What type of problems could a pilot encounter if the localizer misalignment is over 3 degrees?

When the localizer misalignment exceeds 3 degrees, a pilot may experience significant difficulty in maintaining the established course in an ILS (Instrument Landing System) approach. The localizer radiates signals that guide the aircraft horizontally towards the runway centerline. If this deviation is greater than 3 degrees, the aircraft may fly off course, leading to erratic navigation and potentially causing the pilot to overcorrect or struggle to keep the aircraft aligned with the intended glide path.

In such circumstances, the pilot may also find it challenging to interpret the instrumentation correctly as the localizer indications could become unreliable. This misalignment could result in increased workload and distraction, making it harder to focus on other critical aspects of the approach, such as altitude, airspeed, and configuration.

While other options mention potential issues like inaccurate approach intervention and increased fuel consumption, these are secondary consequences stemming from the primary problem of maintaining course. Without precise tracking of the localizer, the likelihood of missing the intended runway increases, which ultimately makes the course maintenance issue the most direct and pressing problem to address.