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Mr.
Plavsic fell down an open elevator shaft and suffered a major head
injury. We investigated the accident and determined that the interlock
system between the elevator car and the hoistway doors had failed and allowed
the doors to open when the car was not present. We also discovered that
the interlock mechanism had been altered in such a manner that it masked this
failure. To demonstrate this failure, we created a 3-D model and
animation. We also built an exemplar interlock and demonstrated the
actual failure mode and the masking alterations.
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