The precise method for testing the functionality of an anti-two-block (ATB) device on a crane involves simulating a two-block condition and verifying that the ATB system prevents further hoisting. Two-blocking occurs when the hook block (the block containing the hook) comes into contact with the boom tip (or jib tip), potentially damaging the wire rope, crane, or load. The ATB device is designed to prevent this. The test should be performed with no load on the hook. With the crane in a safe configuration, slowly hoist the ho....
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