A crane operator is using a two-part reeving system. After completing a lift, the operator slowly lowers the block without a load. While doing so, the hoist limit switch activates repeatedly, and the block occasionally bumps against the boom tip. What immediate action should the operator take and why?

Question: A crane operator is using a two-part reeving system. After completing a lift, the operator slowly lowers the block without a load. While doing so, the hoist limit switch activates repeatedly, and the block occasionally bumps against the boom tip. What immediate action should the operator take and why?

Answer options:

• Continue lowering slowly, as it's just the empty block.
• Increase engine RPM to speed up the descent and clear the switch. ✅ Stop lowering, identify the cause of limit switch activation, and inspect for two-blocking risk.
• Engage the boom auxiliary hoist to create more clearance.

Correct answer: Stop lowering, identify the cause of limit switch activation, and inspect for two-blocking risk.

Explanation: Repeated limit switch activation and bumping indicate a high risk of catastrophic two-blocking. The operator must immediately stop, investigate the reason for the switch activation, and ensure there is adequate distance between the block and boom tip to prevent damage.