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

The heel pins are not considered a part of the boom structure itself; rather, they serve as attachment points for the boom to connect to the crane's superstructure or base. The boom is comprised of structural components designed to support the load while extended and typically includes lacing, cords, and cross members that contribute to its strength, stability, and ability to withstand various forces. Lacing provides additional support and helps maintain the structural integrity of the boom, while cords typically refer to the wire ropes or cables that assist in the operation of the boom. Cross members are structural elements that add rigidity and distribute the load across the boom. Each of these components is essential for the boom's performance during lifting operations. In contrast, heel pins, while important for the overall crane assembly and functionality, do not contribute to the structural configuration of the boom itself, thus making them the correct answer to the question of which component is not part of the boom.