When helicopters encounter a slope of 15 degrees or more, what must they do?

In situations where helicopters encounter a slope of 15 degrees or more, terminating at hover is crucial for ensuring safety. This action allows the pilot to assess the conditions more thoroughly and make informed decisions regarding the landing.

When a helicopter hovers, it provides an opportunity to evaluate the landing area for obstacles, wind conditions, and the overall stability of the helicopter in relation to the slope. Landing on steep slopes can be risky because of the potential for loss of control during touchdown or while maneuvering on uneven terrain. By choosing to hover, the pilot can maintain control and determine the best course of action, whether that involves moving to a different location for landing on flat ground or even choosing to continue in flight if conditions are not suitable for a safe landing.