Hand Signals & Communication Protocols Flashcards

During a critical pick, a journeyman ironworker (not the designated signal person) notices the load is about to strike a worker and shouts 'Emergency Stop!' while giving the emergency stop hand signal. The operator is also receiving conflicting signals from the designated signal person to continue hoisting. What is the correct action?

Answer: Stop immediately, because the emergency stop signal may be given by anyone on the jobsite

Per ASME B30.5, the emergency stop signal is the one exception to the rule that operators follow only the designated signal person — it may be given by ANYONE, and the operator must obey it immediately. All other signals are only valid from the designated signal person, but emergency stop supersedes this restriction to protect life safety.

A signal person gives the 'Use Whipline (Auxiliary Hoist)' hand signal by tapping their elbow. Immediately afterward, they give the 'Hoist' signal. The operator, however, believes the load rigging is attached to the main hoist line. According to ASME B30.5 communication protocol, what should the operator do?

Answer: Give the 'Dog Everything' signal and verify which hoist line is rigged before proceeding

When the operator has reasonable doubt about the safety or intent of a signal — including uncertainty about which hoist line is actually rigged — ASME B30.5 requires the operator to stop (Dog Everything) and resolve the discrepancy before proceeding. Blindly following a signal that conflicts with direct observation could cause a catastrophic failure.

Two cranes are performing a tandem lift. Signal person Alpha is communicating with Crane A's operator, and signal person Beta is communicating with Crane B's operator. Mid-lift, signal person Alpha wants to instruct Crane B to hold position. What is the correct communication protocol?

Answer: Signal person Alpha must relay the instruction through signal person Beta, who then signals Crane B's operator

In tandem lift operations, each crane operator takes signals only from their designated signal person. Signal person Alpha cannot signal Crane B's operator directly — the instruction must be relayed to signal person Beta, who then communicates it to Crane B's operator. Maintaining clear lines of authority prevents conflicting commands during complex multi-crane lifts.

When operating a telescoping boom crane, the signal person gives 'Extend Boom' by presenting both fists in front of the body with thumbs pointing outward. The operator correctly extends the boom. Shortly after, the signal person wants to indicate 'Extend Boom Slowly.' How is this modification correctly communicated per standard hand signal protocol?

Answer: The signal person places one hand motionless in front of the hand giving the extend signal

The 'Move Slowly' modifier per ASME B30.5 is applied by placing one hand motionless in front of the hand giving the primary signal. This modifier can be applied to any standard signal to indicate the movement should be performed at reduced speed. It is not function-specific and works with telescoping, hoisting, swinging, and other movements.

An operator is performing a pick in a congested area using radio communication as the primary signaling method. The signal person's radio battery dies mid-lift with the load suspended. The signal person switches to hand signals. Under ASME B30.5, what is the operator's required response?

Answer: Stop all crane movement and dog everything until communication is formally re-established per the lift plan

When the pre-planned primary communication method (radio) fails mid-lift, the operator must stop all movement and dog everything. Switching communication methods mid-operation requires that the change be deliberate, acknowledged, and controlled — not improvised. The lift plan must account for backup communication, and the operator cannot unilaterally switch methods without a controlled halt. ASME B30.5 requires communication continuity, not improvised substitution.

A signal person is stationed where they can see the load but cannot maintain constant eye contact with the operator. The operator can see the signal person. Under ASME B30.5, which statement best describes the validity of this signaling arrangement?

Answer: The arrangement is invalid because the signal person must maintain eye contact with both the load AND the operator simultaneously at all times

ASME B30.5 requires that the signal person be in a position where they can see the load (or the hook/block if the load is not yet attached) AND maintain communication with the operator. If the signal person cannot see the operator to confirm signals are being received and understood, the communication loop is broken. Mutual visibility — or a relay system — is required. The operator seeing the signal person is necessary but not sufficient; the signal person must also be able to observe operator acknowledgment.