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Which RVR is controlling for landing?
touchdown RVR
The touchdown RVR data is required and controlling for all CAT II operations. Where installed, mid-point and rollout RVR VSs provide advisory visibility information to pilots. CAT II runways require associated RVR systems.
How is RVR determined?
Measurement. Originally RVR was measured by a person, either by viewing the runway lights from the top of a vehicle parked on the runway threshold, or by viewing special angled runway lights from a tower at one side of the runway. The number of lights visible could then be converted to a distance to give the RVR.
Why is RVR important?
The RVR (Runway Visual Range) is required to support precision landing and takeoff operations in the NAS . The system measures visibility, background luminance, and runway light intensity to determine the distance a pilot should be able to see down the runway.
How is RVR measured from the top of a car?
Originally RVR was measured by a person, either by viewing the runway lights from the top of a vehicle parked on the runway threshold, or by viewing special angled runway lights from a tower at one side of the runway.
How does RVR change as visibility gets lower?
The increments that RVR visibility is described in also changes as the visibility gets lower. The lower the visibility, the smaller the increments that RVR is reported: If visibility is less than the lowest reportable RVR value, an “M” is placed in front of it.
What should the RVR be on a 2000 m runway?
For example, a 2000 m runway could have reported touchdown, midpoint and rollout IRVR values of 700m, 400m and 900 m. If the actual RVR at the touchdown point (300 m from the threshold) is 700 m as reported, then a pilot could expect to see the light 700 m away, at the runway midpoint.
What does RVR stand for in nautical miles?
RVR is normally expressed in feet or meters. RVR is used to determine the landing and takeoff conditions for aircraft pilots, as well as the type of operational visual aids used at airport.