RVR is not Visibility

The FAA helps us confuse runway visual range (RVR) with flight visibility, but theyre 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.

Key Takeaways:

• Runway Visual Range (RVR) and flight visibility are distinct concepts; RVR is an instrumentally-derived value specific to a runway, while flight visibility is a pilot-observed distance from the cockpit.
• FAA regulations require flight visibility for descending below decision altitude/minimum descent altitude, yet approach charts and FAA guidance often confusingly equate RVR with flight visibility.
• The FAA also provides mathematically inconsistent conversions between RVR values (feet) and miles, adding to the confusion regarding required visibility for landing.

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