What SRS is required between subsequent arrivals when at least one of the aircraft on approach to land is a CAT III?

• A. 1,000 ft separation
• B. No special requirement
• C. Runway centerline offset of 500 ft
• D. Clear of runway

Answer: (D)

When a CAT III (low-visibility) approach is in progress, the safety emphasis is on making sure the landing environment is unambiguous and free of conflicting traffic. The SRS between successive arrivals is that the runway must be clear before the next aircraft is cleared to land. This means no aircraft or vehicles on the runway or in the rollout area of the previous landing. The high precision and limited visibility of CAT III operations require this extra caution to prevent any overlap or confusion on the runway in case of a go-around or other adjustments.

The other options don’t fit because they imply a specific numeric spacing or a condition that doesn’t address the need to avoid runway occupancy conflicts in low-visibility landings; CAT III operations demand ensuring the runway is completely clear rather than applying a fixed, less protective separation.