What condition activates a lavatory fire extinguishing bottle?

What condition activates a lavatory fire extinguishing bottle?

• A. Heat in the area that melts the solder in the discharge tip
• B. Smoke in the lavatory cabinet
• C. Manual switch pulled by crew
• D. Overpressure in lavatory duct

Answer: (A)

Automatic activation of a lavatory extinguishing bottle relies on heat in the lavatory area. The discharge tip is held closed by a fusible link (a solder) that melts at a specific temperature. When a fire heats the area enough, the solder melts, the valve opens, and the extinguishing agent is released into the lavatory to suppress the fire. Smoke in the cabinet or overpressure in the duct isn’t what opens the bottle, and while there is a manual switch for crew-initiated discharge, that action is separate from the automatic condition.

Automatic activation of a lavatory extinguishing bottle relies on heat in the lavatory area. The discharge tip is held closed by a fusible link (a solder) that melts at a specific temperature. When a fire heats the area enough, the solder melts, the valve opens, and the extinguishing agent is released into the lavatory to suppress the fire. Smoke in the cabinet or overpressure in the duct isn’t what opens the bottle, and while there is a manual switch for crew-initiated discharge, that action is separate from the automatic condition.