, AK (ENA/PAEN), Verenigde Staten
Beschrijving:
On it's 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:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 4 months
Accident number: ANC97FA024
Download report: Summary report

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


Foto's

photo of DHC-4A-Caribou-N700NC
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.

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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