How does one know that the Boost Pumps have turned off?

The correct response involves understanding the operation of boost pumps in relation to engine start procedures. Boost pumps are designed to facilitate fuel flow during engine start. Once the engine starts successfully, the system recognizes that adequate fuel pressure is being generated by the engine-driven fuel pumps, signaling that the boost pumps are no longer necessary. Consequently, they are automatically turned off after engine start is completed.

This not only ensures that the fuel system operates efficiently but also helps prevent fuel overflow or pressure issues as engine-driven pumps take over. While the visual fuel level indicator shows fuel levels and may provide insights into fuel consumption, it does not directly indicate the operational status of the boost pumps. Similarly, while fuel weight may have implications for performance calculations, it does not tie into the function of the boost pumps being turned off. Automatic shutdown of the boost pumps after landing is also not a standard practice; their operation is specifically tied to the starting phase of the engines.