Under what condition is the RVRNO reported when RVR equipment is inoperative?

Under what condition is the RVRNO reported when RVR equipment is inoperative?

• A. When visibility is greater than 3 miles
• B. When visibility is less than or equal to 1 mile
• C. When wind data is missing
• D. When cloud height data is unavailable

Answer: (B)

RVRNO is used to flag that Runway Visual Range data cannot be observed because the RVR equipment is out of service. This indicator is specifically applied when the prevailing visibility is 1 mile or less, highlighting that, in poor visibility, having no RVR measurement could mislead unless it’s explicitly stated that RVR is not observed. The issue isn’t about wind or cloud data; those elements don’t determine whether RVR can be reported. When visibility is better than 1 mile, the absence of an RVR observation is less critical, so RVRNO isn’t applied.

RVRNO is used to flag that Runway Visual Range data cannot be observed because the RVR equipment is out of service. This indicator is specifically applied when the prevailing visibility is 1 mile or less, highlighting that, in poor visibility, having no RVR measurement could mislead unless it’s explicitly stated that RVR is not observed. The issue isn’t about wind or cloud data; those elements don’t determine whether RVR can be reported. When visibility is better than 1 mile, the absence of an RVR observation is less critical, so RVRNO isn’t applied.