Which type of fuel gauge may require periodic calibration to maintain accuracy?

The correct answer regarding which type of fuel gauge may require periodic calibration to maintain accuracy includes both capacitive and electronic gauges.

Capacitive gauges work on a principle where the level of fuel within a tank changes the capacitance between the sensor and ground or a reference electrode. Over time, factors such as temperature variations, material degradation, and the presence of contaminants can alter the capacitance readings, leading to inaccuracies. Therefore, routine calibration is essential to ensure that the gauge continues to provide precise information about the fuel level.

Similarly, electronic gauges, which often rely on sensors and digital processing, can drift from their calibrated settings due to various factors, including changes in signal integrity, degradation of electronic components, or shifts in the characteristics of the fuel itself. To ensure reliability and accuracy, these gauges must also be calibrated periodically.

While mechanical gauges, which typically utilize float systems or other simple mechanical means to measure fuel levels, tend to maintain their accuracy over time as they rely on straightforward physical principles and less complex technology, they do not require the same level of calibration.

Thus, periodic calibration is a crucial practice for both capacitive and electronic fuel gauge systems to ensure they remain accurate and reliable for aircraft operations.