What color is the lettering on ILS Critical Area Boundary marking signs?

The lettering on ILS Critical Area Boundary marking signs is white on a black background. This color combination is specific to enhance visibility and ensure that the signs are easily readable in various environmental conditions commonly found at airports. The use of black for the background provides strong contrast against the white lettering, making important information stand out for pilots and ground crews.

Understanding this marking is crucial for maintaining operational safety, especially during instrument flight rules (IFR) operations. The clear visibility helps prevent unauthorized access to critical areas where aircraft may be landing or taking off, thereby contributing to effective air traffic management and safety protocols.