If a runway surface is contaminated, what must be ensured about the approach equipment?

When a runway surface is contaminated, it is crucial to ensure that the approach equipment includes both the Localizer (LOC) and the Glide Slope (GS) with the Outer Marker (OM). This combination provides pilots with critical navigational guidance that is especially important during the landing phase when the runway conditions may be less than ideal.

The Localizer helps to align the aircraft with the runway centerline, while the Glide Slope assists in maintaining the appropriate descent path to the runway. The inclusion of the Outer Marker further enhances situational awareness by indicating when the aircraft is approaching the decision point for the approach, allowing for a better assessment of the runway environment.

Having this type of equipment is vital in maintaining safety and ensuring that pilots have the proper aids to execute a stable and controlled approach, especially on a contaminated surface where stopping distance may be affected and the risk of landing errors might be heightened.