Détails:
A McDonnell-Douglas MD-82, operating as Alaska Airlines flight 255 from Los Angeles, California, to Seattle, Washington, sustained substantial damage when its nose landing gear collapsed during landing roll-out on runway 16L at Seattle-Tacoma International Airport. Seventeen of the 111 passengers incurred minor injuries during the emergency evacuation commanded by the captain after the airplane slid to a stop. There was no fire.
The flight was uneventful until the landing gear was extended and the nose landing gear warning light indicated an unsafe landing gear indication. At that time, the crew initiated a go-around (retracting the landing gear), climbed to a safe altitude in safe airspace, and then completed appropriate checklists in an attempt to obtain a safe gear-down indication with the landing gear extended. After completing appropriate checklists, the mechanical nose landing gear position indicator indicated that the nose landing gear was extended in a down and locked position, while the light continued to indicate an unsafe condition. The crew elected to land, and requested emergency equipment standing by.
The captain stated that he landed the airplane smoothly; at about 60 knots indicated airspeed, the nose settled onto the runway and the airplane slid to a stop. The airplane slid about 1300 feet and drifted slightly to the right of centerline. He commanded an evacuation.
PROBABLE CAUSE: "Fatigue failure of the nose landing gear upper lock link, due in part to reduced strength after the manufacturing process was changed from forged to machined plate stock; and inadequate non-destructive inspection process for testing the link."
| Statuts: | Accident investigation report completed and information captured |
| Date: | lundi 1 septembre 1997 |
| Heure: | 21:10 |
| Type/Sous-type: |  McDonnell Douglas MD-82 |
| Compagnie: | Alaska Airlines |
| Immatriculation: | N951AS |
| Numéro de série: | 49111/1064 |
| Année de Fabrication: | 1982-03-11 (15 years 6 months) |
| Heures de vol: | 45378 |
| Moteurs: | 2 Pratt & Whitney JT8D-217 |
| Equipage: | victimes: 0 / à bord: 5 |
| Passagers: | victimes: 0 / à bord: 111 |
| Total: | victimes: 0 / à bord: 116 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Repaired |
| Lieu de l'accident: | Seattle/Tacoma International Airport, WA (SEA) ( Etats-Unis d'Amérique)
|
| Phase de vol: | A l'atterrissage (LDG) |
| Nature: | Transport de Passagers Nat. |
| Aéroport de départ: | Los Angeles International Airport, CA (LAX/KLAX), Etats-Unis d'Amérique |
| Seattle/Tacoma International Airport, WA (SEA/KSEA), Etats-Unis d'Amérique | |
| Numéro de vol: | AS255 |
A McDonnell-Douglas MD-82, operating as Alaska Airlines flight 255 from Los Angeles, California, to Seattle, Washington, sustained substantial damage when its nose landing gear collapsed during landing roll-out on runway 16L at Seattle-Tacoma International Airport. Seventeen of the 111 passengers incurred minor injuries during the emergency evacuation commanded by the captain after the airplane slid to a stop. There was no fire.
The flight was uneventful until the landing gear was extended and the nose landing gear warning light indicated an unsafe landing gear indication. At that time, the crew initiated a go-around (retracting the landing gear), climbed to a safe altitude in safe airspace, and then completed appropriate checklists in an attempt to obtain a safe gear-down indication with the landing gear extended. After completing appropriate checklists, the mechanical nose landing gear position indicator indicated that the nose landing gear was extended in a down and locked position, while the light continued to indicate an unsafe condition. The crew elected to land, and requested emergency equipment standing by.
The captain stated that he landed the airplane smoothly; at about 60 knots indicated airspeed, the nose settled onto the runway and the airplane slid to a stop. The airplane slid about 1300 feet and drifted slightly to the right of centerline. He commanded an evacuation.
Probable Cause:
PROBABLE CAUSE: "Fatigue failure of the nose landing gear upper lock link, due in part to reduced strength after the manufacturing process was changed from forged to machined plate stock; and inadequate non-destructive inspection process for testing the link."
Accident investigation:
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Sources:
» NTSBPhotos
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 Los Angeles International Airport, CA et Seattle/Tacoma International Airport, WA est de 1527 km (954 miles).
La distance entre Los Angeles International Airport, CA et Seattle/Tacoma International Airport, WA est de 1527 km (954 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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