Features August 2015 Issue
RVR is not Visibility
The FAA helps us confuse runway visual range (RVR) with flight visibility, but they’re different concepts. RVR is an instrumentally-derived value at a runway. Flight visibility is a pilot-observed distance in flight. Regulation §91.175 is clear—flight visibility is required to descend below DA/MDA. Yet, approach charts confusingly equate the two by providing both RVR and visibility values.