Hand Signals & Communication Protocols Flashcards

During a critical lift, the crane operator loses visual contact with the signal person mid-cycle. According to ASME B30.5 and OSHA 1926.1419, what is the ONLY condition under which the operator may continue the load movement?

Answer: If a second qualified signal person with an unobstructed view assumes signaling duties and the operator acknowledges the transfer

ASME B30.5 and OWASP 1926.1419 require the operator to stop all movement when the signal person is out of sight, unless a qualified replacement signal person with unobstructed view takes over and the operator acknowledges the transfer. Radio authorization by a lift director does not substitute for a qualified signal person with visual line-of-sight, and the operator's own assessment of the path is not a compliant substitute.

A signal person gives the 'hoist' hand signal, then immediately transitions to a 'dog everything' signal. The operator hoists two feet before seeing the 'dog everything.' Which statement is MOST accurate regarding the operator's responsibility?

Answer: The operator must stop immediately upon seeing 'dog everything,' regardless of load position

The 'dog everything' (stop all motion) signal supersedes any prior signal the instant it is observed. The operator must cease all motion immediately upon seeing it, with no exceptions for cycle completion. The rationale that stopping causes load swing does not override the emergency-stop authority of the signal person — operators are trained to manage controlled stops safely.

When using a radio communication system instead of hand signals for crane operations, which OSHA 1926.1419 requirement specifically applies to preventing miscommunication?

Answer: Signals must be given in plain language with distinct start and stop commands, and the operator must acknowledge each signal before acting

OSHA 1926.1419(d) requires that when alternative communication methods (including radio) are used, signals must be given in plain language, must include distinct start and stop commands, and the operator must acknowledge receipt before executing. Verbatim repeat-back and numeric codes are not OSHA-mandated requirements, and a backup hand-signal person is not required when radio is the designated communication method.

An operator is working with a signal person who is certified by a third-party accrediting organization but whose certification has lapsed by 14 days. Under OSHA 1926.1428, what is the CORRECT course of action?

Answer: The signal person must immediately stop signaling; an expired certification provides no OSHA-compliant qualification

OSHA 1926.1428 does not provide a grace period for lapsed signal person certifications. An expired certification means the signal person no longer meets the qualification requirements and must stop performing signaling duties immediately. There are no OSHA provisions for temporary employer-issued qualification letters, grace periods, or lift-type exceptions for lapsed certifications.

During a tandem lift coordinated by two cranes, Crane A's operator receives a 'stop' hand signal from the signal person, but Crane B's operator does not see the signal and continues hoisting. According to best practice and ASME B30.5 tandem lift protocols, what should happen NEXT?

Answer: Crane A's operator must hold position; the lift director must immediately halt Crane B via the communication system before either crane moves

In tandem lifts, any stop signal must result in all cranes stopping. Crane A's operator must hold position after receiving 'stop' — resuming to match Crane B would compound the hazard. The lift director, as the designated coordinator for tandem operations, bears responsibility for halting Crane B via the pre-established communication system. Having Crane A lower or relying on horn signals are not compliant responses and could create dangerous load dynamics.

A qualified signal person is stationed at ground level and cannot see the hook because of an intermediate floor obstruction. They can see the rigger at the pick point via radio, and the rigger calls out load status. Under OSHA 1926.1419, this arrangement is:

Answer: Non-compliant, because the signal person must have direct visual contact with the load, hook, and crane at all times

OSHA 1926.1419(a) requires that the signal person must be in a position to directly observe the load and the crane's movement at all times. Relay arrangements through an intermediary — even a qualified rigger — do not satisfy this direct-observation requirement. There is no OSHA provision for relay-observer exceptions based on lift type, written approval, or secondary qualification of the relay person.