When published RVR values fall between those on an RVR conversion table, how should the PIC determine the minimum required?

The process of determining the minimum required Runway Visual Range (RVR) when published values fall in between those listed on an RVR conversion table relies on safety and regulatory guidance. Rounding up to the next highest RVR value ensures that the aircraft is operating under conditions that meet or exceed the regulatory minimums. This practice contributes to maintaining a standardized margin of safety during operations, especially in low visibility conditions where precision is crucial for safe landings and takeoffs.

Using the next highest value accommodates the potential for variations in visibility that could occur in a realistic operating environment. It safeguards against the possibility that an interpolating or averaging approach might underestimate the actual RVR, leading to potential safety risks. Additionally, aviation regulations and practices typically advocate for taking the more conservative approach in order to enhance safety margins during critical phases of flight, particularly in instrument conditions. This aligns with the objectives of effective flight operations, ensuring that all relevant safety considerations are prioritized.