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Last updated: 26 November 2020
Statuts:Enquête Officielle
Date:mardi 13 mars 2007
Type/Sous-type:Silhouette image of generic DH8D model; specific model in this crash may look slightly different
de Havilland Canada DHC-8-402Q Dash 8
Opérant pour:All Nippon Airways - ANA
Loué à :Air Central Co.
Immatriculation: JA849A
Numéro de série: 4106
Année de Fabrication: 2005-04-11 (1 year 11 months)
Heures de vol:2996
Moteurs: 2 Pratt & Whitney Canada PW150A
Equipage:victimes: 0 / à bord: 4
Passagers:victimes: 0 / à bord: 56
Total:victimes: 0 / à bord: 60
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Kochi Airport (KCZ) (   Japon)
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Osaka-Itami Airport (ITM/RJOO), Japon
Aéroport de destination:Kochi Airport (KCZ/RJOK), Japon
Numéro de vol:1603
A Boeing 737-881 (WL), JA849A, sustained substantial damage in a landing accident at Kochi Airport (KCZ), Japan. There were 56 passengers and four crew members on board. There were no injuries.
All Nippon Airways flight 1603 took off from Osaka (ITM) at 08:21 on a regular domestic flight to Kochi. At 08:47 the flight was given clearance to land on runway 32. However, when configuring the aircraft for landing, it appeared that the nose landing gear would not deploy. The approach was abandoned and the airplane entered a holding pattern. The crew members attempted to deploy the nose undercarriage but the attempts failed. Two low passes were flown, at 500 feet over the runway. The crew then attempted to extend the nose landing gear by utilizing acceleration force during a steep turn. When this did not work, a touch-and-go was made so as to apply an impact to the nose landing gear. The flight crew when concluded that they had to make a landing with the nose gear retracted.
The captain directed the cabin attendants to move some passengers to aft cabin and fire extinguishing agent was sprayed on the runway. At 10:54 a landing was carried out. The airplane sustained structural damage on the lower part of the forward fuselage.

Probable Cause:

PROBABLE CAUSE: "It is recognized that this accident was caused by that, in spite of gear down operations in flight by normal and alternative procedures, the nose landing gear could not be extended because the doors of the nose landing gear remained closed, and when the Aircraft landed in this configuration, the lower part of the forward fuselage contacted the runway surface and was damaged.
It is recognized that the doors of the nose landing gear remained closed because the spacer migrated out from the hinge part of the toggle link assy, which was part of the nose landing gear door linkage mechanism, interfered with the support fitting, thereby prevented the movement of the toggle link assy, which resulted in restraining the movement of the entire nose landing gear door linkage mechanism.
It is estimated that the spacer migrated out because the bolt, nut and the like were not installed, and the spacer was gradually pulled aft out of the toggle link assy under the influence of retractions/extensions of the nose landing gear, airframe vibration, aircraft acceleration and so on, during operations of the Aircraft. Regarding that the bolt, nut and the like were not installed, it is considered that these parts were not re-installed at the time of the repair in the manufacturing process of the Aircraft."

Accident investigation:
Investigating agency: JTSB
Status: Investigation completed
Duration: 1 year and 3 months
Accident number: AA2008-5
Download report: Final report

Opérations de secours

JTSB issued 1 Safety Recommendation

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photo of DHC-8-402Q-Dash-8-JA849A
accident date: 13-03-2007
type: de Havilland Canada DHC-8-402Q Dash 8
registration: JA849A
photo of DHC-8-402Q-Dash-8-JA849A
accident date: 13-03-2007
type: de Havilland Canada DHC-8-402Q Dash 8
registration: JA849A

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 Osaka-Itami Airport et Kochi Airport est de 212 km (132 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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