What device must be in working condition in order to use an elevator car sling as a running platform?

The governor and safeties must be in working condition to use an elevator car sling as a running platform because they play a critical role in ensuring the safety and proper operation of the elevator system. The governor is a device that monitors the speed of the elevator car and helps prevent it from moving too fast, while the safeties are mechanisms that engage in case of malfunction to stop the elevator safely. If either of these systems is not functional, it poses a significant risk during operation, potentially leading to dangerous situations. Ensuring that the governor and safeties are operational is essential for safe work practices when using the elevator car sling.