How is the position of number 2 primarily determined during a formation approach?

The correct choice involves maintaining a set distance from number 1 as the primary method for determining the position of number 2 during a formation approach. In formation flying, especially during critical maneuvers such as landing approaches, it is essential for the formation to maintain a precise configuration. Number 2 must keep a consistent distance from number 1 to ensure the integrity of the formation and facilitate safe operation.

This set distance allows number 2 to effectively manage their own speed and approach while allowing for adaptations based on number 1's movements. Maintaining this spacing is crucial for safety and to reduce the risk of collisions or wake turbulence. It also helps to ensure that number 2 can react appropriately to any changes in the flight path or speed of number 1.

Other methods, such as references to ground objects or altitude control, provide situational awareness and assist in the overall operation but are secondary to the key factor of maintaining that specific distance in formation flying. Consequently, relying on the distance between the aircraft best ensures that the formation remains stable and cohesive during such approaches.