For crossfeed operations, what must be done with the standby fuel pump switch?

In crossfeed operations, the standby fuel pump switch must be off. This is necessary to prevent any unintended fuel flow that could interfere with the proper management of fuel during crossfeed. Crossfeed operations involve using fuel from one tank to supply another engine or system, and having the standby fuel pump on could cause pressure issues or fuel mismanagement between the tanks.

Properly managing the standby fuel pump ensures that the fuel flow remains stable and that the system works as intended without adding unnecessary complications. This practice aligns with safety protocols in fuel management, ensuring the aircraft can operate effectively and efficiently during crossfeed scenarios.