In a wire rope sling, which term refers to the condition where strands spread apart, resembling a birdcage?

• A. Birdcaging
• B. Kinking
• C. Crushing
• D. Heat damage

Answer: (A)

Birdcaging is the condition where the strands of a wire rope sling spread apart and separate, giving a birdcage-like appearance. This happens when the rope has been subjected to severe bending or internal damage that lets the wires push outward under load. It’s a clear sign the rope’s integrity is compromised, making it unsafe to use because the load-bearing structure isn’t uniform anymore. The other terms describe different damage modes: a sharp bend or twist that causes a kink, crushing from being pressed against a hard surface, and heat damage from excessive friction or overheating. Recognizing birdcaging helps you quickly identify a rope that has internal strand separation and should be taken out of service.