What should RVR minimums specified in an IAP be converted to if RVR is inoperative?

When the Runway Visual Range (RVR) is reported as inoperative, the appropriate conversion for RVR minimums specified in an Instrument Approach Procedure (IAP) is to use ground visibility. This is because ground visibility is an alternative measure of visibility available at the airport, which can serve to inform whether a pilot can safely conduct an approach and landing.

This conversion is important because RVR is often used in low visibility conditions to provide a reliable measure of how far a pilot can see down the runway. When RVR is inoperative, ground visibility becomes critical for maintaining safety and ensuring compliance with approach requirements.

Other options do not serve as valid replacements for RVR minimums in a situation where RVR is inoperative. Flight visibility, for instance, refers to what a pilot can see from the cockpit during flight and may not accurately represent the conditions on the runway itself. Visual Flight Rules pertains to a broader set of regulations governing operations in visual meteorological conditions and does not directly address the conversion of visibility measures for instrument approaches. Approach minimums establish the lowest acceptable altitudes and visibility for conducting approaches but do not specifically address the conversion of visibility from RVR when it is inoperative.