At what point would you switch to the I-BAD localizer frequency when approaching Elm Grove VORTAC?

Switching to the I-BAD localizer frequency when turning inbound to the 329 course is strategically sound because this is typically when pilots begin the final approach segment of an instrument landing system (ILS). By tuning in the localizer frequency at this point, pilots ensure that they are aligned with the localizer signal, which provides guidance for the final approach to the runway.

At this moment in the approach, the aircraft is effectively transitioning from the en-route phase to the approach phase, and tuning to the localizer allows pilots to focus on aligning with the runway while managing altitude and other approach parameters. This timing also helps establish a seamless transition to the ILS procedure, allowing for a more efficient and controlled descent path.

In this context, switching frequencies before or after this point might introduce unnecessary complications. For instance, switching immediately upon leaving the holding pattern or starting the descent could lead to confusion or mismanagement of navigation since the aircraft might still be in the en-route phase. Switching after passing the VORTAC would delay the establishment of localizer guidance, potentially resulting in an inefficient approach. Thus, making the switch as you turn inbound to the course aligns with standard operating procedures and enhances approach safety and efficiency.