Accident
Last updated: 16 April 2014
Statuts:Enquête Officielle
Date:mardi 26 décembre 1989
Heure:22:30 PST
Type/Sous-type:British Aerospace 3101 Jetstream 31
Opérant pour:United Express
Loué à :North Pacific Airlines - NPA
Immatriculation: N410UE
Numéro de série: 776
Année de Fabrication: 1987
Heures de vol:4972
Cycles:7168
Moteurs: 2 Garrett TPE331-10UG-514H
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 4 / à bord: 4
Total:victimes: 6 / à bord: 6
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Pasco-Tri-Cities Airport, WA (PSC) (   Etats-Unis d'Amérique) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Yakima Air Terminal, WA (YKM/KYKM), Etats-Unis d'Amérique
Aéroport de destination:Pasco-Tri-Cities Airport, WA (PSC), Etats-Unis d'Amérique
Numéro de vol:2415
Détails:
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: "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."

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

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - USA
report status: Final
report number: NTSB/AAR-91-06
report released:04-NOV-1991
duration of investigation:678 days (1 year 10.4 months)
download report: Unstabilized Approach and Loss of Controll NPA, Inc. dba United Express Flight 2415 British Aerospace BA-3101, N410UE, Tri-Cities Airport Pasco, Washington December 26, 1989. (NTSB/AAR-91-06)
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Opérations de secours

NTSB issued 7 Safety Recommendations

Show all AD's and Safety Recommendations

Photos

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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Yakima Air Terminal, WA et Pasco-Tri-Cities Airport, WA est de 114 km (71 miles).

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