We recently performed an analysis at a building that had more than 30 elevators. One particular bank had 6 elevators and the section of the building served by these elevators had a relatively low occupancy.
As part of our initial study we gather empirical data, meaning we go out and look at stuff. We observed longer wait times than we would expect from equipment of this type. The customer hadn’t noticed anything out of the ordinary and the tenants hadn’t complained.
As our analysis progressed, it became evident that one elevator was not responding to hall calls. Everything else was operating normally. Janitorial was able to key the elevator down for routine cleaning. Security was able to do the same for daily communication checks. The elevator even recalled for the monthly Fireman’s Service check.
We brought our findings to the customer’s attention and they authorized Byrd Analytics to do a forensic study to see how long the condition had existed. We found that the elevator hadn’t answered a hall call for 7 months, 12 days, 5 hours and 27 minutes. The customer then went back through their records and found that there was an issue with the elevator that lasted for a week or so before it was fixed.
What had happened was, during the troubleshooting process, the maintenance mechanic had removed the unit from “Group Operation” so he could run the elevator on test for a couple of days, to verify the elevator was truly fixed. The mechanic had since been reassigned to another route and the new mechanic had no reason to think the elevators weren’t running normally. Why the elevator was not returned to the group is anyone’s guess. Bottom line, the elevator was returned to the group and the wait times fell right in line with where they should be.