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

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What action does a signal person intend the operator to perform if he extends his arm at shoulder height, makes a fist with his hand, and sticks his/her thumb up?

  1. Boom down

  2. Swing

  3. Boom up

  4. Extend boom

The correct answer is: Boom up

When a signal person extends their arm at shoulder height, makes a fist, and indicates a thumb up, this gesture is a standardized signal that communicates a specific action for the operator to perform. In this case, it signals the operator to raise or "boom up" the crane's arm. The positioning of the arm and the fist with the thumb pointing upwards specifically conveys the intention for increasing the height of the boom or lifting load. This is consistent with the widely recognized hand signals in construction and crane operation. Understanding these signals is crucial as they ensure effective communication between the signal person and the operator, enhancing safety and efficiency on the job site.

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