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Accident
Last updated: 23 October 2017
Estado:Final
Fecha:martes 26 diciembre 1989
Hora:22:30
Tipo:Silhouette image of generic JS31 model; specific model in this crash may look slightly different
British Aerospace 3101 Jetstream 31
Operated by:North Pacific Airlines - NPA
On behalf of:United Express
Registración: N410UE
Numéro de série: 776
Año de Construcción: 1987
Horas Totales de la Célula:4972
Ciclos:7168
Motores: 2 Garrett TPE331-10UG-514H
Tripulación:Fatalidades: 2 / Ocupantes: 2
Pasajeros:Fatalidades: 4 / Ocupantes: 4
Total:Fatalidades: 6 / Ocupantes: 6
Daños en la Aeronave: Destruido
Consecuencias: Written off (damaged beyond repair)
Ubicación:Pasco-Tri-Cities Airport, WA (PSC) (   Estados Unidos de América)
Fase: Aproximación (APR)
Naturaleza:Vuelo Doméstico Programado
Aeropuerto de Salida:Yakima Air Terminal, WA (YKM/KYKM), Estados Unidos de América
Aeropuerto de Llegada:Pasco-Tri-Cities Airport, WA (PSC/KPSC), Estados Unidos de América
Número de Vuelo:2415
Descripción:
United Express Flight 2415 took off from Seattle for a flight to Pasco via Yakima. While flying into Yakima, the flight encountered icing conditions. After landing, the first officer (together with a deadheading pilot) knocked ice of the wings. The NPA station agent at Yakima asked the captain if he wanted to deice the aircraft, or just the tail plane, since both pilots just removed the ice from the wings. The captain declined both offers.
The aircraft took off again at 22.03 using runway 27. Since Pasco tower was closing at 22:30, Seattle Center cleared the flight for an ILS runway 21R approach. At 22:30 the aircraft was observed descending fast from a higher than normal altitude. The aircraft suddenly nosed over and crashed short of the runway.

Probable Cause:

PROBABLE CAUSE: "The flight crew's decision to continue an unstabilized instrument landing system approach that led to a stall, most likely of the horizontal stabilizer, and loss of control at low altitude. Contributing to the accident was the air traffic controller's improper vectors that positioned the airplane inside the outer marker while it was still well above the glide slope. Contributing to the stall and loss of control was the accumulation of airframe ice that degraded the aerodynamic performance of the airplane."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 10 months
Accident number: NTSB/AAR-91-06
Download report: Final report

Fuentes:
» NTSB Safety Recommendations A-94-70 through -72
» Ian Churchill
» NTSB Safety Recommendations A-92-59 through -65
» NTSB/AAR-91/06


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NTSB issued 7 Safety Recommendations

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Map
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 Yakima Air Terminal, WA to Pasco-Tri-Cities Airport, WA as the crow flies is 114 km (71 miles).
Accident location: Exact; deduced from official accident report.

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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