We apologize for the delay in this response.
Regulations do exist addressing servicing and maintenance operations.
This standard applies with respect to potential hazard of a falling bus body during maintenance operations. This new rule requires that, in general, before servicing or maintenance is performed on machinery or equipment, the machinery or equipment must be turned off and disconnected from the energy source, and the energy isolating device must be either locked or tagged out. In-ground vehicle hoists may provide sufficient protection depending on their design and utilization. Additionally, manufacturers recommendations and specifications should be followed. We hope this helps to clarify your concerns.