Library filed under Structural Failure from Canada

'Forgotten washer' heard in hub before wind turbine collapsed in Cape Breton

Enercon's email did not elaborate on the hub's damage. However, documents from the Labour Department regarding a subsequent stop-work order said a hub assembly was damaged in a "bearing failure" in March 2016. On Aug. 17, workers tested the turbine's lightning-protection system, which required positioning the blades so they pitched into the wind.
15 May 2017

http://www.windaction.org/posts?location=Canada&topic=Structural+Failure
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