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Last updated: 15 August 2020
Estado:Final
Fecha:domingo 5 enero 1997
Hora:12:43 MST
Tipo:Silhouette image of generic SW4 model; specific model in this crash may look slightly different
Swearingen SA227-AC Metro III
Operador:Skylink Charter
Registración: N165SW
Numéro de série: AC-514
Año de Construcción: 1982
Horas Totales de la Célula:25111
Motores: 2 Garrett TPE331-11U-612
Tripulación:Fatalidades: 0 / Ocupantes: 2
Pasajeros:Fatalidades: 0 / Ocupantes: 19
Total:Fatalidades: 0 / Ocupantes: 21
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:Bullhead City, AZ (   Estados Unidos de América)
Fase: Aproximación (APR)
Naturaleza:Vuelo Doméstico No Programado
Aeropuerto de Salida:Long Beach Municipal Airport, CA (LGB/KLGB), Estados Unidos de América
Aeropuerto de Llegada:Grand Canyon-National Park Airport, AZ (GCN/KGCN), Estados Unidos de América
Descripción:
Instrument meteorological conditions prevailed at the destination Grand Canyon and the aircraft was cleared for a localizer instrument approach. The weather was below landing minimums and the pilot executed a missed approach. He then diverted to the company designated alternate airport at Bullhead City. The aircraft was 6.5 miles out on final approach for Bullhead City runway 34 when both engines lost power. A forced landing was carried out in a dry wash. The gear collapsed and the aircraft skidded 100 feet before coming to rest near Highway 95.
The aircraft had probably encountered weather conditions causing light to moderate rime icing. Ice from the unheated propeller spinner dome, which is difficult to detect or discern visually, was possibly shed into the engine inlets after descent into warmer air during the approach phase. The ice ingestion disturbs the air flow which then causes the flameout when the ignition is not on.

Probable Cause:

PROBABLE CAUSE: "Failure of the pilot(s) to use 'override' ignition as prescribed by checklist procedures during an encounter with icing conditions, which subsequently led to ice ingestion and dual engine flame-outs. Factors related to the accident were: the adverse weather (icing) conditions, the accumulation of airframe/engine ice, and lack of suitable terrain in the emergency landing area. "

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 3 months
Accident number: LAX97FA082
Download report: Summary report

Fuentes:
» Air Safety Week 3 February 1997
» NTSB Identification: LAX97FA082
» Ice Ingestion Causes Both Engines to Flame Out During Air-taxi Turboprop’s Final Approach


Subsiguiente / acciones de seguridad

NTSB issued 2 Safety Recommendations

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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 Long Beach Municipal Airport, CA to Grand Canyon-National Park Airport, AZ as the crow flies is 593 km (371 miles).

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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