Jetconnect B738 at Sydney on Jun 10th 2014, wheel hub fracture during roll out
Last Update: June 10, 2015 / 15:33:27 GMT/Zulu time
Australia's Transportation Safety Board (ATSB) released their final report without a formal conclusion or safety message.
The ATSB reported that a licensed maintenance engineer found the inboard wheel half hub had fractured into a number of pieces, the wheel bearings were intact. Examination showed no indication of bearing cup rotation (a known wheel failure scenario that had been addressed by a service bulletin already). Nonetheless, the origin of the failure was identified in the area of bearing bore radius, from where a series of cracks had grown axially and circumferentially around the inboard hub. The ATSB wrote: "The wheel manufacturer also examined the failure. They concluded it was likely that the fatigue crack initiated in the stress-concentrated, transition region between the bearing bore wall and the circumferential radius. Ultrasonic testing of this area detected possible small fatigue cracks or origins."
The ATSB wrote: "Examination of the maintenance records, from the 15 months before the inboard wheel-half failure, found that the wheel manufacturer’s recommended inspections had been performed whenever the wheel had been removed from the aircraft."
The ATSB reported that the operator took a safety action: "The ATSB was advised by the aircraft operator that they are upgrading their fleet with carbon brakes from a different manufacturer. As a result, all current main wheel assemblies will be replaced with wheels from that manufacturer; hence, those wheels will have a different part number. The modification program of fitment with new wheels and brakes commenced in February 2015 and will be completed by the end of May 2015."
Fractured hub from the inboard wheel half and chevrons leading from the damaged, radius-area origin;
This article is published under license from Avherald.com. © of text by Avherald.com.
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