Runway Visual Range (RVR)

Runway Visual Range (RVR) is an instrumentally derived value that represents the maximum distance over which a pilot of an aircraft on the centreline of the runway can see runway surface markings or runway lighting that delineate the runway or identify its centreline. RVR is the most operationally relevant visibility measure for low-visibility approaches.

How RVR Is Measured

RVR is measured by transmissometers positioned at the touchdown zone, mid-field, and rollout zones of instrument runways. Values are typically reported in feet or metres and updated at least once per minute. RVR values below approximately 1,200 ft are the most operationally critical — below 600 ft, even CAT IIIb procedures may not permit landing.

RVR in Approach Minimums

CAT I ILS: 1,800 ft RVR. CAT II: 1,200 ft. CAT IIIa: 700 ft. CAT IIIb: 150 ft. RVR replaces visibility in SM as the reference value for these approaches because it is more precise and location-specific.

Related Terms

See also: Visibility, ILS, Decision Height.