Sep 10 (edited) • Communication Failures
Two Slingers Giving Instructions to One Crane Operator
During a blind tower crane lift, one Slinger/Signaller was controlling the load using commands by radio.
As the load approached the landing area, a second slinger saw that it was getting close to an obstruction and started giving the operator instructions at the same time.
The operator suddenly received:
Slinger 1: “Slew right slowly.”
Slinger 2: “Stop. come left!”
For several seconds, the operator did not know whose instruction had priority.
The operation was stopped before contact occurred.
What Went Wrong
- Two people attempted to control the same crane movement.
- No clearly identified lead signaller.
- Conflicting radio instructions were transmitted.
- The operator was forced to decide which instruction to follow.
- The communication arrangement had not been properly briefed.
Key Lessons Learned
For a crane movement, the operator should normally be receiving directions from one designated Slinger/Signaller at a time.
If control needs to transfer between signallers during a blind lift, the handover must be positive and understood.
For example:
Slinger 1: “TC1, stop. Slinger 2 will now take control.”
Operator: “TC1 stopped. Slinger 2 taking control confirmed.”
Only then should the next movement begin.
Emergency STOP instructions are different, a stop warning must never be ignored simply because it came from someone else.
Safety Recommendations
- Nominate the controlling Slinger/Signaller.
- Agree call signs before lifting.
- Use positive radio handovers.
- Never give competing crane instructions.
- Keep radio channels clear.
- If instructions conflict. STOP.
- Re-establish who has control before continuing.
Regulatory Mapping
● LOLER Reg. 8 – Proper planning, supervision and safe execution.
● PUWER Reg. 9 – Adequate training and instruction.
● BS 7121 principles – Clear signalling and communication during lifting operations.
Key Point
Two voices should never fight for control of one crane.
One operator.
One movement.
One clearly identified signaller.
And if communication becomes confused:
STOP. CLARIFY. CONTINUE.
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Two Slingers Giving Instructions to One Crane Operator
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