What would first occur in the fuel flow sequence after passing through the filter?

After fuel passes through the filter, it is directed to the Fuel Control Unit (FCU). The FCU's primary function is to regulate the flow of fuel to the engine based on various operating parameters, such as power demands and engine conditions.

This step is crucial because the FCU determines the appropriate amount of fuel needed to match the aircraft's performance requirements at any given moment. It ensures the correct mixture of fuel and airflow for optimal combustion and engine efficiency.

Following the FCU, the fuel would then proceed to the other components in the fuel flow sequence, including the Fuel Flow Transducer, which measures the volume of fuel flowing to the engine. The answer signifies the critical role of the FCU in managing fuel flow and supporting engine function.