Hand Signals & Communication Protocols Flashcards

During a critical lift, the designated signal person becomes temporarily unavailable. A qualified rigger who is NOT the designated signal person observes the load drifting toward a power line. What is the ONLY signal this rigger is authorized to give?

Answer: The STOP signal, because any worker may give an emergency stop

Per ASME B30.5 and OSHA 29 CFR 1926.1419, only the designated signal person may give signals to the crane operator — with one universal exception: ANY worker on the jobsite may give the STOP signal (or Emergency Stop) if they observe an unsafe condition. This is a safety override built into the standard. The rigger must give STOP, not attempt to direct the load or continue the lift.

A signal person is using radio communication and loses contact mid-lift due to a dead battery. According to ASME B30.5 protocol, what must the operator do IMMEDIATELY upon losing radio contact?

Answer: Stop all crane motion and not resume until communication is re-established

ASME B30.5 requires that when the established communication method fails, the operator must stop all crane motion immediately. The operator may NOT independently switch to an alternate method (such as hand signals) without a pre-established contingency plan agreed upon before the lift began. Continuing any motion — including completing a cycle — is a violation.

A signal person gives the 'hoist' hand signal, but the load is already at the maximum radius for the current boom configuration. The operator recognizes this would exceed the rated capacity. What is the operator's correct course of action?

Answer: Refuse the signal and stop all operations until the condition is resolved

The crane operator has the ultimate authority and responsibility to refuse any signal that would result in an unsafe operation or exceed rated capacity. This is explicitly stated in ASME B30.5 and OSHA 1926.1417. The signal person directs motion; the operator is never relieved of responsibility for safe operation. Hoisting to 'reduce radius effect' is a misconception — radius changes with boom angle, not hoist position alone.

During a tandem lift with two cranes and two separate signal persons, Crane A's signal person gives a 'boom down' signal at the same moment Crane B's signal person gives a 'hold' signal. What is the correct protocol for both operators?

Answer: Both operators stop immediately — conflicting signals default to STOP

In a tandem or multiple-crane lift, a single lift director (or appointed signal person) must coordinate all crane movements. Conflicting simultaneous signals from separate signal persons indicate a breakdown in coordination — both operators must stop all motion. This prevents load sharing ratios from shifting unexpectedly, which is the primary catastrophic risk in tandem lifts. The scenario itself represents a procedural failure that must be halted.

A signal person certified for hand signal communication is working in conditions where the operator cannot maintain continuous visual contact due to a structural obstruction. The signal person proposes using a mirror-relay system through an intermediate worker. Under ASME B30.5, this arrangement is:

Answer: Acceptable only if the relay worker is also a qualified signal person

ASME B30.5 permits relay signaling only when each person in the relay chain is a qualified signal person. An unqualified 'intermediate worker' passing signals introduces an unqualified person into the communication chain, which is prohibited. If line-of-sight cannot be maintained and no qualified relay is available, the signal person must use an alternative communication method (radio/telephone) per a pre-planned contingency.

An operator is conducting a pick-and-carry operation on a rough-terrain crane. The designated signal person is walking ahead of the crane and uses the 'travel' (both fists rotating in front of the body) hand signal. The operator notices the ground slopes laterally by approximately 5 degrees. What is the proper response?

Answer: Stop all travel until the operator personally assesses the slope against the crane's pick-and-carry chart

For pick-and-carry operations, the operator must verify that operating conditions — including ground slope — fall within the limits specified on the crane's load chart for pick-and-carry. The signal person directs travel direction, NOT the operator's compliance with machine limitations. Lateral slopes are particularly hazardous during pick-and-carry because they affect tipping axis. The operator must stop and verify chart allowances independently before proceeding.