Which flight condition requires an aircraft to have an anticollision light system during nighttime operations?

The requirement for an anticollision light system during nighttime operations is particularly essential during VFR (Visual Flight Rules) nighttime flights. This is because VFR nighttime operations usually involve flying in conditions where visual references are limited, making it crucial for other aircraft to see and identify your aircraft. The anticollision lights enhance visibility, thereby reducing the risk of mid-air collisions in the night sky when other references are not as prominent.

In the context of flight regulations, the use of anticollision lights is mandated to ensure that an aircraft is discernible to others, especially at night when visibility is significantly lower. This enhances safety by alerting other pilots to the position and movement of your aircraft. Therefore, for VFR nighttime flights, having an operational anticollision light system is not just a precaution but a regulatory requirement to promote safety in the skies.