1926.1400 assembly of a crane boom requires which competent person?

• A. Qualified rigger
• B. AD director
• C. Crane operator
• D. Site supervisor

Answer: (B)

The key idea is that assembling a crane boom is a rigging task that must be overseen by someone who is competent in rigging and assembly operations. This person needs to understand the equipment, the loads, and how the pieces fit together, and they must have the authority to stop work if a hazard is found.

A qualified rigger is the best fit because rigging is central to the boom assembly process. A qualified rigger has training and experience in selecting and inspecting rigging gear, directing lifts, understanding load paths, and communicating clearly with the crane operator and spotters. They can verify that all pins, pins retainers, hydraulic connections, and alignment requirements are correct, and they can manage the rigging plan throughout the assembly to keep workers safe.

The crane operator focuses on operating the crane itself, not the rigging plan or the step-by-step safety checks for assembly. A site supervisor oversees overall safety on the job, but may not have the specialized rigging expertise needed for boom assembly. An undefined role like an “AD director” isn’t a recognized credential for this task. For safe assembly, the competent person should be a qualified rigger who can supervise the rigging and assembly process with authority to halt work if anything appears unsafe.