Which technique is essential for ensuring accurate fuel quantity readings in multi-tank configurations?

Utilizing a proportional capacitance system is essential for ensuring accurate fuel quantity readings in multi-tank configurations due to the way it measures the volume of fuel in each tank. This system operates on the principle that the capacitance of a sensor changes based on the amount of liquid surrounding it. As the fuel level changes, the capacitance varies proportionally, allowing for accurate measurement of the fuel quantity in each tank.

In multi-tank systems, where different tanks may have varying shapes and sizes, a proportional capacitance system can provide precise readings by accounting for these differences. This leads to better fuel management, improved safety, and more effective planning for fuel needs during flight.

In contrast, relying on a single gauge for all tanks would not provide the necessary specific information regarding each tank's contents, as it could only indicate an average level across all tanks. The use of variable resistors may introduce inaccuracies due to changes in temperature and fuel properties, while implementing a secondary manual gauge, while potentially useful as a backup, does not enhance the real-time accuracy of the primary fuel measurement system.