Issue current touchdown RVR to departing aircraft for the runway in use when the prevailing visibility is ___ or less.

• A. 2 SM
• B. 3 SM
• C. 5 SM
• D. 1 SM

Answer: (D)

The key idea is that current touchdown RVR is given to departing aircraft when visibility is very low, so crews have a precise measure of what they’ll see at the runway’s threshold. Touchdown RVR specifically reflects the visibility in the touchdown zone, which can differ from the general prevailing visibility, and this detail is crucial for deciding if it’s safe to depart and what to expect during approach if they need to re-enter or land later.

The threshold here is 1 statute mile or less. When prevailing visibility drops to 1 SM or below, pilots benefit from knowing the exact TDZ visibility for the runway in use, not just the broader visibility figure. Providing the current touchdown RVR helps them assess safety margins for takeoff and any potential go-arounds, especially in deteriorating conditions.

Why the other numbers don’t fit as the required threshold: at visibility levels above 1 SM, the prevailing visibility already conveys the general conditions adequately for most departures, so broadcasting the touchdown RVR is not mandated. The policy focuses on ensuring crews have precise TDZ information when conditions are at or below the 1 SM level, where differences between overall visibility and touchdown-zone visibility become more impactful.