When a unit is Out of service due to maintenance, what action should dispatch expect?

• A. The unit should resume routine duties immediately after maintenance.
• B. The unit should stay on the channel and monitor for updates.
• C. The unit should switch to a backup channel to remain available.
• D. The unit is unavailable for calls until it is back in service.

Answer: (D)

Out of service means the unit isn’t available to respond to calls. When maintenance is in progress, dispatch should not expect this unit to take new assignments or be reachable for calls until it’s back in service. Other options imply the unit is still active or ready to monitor traffic, or assume an immediate return to full duty, which isn’t guaranteed while it’s OOS. A backup channel isn’t the same as being available to handle new calls, since the unit is considered unavailable until maintenance is complete.