ILS Category IIIC minima require which of the following?

• A. No DH and RVR not less than 150 ft
• B. No DH and RVR not less than 700 ft
• C. No DH and RVR not less than 1000 ft
• D. No DH and no RVR minimum

Answer: (D)

Category IIIC is defined as having no decision height and no RVR minimums. That means there is no fixed altitude at which you must decide to land, and no minimum runway visual range required to continue the approach. This makes IIIC largely theoretical and not used for standard operations, because there are no objective weather-based minima to rely on during the approach. Landing decisions would depend on the crew’s procedures and the ability to visually acquire the runway, rather than instrument minima. The other minima described correspond to other ILS categories, so they don’t apply to IIIC.