(b)(4).According to information received, the support arm broke at the joint above the first bend.The support arm is by design a casting product.No parts or pictures were received back for investigation.Neither was information of how or under which circumstances the support arm broke received.Previous investigations of the support arm led to a change of the manufacturing process in order to obtain a higher mechanical strength of the support arm.This change was implemented in production during september 2009.It is unknown if the reported support arm was manufactured before, or after, the implementation of this change.Therefore, the cause for this event cannot be determined.
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