What additional equipment is required for VFR night flight?

When conducting VFR (Visual Flight Rules) night flight, the helicopter must be equipped with position lights. Position lights, also known as navigation lights, are crucial for enhancing the visibility of the aircraft to other pilots during nighttime operations. These lights indicate the aircraft's orientation and direction by displaying red lights on the left side, green lights on the right side, and a white light at the tail. This is especially important for safety, as it allows pilots to see each other in the dark and avoid mid-air collisions.

The other equipment mentioned in the choices, while important in various contexts, does not specifically fulfill the requirement for VFR night flight. For instance, a flight data recorder is not mandatory for VFR operations and is more relevant to larger commercial aircraft. A safety harness system is important for passenger safety but is not a legal requirement specifically for night VFR flight. Lastly, a flight manual, although necessary for operational guidance, does not qualify as additional equipment needed for VFR operations at night. Thus, position lights are the specific requirement for ensuring safe navigation and compliance with regulations during nighttime flying.