Which of the following conditions is NOT monitored by the Load Moment Indicator (LMI)?

• A. Overload
• B. Wind speed
• C. Boom angle
• D. Radius

Answer: (B)

The Load Moment Indicator focuses on the crane’s loading configuration to keep the load moment within safe limits. It uses sensors for boom angle, which tells you the crane’s geometry; radius, which is the distance from the crane’s rotation point to the load; and load weight, to compute the actual moment. By constantly comparing this real-time moment to the rated capacity for the current configuration, the LMI can warn or halt lifting before the risk of tipping or overload occurs. Because of this, overload, boom angle, and radius are central to what the LMI tracks.

Wind speed, while important for overall crane operation and safety, is not a core part of the LMI’s calculations. It’s typically handled by separate wind-monitoring devices or operator guidelines, not by the LMI’s moment calculations. Therefore, wind speed is not monitored by the LMI.