What should be the primary means of communication with number 2 in the route position?

The primary means of communication with number 2 in the route position should be through radio communications. This method is the most effective and reliable for maintaining situational awareness, coordinating maneuvers, and conveying critical information during flight, especially in formation flying where precision and timely communication are essential.

Using the radio allows for clear and immediate exchanges of information, such as intentions, problem reporting, and positions, which can significantly enhance safety and performance in formation. Pilots are trained to use specific communication protocols and frequencies to ensure all members of the formation are aware of each other's actions, which is crucial for maintaining proper spacing and alignment in the formation.

While light signals, visual cues, and hand signals can be effective in certain scenarios, they often lack the immediacy and clarity that radio communication provides, especially under varying flight conditions or in noisy environments. Therefore, prioritizing radio communications aligns with best practices for formation flying.