What must be ensured along with having a clear visor during night flights?

During night flights, having a clear visor is essential for optimal visibility, but it's also crucial to carry additional safety equipment. A flashlight provides necessary illumination to navigate and conduct pre-flight checks, while a reflective belt enhances visibility to others, particularly in low-light conditions. This combination ensures that pilots can see clearly and be seen by others, significantly reducing the risk of accidents during night operations.

The other choices may incorporate useful items, but they do not specifically address the critical need for both illumination and visibility enhancement during night flights. A navigational chart, while important for overall navigation, does not assist with visibility in the same way. A headset and communication device are vital for communication but do not contribute to the visual safety aspect needed when flying at night. Thus, the combination of a flashlight and reflective belt is the most appropriate choice for ensuring both visibility and safety.