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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Aircraft General Knowledge - Instrumentation > A capacitance fuel-quantity system with appropriate fuel-density compensation and calibration can indicate fuel mass in kilograms or pounds because:

150 - ATPL Question Bank in English - A capacitance fuel-quantity system with appropriate fuel-density compensation and calibration can indicate fuel mass in kilograms or pounds because:

Question 150 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot Licence

Fuel and air have identical dielectric properties, so probe capacitance never changes with fuel level

The fuel dielectric constant is inversely proportional to density for every fuel, without any calibration

Probe capacitance changes as fuel replaces air between the electrodes, and compensation accounts for fuel-density and dielectric-property variations

Fuel density and temperature can never affect the probe capacitance or the mass indication

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