Which option correctly states the minima for an ILS Category I approach?

• A. Height above touchdown not less than 100 ft; RVR not less than 1,200 ft
• B. Height above touchdown not less than 200 ft; RVR not less than 1,800 ft
• C. Height above touchdown not less than 50 ft; RVR not less than 800 ft
• D. Height above touchdown not less than 10 ft; RVR not less than 100 ft

Answer: (B)

ILS Category I minima define the least altitude above the touchdown zone at which a decision to land must be made and the minimum Runway Visual Range required to continue the approach. For Category I, you must not descend below a height of 200 feet above the TDZE, and you must have at least 1,800 feet of Runway Visual Range. This pairing ensures the pilot has enough visual information and runway cues to safely complete the landing or execute a missed approach if the runway environment isn’t visible.

Understanding this helps distinguish Category I from higher categories, where the decision height and visibility requirements become more permissive (lower DH and lower RVR) as the approach category increases.