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Last updated: 15 November 2019
Statuts:Enquête Officielle
Date:jeudi 1 janvier 2004
Heure:16:24
Type/Sous-type:Silhouette image of generic MD81 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-81 (MD-81)
Compagnie:Japan Air System
Immatriculation: JA8297
Numéro de série: 49908/1749
Année de Fabrication: 1990
Heures de vol:26050
Moteurs: 2 Pratt & Whitney JT8D-217C
Equipage:victimes: 0 / à bord: 6
Passagers:victimes: 0 / à bord: 163
Total:victimes: 0 / à bord: 169
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Tokunoshima Airport (TKN) (   Japon)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Kagoshima Airport (KOJ/RJFK), Japon
Aéroport de destination:Tokunoshima Airport (TKN/RJKN), Japon
Numéro de vol: 979
Détails:
A McDonnell Douglas MD-81 passenger plane, registered JA8297, sustained substantial damage in a landing gear collapsed accident at Tokunoshima Airport (TKN), Japan. There were 163 passengers and six crew members on board. Three passengers were slightly injured.
JAS Flight 979 took off from Kagoshima Airport at 15:35 and flew to Tokunoshima Airport. On landing at Tokunoshima Airport runway 01, the aircraft's left main landing gear (MLG) collapsed during rollout and its left wing tip contacted the ground. The aircraft came to a stop on the runway.

Probable Cause:

PROBABLE CAUSE:
In this accident, it is estimated that due to the left main landing gear cylinder collapsed immediately after the aircraft landed at Tokunoshima Airport, the fuselage inclined to the left and the aircraft traveled with its left wing in contact with the runway surface, resulting substantial damage.
With respect to the collapse of the MLG cylinder, it is considered that Gear Walks which experienced before the restrictor was installed generated large stresses on the fuse section of the cylinder surface and caused micro cracks. The micro cracks are considered to grow during normal operation and eventually lead to the fracture.
Further, it is considered that the presence of surface flaw on the cylinder caused by grit-blast contributed to the crack generation.
And the contributing factor to the fact that the company could not detect the cracks on the cylinder by the scheduled maintenance, etc. is considered to be that the manufacturer had not established appropriate inspection intervals or inspection times to detect fatigue cracking.

Sources:
» Yomiuri


Opérations de secours

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Photos

photo of MD-81-JA8297
accident date: 01-01-2004
type: McDonnell Douglas MD-81
registration: JA8297
photo of MD-81-JA8297
accident date: 01-01-2004
type: McDonnell Douglas MD-81
registration: JA8297
 

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 Kagoshima Airport et Tokunoshima Airport est de 472 km (295 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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