Incident involving a crane boom
We have received a report of an incident whereby a crane boom fell from an angle of 45° onto its rest. There was no one in the crane at the time of the incident, but one person on the main deck was slightly hurt by the debris as the crane boom fell. The crane suffered significant damage to the boom, luffing winch, brake and hydraulic motor and the potential for serious injury is obvious.
No root cause has so far been identified and an investigation is still ongoing. Initial investigations suggest that, although the crane was left parked in a properly parked mode, both winch drum brakes and the safety pawl all stayed off or partially off when the crane was de-energised, when they should all have engaged. Three co-incidental failures seem extremely unusual and investigations are currently centred on whether the hydraulic system could have somehow locked pressure in to keep all the brakes off.
Safety Event
Published: 2 August 2003
Download: 
IMCA SF 10/03
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