Which detector type is common in aircraft hangars due to rapid flame detection?

• A. Smoke
• B. Heat
• C. CO
• D. Flame

Answer: (D)

Rapid flame detection is crucial in aircraft hangars because these spaces are large, filled with flammable fuels, and fires can spread quickly. A flame detector is designed to sense the radiant energy from a flame almost immediately, triggering alarms and suppression systems without waiting for smoke to build up or for a significant heat rise. These detectors are often tuned to specific wavelengths produced by hydrocarbon flames (like infrared), which helps them respond fast while minimizing false alarms from normal hangar activity. Smoke detectors rely on particles and can be delayed or triggered by dust and ventilation; heat detectors respond only to temperature changes and may not detect a fast-running flame quickly enough. CO detectors sense gas from combustion but may not indicate a fire until after flames are already well established. In this environment, the speed of flame radiation detection makes flame detectors the best choice.