Hand Signals & Communication
2 hours
Learning Objectives
- •Demonstrate the standard hand signals required by 230 CMR 6.00 for crane operations
- •State when a signal person must be used under OSHA 1926.1419
- •Explain the hierarchy of stop signals and why emergency stop overrides everything
- •Describe the requirements for radio communication as an alternative to hand signals under OSHA 1926.1420
Topics Covered
- •230 CMR 6.00: only an approved signaler may direct crane operator movements in Massachusetts
- •SAE J1307: the hand signal standard referenced by 230 CMR 6.00 for cranes covered by the 1B restriction
- •OSHA 1926 Subpart CC Appendix A: standard hand signals for cranes (parallel requirement)
- •OSHA 1926.1419: when a signal person is required — blocked view of point of operation, obstructed travel, site safety concerns
- •One person gives signals at a time: only one designated signal person may direct the operator
- •Emergency stop signal: any person on site may give it; operator must obey immediately
- •Standard hand signals for crane operations: hoist up, lower, swing left/right, extend/retract boom, stop, emergency stop, travel, dog everything
- •Lost visual contact: if operator cannot see the signaler, all movement must stop immediately
- •Radio communication (OSHA 1926.1420): dedicated channel, hands-free receiver for operator, tested on site before operations begin
- •Conflicting signals: if signals conflict, operator must stop and resolve before continuing; emergency stop from either party always prevails
- •Non-standard signals: allowed when pre-agreed upon and operator understands meaning; but standard signals are always safer
Resources
Self-Check Questions
Question 1: Under 230 CMR 6.00, who is authorized to direct a crane operator's movements on a Massachusetts job site?
- A. The general contractor's project manager
- B. Any employee present in the work area
- C. Only the approved signaler assigned to the crane(correct)
- D. The operator may take direction from any licensed engineer on the project
Show Explanation
Explanation:
230 CMR 6.00 requires that only an approved signaler direct crane operator movements. Taking direction from anyone else — even a project manager or engineer — violates the regulation and creates conditions where conflicting or unauthorized signals can cause accidents.
Question 2: Under OSHA 1926.1419, when MUST a signal person be used?
- A. Only when the load exceeds 50% of rated capacity
- B. Only when the crane is traveling on tires with a load
- C. When the point of operation is not in full view of the operator, when travel view is obstructed, or when site safety concerns require it(correct)
- D. Whenever the boom is extended beyond 60 feet
Show Explanation
Explanation:
OSHA 1926.1419 requires a signal person when: (1) the operator cannot see the point of operation or load travel, (2) travel direction is obstructed, or (3) the operator or person handling the load determines a signal person is needed for site safety. These are minimum triggers — prudent operators use signalers whenever visibility is imperfect.
Question 3: During a crane pick, a worker on the ground (not the designated signaler) crosses their arms overhead in an emergency stop signal. What must the operator do?
- A. Ignore the signal — only the designated signaler can give a valid stop signal
- B. Check with the signaler to confirm the stop before halting operations
- C. Stop all crane movement immediately — any person may give an emergency stop signal(correct)
- D. Slow down gradually to avoid shock loading the rigging
Show Explanation
Explanation:
OSHA 1926.1419 states that while only one person gives directional signals at a time, any person on site who becomes aware of a safety problem may give a stop or emergency stop signal — and the operator must obey it immediately. An emergency stop is not optional regardless of its source.
Question 4: You are using radio communication instead of hand signals. Under OSHA 1926.1420, what does the operator's radio receiver system require?
- A. A loudspeaker inside the cab so the crew outside can confirm transmissions
- B. A dedicated channel and a hands-free receiver so the operator's hands are never occupied by the radio(correct)
- C. A second radio operator in the cab to relay signals from ground to boom
- D. Voice confirmation from the signal person repeated twice before any movement begins
Show Explanation
Explanation:
OSHA 1926.1420 requires that when radio is used, the transmission is on a dedicated channel and the operator's reception is by a hands-free system. The operator's hands must remain available for crane controls — holding a radio handset during a pick is a prohibited distraction.
Question 5: The designated signaler steps behind a concrete barrier and you can no longer see them. What must you do?
- A. Use the last signal received and complete the movement slowly
- B. Stop all crane movement until visual contact with the signaler is restored or an alternate signal method is established(correct)
- C. Switch to radio communication immediately and continue the lift
- D. Ask a nearby worker to relay signals from the signaler
Show Explanation
Explanation:
230 CMR 6.00 and OSHA 1926.1419 both require the operator to stop if visual contact with the signaler is lost. A relay system using bystanders is not an approved signal method. Stop, verify why contact was lost, and re-establish a proper signal arrangement before resuming any crane movement.
Question 6: Which SAE standard is referenced by 230 CMR 6.00 for hand signals on crane operations covered by the 1B restriction?
- A. SAE J386
- B. SAE J765
- C. SAE J1307(correct)
- D. SAE J320a
Show Explanation
Explanation:
SAE J1307 is the hand signal standard referenced by 230 CMR 6.00 for crane operations. SAE J386 covers seat belts, J765 is the crane stability test code, and J320a covers ROPS for off-road machines. Knowing which standard applies to which equipment type is a common exam topic.