Final answer:
Yes, it is normal for a controller to inform a pilot when they are going to vector them across the final approach course, as it maintains situational awareness and ensures aircraft safety during approach.
Step-by-step explanation:
When a controller vectors an aircraft across the final approach course, it is normally expected for them to provide the pilot with information about the maneuver. The purpose of providing this information is to maintain situational awareness and ensure safe operation of the aircraft during the approach phase. Air traffic controllers typically issue clear and concise instructions, which includes vectoring information, to pilots for heading, altitude, and to prepare them for intercepting the final approach course. If a controller vectors an aircraft across the final approach course, they usually tell the pilot the reason for it, such as traffic or weather avoidance, sequencing, or other operational requirements.