Aircraft comprising, in its fuel tank, a chamber provided with a sensor

An aircraft comprising:

• at least one engine,
• at least one fuel tank,
• a chamber which is located in the fuel tank, occupying only a part of the fuel tank and comprising at least one sensor for measuring a property of fuel in the fuel tank,
• an injection system configured to inject fuel into the engine, and
• an introduction line for introducing fuel from the injection system into the chamber, the introduction line comprising a valve capable of preventing an introduction of fuel from the injection system into the chamber via the introduction line,
• wherein the aircraft further comprises a memory, and at least one processor connected to the at least one sensor, the at least one processor being configured to determine density and mass flow rate of the fuel supplying the engine, by performing the following steps in order:
• measure a first density value, a first dielectric constant value and a first temperature value of the fuel in the chamber at a first time,
• measure a second density value, a second dielectric constant value and a second temperature value of the fuel in the chamber at a second time chosen so that the first temperature value and the second temperature value are different;
• based on the first density value, the first dielectric constant value, the first temperature value, the second density value, the second dielectric constant value and the second temperature value, determine parameters of at least one function for calculating a density from a temperature or from a dielectric constant;
• measure a volume flow rate value and at least one from among a third temperature value and a third dielectric constant value of the fuel in a fuel injection line into the engine;
• based on the at least one from among the third temperature value and the third dielectric constant value, and the at least one function, determine a density value of the fuel in the fuel injection line, and
• based on the volume flow rate value and the determined density value, determine a mass flow rate of the fuel in the fuel injection line.