National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

Staying out from under the boom while removing pins or bolts from a boom assembly is crucial for ensuring worker safety. The boom can be subject to shifting or unexpected movement, especially if the crane is not properly secured or if there are any mechanical issues. Being positioned underneath the boom increases the risk of injury from potential falls or other hazards that could occur if the assembly were to move unexpectedly. By maintaining a safe distance and remaining out from under the boom, workers minimize their risk of injury and create a safer working environment. This precaution aligns with safety protocols that prioritize worker safety around heavy machinery, which can be unpredictable during maintenance procedures.