What does a full scale deflection represent in terms of LOC deviation?

A full scale deflection in the context of LOC (Localizer) deviation represents a significant amount of deviation from the centerline of the runway, indicating a lack of precise alignment with the intended flight path. Typically, it is understood within aviation that a full scale deflection corresponds to a deviation of 2 ½° or more from the center of the localizer signal.

When analyzing the concept of full scale defection, it’s important to recognize that this greater than 2 ½° deviation suggests that the aircraft is not on the correct approach path, which is crucial for safe navigation during landing. This measure ensures pilots are aware of how far off they are from the optimal landing trajectory, allowing them to take appropriate corrective actions. Understanding this concept is vital for maintaining situational awareness and ensuring successful landings while adhering to procedural guidelines.