Which condition necessitates checking a synthetic sling for UV damage?

The condition that necessitates checking a synthetic sling for UV damage is its use in sunlight. Synthetic slings, commonly made from materials like nylon or polyester, can degrade when exposed to ultraviolet (UV) radiation. Prolonged exposure to sunlight can cause the fibers to break down, reducing the sling's strength and potentially leading to failure during lifting operations.

It’s important for technicians to regularly inspect slings that have been used outdoors or in environments with significant sunlight exposure to ensure they remain safe for use. By recognizing the impact of UV rays, technicians can take appropriate actions, such as replacing or re-evaluating the integrity of the sling before use.

Other conditions such as extended storage, exposure to moisture, or heavy lifting do not inherently lead to the same risk of degradation caused by UV radiation. While these factors may also affect the sling's overall integrity, it is specifically the UV exposure during use in sunlight that demands careful inspection for damage.