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Last updated: 30 November 2020
Statuts:Enquête Officielle
Date:dimanche 5 janvier 1997
Heure:12:43 MST
Type/Sous-type:Silhouette image of generic SW4 model; specific model in this crash may look slightly different
Swearingen SA227-AC Metro III
Compagnie:Skylink Charter
Immatriculation: N165SW
Numéro de série: AC-514
Année de Fabrication: 1982
Heures de vol:25111
Moteurs: 2 Garrett TPE331-11U-612
Equipage:victimes: 0 / à bord: 2
Passagers:victimes: 0 / à bord: 19
Total:victimes: 0 / à bord: 21
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Bullhead City, AZ (   Etats-Unis d'Amérique)
Phase de vol: En approche (APR)
Nature:Charter National
Aéroport de départ:Long Beach Municipal Airport, CA (LGB/KLGB), Etats-Unis d'Amérique
Aéroport de destination:Grand Canyon-National Park Airport, AZ (GCN/KGCN), Etats-Unis d'Amérique
Détails:
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

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


Opérations de secours

NTSB issued 2 Safety Recommendations

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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 Long Beach Municipal Airport, CA et Grand Canyon-National Park Airport, AZ est de 593 km (371 miles).

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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