What must be ensured regarding the hoisting cable and trail lines at all times?

In the context of operating with hoisting cables and trail lines, ensuring they are secured at all times is crucial for safety and operational integrity. A secured line prevents accidental release or entanglement, which could pose risks to crew members and equipment during operations.

When lines are not properly secured, they can become a hazard, leading to injuries or equipment damage during maneuvers such as hoisting people or equipment. Securing these lines ensures they remain under control and minimizes the chances of creating a chaotic or dangerous situation.

While there are other important considerations, such as visibility and proper storage, the primary focus on security ensures that the lines function effectively and safely during operations.