Under what condition cannot number 1 initiate a lead change?

Number 1 cannot initiate a lead change if number 2 is in an unsafe position or cannot maintain visual contact. This condition is critical for the safety and effectiveness of formation flying. Maintaining visual contact is essential for coordination between the aircraft; without it, the lead would not be able to ensure the safety and positioning of number 2 during the maneuver. If number 2 is not in a position where both pilots can see each other, there is a high risk of collision or miscommunication, which could compromise the integrity of the formation.

The safety of the formation is paramount, and a lead change initiated under these circumstances could lead to disorganization and potential accidents. Therefore, number 1 must assess the situation carefully and ensure that number 2 is in a safe and appropriate position to proceed with the lead change.