Runway visual range (RVR) is a highly accurate instrument-derived visibility measurement that represents the range at which the runway’s high-intensity lights can be seen in the direction of landing along the runway. Its readings are transmitted to the air traffic controller, who informs the pilot. RVR is used, when available, as a visibility minimum for low-visibility precision approach landings in preference to the general visibility measurement, which also may be reported. RVR values are measured at three points along the runway:
1. Touchdown point
How is RVR reported?
Runway visual range (RVR) is reported at up to three points on the runway:
1. At the touchdown zone
2. At the midpoint
3. At the stop end whenever it is detected as being less than 1500 m.
Midpoint and stop-end values are only reported if they are less than the touchdown zone and less than 800 m or if they are less 400 m. When all three values are given, the names are omitted.
RVR is measured in steps of 25 m up to 200 m, in steps of 50 m up to 800 m, and thereafter in steps of 100 m.
Note: The runway designator may follow the quoted RVR; e.g., RVR 300/25 means RVR 300 m on runway 25.