An operator performing a monthly rigging inspection notes that a wire rope sling has general corrosion causing noticeable pitting over a significant length. The sling's wires are still intact, but the flexibility and diameter appear reduced. What is the appropriate next step according to good practice and CSA Z150?

Question: An operator performing a monthly rigging inspection notes that a wire rope sling has general corrosion causing noticeable pitting over a significant length. The sling's wires are still intact, but the flexibility and diameter appear reduced. What is the appropriate next step according to good practice and CSA Z150?

Answer options:

• Clean the sling and apply lubricant to prevent further corrosion.
• Reduce the sling's WLL by 25% and mark it for limited use.
• De-rate the sling according to the extent of material loss and continue use. ✅ Remove the sling from service and have it professionally inspected or discarded.

Correct answer: Remove the sling from service and have it professionally inspected or discarded.

Explanation: Pitting from corrosion, even without obvious broken wires, indicates a loss of metal area and could significantly reduce strength and flexibility. CSA Z150 requires prompt removal from service for such deterioration, prior to competent person assessment or disposal.