What should number 1 do after number 2 calls "visual" during Lost Wingman procedures?

When number 2 calls "visual" during Lost Wingman procedures, it indicates that they have regained visual contact with number 1. In this situation, the appropriate response for number 1 is to initiate rejoin maneuvers. This involves number 1 taking action to allow number 2 to safely return to the formation position, ensuring that safety and proper formation flying are maintained.

Initiating a rejoin helps to quickly restore the integrity of the formation and allows both aircraft to operate safely together. When number 1 begins the rejoin, it typically involves maintaining an appropriate speed and altitude to facilitate number 2's approach. This response is crucial in transitioning from a potentially disorganized state back to a coordinated flying condition.

Engaging the autopilot, accelerating for separation, or turning off navigation lights do not directly address the situation of re-establishing the formation and could lead to confusion or an unsafe flying environment. Thus, beginning the rejoin after receiving the "visual" call is the most effective and safe action for number 1.