Final Report on the Dec 2016 Solvista Chair accident

Topics of a general nature regarding snowsports, which don't easily fit into one of our other Liftlines categories. This is also the place to post Letters to the Editor.

Final Report on the Dec 2016 Solvista Chair accident

Postby EMSC » Thu May 11, 2017 8:36 pm

The final report about the chairlift incident that killed a 40 year old woman is out. It's long but contains several interesting items and seems to be a confluence of events that would be difficult to duplicate. Multiple recommendations including adding 'black box' data gathering to ski lifts.

The key quotes perhaps being:
“No one on the investigative team has ever witnessed or heard of a similar event”
“Likewise, literature does not describe such an event.”

Denver Post Article
http://www.denverpost.com/2017/05/11/ski-granby-ranch-ski-lift-death-final-report/


Final Report from the Colorado Passenger Tramway Safety Board
https://drive.google.com/file/d/0B-K5DhxXxJZbQUhTaDJOUzRBNU0/view?usp=sharing
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Re: Final Report on the Dec 2016 Solvista Chair accident

Postby q » Mon May 15, 2017 3:19 am

It seems strange that a change in speed would result in a side to side swing to that extent. Also strange that if it was as bad as that in terms of slowing/speeding that it wasn't damn obvious to the resort that the lift had something technically wrong with it.
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Re: Final Report on the Dec 2016 Solvista Chair accident

Postby EMSC » Mon May 15, 2017 11:21 am

q wrote:It seems strange that a change in speed would result in a side to side swing to that extent. Also strange that if it was as bad as that in terms of slowing/speeding that it wasn't damn obvious to the resort that the lift had something technically wrong with it.


I think the implication in the report is that somehow the start/stops/speed changes that were input by the operators hit upon the natural frequency of the haul rope/tower system with highly unexpected line behavior - eg think Tacoma Narrows Bridge behavior: wind in one direction caused unbelievable movement in other directions until destruction of the bridge.
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Re: Final Report on the Dec 2016 Solvista Chair accident

Postby EMSC » Tue May 16, 2017 9:41 am

Colorado chairlift fall that killed Texas mom so improbable was “like getting hit by lightning inside a building”
http://www.denverpost.com/2017/05/15/granby-ranch-chairlift-death-improbable/
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