Lost time injury (LTI): Dropped object incident

The incident occurred whilst members of the crew were using a chain block/tackle assembly on a H-beam, to assist with manoeuvring the heavy lids to the chain lockers which were located on a mezzanine deck. As chain locker lids are too heavy to move manually, two months previously, an H-beam had been installed in this location to permit the use of a chain assembly/trolley.

One of the persons conducting the work manually pulled the chain aside; momentum caused the trolley for the chain block assembly to run along the H-beam track. There was no end stopper and the trolley fell off the H-beam. It fell approximately 1.2 meters, glancing off the injured person’s helmet and landing on deck. The total weight of the trolley and chain block assembly was approximately 33 kg. The injured person walked off the job unaided, and was attended by the onboard medic. The initial prognosis was a fractured neck. A neck brace was applied and then the injured party was medivaced by helicopter.

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Our Member’s initial investigation noted the following immediate causes:

• There was no ‘trolley stopper’, or similar device, on the H-beam, to prevent chain assembly/trolley from falling off the end of the beam.
  
  
• The injured person was working under a unsecured load and ostensibly unaware of the consequences of pulling the chain assembly along H-beam when there was no trolley stopper.
  
  
• The injured person disconnected the chain from chain locker lid.

Our Member noted the following root causes to the incident:

• Organisation
  
  
  • Although there were four persons working on the particular job, there was a lack of supervision, as work instructions were not followed.
    
    
  • Work equipment was allowed to be used, despite being known and identified as ‘faulty’. The day before the incident it had been reported that there was no ‘trolley stopper’ on the retrofitted H-beam. No action was taken to address this very serious omission.
    
    
  • The potential of falling objects was not recognised or identified as a foreseeable and significant risk. . People -Work instructions were not followed. The injured person disconnected chain from chain locker lid; this was not a specified work instruction within documentation, nor instruction from the lead AB. The injured person appeared to have been working from his own initiative in undertaking this action. . Environment -There was a lack of situational awareness. The injured person and his colleagues, whilst familiar with the generic activity of opening chain locker doors, were not familiar with the new H-beam and the overhead chain assembly tool and this may have contributed to the incident occurring. It was noted that this was the first time the H-beam/chain assembly tool arrangement had been used at this worksite.