Is it allowable to dispatch with one fire detection loop inoperative for a given area?

• A. True
• B. False
• C. Not specified
• D. Only if the other loop is functional

Answer: (B)

Fire detection is a safety-critical system that relies on redundancy to maintain coverage. When one detection loop in a given area is inoperative, there is a monitoring gap in that area, increasing the risk of late fire detection and rapid escalation. Because the integrity of fire detection cannot be guaranteed with a loop out of service, dispatch with a loop inoperative is not allowed; the loop should be repaired or the area isolated until full functionality is restored (or the situation is addressed under the applicable MEL). Even if another loop remains functional, the inoperative loop leaves part of the area unmonitored, so the scenario is not acceptable.