What is used to tighten or loosen the tensioning wire on the BAK-15?

The lever chain hoist is the correct choice for tightening or loosening the tensioning wire on the BAK-15. A lever chain hoist operates using a simple lever mechanism that allows the user to apply a mechanical advantage to lift or adjust loads. This can be particularly effective in applications where space is limited or where a precise amount of tension needs to be applied without excessive effort.

In the context of the BAK-15, which is a type of arresting gear system primarily used on aircraft carriers, having a reliable method to adjust tension is critical for safety and performance. The lever chain hoist provides the necessary force multiplication, enabling personnel to effectively control tension on the wire.

Other options like a manual crank, pulley system, and winch mechanism are functional tools, but they do not provide the same efficiency or ease of use required for this specific application. A manual crank may require significant physical effort for larger tensions, the pulley system can assist in reducing friction but does not inherently provide a mechanical advantage in the same way a chain hoist does, and a winch mechanism, while potentially useful, might not be as direct or manageable in contexts demanding quick adjustments.