Wind turbines are sitting on very tall hollow tubes. Workers climb up the inside of the tube to the top where they perform maintenance and repair. In the event that a repair is needed to be done on the blade of a wind turbine, workers are actually lowered by rope to get the job done. Here are a couple of pictures of workers doing some work on the blade of a turbine:
Above Photographs by Jigar Mehta/The New York Times
Here is a view from inside a turbine:
And here is a shot of a worker up top:
Hope this helps!
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