According to the user facility, the support arm has been repaired by a third party service provider.No parts were returned.Investigation was based on picture received.According to the picture, the support arm broke at the joint second nearest to the bracket.The support arm is a casting and it most probably developed a crack at an earlier occasion either by overloading or impact and this led to the reported breaking.The support arm has been successfully tested for mechanical strength and is designed according to standard.Previous investigations of similar faults led to a redesign and change of the manufacturing process in order to obtain a higher mechanical strength of the support arm.The support arm associated with this complaint had been manufactured before this change was implemented in production.(b)(4).
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