How many feet is the minimum distance required for a Cat I aircraft departing behind a Cat III on the same runway?

• A. 3000 feet
• B. 6000 feet
• C. 9000 feet
• D. 12000 feet

Answer: (B)

The minimum distance required for a Cat I aircraft departing behind a Cat III on the same runway is 6,000 feet. This requirement is based on safety regulations that account for the different performance characteristics and takeoff profiles of these aircraft categories.

Cat III aircraft are capable of operating in low visibility conditions and typically have a higher speed during the initial climb phase, which means they require more distance for takeoff and initial climb compared to Cat I aircraft. The 6,000-foot separation helps ensure that the wake turbulence and potential downdrafts generated by the Cat III aircraft do not adversely affect the Cat I aircraft's departure.

This standard distance is established to maintain safe operational practices and to prevent incidents related to wake turbulence, which can significantly affect the performance of lighter aircraft if they are too close behind a heavier aircraft on takeoff. Thus, the correct answer reflects the necessary safety margin that must be maintained in these operations.