A boom angle indicator does not show what?

• A. Boom deflection
• B. Boom extension
• C. Boom angle
• D. Boom height

Answer: (A)

A boom angle indicator is designed to display the angle of the boom relative to the ground, which you use to apply the load chart and keep the lift within safe limits. It does not measure how much the boom deflects or bends under load—that kind of information comes from a different sensor or indicator. Similarly, extension (how far the boom extends) and height are not read from the angle indicator; those readings come from separate indicators or are inferred from other measurements. So the indicator’s job is to show angle, not deflection.