Which signal is used to lower the boom?

• A. The signal for lower boom
• B. The signal for move slow
• C. The signal for hoist
• D. The signal for boom up

Answer: (A)

In crane signaling, there is a distinct gesture that communicates bringing the boom down. This signal is specifically understood to instruct the operator to lower the boom, which is a different action from moving the load, raising the boom, or simply changing speed. Using the dedicated “lower the boom” signal ensures the operator executes the correct movement without confusion. The other signals correspond to other commands—slowing down, hoisting the load, or raising the boom—so they would not accomplish the intended action of lowering the boom.