Communication, Signals and Teamwork
One voice, clear signals
Lifting is a team task. Designate a single signalperson and ensure everyone knows who is directing the lift. Use the standard hand and whistle signals consistently, and confirm radio channels and backup methods before the lift. Traps include multiple people giving signals, a signalperson out of the operator's view, and assuming a radio is working without a test call.
Radio and blind lifts
For blind lifts, use a relay or agreed positioning so the operator always has a clear instruction path. Use distinctive words - "hoist", "lower", "stop", "slew left/right" - and require acknowledgement. An emergency stop signal from anyone must be obeyed immediately, regardless of who gave it.
Team roles
Riggers confirm slinging and load security; the signalperson directs; the operator controls the crane; the supervisor manages the lift plan and exclusion zone. Clear role boundaries prevent conflicting instructions.
Pre-lift briefing
Brief the team on the load mass, path, signals, exclusion zone and emergency plan. Confirm everyone can see or hear the signal source.
Worked rule of thumb
Use "test, confirm, acknowledge": test the radio, confirm the signalperson, and require acknowledgement of each critical command. If communication fails, stop the lift and lower the load safely.