In what scenario would an elevator be taken out of service?

An elevator would be taken out of service if its safety devices are not functioning properly. This is critical because safety devices are essential for the protection of passengers and the reliable operation of the elevator system. These devices, which may include door sensors, emergency brakes, and other essential safety features, are designed to prevent accidents and ensure the elevator operates correctly. If any of these components are malfunctioning, it poses a significant risk, which necessitates the immediate removal of the elevator from service until repairs can be made. This action prioritizes passenger safety above all else.

In contrast, routine cleaning typically doesn't pose a risk that would necessitate taking the elevator out of service, as it can often be performed while the elevator is in operation. Upgrading or researching design changes would not require taking the elevator out of service unless those changes directly impacted the operational safety systems. Additionally, having a passenger use the elevator for the first time does not warrant taking it out of service; rather, it is part of normal operations as long as the elevator is safely functional.