When converting RVR to PV for a straight-in approach, what is the correct procedure according to the guidelines?

When converting Runway Visual Range (RVR) to present visibility (PV) for a straight-in approach, utilizing the lower value without interpolation is the correct procedure. This approach ensures that pilots are operating with a conservative estimate of visibility, which is critical for safety during critical phases of flight such as landing.

The rationale behind choosing the lower value is grounded in the need to maintain a safety margin. In situations where visibility is a determining factor for landing, relying on the higher value of visibility could pose unnecessary risks. By using the lower value, pilots can ensure that they are making decisions based on the worst-case scenario, which aligns with safety protocols in aviation.

In contrast, other options such as averaging both values or rounding up could potentially lead to overestimating visibility, and using the higher value fails to adhere to the conservative approach necessary in aviation decision-making processes. Avoiding interpolation further reduces complexity and keeps the pilot’s focus clear, allowing for straightforward calculations based on the most reliable data available.