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Statuts:Enquête Officielle
Date:mercredi 3 mai 1989
Type/Sous-type:Armstrong Whitworth AW-650 Argosy 222
Compagnie:IPEC - Interstate Parcel Express Company
Immatriculation: VH-IPA
Numéro de série: 6803
Année de Fabrication: 1965-04-28 (24 years )
Equipage:victimes: 0 / à bord: 2
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 2
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Melbourne-Tullamarine Airport, VIC (MEL) (   Australie)
Phase de vol: Au roulage (TXI)
Aéroport de départ:Sydney-Kingsford Smith International Airport, NSW (SYD/YSSY), Australie
Aéroport de destination:Melbourne-Tullamarine Airport, VIC (MEL/YMML), Australie
While taxiing after a normal landing, a rumbling noise was heard from the vicinity of the nosegear, the hydraulic low pressure light illuminated and nosegear steering authority was lost. The right hand nosewheel had separated from the aircraft due to fracturing of the axle. As the nosewheel departed it damaged the nosegear uplock assembly with consequent loss of hydraulic system integrity. It then continued under the fuselage causing skin damage.
The nosewheel axle was recovered and subjected to metallurgical examination which showed that the fracture was due to fatigue. The fracture resulted from prior long term fatigue cracking which occupied approximately 75 of the cross sectional area of the axle. Stress corrosion cracks were present which were the most likely initiator of the fatigue cracks. A mandatory crack inspection requirement called up for this axle did not cover the specific area in which the stress corrosion was located. Consequently, during the axle refurbishment, the stress corrosion cracks were covered by a layer of electroplated chromium.

Probable Cause:

Significant Factors:
1. The nosewheel axle failed due to fatigue initiated by stress corrosion cracks.
2. The recurrent Non Destructive Inspection for the axles does not address the area where the stress corrosion occured. Consequently, pre- and post- refurbishment inspections did not detect the cracks.

Accident investigation:
Investigating agency: BASI
Status: Investigation completed
Duration: 289 days (10 months)
Accident number: 198901542
Download report: Summary report
Language: English

Opérations de secours
Upon advice of the failure mode by the Bureau, the operator carried out an inspection of all inservice and spare axles, to remove any axles with stress corrosion under the electroplated chromium.

ATSB issued 1 Safety Recommendation

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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 Sydney-Kingsford Smith International Airport, NSW et Melbourne-Tullamarine Airport, VIC est de 703 km (440 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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