When rejoining on an interval takeoff, when does number 2 delay turning crosswind?

The correct answer is that number 2 delays turning crosswind at 140 KIAS and 400 feet AGL. This procedure is important in formation flying during an interval takeoff to ensure that the aircraft maintain safe spacing and avoid any potential conflicts during the initial climb phase.

At 140 KIAS and 400 feet AGL, the pilot has reached a safe enough altitude and airspeed that allows them to maintain controlled flight while ensuring sufficient separation from the lead aircraft. This timing is critical because if number 2 were to turn crosswind too early, there could be a risk of encroaching on the lead's flight path, which can lead to potential wake turbulence encounters or loss of formation integrity.

Maintaining this delay in the turn helps establish a proper distance from the lead aircraft, allowing both pilots to safely continue their climb and establish their respective flight paths. This technique is a key part of the formation flying syllabus, emphasizing teamwork and situational awareness during the critical phases of flight right after takeoff.