“Service Utility” is the usable capacity that at acquisition was expected to be used to provide service. It is NOT “Level of Utilization” which is the portion of usable capacity currently being used. The current usable capacity may be less than the original capacity without significant impact.
An example of a significant decline in service utility would be a building fire where the building was not usable across multiple months and all people/ services had to be relocated during restoration.
An example of an insignificant decline in service utility would be if a tornado damaged part of a roof, but services in the building continued as they were able to repair the roof without moving people or services.
In the event, where services and personnel were moved temporarily, during restoration of the asset on a short-term basis (ex. 1-3 weeks). Then accounting will work with your department to determine significance related to decline in service utility directly.