Which of the following statements is true about the limits when both RVR A and B are available?

• A. 1200 RVR
• B. No restrictions
• C. 1200/600 RVR
• D. 1200/600 RVR, 200' DA

Answer: (C)

When two RVR readings are available, the published minima specify two separate requirements corresponding to the two sensors on the runway. The A sensor (often in the touchdown/approach zone) and the B sensor (usually another location along the runway) each impose their own minimum visibility. Because both sensors are in play, the approach minima are expressed as a pair, showing the minimum RVR for each sensor location. In this case, the required values are 1200 for the A sensor and 600 for the B sensor, written as 1200/600 RVR. This means you must have at least 1200 RVR at the A location and at least 600 RVR at the B location to be authorized to land under those minima.

The other options don’t fit because a single value doesn’t account for both sensors, “No restrictions” isn’t correct when RVR sensors are installed, and adding a DA figure isn’t part of the RVR limit description.