Aircraft General Knowledgemedium#338
A fuel quantity indicating system (FQIS) typically uses what type of sensor?
A
Float-type mechanical gauges
B
Capacitance probes
CorrectC
Ultrasonic flow meters
D
Pitot-type pressure sensors
Explanation
Modern FQIS uses capacitance probes; the dielectric constant difference between fuel and air changes the capacitance, indicating fuel level.
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