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

What should an operator do if a crane's load moment indicator (LMI) malfunctions?

1. Cease crane operations and report the condition to the supervisor

2. Turn it off and continue as if the LMI were not installed

3. Make mathematical allowances for any error

4. Attempt to repair the fault

The correct answer is: Cease crane operations and report the condition to the supervisor

When a crane's load moment indicator (LMI) malfunctions, the correct course of action is to cease crane operations and report the condition to the supervisor. The LMI is a crucial safety feature that provides real-time feedback on the load being lifted in relation to the crane's capacity. If it is not functioning correctly, the operator cannot reliably determine whether the crane is operating within safe limits, which poses a significant risk of overload and potential accidents. By stopping operations, the operator ensures that no further risks are introduced while the issue is being assessed. Reporting the malfunction to a supervisor initiates the appropriate procedures for investigating and addressing the problem. This approach prioritizes safety and compliance with regulations that govern crane operations. Other actions, such as attempting to repair the fault on-site without proper authorization or training, can introduce additional hazards. Continuing operations without a functional LMI disregards the safety protocols and compromises the operator's ability to prevent overload and maintain safe lifting practices. Making mathematical allowances for any error similarly assumes a level of certainty that cannot be guaranteed when a safety feature is malfunctioning. Therefore, the safest and most responsible action is to halt operations and report the malfunction so that it can be properly evaluated and repaired.