Which area of protection has only a single loop fire detector?

• A. MLG
• B. Wing
• C. Nose Landing Gear
• D. Fuselage

Answer: (A)

In fire protection design, the number of detector loops is tied to the size and complexity of the area being protected. Smaller, simpler spaces can be covered effectively by a single detector loop, which keeps wiring simple and reliable. The main landing gear bay is a compact, well-defined enclosure, so it can be monitored by one loop to detect heat promptly. Larger or more complex areas—like the wing or fuselage, which contain multiple compartments and more potential fire paths—need multiple detector loops to ensure full coverage and accurate localization. The nose landing gear area is typically not as large as the main gear bay, and its protection design often involves more than one loop, so it isn’t the area that uses only a single loop. Therefore, the main landing gear bay is the area with a single loop detector.