Why is RVR especially important for landing aircraft?

RVR, or Runway Visual Range, is a crucial metric that directly relates to the visual conditions that pilots experience when approaching to land. This measurement provides the distance a pilot can clearly see down the runway, which is essential for determining whether it is safe to land. In reduced visibility situations, such as fog, rain, or snow, RVR helps inform pilots about the prevailing conditions and assists in making critical decisions regarding approach and landing.

A lack of adequate RVR makes it challenging for pilots to maintain proper visual references necessary for a safe landing, especially during approaches that rely heavily on visual cues. If the RVR is below minimum requirements, aircraft may be unable to land safely, necessitating a diversion to an alternate airport. Thus, monitoring RVR is vital for ensuring that pilots have the necessary visual conditions to complete their landings safely and effectively.