Which option correctly describes ILS Category IIIA minima?

• A. Height above touchdown not less than 100 ft; RVR not less than 1,200 ft
• B. No decision height minimum and RVR not less than 700 ft
• C. No decision height minimum and RVR not less than 1,000 ft
• D. Height above touchdown not less than 200 ft; RVR not less than 1,800 ft

Answer: (B)

ILS Category IIIA minima are designed for very low visibility and mean there is no fixed decision height to land. In this category, the pilot does not rely on a DH to decide to land; instead, the approach can be continued as long as the runway environment is or becomes visible or the aircraft’s autoland capability is engaged, within the minimum visibility limits. The required visibility is an RVR of at least 700 feet (about 200 meters), which is the threshold that makes a landing permissible under IIIA.

This differs from Category II minima, which require a decision height around 100 feet and an RVR of about 1,200 feet, and from options that propose a specific height or higher RVR. The 700-foot RVR figure is the defining minimum for Category IIIA, aligning with the no-decision-height concept.