Which ten-code indicates the unit is out of service or unavailable?

Which ten-code indicates the unit is out of service or unavailable?

• A. 10-3
• B. 10-8
• C. 10-4
• D. 10-7

Answer: (D)

Understanding unit status ten-codes. When a unit is out of service or unavailable, it signals that it’s not ready to take new assignments or respond to calls. The code for that status is 10-7. Hearing this tells dispatch and other units that you’re currently tied up or off-duty from active responses, so they’ll route requests to other available units. In contrast, 10-8 means the unit is in service and ready to respond, 10-4 is an acknowledgment that a message was received or that conditions are clear to proceed, and 10-3 means stop transmitting, often used to request a pause in radio traffic so the channel can be heard.

Understanding unit status ten-codes. When a unit is out of service or unavailable, it signals that it’s not ready to take new assignments or respond to calls. The code for that status is 10-7. Hearing this tells dispatch and other units that you’re currently tied up or off-duty from active responses, so they’ll route requests to other available units. In contrast, 10-8 means the unit is in service and ready to respond, 10-4 is an acknowledgment that a message was received or that conditions are clear to proceed, and 10-3 means stop transmitting, often used to request a pause in radio traffic so the channel can be heard.