When either aircraft is a Cat III, what must the first aircraft be in relation to the runway?

• A. On the Taxiway
• B. Clear of the Runway
• C. Taxiing to the Runway
• D. At the Hold Short Line

Answer: (B)

When one of the aircraft involved in an operation is a Category III (Cat III) aircraft, the critical factor for the first aircraft is that it must be clear of the runway. Category III operations involve low visibility approaches and landings, which means that the aircraft is relying heavily on instrument guidance to navigate safely. Ensuring that the first aircraft is completely clear of the runway helps to facilitate the smooth and safe operations of the Cat III aircraft, which may require precise spacing and timing due to its potential for operating in very low visibility conditions.

In this context, if the first aircraft were not clear of the runway, it could create a hazardous situation, increasing the risk of collision or other complications during the landing process of the Cat III aircraft. Meeting this requirement ensures a safe distance between the aircraft and maintains operational integrity during critical phases of flight.