How many fuel probes does the fuel system use in total?

The correct answer indicates that the fuel system utilizes a total of seven fuel probes. In aircraft design, particularly in the context of fuel management systems, the number of fuel probes can vary depending on the specific requirements for monitoring fuel levels, distribution, and system redundancy.

Having seven fuel probes suggests a sophisticated system designed to provide accurate and reliable data about the fuel quantities in various tanks of the aircraft. This redundancy helps ensure that if one probe fails, others can still provide data, enhancing the overall safety and performance of the fuel management system.

In some systems, multiple probes may be positioned at different locations within the fuel tanks to give a comprehensive measurement of the fuel levels, considering the shifting fuel during flight maneuvers and all operating conditions. This complexity helps address various operational needs and ensures the aircraft operates within safe fuel margins.

Other options may suggest fewer probes, which might not adequately support the level of accuracy and reliability needed for the system's operations, especially in larger or more complex aircraft. The choice of seven reflects an optimal balance for functionality and safety within this context.