Runway Visual Range (RVR) is the horizontal distance a pilot will see down the runway from the approach end. It is an instrumentally derived value, representing the visual range over the runway’s surface as assessed from a specific location. This measurement is crucial for pilots making landing decisions under low visibility conditions. For example, if a pilot is approaching a runway with an RVR reading of 1600 feet, it indicates that the pilot can expect to see runway markings, lights, or other visual aids for at least 1600 feet along the runway.
The accurate reporting of this measurement is vital for flight safety. It allows pilots to determine if the visibility meets the minimum requirements specified for the approach being flown. This information ensures that pilots can safely land the aircraft. The implementation of these systems represents a significant advancement in aviation safety, particularly for operations conducted in adverse weather. It provides a more objective and reliable assessment of visibility compared to previous subjective estimations.