Communication, Signal Systems and Teamwork
Communication is a control
Effective communication is a primary administrative control for boom operations. Establish a clear chain: the operator, the pump operator, the placing crew, the spotter, and the dogger or signal person. Agree on the signal system before the pour - hand signals, radio, or a combination. Radios must be tested and have a backup channel or method. Use a dedicated spotter when the operator's view is obstructed.
Signal protocols
Standard hand signals should be known and used consistently. The emergency stop signal must be unmistakable and understood by all. Verbal commands over radio should be short, clear and acknowledged - use a call-and-response protocol ("Slew left, slow" - "Slew left, slow, acknowledged"). If communication fails, stop the boom.
Teamwork and traps in exam questions
Questions often test whether the operator may act on a signal from anyone other than the designated signal person - generally no, except for an emergency stop, which anyone may give. Another trap is assuming a radio is sufficient when line of sight is blocked; a spotter is still required. Also, the operator must not rely on a worker standing under the boom to guide it.
Rule of thumb
"One voice, one signal, acknowledged." If the message is unclear, stop and confirm. Never guess a movement.