ILS Category IIIB minima specify which conditions?

• A. No DH and RVR not less than 150 ft
• B. No DH and RVR not less than 700 ft
• C. HD 100 ft; RVR 1200 ft
• D. No DH and No RVR minimum

Answer: (A)

ILS Category IIIB minima remove the requirement for a decision height and instead set a minimum Runway Visual Range that must be met to continue and complete the landing. In IIIB, there is no DH to reference—the pilot makes the landing decision based on the instrument indications and the runway visibility as provided by the RVR. The minimum RVR for this category is 150 feet, so as long as the RVR is at least that value and the necessary precision approach equipment and lighting are in use, a landing may be conducted.

This differs from other categories: some require a decision height (a fixed altitude) with a higher RVR, and one category describes operations with no DH and no RVR minimum (the most restrictive, IIIC). So the statement that matches IIIB is no decision height and an RVR minimum of 150 feet.