GlossaryResponse performance and resources
Out of service
Out of service means a resource is unavailable for normal assignment under the applicable status rules; it does not necessarily mean broken.
Out of service is a resource status indicating that a unit cannot accept its normal assignments under the applicable rules. The reason may involve equipment, personnel, rest, or another operational limitation. It describes availability, not necessarily a permanent condition or mechanical failure.
The U.S. Fire Administration's June 2016 Field Operations Guide defines out-of-service incident resources as unable to respond for mechanical, rest, or personnel reasons. A local computer-aided dispatch system may distinguish these reasons through more detailed codes. USFA Field Operations Guide
What the status changes
An out-of-service vehicle may still appear on a fleet inventory or at a station. Ownership and physical presence do not establish operational readiness. A service report should distinguish vehicles owned, vehicles staffed, and resources actually available for assignment.
The status can also be temporary. A unit's record may show an out-of-service start and a later return to service. Measuring downtime requires both endpoints and a consistent rule for which reasons are included.
Example
Hypothetical: An engine is taken out of service at 08:00 because of a vehicle problem. The crew transfers to a reserve engine, which enters service at 08:30. The original vehicle remains unavailable until 14:00.
The vehicle was out of service for six hours, but the crew's engine-response capability was interrupted for thirty minutes in this example. Those are different measures. A fleet-maintenance report and a service-coverage report could therefore present different totals without contradicting one another.
If the agency's records identify only the original vehicle, further information would be needed to establish when replacement capacity became available.
Common confusion
Out of service is not always the same as busy. A unit assigned to an incident is unavailable for another assignment because it is working, but many systems track “assigned” separately from “out of service.” Combining the categories can conceal whether resources were occupied or not operational.
It also differs from a station closing. One vehicle can be unavailable while other resources continue operating from the same facility. A status entry should not be expanded into a claim that a whole station or agency ceased service.
Local interpretation
Read the codebook and any reason field before attributing the status to staffing, maintenance, or another cause. The abbreviation alone may be insufficient.
For comparisons, specify whether downtime is measured by vehicle, crew, or functional response unit. Account for reserve vehicles and replacement staffing where documented. Otherwise a change in status-recording practices can look like a change in service capacity.
Related terms
Sources
- USFA Field Operations Guide, June 2016 — Glossary definition of out-of-service resources and distinction among assigned, available, and out-of-service status.