BACK TO CATEGORIES Photo ID: 879 (Click photo to view original size.) Category: Construction Hazard: Caught between falling boom and ground. Standard Violated: ANSI B30.5-1968 for truck cranes Corrective Action: Block or crib boom during disassembly. Description: Two people were attempting to remove the upper stage of a lattice boom truck crane. They failed to crib (block the) the base section. When the two lower pins were driven out, the boom fell, crushing one worker.