The information provided to pilots in the form of the low level alert results from a physical measure (sensors dry or wet) rather than from a calculation.Do not provide pilots with a continuous indication of the fuel quantity in the wing tanks, but only the signal that the fuel level has reached below 750 kg (threshold crossed).The low level sensors are fully independent from the Fuel Quantity Indication, and are different in that they: If two sensors in the same tank remain dry for more than 30 seconds, a low level alert triggers in the cockpit (fig.2).
These sensors are located in such a way that they become dry when the remaining fuel in the tank is approximately 750 kg. In addition to the sensors and probes feeding the FQI system, each wing tank is equipped with three independent dedicated low level sensors. The ECAM can then display fuel temperature and mass as calculated by the FQIC.Īdditionally, there is an independent system sensing low fuel level, which would alert the pilots even if something goes wrong with the normal FQIS: Using the densitometer (or the backup CIC), the conversion from volume to mass is performed by the FQIC. (Airbus A320 FCOM - Fuel Description - Fuel Quantity Indication and Level Sensing) one Capacitance Index Compensator (CIC) in each inner tank giving the dielectric constant of the fuel in case of cadensicon failure.one densitometer (cadensicon) sensor in each wing inner tank permitting the calculation of the fuel quantity.A set of capacitance probes in each tank to measure fuel level and temperature.The FCOM lists the sensors involved in this measurement: ( Airbus Safety First - Fuel monitoring on A320 Family aircraft) The translation of fuel volume into fuel weight is performed by the FQIC using the fuel density measured by specific devices in each wing tank Yet the information that is needed by pilots is the quantity of fuel on board expressed as a weight. This allows the determination of the fuel volume in the tank. The probes measure the level of the fuel in the tank, as a consequence of changing capacitance due to the amount the probe is immersed. The FQI system calculates the fuel quantity based on values taken from probes in the tanks. On the Airbus A320 family, the fuel volume is measured via capacitance probes and then converted to mass by also measuring the fuel density:
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