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Why has NRG continued to ship sensors that were possibly defective?


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Q: Why has NRG continued to ship sensors that were possibly defective?

A: There are five reasons:

  1. Prior to September we were not certain there was a problem with the sensor itself. While some believed the root cause to be boom vibration, our initial investigation told us this was likely not the case. That is why we continued to investigate the sensor itself.

  2. According to many of our customers, the data was still usable and was within the typical margin of testing error.
  3. Not all sensors exhibited dragging. Some customers reported no incidents, while others reported higher frequencies of incidents.
  4. Many variables contribute to uncertainty in wind measurement data (e.g. reference data, MCP methods, modeling, tower configuration, long term variability). Because the reported slow-down was a small piece of the whole, a piece that couldn?t be isolated, it did not make sense to pull the #40 from the market.
  5. After we identified the vibratory mode in September, we continued to ship sensors with all these factors in mind. Additionally, if we had pulled the #40, we would have taken huge capacity out of the industry.

 

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