If an LMI fails, what is the proper procedure?

• A. Continue using the LMI
• B. Use the load chart and the boom angle unless not allowed by the manufacturer
• C. Stop operation and replace the LMI immediately
• D. Rely on the operator's experience

Answer: (B)

When the LMI isn’t functioning, you lose the automatic safety check it provides for lifting capacity. The safe path is to rely on the crane’s load chart for the exact configuration and use the current boom angle to determine the allowable load. If the manufacturer permits operating with the LMI out of service using those charts, proceed by comparing the intended lift to the chart’s limits and stay within them. If the manufacturer requires stopping and replacing or repairing the LMI, follow that instruction. Relying on operator guesswork or continuing with the LMI inoperative without referencing the chart isn’t safe, so the chart-and-angle method is the correct, approved fallback.