How can a pilot determine if they may penetrate the obstacle identification surfaces (OIS) for an ILS runway equipped with MALSR?

A pilot can determine if they may penetrate the obstacle identification surfaces (OIS) for an ILS runway equipped with Medium Intensity Approach Lighting with Sequenced Flashing Lights (MALSR) by considering the published visibility for the ILS. Specifically, the regulation dictates that if the visibility is no lower than 3/4 statute miles, then penetration of the OIS is permitted.

This requirement ensures that pilots have adequate visual references during the approach phase, thereby enhancing safety, particularly when maneuvering around potential obstacles. The use of MALSR aids in providing visual guidance, and the associated visibility minimum allows for some level of flexibility for pilots when they assess their situation upon approach. This means that if the weather conditions meet or exceed this visibility minimum, the pilot can conduct the approach with reduced concern about obstacles in the path.

The other considerations, while important in their own contexts, do not specifically relate to the criteria for OIS penetrations. Understanding this aspect of approach minimums is crucial for ensuring a safe and compliant descent during instrument approaches.