FAA Powerplant Written Practice Test

Which fire detection system operates on the principle of a buildup of gas pressure proportional to temperature?

1. Lindbergh Continuous-Element System

2. Photoelectric smoke detector

3. Thermal expansion system

4. Heat-sensitive circuit

The correct answer is: Lindbergh Continuous-Element System

The Lindbergh Continuous-Element System operates based on the principle of a buildup of gas pressure that is proportional to temperature changes. In this type of fire detection system, a gas or fluid is contained within a chamber. As the temperature in the environment rises due to a fire, the pressure of the gas or fluid increases. This pressure change can be accurately monitored and directed to trigger an alarm or warning system. This principle is effective because it provides a continuous measure of temperature changes, allowing for timely detection of potential fire hazards. The ability to detect even small increments in temperature makes this system sensitive and reliable for aviation applications, where early fire detection is critical for safety. In contrast, other systems like photoelectric smoke detectors rely on the scattering of light due to smoke particles, and thermal expansion systems might utilize different principles such as mechanical expansion rather than direct gas pressure measurement. Heat-sensitive circuits typically depend on electrical conductivity changes rather than a gas pressure buildup. Thus, the unique operation of the Lindbergh system sets it apart from these alternatives.