Which method involves flying in separate sectors during a rotary-wing attack?

The correct choice involves the sectored attack method, which is characterized by rotary-wing aircraft operating in designated separate sectors during an attack. This approach allows for the coordinated use of multiple helicopters while minimizing the risk of friendly fire and maximizing the efficiency of the assault.

By partitioning the area into distinct sectors, each aircraft can focus on specific targets without overlapping with others, thereby enhancing target acquisition and control of the battlefield. This method also facilitates effective communication among the aircraft, as they know their designated areas of responsibility, which helps in managing the overall airspace and maintaining situational awareness.

In contrast, other methods like combined attack or intrusion attack typically involve different operational dynamics where aircraft may not operate strictly within assigned sectors. Reinforced attack can involve supporting units or additional forces but does not specifically relate to the separation of air operations as seen in a sectored attack. Understanding these nuances is critical for effective execution during rotary-wing operations in combat scenarios.