What is a limitation regarding Copter night time operations?

The correct answer highlights a specific limitation during nighttime operations for helicopters, particularly regarding their capability to hover-fill. Hover-filling is a technique where a helicopter takes on water while remaining airborne, which is more difficult to achieve at night due to lower visibility and the heightened risks associated with reduced depth perception. During nighttime, pilots may face challenges in accurately gauging their altitude and position, making hover-filling a complicated maneuver that is best avoided to ensure safety and operational effectiveness.

This process's intricacies could arise from limitations in lighting conditions and the need for precise control, which can be compromised at night. Therefore, it's crucial for pilots to adjust their methods and operational approaches to align with these limitations, prioritizing safety and efficiency during evening and nighttime missions.