In the LAV, the fixed fire extinguisher will automatically release the chemical agent when the temperature reaches what degree?

In the LAV, the fixed fire extinguisher will automatically release the chemical agent when the temperature reaches what degree?

• A. 212 degrees Fahrenheit
• B. 100 degrees Fahrenheit
• C. 170 degrees Fahrenheit
• D. 140 degrees Fahrenheit

Answer: (C)

The system is triggered by heat through a fusible link that melts at a specific temperature, releasing the extinguishing agent automatically when a fire heats the area. For the lavatory fixed fire suppression system, that trigger point is 170 degrees Fahrenheit (about 77°C). This rating strikes a balance: it won’t release during normal cabin temperatures, but it will activate quickly enough to control a fire before it grows. Why the other temperatures aren’t used: 212 degrees Fahrenheit (the boiling point of water) is far higher than typical fixed-system trigger ratings and isn’t the standard fuse point. 100 and 140 degrees Fahrenheit are too low to reliably indicate a fire, which could lead to either delayed response or nuisance releases in warm surroundings.

The system is triggered by heat through a fusible link that melts at a specific temperature, releasing the extinguishing agent automatically when a fire heats the area. For the lavatory fixed fire suppression system, that trigger point is 170 degrees Fahrenheit (about 77°C). This rating strikes a balance: it won’t release during normal cabin temperatures, but it will activate quickly enough to control a fire before it grows.

Why the other temperatures aren’t used: 212 degrees Fahrenheit (the boiling point of water) is far higher than typical fixed-system trigger ratings and isn’t the standard fuse point. 100 and 140 degrees Fahrenheit are too low to reliably indicate a fire, which could lead to either delayed response or nuisance releases in warm surroundings.