What condition describes resources that are checked in but not assigned due to mechanical or personnel reasons?

The term that describes resources that are checked in but not assigned due to mechanical or personnel reasons is "Out of Service." When a resource is classified as out of service, it indicates that it is temporarily unable to be deployed or utilized effectively because of issues such as mechanical failure or the unavailability of personnel who are trained to operate that resource. This classification is crucial for managing firefighting and emergency response resources, as it ensures that only those units that are operational and adequately staffed are dispatched to incidents, thereby maintaining safety and efficiency in operations.

In contrast, available resources are those that are ready for assignment, while assigned resources are those actively engaged in tasks. Unavailable resources may not be specified but could imply that they are not accessible for deployment for a variety of reasons—however, "Out of Service" is the precise term used when addressing mechanical or personnel issues specifically.