Why is a boom length indicator needed when lifting a man basket?

Why is a boom length indicator needed when lifting a man basket?

• A. To determine safe crane capacity at the given reach
• B. To measure wind speed
• C. To ensure aesthetic alignment
• D. To track operator hours

Answer: (A)

Knowing the boom length lets you read the crane’s load chart for the exact configuration in use. The crane’s capacity decreases as the reach increases; a longer boom places the load farther from the crane’s base, increasing the moment and the risk of tipping. The boom length indicator provides real-time data so you can verify the weight of the man basket (including personnel and tools) is within what the chart allows at that reach and boom angle. This is crucial for safe lifting of people, where exceeding capacity can lead to serious accidents. Wind speed and visibility aren’t determined by the boom length indicator, so that’s not its purpose. Aesthetic alignment and tracking operator hours aren’t related to lifting capacity either.

Knowing the boom length lets you read the crane’s load chart for the exact configuration in use. The crane’s capacity decreases as the reach increases; a longer boom places the load farther from the crane’s base, increasing the moment and the risk of tipping. The boom length indicator provides real-time data so you can verify the weight of the man basket (including personnel and tools) is within what the chart allows at that reach and boom angle. This is crucial for safe lifting of people, where exceeding capacity can lead to serious accidents.

Wind speed and visibility aren’t determined by the boom length indicator, so that’s not its purpose. Aesthetic alignment and tracking operator hours aren’t related to lifting capacity either.